JP2019120146A - Electric motor assembly, pump device, and method for identifying abnormal vibration of electric motor assembly - Google Patents

Abstract

To provide an electric motor assembly that can identify abnormal vibration of a component.SOLUTION: An electric motor assembly 100 comprises a motor 3, an inverter 22 that is variable speed means for the motor 3, and a control device 23 for controlling the motor 3. The electric motor assembly 100 comprises a first bearing 21 arranged on an anti-load side of the motor 3 and rotatably supporting a driving shaft 2 for the motor 3, and a second bearing 25 arranged on a load side of the motor 3 and rotatably supporting the driving shaft 2, and comprises a first motor side vibration sensor 31 for detecting vibration of the first bearing 21, a second motor side vibration sensor 35 for detecting vibration of the second bearing 25, and an inverter side vibration sensor 36 for detecting vibration of the inverter 22. The control device 23 detects abnormal vibration on the basis of respective values detected by the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor assembly, a pump device, and a method of identifying abnormal vibration of the motor assembly.

  There is known an electric motor assembly integrally including an electric motor which is a driving machine of a rotary machine such as a pump and an inverter which is variable speed means of the electric motor. The drive shaft of the motor in such a motor assembly is a rotating body rotating at high speed, and there is a possibility that the vibration of the rotary machine is transmitted to each component of the motor assembly including the inverter via the drive shaft.

  The motor assembly is a device applicable to a device for supporting the lifeline (for example, a water supply pump). In the worst case, if abnormal vibration occurs in the pump device combining the motor assembly and the pump, the pump can not be operated in the worst case, and it is seriously affected by the living environment such as tap water overflow or drainage overflow. There is a fear. Therefore, vibration control of such a pump device is an important factor.

JP, 2008-131713, A JP, 2015-231295, A JP 2001-305510 A Japanese Patent Application Laid-Open No. 55-101705

  The inverter comprises various electronic components. For example, the inverter is provided with a component such as an electrolytic capacitor, which has a high center of gravity and is susceptible to vibration. Therefore, if the inverter is affected by the abnormal vibration, it may be broken and the operation of the rotary machine may be hindered.

  In addition, the vibration generated in the motor assembly is a factor that is dependent on the installation environment and usage of the motor assembly. In particular, in the pump device, the generated vibrations also differ depending on mechanical and electrical elements such as the bore diameter and output of the pump, the head and flow rate, and the use environment such as the type of carrier liquid. Whether or not to stop the rotating machine due to abnormal vibration depends on the configuration of the motor assembly and the operating environment, and even if it is a slight vibration, it may be stopped, and operation will be continued as much as possible even in the presence of vibration. I also want to do something.

  In order to determine whether to stop the rotating machine due to abnormal vibration, it is necessary to identify the component of the motor assembly in which the abnormality has occurred. In addition, when stopping the motor assembly due to the cause of the abnormal vibration, it is possible to identify the components of the motor assembly in which the abnormality has occurred and promptly take measures to eliminate the abnormal vibration, such as component replacement. Desired.

  Therefore, the present invention aims to provide a motor assembly capable of identifying abnormal vibration of a component, a pump device provided with the motor, and a method of identifying abnormal vibration of a component of the motor assembly. I assume.

One aspect is a motor assembly comprising a motor, an inverter that is variable speed means of the motor, and a control device that controls the motor, wherein the motor assembly is a non-load side of the motor And a second bearing disposed on the load side of the motor and rotatably supporting the drive shaft. A first motor-side vibration sensor for detecting the vibration of one bearing, a second motor-side vibration sensor for detecting the vibration of the second bearing, and an inverter-side vibration sensor for detecting the vibration of the inverter The control device detects abnormal vibration on the basis of values detected by the first motor-side vibration sensor, the second motor-side vibration sensor, and the inverter-side vibration sensor.
According to the above aspect, the control device can identify abnormal vibration of components of the motor assembly.

In a preferable aspect, the control device calculates and measures the vibration level for each frequency band of each value detected by the first motor side vibration sensor, the second motor side vibration sensor, and the inverter side vibration sensor. It has at least one predetermined threshold value stored in the storage unit as a vibration value and compared with at least one of the vibration levels, and the vibration level of the measured vibration value is less than or equal to the first threshold value State, wherein the vibration level of the measured vibration value is greater than the threshold value is the second state, and the control device detects abnormal vibration when at least one of the vibration levels is the second state And identifying the cause of the abnormal vibration based on the measured vibration value.
According to the above aspect, the control device can identify the cause of the abnormal vibration of the component of the motor assembly, so that the operator can promptly take measures to eliminate the abnormal vibration, such as component replacement. Can.

In a preferred aspect, the inverter-side vibration sensor is in the first state, the first motor-side vibration sensor is in the second state, and the second motor-side vibration sensor is in the second state. When the frequency band in the abnormal vibration detected by the motor-side vibration sensor and the second motor-side vibration sensor is the same, it is determined that an abnormality occurs in the drive shaft.
According to the above aspect, since the control device can determine that an abnormality occurs in the drive shaft, the operator can quickly replace the drive shaft.

In a preferred aspect, in the control device, the inverter-side vibration sensor is in the first state, the first motor-side vibration sensor is in the second state, and the second motor-side vibration sensor is in the first state. It is determined that an abnormality has occurred in the first bearing, the inverter-side vibration sensor is in the first state, the first motor-side vibration sensor is in the first state, and the second motor-side vibration When the sensor is in the second state, it is determined that an abnormality has occurred in the second bearing.
According to the above aspect, since the control device can identify the abnormality occurring in the first bearing and the abnormality occurring in the second bearing, the operator can replace the bearing in which the abnormality has occurred. Can be done quickly.

In a preferable aspect, in the control device, the inverter-side vibration sensor is in the second state, the first motor-side vibration sensor is in the first state, and the second motor-side vibration sensor is in the first state. And determining that an abnormality has occurred in an inverter unit including the inverter.
According to the above aspect, the control device can determine that an abnormality has occurred in the inverter unit.

In a preferable aspect, in the control device, the inverter-side vibration sensor is in the second state, the first motor-side vibration sensor is in the second state, and the second motor-side vibration sensor is in the second state. In the case of the state, it is determined that an abnormality has occurred in the housing of the motor assembly.
According to the above aspect, the control device can determine that an abnormality has occurred in the entire housing of the motor assembly, that is, the motor casing and the inverter housing.

In a preferable aspect, in the control device, the inverter-side vibration sensor is in the second state, the first motor-side vibration sensor is in the first state, and the second motor-side vibration sensor is in the first state. In the case of the state, the operation of the motor is continued while issuing an alarm.
According to the above aspect, the control device can continue the operation of the motor, and the operator can quickly detect an abnormality in the inverter unit.

In a preferred aspect, the storage unit includes a storage table for storing the measured vibration value at each stage in which the rotational speed of the motor is increased stepwise to a predetermined rotational speed, and the control device performs test operation. The measured vibration value at each stage where the rotational speed of the motor is increased stepwise to a predetermined rotational speed is stored as a test measured vibration value in a storage table, and a numerical value indicating a predetermined ratio is added to the test measured vibration value. Alternatively, the threshold value is determined by multiplication or any one of the average value, the maximum value or the minimum value of the test measurement vibration values is calculated as a representative value, and the representative value is added or multiplied by a predetermined value. To determine the threshold value, or to calculate a correction amount which is a difference between the test measurement vibration value and a predetermined reference vibration value, and to determine the threshold value based on the calculated correction amount. Is characterized by .
According to the above aspect, it is possible to determine the threshold value that matches the individual differences of the motor assembly and the like. In addition, since the determined threshold value is determined with a width relatively, the controller can more reliably identify the cause of the abnormal vibration of the component of the motor assembly.

In a preferred aspect, the threshold value includes a first threshold value and a second threshold value larger than the first threshold value, and the control device includes the first motor-side vibration sensor. The operation of the motor may be stopped if at least one of the measured vibration values of the second motor-side vibration sensor and the inverter-side vibration sensor is equal to or greater than the second threshold.
According to the above aspect, the control device can stop the operation of the motor with excessive vibration. On the other hand, if it is less than the second threshold, the operation can be continued while detecting the vibration abnormality, so that the operator can quickly find the abnormal vibration of the component of the motor assembly.

In a preferred aspect, the motor assembly includes a motor casing having a first bearing support that houses the motor and supports the first bearing and a second bearing support that supports the second bearing; and the inverter And an inverter housing for containing the first motor side vibration sensor, the first motor side vibration sensor being attached to the first bearing support portion, and the second motor side vibration sensor being attached to the second bearing support portion The inverter-side vibration sensor is mounted on an inner surface of the inverter or the inverter housing.
According to the above aspect, the first motor-side vibration sensor can more reliably detect the abnormal vibration of the first bearing, and the second motor-side vibration sensor can more reliably detect the abnormal vibration of the second bearing Thus, the inverter-side vibration sensor can more reliably detect abnormal vibration of the inverter unit.

A preferred embodiment is characterized in that the drive shaft passes through a through hole of the inverter.
According to the above aspect, since the influence of the vibration of the drive shaft in the inverter unit can be reduced, the control device can identify the cause of the abnormal vibration of the inverter unit.
A preferred embodiment is characterized in that the control device executes a vibration suppressing motion that changes the rotational speed of the motor by detecting the abnormal vibration.
According to the above aspect, the control device can identify the cause of the abnormal vibration of the pump.

  Another aspect is a pump device comprising a pump driven by the motor assembly.

Yet another aspect is a method of identifying abnormal vibration of a motor assembly comprising a motor and an inverter which is variable speed means of the motor, wherein the first bearing rotatably supports a drive shaft of the motor A first motor-side vibration sensor for detecting vibration, a second motor-side vibration sensor for detecting a vibration of a second bearing provided at the first bearing and the target position and rotatably supporting the drive shaft, and the inverter The abnormal vibration is specified based on each value detected by the inverter-side vibration sensor that detects the vibration of.
According to the above aspect, since the operator can identify the cause of the abnormal vibration of the component of the motor assembly, the worker can quickly take measures to eliminate the abnormal vibration, such as component replacement. Can.

In a preferable aspect, a vibration level for each frequency band of each value detected by the first motor-side vibration sensor, the second motor-side vibration sensor, and the inverter-side vibration sensor is calculated to be a measured vibration value. The first state where the vibration level of the measured vibration value is at least one predetermined threshold value to be compared with at least one of the vibration levels is a first state, and the state where the vibration level of the measured vibration value is greater than the threshold value In the second state, when at least one of the vibration levels is the second state, the abnormal vibration is specified, and the cause of the abnormal vibration is specified based on the measured vibration value.
According to the above aspect, since the operator can identify the cause of the abnormal vibration of the component of the motor assembly, the worker can quickly take measures to eliminate the abnormal vibration, such as component replacement. Can.

  The motor assembly includes a first motor-side vibration sensor, a second motor-side vibration sensor, and an inverter-side vibration sensor. Thus, the controller can identify the cause of the abnormal vibration of the components of the motor assembly. As a result, the operator can promptly take measures to eliminate abnormal vibration, such as component replacement.

FIG. 5 illustrates one embodiment of a motor assembly. It is a sectional view showing typically a pump device provided with a motor assembly, a pump, etc. It is a schematic diagram which shows the structure of a control apparatus. It is a schematic diagram of the pump installation provided with the pump apparatus. It is a figure which shows the operation | movement flowchart in test driving | running mode. It is a figure which shows an example of the memory | storage table which memorize | stores the measurement vibration value in a memory | storage part. It is a figure which shows the measurement vibration value in, when abnormality generate | occur | produces in a drive shaft. It is a figure which shows the flowchart which identifies the cause of the abnormal vibration of the component of the motor assembly by a control apparatus. It is a figure which shows the presence or absence of detection of abnormal vibration of the 1st motor side vibration sensor in FIG. 7, a 2nd motor side vibration sensor, and an inverter side vibration sensor. It is a figure which shows the measurement vibration value in, when abnormality generate | occur | produces in a bearing. It is a figure which shows the flowchart which identifies the cause of the abnormal vibration of the component of the motor assembly by a control apparatus. It is a figure which shows the presence or absence of detection of abnormal vibration of the 1st motor side vibration sensor in FIG. 10, a 2nd motor side vibration sensor, and an inverter side vibration sensor. It is a figure which shows the measurement vibration value in, when the abnormal vibration resulting from the abnormality of an inverter part has generate | occur | produced. It is a figure which shows the flowchart which identifies the cause of the abnormal vibration of the component of the motor assembly by a control apparatus. It is a figure which shows the presence or absence of detection of abnormal vibration of the 1st motor side vibration sensor in FIG. 13, the 2nd motor side vibration sensor, and the inverter side vibration sensor. It is a figure which shows the measurement vibration value in, when abnormality generate | occur | produces in the housing | casing of a motor assembly. It is a figure which shows the flowchart which identifies the cause of the abnormal vibration of the component of the motor assembly by a control apparatus. It is a figure which shows the presence or absence of detection of abnormal vibration of the 1st motor side vibration sensor in FIG. 16, the 2nd motor side vibration sensor, and the inverter side vibration sensor. FIG. 7 is a state transition diagram showing changes in the operating state of the motor assembly. It is a figure which shows the detection flowchart of the abnormal vibration of the motor assembly by a control apparatus. It is a figure which shows the flowchart of normal driving | operation. It is a figure which shows the flowchart of a 1st vibration suppression driving | operation. It is a figure which shows the flowchart of 2nd vibration suppression driving | operation. It is a figure which shows an example of the operation panel of the pump apparatus of this modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings to be described below, the same or corresponding components are denoted by the same reference numerals and redundant description will be omitted.

Example 1
FIG. 1 is a diagram illustrating one embodiment of a motor assembly 100. As shown in FIG. 1, the motor assembly 100 includes a motor unit (motor unit) 10 and an inverter unit 20 disposed adjacent to the motor unit 10. The motor unit 10 includes a drive shaft 2, a motor (electric motor) 3 that rotates the drive shaft 2, and a motor casing 4 that houses the motor 3. The inverter unit 20 includes an inverter 22 which is variable speed means for supplying AC power of variable frequency to the motor 3, a control device 23 for controlling the operation of the inverter 22, and an inverter housing 24 for housing the inverter 22. . The control device 23 controls the rotational speed of the rotating device driven by the motor 3 and the motor 3 via the inverter 22. The inverter 22 includes a substrate and elements such as a switching element and a capacitor mounted on the substrate, and the substrate of the inverter 22 has an annular shape. The drive shaft 2 passes through a through hole 22 a formed at the center of the inverter 22, and the inverter 22 is disposed concentrically with the drive shaft 2.

  The motor casing 4 and the inverter housing 24 are connected to each other via a water sealing portion 19. The sealing portion 19 is, for example, an elastic sealing member having an annular shape, and prevents the infiltration of liquid from between the motor casing 4 and the inverter housing 24.

  The motor casing 4 and the inverter housing 24 are arranged concentrically with the drive shaft 2, and the drive shaft 2 passes through the central portion of the motor casing 4 and the central portion of the inverter housing 24. The drive shaft 2 is rotatably supported by bearings 21 and 25. In this embodiment, since the inverter housing 24 is disposed in the axial direction of the drive shaft 2, the motor assembly 100 can have a compact structure. Hereinafter, in the present specification, the motor casing 4 and the inverter housing 24 may be collectively referred to as a housing of the motor assembly 100. As in the case of the inverter 22, the drive shaft 2 may penetrate a through hole (not shown) formed in the central portion of the inverter housing 24. The drive shaft 2 penetrates the through hole (not shown) of the inverter housing 24 and the through hole 22a, so that the drive shaft 2 and the inverter housing 24 are not in contact with each other. be able to.

  In FIG. 1, the motor 3 is schematically depicted. The motor 3 is, for example, a permanent magnet type motor using a permanent magnet as a rotor. However, the motor 3 is not limited to a permanent magnet type motor, and may be various types of motors such as an induction motor and an SR motor.

  The motor assembly 100 further includes a cooling fan 8 fixed to the drive shaft 2. The cooling fan 8 is disposed concentrically with the drive shaft 2 and is located outside the inverter housing 24. When the motor 3 is driven, the driving force is transmitted to the drive shaft 2, and the cooling fan 8 fixed to the drive shaft 2 rotates with the drive shaft 2. As a result, the cooling fan 8 sucks ambient air, and the sucked air flows on the outer surfaces of the inverter housing 24 and the motor casing 4 to cool the inverter unit 20 and the motor unit 10. The inverter unit 20 is disposed between the cooling fan 8 and the motor unit 10, and the cooling fan 8, the inverter unit 20, and the motor unit 10 are disposed in series in this order.

  In the present embodiment, the peripheral wall portion of the inverter housing 24 has a cylindrical shape in accordance with the outer shape of the motor casing 4. In one embodiment, when the motor casing 4 has a special external shape by a member such as a fin or a terminal box, the inverter housing 24 may have a structure adapted to the shape of the motor casing 4.

  As a main vibration source of the motor assembly 100, the drive shaft 2 can be considered. For example, when the wear of the bearings 21 and 25 progresses and the abnormality occurs while the motor 3 is in operation, the vibration of the drive shaft 2 often changes. Further, the vibration of the rotating device to which the drive shaft 2 is connected is transmitted through the drive shaft 2. Therefore, it is desirable that the control device 23 measure the vibrations of the bearings 21 and 25 supporting the drive shaft 2. Therefore, the motor assembly 100 includes a first motor-side vibration sensor 31 disposed adjacent to the bearing 21 on the inverter 22 side and a second motor-side vibration disposed adjacent to the load-side bearing 25 (not shown). And a sensor 35. Each of the first motor-side vibration sensor 31 and the second motor-side vibration sensor 35 is electrically connected to the control device 23 through a signal line, and detects the vibration of the drive shaft 2 and the motor unit 10.

  The bearing 21 is disposed adjacent to the inverter unit 20 and on the opposite load side of the motor 3, and the bearing 25 is disposed on the opposite side of the bearing 21 (on the load side of the motor 3) across the motor 3. The bearing 21 is supported by the bearing support 4 a of the motor casing 4, and the bearing 25 is supported by the bearing support 4 b of the motor casing 4. The first motor side vibration sensor 31 is attached to the bearing support 4a, and the second motor side vibration sensor 35 is attached to the bearing support 4b.

  The bearings 21 and 25 are consumable parts that are periodically replaced and have a replaceable structure. Therefore, the first motor-side vibration sensor 31 and the second motor-side vibration sensor 35 include bearings 21 and bearings 25. It is good to be arranged in the place where exchange of is not prevented. In one embodiment, a groove (not shown) may be formed on the inner surface (that is, the surface in contact with the bearing 21) of the bearing support 4a, and the bearing 21 may be disposed in this groove. Similarly, a groove (not shown) may be formed on the inner surface (that is, the surface in contact with the bearing 25) of the bearing support 4b, and the bearing 25 may be disposed in this groove.

  Furthermore, in order to make each of the first motor side vibration sensor 31 and the second motor side vibration sensor 35 replaceable without attaching and detaching the bearing 21 and the bearing 25, the first motor side vibration sensor 31, the second motor Each of the side vibration sensors 35 may have a replaceable structure. In one embodiment, each of the first motor side vibration sensor 31 and the second motor side vibration sensor 35 may be detachably connected to the signal line.

  The vibration values detected by the first motor side vibration sensor 31 and the second motor side vibration sensor 35 are input to the control device 23. The signal lines of the first motor-side vibration sensor 31 and the second motor-side vibration sensor 35 do not disturb the operation of the motor 3 and / or the installation (longitudinal installation or horizontal installation) of the motor assembly 100, for example, motor It may be wired along the housing of the assembly 100 and connected to the controller 23. A connection line including a power line connecting the motor 3 and the inverter 22 may extend inside the motor casing 4 and the inverter housing 24 so that the connection line is not exposed to the outside of the motor assembly 100.

  In order to detect the vibration of the inverter unit 20, more specifically, the vibration in any of the inverter 22 and the inverter housing 24, the motor assembly 100 includes an inverter-side vibration sensor 36 disposed in the inverter unit 20. There is. In the present embodiment, the inverter-side vibration sensor 36 is attached to the inner surface of the inverter housing 24 in order to maintain the air tightness (and water tightness) of the inside of the inverter housing 24. In addition, since it is disposed at a position separated from the drive shaft 2 which is a vibration source, vibration caused by the inverter 22 (for example, a component having a high gravity position such as an electrolytic capacitor (not shown) of the inverter 22 resonates) It can be measured. In one embodiment, the inverter-side vibration sensor 36 may be attached to the inverter 22. In this case, the inverter-side vibration sensor 36 may be attached to a position separated from the drive shaft 2 of the inverter 22, that is, the outer peripheral portion of the inverter 22. Moreover, the inverter housing 24 can suppress the influence of the vibration of the drive shaft 2 more by using the anti-vibration pad comprised from elastic bodies, such as rubber | gum, for the sealing water part 19. FIG. The inverter-side vibration sensor 36 is electrically connected to the control device 23 via a signal line, and detects the vibration of the inverter 22.

  In the present embodiment, the motor assembly 100 includes the first motor-side vibration sensor 31, the second motor-side vibration sensor 35, and the inverter-side vibration sensor 36. Examples of these vibration sensors include acceleration and speed. Among various sensors for detecting displacement, etc., one or more kinds of sensors may be used in combination. Further, the number of vibration sensors and the arrangement location thereof are not limited to this embodiment. In addition to the drive shaft 2 and the inverter 22, a member serving as a vibration source is present, and when it is necessary to particularly detect the vibration of this member, a sensor for detecting the vibration of this member may be further disposed.

  FIG. 2 is a cross-sectional view schematically showing a motor assembly 100 and a pump device 200 provided with a rotating device such as a pump 50 on the load side of the motor assembly 100. As shown in FIG. As shown in FIG. 2, the pump 50 is, for example, a centrifugal pump, and includes an impeller 53 fixed to the rotating shaft 52 and a pump casing 54 for housing the impeller 53, and the transport fluid flowing in from the suction port 50a. Is pressurized and discharged to the discharge port 50b. The pump device 200 includes a rotary shaft 52 connected to the drive shaft 2 via a coupling 51, and a bearing 55 rotatably supporting the rotary shaft 52 from the pump casing 54. The bearing 55 is supported by a bearing support 54 a of the pump casing 54.

  In the present embodiment, the rotation shaft 52 also serves as a vibration source. The pulsation of the transport fluid of the pump 50 is transmitted to the rotating shaft 52. Further, for example, when foreign matter is mixed in the transport fluid, the foreign matter strikes the impeller 53 and its vibration is also transmitted to the rotation shaft 52. Furthermore, even if the wear of the bearing 55 progresses, the vibration of the rotating shaft 52 changes. Therefore, the pump-side vibration sensor 56 is attached to the bearing support 54 a that supports the bearing 55. The pump-side vibration sensor 56 is electrically connected to the control device 23, and is disposed in a groove formed in the inner surface of the bearing support 54a (that is, the surface in contact with the bearing 55). The pump-side vibration sensor 56 is electrically connected to the control device 23 via a signal line, and detects the vibration of the pump 50.

  The motor assembly 100 according to the present embodiment is applicable to various pumps as long as dimensional compatibility is provided. The connection between the motor assembly 100 according to the present embodiment and the rotary shaft 52, which is the drive shaft of the pump 50, is not influenced by the presence or absence of the coupling and / or the installation situation (for example, vertical or horizontal). For example, the motor assembly 100 and the pump 50 may be direct acting, and the drive shaft 2 may be extended to the inside of the pump casing 54 to fix the impeller 53. Further, the pump 50 may be a vertical shaft pump or a horizontal shaft pump, and the impeller 53 may be a single stage or multiple stages. In the present embodiment, although the pump device 200 shown in FIG. 2 is described as a water supply pump device installed on land, the application of the pump device 200 is not limited to this embodiment. For example, the pump device 200 may be a submersible pump device installed in water, or may be a vacuum pump device that forms a vacuum. The application of the pump device 200 may be changed according to the use environment and the like.

  FIG. 3 is a schematic view showing the configuration of the control device 23. As shown in FIG. As shown in FIG. 3, the control device 23 includes a storage unit 60 in which control programs and various data are stored (stored), and an operation unit 61 that performs operations in accordance with various control programs stored in the storage unit 60. A timer 62 connected to the arithmetic unit 61, an external communication unit 64 capable of communicating with the external terminal 63, and an input / output unit 65 for inputting / outputting various signals are provided. In addition, the control device 23 may be provided with an operation panel 66 capable of performing state display of the pump device 200 and various operations.

  The storage unit 60 uses ROM, HDD, EEPROM, FeRAM, nonvolatile memory such as flash memory, volatile memory such as RAM, and pumps such as automatic operation of the pump 50, manual operation, and test operation described later A control program for controlling the device 200 and various data related to the pump device 200 such as device information, set value information, maintenance information, history information, abnormality information, operation information and the like are stored. In addition, the storage unit 60 measures the vibration value measured by the first motor side vibration sensor 31, the second motor side vibration sensor 35, the inverter side vibration sensor 36, and the pump side vibration sensor 56, which will be described in detail later. , And a threshold value which is a reference of abnormal vibration of the pump device 200.

  The calculation unit 61 uses, for example, a CPU (central processing unit) or the like, and performs calculations for controlling the pump device 200 based on the control program and various information stored in the storage unit 60. The calculation unit 61 is for the vibration (vibration data or vibration information) input from the first motor-side vibration sensor 31, the second motor-side vibration sensor 35, the inverter-side vibration sensor 36, and the pump-side vibration sensor 56 to the input / output unit 65. On the other hand, Fourier transform is performed to calculate the vibration level for each frequency band and store it in the storage unit 60 as a “measured vibration value”. Furthermore, the calculation unit 61 compares the measured vibration value with a predetermined threshold value, and determines that the vibration of the pump device 200 is abnormal if the measured vibration value is larger than the threshold value. Further, the rotational speed of the motor 3 is calculated based on various control programs of the storage unit 60 and various data, and is output to the inverter 22 through the input / output unit 65.

  The timer 62 is a timekeeping unit, and for example, a ceramic oscillator, a quartz oscillator, an oscillator or the like is used. Also, instead of the timer 62, the clock of the CPU of the calculation unit 61 may be used.

  The external communication unit 64 can communicate with the external terminal 63. The external terminal 63 is not particularly limited as long as it is a dedicated controller, a PC (personal computer), or a PDA (Personal Digital Assistant) such as a smart phone and can arbitrarily change display of control information. The control device 23 is connected to the external terminal 63 by wired communication or wireless communication. The operation panel 66 and the external terminal 63 preferably have a GUI (Graphical User Interface) having the same function.

  The input / output unit 65 uses, for example, a port or communication, and inputs and outputs various signals. As an example of the input signal, detection values of the first motor side vibration sensor 31, the second motor side vibration sensor 35, the inverter side vibration sensor 36, and the pump side vibration sensor 56, the state of the inverter 22 (voltage, current, abnormality , Current value of frequency, etc.). Further, as an example of the output signal, the operation signal, stop signal, rotational speed, etc. of the motor 3 calculated by the calculation unit are output to the inverter 22 or an external output terminal (not shown). Further, it is preferable that the input / output unit 65 can input detection signals from a pressure sensor 73, a pressure sensor 74, and a flow sensor 72 described later. The input / output unit 65 may include an external input terminal (not shown) for switching to a test operation mode to be described later and performing the test operation.

  Hereinafter, in the present specification, when it is not necessary to distinguish the first motor side vibration sensor 31, the second motor side vibration sensor 35, the inverter side vibration sensor 36, and the pump side vibration sensor 56, simply “vibration sensor” I sometimes call. These vibration sensors are, for example, sensors that detect acceleration, velocity, and displacement, and one or more of these sensors may be used in combination.

  FIG. 4 is a schematic view of a pump installation 210 provided with the pump device 200. As shown in FIG. As shown in FIG. 4, the pump equipment 210 includes an inflow pipe 70 connected to the inflow port 50 a of the pump 50, a discharge pipe 71 connected to the discharge port 50 b of the pump 50, and the fluid flowing through the pump 50. A flow sensor (flow detector) 72 for detecting the flow rate, a pressure sensor (pressure detector) 73 for detecting the inflow pressure of the pump 50, and a pressure sensor (pressure detector) 74 for detecting the discharge pressure of the pump 50 It is provided. Further, on the downstream side of the pressure sensor (pressure detector) 74 in the discharge pipe 71, a valve 75 for stopping the flow passage on the discharge side of the pump 50 is provided.

  A flow rate sensor (flow rate detector) 72 for detecting the flow rate of the fluid flowing inside the pump 50 and a pressure sensor (pressure detector) 73 for detecting the inflow pressure of the pump 50 are attached to the inflow pipe 70 It is good. A pressure sensor (pressure detector) 74 for detecting the pressure on the discharge side of the pump 50 is attached to the discharge pipe 71. The flow rate sensor 72 and the pressure sensors 73 and 74 are electrically connected to the input / output unit 65 of the controller 23. The flow rate signal detected by the flow rate sensor 72 and the pressure signal detected by the pressure sensors 73 and 74 are The data is output to the input / output unit 65 of the control device 23. The control device 23 acquires a flow rate value based on the flow rate detected by the flow rate sensor 72, and acquires a pressure value based on the pressure detected by the pressure sensors 73 and 74. The flow rate sensor 72 provided in the inflow pipe 70 measures the discharge flow rate of the pump 50. Further, instead of or in addition to the flow rate sensor 72 provided in the inflow pipe 70, the flow rate sensor 72 may be provided in the discharge pipe 71.

  Vibration generated in the pump device 200 by various factors including installation environment of the pump device 200 and dimensional error of the pump device 200, output of the pump 50, outer diameter of the impeller 53, lift and flow rate, start / stop frequency, etc. There is a variation in the size of. Therefore, it is preferable to perform a test operation to be described later, store the measured vibration value of the pump device 200 in the storage unit 60, and detect the abnormal vibration during the pumping operation of the pump 50 by the measured vibration value. For example, the control device 23 can more accurately determine the occurrence of the abnormal vibration of the pump device 200 by correcting the threshold value which is a reference for determining the abnormal vibration of the pump device 200 using the measured vibration value. it can. Hereinafter, a test operation method of the pump device 200 will be described.

  The test operation is performed in the test operation mode, and when the pump device 200 is shipped from the factory, after initial installation of the pump device 200 or after maintenance of the pump device 200 (for example, replacement of parts such as bearings) It is preferable that the pump device 200 be performed at a timing at which any failure does not occur and a normal pumping operation can be performed. More specifically, in the water supply apparatus 200, the external terminal 63 and the operation panel 66 are provided with a test operation button (not shown), and the motor 3 is initially activated (power on) or restarted (power on) Furthermore, switching to the test operation mode and the test operation may be performed by the user operating the test operation button. In addition, it is preferable that the test operation mode can be interrupted at an arbitrary timing by a user operation or the like.

  FIG. 5 is a diagram showing an operation flowchart in the test operation mode. First, the user prepares to start the test operation. In the present embodiment, in consideration of the influence on the piping system, the valve 75 is fully closed, and the test operation is performed by the shutoff operation of the pump 50. Therefore, first, in step S101, the user once opens the flow path on the discharge side of the pump 50 and then fully closes the valve 75. Further, the user turns on the power of the pump device 200 and prepares to switch to the test operation mode (see step S101 in FIG. 5). Next, a test operation of the pump device 200 is started with an operation or the like by the user as a trigger (see step S102 in FIG. 5).

  The control device 23 raises the rotational speed of the motor 3 stepwise to a predetermined rotational speed (for example, rated rotational speed), and acquires a vibration value (measurement vibration value) corresponding to the rotational speed in each step (FIG. 5) Step S103)). In one embodiment, the controller 23 raises the frequency of the inverter 22 stepwise (0 Hz, 5 Hz, 10 Hz,... 45 Hz, 50 Hz) at intervals of 5 Hz from 0 Hz to the maximum frequency (for example, 50 Hz). . Alternatively, the rotational speed of the motor 3 may be increased stepwise by controlling the rotational speed of the motor 3 such that the target pressure is increased stepwise and the discharge pressure of the pump 50 becomes the target pressure. . In the frequency in each step, the measured vibration value after waiting for a predetermined time (for example, about 10 seconds) until the frequency and the discharge pressure are stabilized is stored in the storage unit 60. The measured vibration value at each stage may be stored in the storage unit 60 by a button operation of the user by providing a “memory button” (not shown) on the control device 23 or an external terminal.

  FIG. 6 is a diagram showing an example of a storage table for storing the measured vibration value in the storage unit 60. As shown in FIG. In the present embodiment, the storage tables Tbl1 and Tbl2, Tbl3 and Tbl4 are storage tables having the same array structure, and the measured vibration value for each vibration sensor is stored as a test measured vibration value. That is, the measured vibration value of the first motor side vibration sensor 31 is the memory table Tbl1, the measured vibration value of the second motor side vibration sensor 35 is the memory table Tbl2, and the measured vibration value of the inverter side vibration sensor 36 is the memory table Tbl3, the pump side The measured vibration value of the vibration sensor 56 is stored in the storage table Tbl4. As shown in the storage table Tb11, the storage unit 60 may store the vibration level for each frequency band (for example, f1, f2, f3...) Of the vibration corresponding to the rotational speed. Specifically, the control device 23 performs Fourier transform on the vibration sent from the vibration sensor at each rotational speed, and for each of a plurality of frequency bands (for example, f1, f2, f3... FN) The vibration level of V may be stored as a measured vibration value for each corresponding frequency.

  Here, when excessive vibration occurs at a specific rotational speed during the test operation of the pump 50, the control device 23 may store the state of the pump device 200 at the rotational speed. Specifically, the storage unit 60 has a “vibration abnormal area” for storing the state of the pump apparatus 200 at the rotational speed at which excessive vibration occurs, and the rotational speed, for example, in the vibration abnormal area. It is preferable to store at least one of the pump pressure at the rotational speed and the discharge flow rate at the rotational speed. Then, the control device 23 may control the pump 50 so as to avoid the state of the “vibration abnormal region” in which the excessive vibration occurs during the pumping operation in the automatic operation of the pump device 200. Specifically, the control device 23 controls the rotational speed of the motor 3 so as to avoid the rotational speed and the discharge flow rate stored in the vibration abnormal area, or the discharge in which the target pressure is stored in the vibration abnormal area. The pump 50 may be controlled to avoid becoming equal to the pressure. By doing so, it is possible to suppress the vibration at a specific rotational speed or discharge pressure. In addition, when a vibration larger than a predetermined threshold occurs, or when the difference between the vibration value of other rotational speeds is larger than the predetermined threshold, the control device 23 excessive vibration at a specific rotational speed. It is preferable to store the state of the pump device 200 in the vibration abnormal area, judging that In addition to or instead of storing the “vibration abnormal area” during the test operation of the pump 50, the user may change the “vibration abnormal area” by the operation panel 66 or the external terminal 63. The storage unit 60 may have one or more “vibration abnormal area”.

  The control device 23 may further acquire the discharge pressure corresponding to the rotational speed at each stage of the test operation, and store the discharge pressure in the storage tables Tbl1, Tbl2, Tbl3, and Tbl4. Then, the control device 23 can associate the discharge pressure with the vibration value, and can identify the vibration caused by the pressure of the fluid acting on the pump 50. When the pump device 200 is, for example, a booster pump for a direct connection water supply device and the suction pressure fluctuates, the storage tables Tbl1, Tbl2, Tbl3 and Tbl4 further have suction pressures corresponding to rotational speeds in respective stages. You may memorize. In this case, a pressure value obtained by subtracting the suction pressure from the discharge pressure may be stored.

  Next, when the measurement of the measured vibration value is finished up to a predetermined rotational speed in step S103 of FIG. 5, the test operation mode of the pump device 200 is ended using the operation by the user as a trigger, and the test operation of the pump device 200 is ended. (See step S104 in FIG. 5). Since the measured vibration values of the storage tables Tbl1 to Tbl4 stored in step S103 are vibration values of the pump device 200 at the normal time, the control device 23 is a pump device based on the measured vibration values of the storage tables Tbl1 to Tbl4. 200 abnormal vibrations can be detected.

  As described above, the control device 23 can detect abnormal vibration in accordance with individual differences among the pump devices 200, the installation environment, and the like by storing the measured vibration values in the storage tables Tbl1 to Tbl4 of the storage unit 60. .

  Next, detection of abnormal vibration during operation of the pump device 200 will be described. The abnormal vibration may be detected, for example, when the pump 50 is pumping in automatic operation, that is, while the motor 3 is operating. Here, the motor assembly 100 of the pump device 200 is disposed in the bearing 21 and the first motor-side vibration sensor 31 disposed adjacent to the bearing 25, the second motor-side vibration sensor 35, and the inverter unit 20. An inverter-side vibration sensor 36 is provided, and the cause of the abnormal vibration of the component of the motor assembly 100 can be identified by the combination of the abnormal vibration of each vibration sensor. In the following embodiment, a method of determining abnormality of the motor assembly 100 and identifying the cause of the abnormal vibration will be described.

  The control device 23 analyzes the vibration detected by the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36 while the motor 3 is operating in automatic operation or manual operation (the Fourier transform And store the vibration level corresponding to the plurality of frequency bands (f1, f2, f3...) In the storage unit 60 as the current value of the measured vibration value. Then, at least one of the vibration levels of the current values of the measured vibration values of the first motor-side vibration sensor 31, the second motor-side vibration sensor 35, and the inverter-side vibration sensor 36 exceeds a predetermined threshold. The controller 23 determines that some abnormality has occurred in the motor assembly 100 as a vibration abnormality when the time period i continues.

  Here, the threshold value for detecting the vibration abnormality is basically the value of the vibration level. One or more threshold values may be stored in advance in the storage unit 60 of the control device 23. The control device 23 is stored in a memory (not shown) of the external terminal 63 via the external communication unit 64. It may be read as an initial value. The threshold may be a fixed value or a set value that can be changed by the user. The threshold value may be calculated or corrected based on the measured vibration value stored in the storage tables Tbl1 to Tbl4 during the test operation.

  Here, the predetermined threshold used in the following description will be described. The threshold value is a two-stage threshold value, that is, threshold values A1, A2 and A3 (first threshold value), and threshold values B1, B2 and B3 larger than threshold values A1, A2 and A3. And (second threshold). The threshold values A1 and B1 are to be compared with the current value of the measured vibration value of the inverter-side vibration sensor 36. The threshold values A2 and B2 are to be compared with the current value of the measured vibration value of the first motor-side vibration sensor 31. The threshold values A3 and B3 are to be compared with the current value of the measured vibration value of the second motor-side vibration sensor 35.

  In one embodiment, each of the thresholds A1 to A3 may be the same value, and in another embodiment, each of the thresholds A1 to A3 may be different values. Similarly, each of the thresholds B1 to B3 may be the same value, and in another embodiment, each of the thresholds B1 to B3 may be different values. The threshold may be determined based on the operation of the pump device 200 and the influence on the outside. For example, vibration generated when at least one of the bearing 21, the bearing 25, and the bearing 55 is broken, vibration causing noise, or mechanical components such as missing components of the pump apparatus and / or loose screws. The threshold value may be different due to vibration or the like generated by the Hereinafter, threshold values A1 to A3 may be collectively referred to as threshold value A (first threshold value), and threshold values B1 to B3 are collectively referred to as threshold value B (second threshold value). Sometimes called.

  The control device 23 issues an alarm and stops the operation of the motor 3 when at least one of the present values of the measured vibration value of the vibration sensor is equal to or more than the threshold value B (third state). When at least one of the current measured vibration values of the vibration sensor is larger than the threshold value A (second state), the control device 23 detects the abnormal vibration and, based on the measured vibration value, the abnormal vibration specify a reason. Then, an alarm is issued to the operation panel 66 and the external terminal 63 to continue the operation of the motor 3. In addition, when all of the present values of the measured vibration values of the vibration sensor are equal to or less than the threshold A (first state), the vibration is within the normal range.

  Here, the control device 23 corresponds to the rotational speed or discharge pressure of the pump 50 and each vibration sensor according to each measured vibration value of the storage tables Tbl1 to Tbl3 obtained by the test operation described in FIG. An example of calculating the threshold values A and B will be described.

  For example, control device 23 may determine threshold values A and B by adding or multiplying a numerical value (for example, several percent) indicating a predetermined ratio to each measured vibration value of storage tables Tbl1 to Tbl3. In addition, when the pump device 200 performs estimated end pressure control, the target pressure also increases as the flow rate (rotational speed of the pump 50) increases, so that the pump device is likely to generate vibrations. Therefore, the higher the rotational speed of the pump 50 is, the larger the numerical value to be added to or multiplied by the measured vibration value of the storage tables Tbl1 to Tbl3 may be. Alternatively, any one of an average value, a maximum value, and a minimum value of each measured vibration value of the storage tables Tbl1 to Tbl4 may be calculated as a representative value, and a predetermined value may be added to or multiplied by the representative value. It is preferable to calculate threshold values A and B.

  Further, as another example of the method of determining the threshold values A and B from the storage tables Tbl1 to Tbl3, a correction amount (correction value) which is a difference between measured vibration values of the storage tables Tbl1 to Tbl3 and a predetermined reference vibration value. The initial values of the predetermined threshold values A and B stored in advance in the storage unit 60 may be corrected based on the calculated correction amount. Here, the reference vibration value described above corresponds to a representative performance value when a large number of pump devices of the same design and the same model are operated, and is measured in a memory table (not shown) having the same arrangement as memory tables Tbl1 to Tbl3. The vibration value may be stored. For example, the control device 23 calculates the threshold value by adding or subtracting the correction amount to the initial values of the predetermined threshold values A and B. Control device 23 stores threshold values (corrected threshold values) corrected from the initial value in storage unit 60 as threshold values A and B.

  The timing at which the threshold values A and B are calculated may be the timing at which step S103 in FIG. 5 ends, or the operation start of the pump 50 may be started. The threshold values A and B may be calculated also when the reference vibration value and the initial values of the threshold values A and B are changed. In addition, the measurement vibration values of the “vibration abnormal area” are excluded from the threshold values A and B by using predetermined initial values instead of the measured vibration values of the storage tables Tbl1 to Tbl4 in the “vibration abnormal area”. It may be calculated. Thus, by determining the threshold values A and B using the measured vibration values of the memory tables Tbl1 to Tbl3, the abnormal vibration of the pump device 200 is detected based on the measured vibration values stored in the test operation. Therefore, abnormal vibration can be detected according to the installation environment and application of the pump device 200.

  Hereinafter, a method of detecting the abnormal vibration and further identifying the cause of the abnormal vibration of the components of the motor assembly 100 will be described.

  FIGS. 7, 10, 13 and 16 are diagrams showing measured vibration values when abnormal vibration is generated due to any cause. FIGS. 9, 12, 15 and 18 are diagrams showing the presence or absence of detection of abnormal vibration of the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36. FIG. In FIG. 7, the horizontal axis indicates the frequency band [Hz] of vibration, and the vertical axis indicates the vibration level [dB]. Also in FIG. 10, FIG. 13 and FIG. 16 described later, the horizontal axis indicates the frequency band [Hz] of vibration and the vertical axis indicates the vibration level [dB]. Each of FIGS. 7, 10, 13 and 16 shows the measured vibration value detected by the inverter-side vibration sensor 36, which is shown in FIGS. 7, 10, 13 and 16. Each (2) of is a figure which shows the measurement vibration value detected with the 1st motor side vibration sensor 31, and (3) of each of FIG.7, FIG.10, FIG.13 and FIG. It is a figure which shows the measurement vibration value detected by the motor side vibration sensor 35. FIG. FIGS. 8, 11, 14 and 17 show a flow chart for identifying the cause of abnormal vibration of the components of the motor assembly 100 by the controller 23, and at any timing during operation of the motor assembly 100. It is repeatedly executed. Further, it is preferable that the control device 23 execute the flowcharts of FIG. 8, FIG. 11, FIG. 14 and FIG. 17 in parallel so as to be able to simultaneously detect the causes of a plurality of abnormal vibrations.

  As an example of the 1st cause of the abnormal vibration of the component of the motor assembly 100, the case where abnormality has generate | occur | produced in the drive shaft 2 is demonstrated, referring FIG. 7, FIG. 8 and FIG. FIG. 7 is a diagram showing measured vibration values when an abnormality occurs in the drive shaft 2. When the rotating drive shaft 2 is bent or distorted, it is conceivable that abnormal vibration is generated in the substantially same frequency band in the bearing 21 and the bearing 25 that support the drive shaft 2. Therefore, in this case, although the first motor side vibration sensor 31 and the second motor side vibration sensor 35 simultaneously detect abnormal vibration, the inverter side vibration sensor 36 not in direct contact with the drive shaft 2 does not detect abnormal vibration (see FIG. 9).

  Specifically, as shown in FIG. 8, the control device 23 compares the vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 with the threshold value A1 (see step S150 in FIG. 8). When the vibration level of the current value of the measured vibration value of the side vibration sensor 36 is less than or equal to the threshold value A1 (step S150: NO), the vibration level of the current value of the measured vibration value of the first motor side vibration sensor 31 and the threshold value A2 And (see step S152 in FIG. 8). If the vibration level of the current value of the measured vibration value of the first motor-side vibration sensor 31 is larger than the threshold value A2 (step S152: YES), the control device 23 controls the measurement vibration value of the second motor-side vibration sensor 35. The vibration level of the current value is compared with the threshold value A3 (see step S154 in FIG. 8). When the vibration level of the current value of the measured vibration value of the second motor-side vibration sensor 35 is larger than the threshold value A3 (step S154: YES), the control device 23 controls the first motor-side vibration sensor 31 and the second motor It is judged whether the frequency band in which the vibration larger than the threshold A is detected by the side vibration sensor 35 is the same (see step S156 in FIG. 8) and the frequency band is the same (step S156: YES), it is determined that the abnormality of the drive shaft 2 is the cause of the abnormal vibration (step S158), and the flowchart of FIG. 8 is ended. If the frequency band in which the vibration larger than the threshold value A is different in step S156 (step S156: NO), the control device 23 ends the flowchart of FIG. 17 without specifying the cause of the abnormal vibration. Do.

  The vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 is larger than the threshold value A1 (step S150: YES), the vibration level of the current value of the measured vibration value of the first motor-side vibration sensor 31 is the threshold In the case where the vibration level of the current value of the measured vibration value of the second motor-side vibration sensor 35 is less than or equal to the threshold value A3 (step S154: NO), the control is performed. The apparatus 23 ends the flowchart of FIG. 8 without identifying the cause of the abnormal vibration.

  As shown in FIG. 7, the control device 23 determines that the vibration levels of the current value of the measured vibration value of the first motor side vibration sensor 31 and the current value of the measured vibration value of the second motor side vibration sensor 35 are substantially the same. (Here, f3) is equal to or higher than the threshold A, and in the case where the vibration level is equal to or lower than the threshold A in the relevant frequency band (here, f3) of the measured vibration value of the inverter-side vibration sensor 36, The controller 23 determines that an abnormality has occurred in the drive shaft 2.

  As an example of the second cause of the abnormal vibration of the component of the motor assembly 100, referring to FIGS. 10, 11, and 12 for the case where an abnormality occurs in any of the bearing 21 and the bearing 25. While explaining. FIG. 10 is a diagram showing measured vibration values when an abnormality occurs in the bearing 21. As shown in FIG. FIG. 11 is a flowchart for identifying the cause of abnormal vibration of the components of the motor assembly 100 by the control device 23. FIG. 12 is a diagram showing the presence or absence of detection of abnormal vibration of the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36 in FIG.

  When an abnormality (for example, damage) occurs in any of the bearing 21 and the bearing 25, the abnormal vibration (specific vibration) occurs only in the bearing because the bearing in which the abnormality occurs has a particularly large vibration. . Therefore, in this case, only the vibration sensor corresponding to the bearing in which the abnormality has occurred detects the vibration exceeding the threshold A earlier than the other vibration sensors (FIG. 12).

  Specifically, as shown in FIG. 11, the control device 23 compares the vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 with the threshold value A1 (see step S160 in FIG. 11). When the vibration level of the current value of the measured vibration value of the side vibration sensor 36 is less than or equal to the threshold value A1 (step S160: NO), the vibration level of the current value of the measured vibration value of the first motor side vibration sensor 31 and the threshold value A2 And (refer to step S162 in FIG. 11). When the vibration level of the current value of the measured vibration value of the first motor side vibration sensor 31 is larger than the threshold value A2 (step S162: YES), the control device 23 controls the measurement vibration value of the second motor side vibration sensor 35. The vibration level of the current value is compared with the threshold value A3 (see step S164 in FIG. 11). If the vibration level of the current value of the measured vibration value of the second motor-side vibration sensor 35 is less than or equal to the threshold value A3 (step S164: NO), the controller 23 determines that the cause of the abnormal vibration is the bearing 21 (see FIG. Then, the flow chart of FIG. 11 is ended.

  The vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 is larger than the threshold value A1 (step S160: YES), the vibration level of the current value of the measured vibration value of the first motor-side vibration sensor 31 is the threshold In the case of either value A2 or less (step S162: NO) or the vibration level of the current value of the measured vibration value of the second motor side vibration sensor 35 is larger than the threshold A3 (step S164: YES) The controller 23 ends the flowchart without specifying the cause of the abnormal vibration.

  For example, when the bearing 21 is damaged and the drive shaft 2 comes into contact with the bearing support 4a, the first motor-side vibration sensor 31 first vibrates in a fixed frequency band (here, f2) as compared to other vibration sensors. Detect the level. Therefore, any of the vibration levels of the measured vibration value of the first motor-side vibration sensor 31 exceeds the specific threshold A2 in a constant frequency band (here, f2), and the second motor-side vibration sensor 35 The vibration level of the measured vibration value does not exceed the threshold A3 in any frequency band, and furthermore, the vibration level of the measured vibration value of the inverter-side vibration sensor 36 does not exceed the threshold A1 in any frequency band In this case, the control device 23 can determine that an abnormality has occurred in the bearing 21.

  Similarly, in the control device 23, any vibration level of the measured vibration value of the second motor-side vibration sensor 35 exceeds the threshold value A3, and the vibration level of the measured vibration value of the first motor-side vibration sensor 31. If neither of the above exceeds the threshold value A2, and furthermore, none of the vibration levels of the measured vibration value of the inverter-side vibration sensor 36 exceeds the threshold value A1, the controller 23 causes an abnormality in the bearing 25. It can be determined that

  As an example of the 3rd cause of the abnormal vibration of the component of the motor assembly 100, the case where abnormality generate | occur | produces in the inverter part 20 is demonstrated, referring FIG. 13, FIG. 14, and FIG. FIG. 13 is a diagram showing measured vibration values in the case where abnormal vibration caused by abnormality of the inverter unit 20 is generated. FIG. 15 is a diagram showing the presence or absence of detection of abnormal vibration of the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36 in FIG.

  It is conceivable that abnormal vibration is generated in the inverter unit 20 due to instability of fixing of the inverter 22 to the inverter housing 24 and / or resonance of elements constituting the inverter 22 or the like. In this case, first, the measured vibration value of the inverter-side vibration sensor 36 detects abnormal vibration, and none of the measured vibration values of the first motor-side vibration sensor 31 and the second motor-side vibration sensor 35 detects abnormal vibration (see FIG. 15).

  Specifically, as shown in FIG. 14, the control device 23 compares the vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 with the threshold value A1 (see step S170 in FIG. 14). When the vibration level of the current value of the measured vibration value of the side vibration sensor 36 is larger than the threshold value A1 (step S170: YES), the vibration level and the threshold value of the current value of the measured vibration value of the first motor side vibration sensor 31 It compares with A2 (refer step S172 of FIG. 14). If the vibration level of the current value of the measured vibration value of the first motor side vibration sensor 31 is less than or equal to the threshold value A2 (step S172: NO), the control device 23 determines the current measured vibration value of the second motor side vibration sensor 35. The vibration level of the value is compared with the threshold value A3 (see step S174 in FIG. 14). If the vibration level of the current value of the measured vibration value of the second motor-side vibration sensor 35 is less than or equal to the threshold A3 (step S174: NO), the control device 23 determines that the cause of the abnormal vibration is the inverter unit 20 ( Step S178) is performed, and the flow chart of FIG. 14 is ended.

  The vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 is less than or equal to the threshold A1 (step S170: NO), and the vibration level of the current value of the measured vibration value of the first motor-side vibration sensor 31 is the threshold A2 If the vibration level of the current value of the measured vibration value of the second motor side vibration sensor 35 is larger than the threshold value A3 (step S174: YES). The controller 23 ends the flowchart of FIG. 14 without identifying the cause of the abnormal vibration.

  The control device 23 measures the measured vibration of the first motor-side vibration sensor 31 by exceeding any one of the threshold values A1 in a fixed frequency band (here, f1) with any of the vibration levels of the measured vibration value of the inverter-side vibration sensor 36. If the vibration level of the value does not exceed the threshold A2 in any frequency band and the vibration level of the measured vibration value of the second motor-side vibration sensor 35 does not exceed the threshold A3 in any frequency band, It is determined that the inverter unit 20 is the cause of the vibration abnormality.

  Here, as shown in FIG. 13, when the inverter-side vibration sensor 36 detects abnormal vibration and the other first motor-side vibration sensor 31 and second motor-side vibration sensor 35 do not detect abnormal vibration, the control device 23. It is preferable to determine the occurrence of abnormality of the inverter unit 20 based on only the threshold values A1 to A3. In this case, after the control device 23 determines the occurrence of the abnormality of the inverter unit 20, it is preferable to continue the operation of the motor assembly 100 while issuing an alarm. The pump device 200 may be used as a lifeline of a pump device for water supply or drainage, etc., and a pump can not supply power to the motor 3 such as dropping of an element of the inverter unit 20 due to excessive vibration. It is preferable to continue the operation of 50.

  As an example of the fourth cause of the abnormal vibration of the component of the motor assembly 100, the case where abnormality occurs in the motor casing 4 and the inverter housing 24 (the housing of the motor assembly 100) is shown in FIGS. This will be described with reference to FIG. FIG. 16 is a diagram showing measured vibration values when an abnormality occurs in the housing of the motor assembly 100. As shown in FIG. FIG. 18 is a diagram showing the presence or absence of detection of abnormal vibration of the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36 in FIG.

  For example, when an abnormality (for example, noise) is generated in the housing of the motor assembly 100 due to an unstable installation of the motor assembly 100 or the like, an abnormal vibration is generated in the motor casing 4 and the inverter housing 24 It is conceivable. Therefore, in this case, all of the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36 simultaneously detect abnormal vibration (see FIG. 18).

  Specifically, as shown in FIG. 17, the control device 23 compares the vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 with the threshold value A1 (see step S180 in FIG. 17). When the vibration level of the current value of the measured vibration value of the side vibration sensor 36 is larger than the threshold value A1 (step S180: YES), the vibration level and the threshold value of the current value of the measured vibration value of the first motor side vibration sensor 31 It compares with A2 (refer step S182 of FIG. 17). When the vibration level of the current value of the measured vibration value of the first motor side vibration sensor 31 is larger than the threshold value A2 (step S182: YES), the control device 23 controls the measurement vibration value of the second motor side vibration sensor 35. The vibration level of the current value is compared with the threshold value A3 (see step S184 in FIG. 17). When the vibration level of the current value of the measured vibration value of the second motor-side vibration sensor 35 is larger than the threshold value A3 (step S184: YES), the control device 23 controls the inverter-side vibration sensor 36 and the first motor-side vibration. It is determined whether the frequency band in which the vibration larger than the threshold A is detected by the sensor 31 and the second motor-side vibration sensor 35 is the same (see step S186 in FIG. 17), and the frequency band in which these vibrations are generated is If it is determined that they are the same (step S186: YES), it is determined that an abnormality has occurred in the housing of the motor assembly 100 (step S188), and the flowchart of FIG. 17 is ended. If at least one of the frequency bands in which the vibration larger than the threshold value A is different in step S186 (step S186: NO), the control device 23 does not specify the cause of the abnormal vibration, as shown in FIG. End the flowchart of 17.

  The vibration level of the current value of the measured vibration value of the inverter-side vibration sensor 36 is less than or equal to the threshold A1 (step S180: NO), and the vibration level of the current value of the measured vibration value of the first motor-side vibration sensor 31 is the threshold A2 In the case where either of the following (step S182: NO) or the vibration level of the current value of the measured vibration value of the second motor side vibration sensor 35 is the threshold A3 or less (step S184: NO), the control device 23 Ends the flowchart of FIG. 17 without identifying the cause of the abnormal vibration.

  The control device 23 determines that any vibration level of the measurement vibration value of the first motor side vibration sensor 31, the measurement vibration value of the second motor side vibration sensor 35, and the measurement vibration value of the inverter side vibration sensor 36 has threshold values A1 to A1. If A3 is exceeded, it is determined that an abnormality has occurred in the whole of the motor casing 4 and the inverter housing 24, that is, the housing of the motor assembly 100. When an abnormality occurs in the housing of the motor assembly 100, the first motor-side vibration sensor 31, the second motor-side vibration sensor 35, and the inverter-side vibration sensor 36 have the same cycle (in this example, f1, f2,. f3) detecting an abnormal vibration equal to or more than a predetermined swing width.

  As shown in FIG. 16, when all of the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36 detect abnormal vibration, the control device 23 sets threshold values A1 to A3. The occurrence of an abnormality in the housing of the motor assembly 100 may be determined based solely on the When an abnormality occurs in the housing of the motor assembly 100, the control device 23 continues the operation of the motor assembly 100 while issuing an alarm. This is preferable to continue the operation, since the motor assembly 100 itself is unlikely to be seriously affected if the housing of the motor assembly 100 is abnormal.

  The generated abnormality and the corresponding specific measurement vibration value differ depending on the configuration of the pump 50 and the motor assembly 100 and / or the installation environment. Therefore, the combination of detection of abnormal vibration by a single or a plurality of vibration sensors may be changed to cope with them. Also, although the threshold values A and B have been described using the same symbols as the first cause to the fourth cause of the abnormal vibration described above, different threshold values are used for the first cause to the fourth cause, respectively. May be

  According to the present embodiment, the control device 23 can identify the cause of the abnormal vibration by detecting the abnormal vibration of the plurality of vibration sensors. Therefore, the worker can promptly take measures to eliminate abnormal vibration, such as component replacement.

  The cause of the abnormal vibration once specified by the above-described method may be held until it can be confirmed by the control device 23 that the cause has been removed. Specifically, in all of the first motor side vibration sensor 31, the second motor side vibration sensor 35, and the inverter side vibration sensor 36, until the present value of the measured vibration value during operation becomes equal to or less than the threshold value A, Or, it may be continued until the reset operation is performed by the operator. Further, the present invention is not limited to this, and may continue only while all the conditions for identifying the cause of the abnormal vibration are satisfied. When the cause of the abnormal vibration is specified, the control device 23 may notify by the operation panel 66, the external terminal 63, and / or the input / output unit 65. Further, the cause of the identified vibration may be stored in the storage unit 60 as a history.

  In the embodiment described above, the method of identifying the cause of the abnormal vibration of the motor assembly 100 has been described, but the method of determining the abnormal vibration is the pump device 200 (see FIG. 2) provided with the pump-side vibration sensor 56. Can also be applied.

  In the embodiment described above, the method for the controller 23 to determine abnormal vibration of the motor assembly 100 has been described, but when the pump device 200 is used as a lifeline such as for water supply or drainage, the operation of the pump 50 It is preferable to continue as much as possible. Therefore, the control device 23 executes a vibration suppression operation (a first vibration suppression operation, a second vibration suppression operation) in which the rotational speed of the motor 3 is changed by detecting the abnormal vibration. In the following embodiments, a method for performing a vibration suppression operation that can continue the operation as much as possible will be described with reference to the drawings.

  FIG. 19 is a state transition diagram showing changes in the operating state of the motor assembly 100. As shown in FIG. The state transition diagram of FIG. 19 may be repeatedly executed at an arbitrary timing (for example, several msec to several hundreds msec) after power-on of the control device 23. Also, the state transition diagram of FIG. 19 may be implemented to be processed in parallel with the flowcharts of FIGS. 8, 11, 14 and 17. In addition, in FIG. 19, about the process same as FIGS. 20-23 mentioned later, the same code | symbol is provided and partial description is abbreviate | omitted.

  First, changes in the operating state of the motor assembly 100 shown in FIG. 19 will be described. After the pump device 200 is installed or at the time of first power-on at the end of maintenance, the operating state of the motor assembly 100 is the operation stop state of S00. Here, when the test operation is performed in the test operation mode S10 (see FIG. 5) as needed by the operation of the user, the flowchart of FIG. 5 is executed, and the test operation mode S10 ends (step S104 in FIG. 5). Return to the operation stop state S00 at reference). From the operation stop state S00, the state becomes the START state S01 in which processing such as initialization of the control device 23 is performed by the user's manual operation or the like, and subsequently, the motor is operated by the automatic operation or the manual operation or the like The operating state of the assembly 100 shifts to the normal operating state S30. Here, the START state S01 may be omitted.

  During the normal operation state S30, the control device 23 sets the rotational speed F of the motor 3 to a normal rotational speed F0 described later. Then, when the measured vibration value becomes equal to or greater than the threshold B (step S208: YES) in the flowchart of FIG. 20 being executed in parallel during the first vibration suppression operation state S40, the motor assembly is stopped (step S209). The operation state of the solid 100 returns to the operation stop state S00. When abnormal vibration occurs in which the measured vibration value of the motor assembly 100 is larger than the threshold A and smaller than the threshold B and becomes abnormal occurrence flag = 1 (step S206) during the normal operation state S30 (the step S206) Step S302: YES) The operating state of the motor assembly 100 shifts to the first vibration suppression operating state S40.

  During the first vibration suppression operation state S40, the control device 23 sets the rotational speed F of the motor 3 to a first rotational speed F1 described later. Then, when the measured vibration value becomes equal to or greater than the threshold B (step S208: YES) in the flowchart of FIG. 20 being executed in parallel during the first vibration suppression operation state S40, the motor assembly is stopped (step S209). The operation state of the solid 100 returns to the operation stop state S00. When the first vibration suppression operation state S40 ends (step S406: YES) during the first vibration suppression operation state S40, the operation state of the motor assembly 100 returns to the normal operation S30. Furthermore, since the first vibration suppression operation state S40 is continuously executed a predetermined number of times in step S408 of FIG. 22 (step S408: YES), the operation state of the motor assembly 100 is the first vibration suppression operation state S40. To the second vibration suppression operation state S50.

  During the second vibration suppression operation state S50, the control device 23 sets the rotational speed F of the motor 3 to a second rotational speed F2 described later. Then, in the flowchart of FIG. 20 being executed in parallel during the second vibration suppression operation state S50, when the measured vibration value becomes equal to or higher than the threshold B (step S208: YES) and the operation stops (step S209), the motor The operation state of the assembly 100 returns to the operation stop state S00. Further, during the second vibration suppression operation state S50, the operation state of the motor assembly 100 can be returned to the normal operation S30 by using the alarm reset by the user (S508: YES) as a trigger.

  As described above, since the control device 23 can execute the operation of suppressing the vibration in the two steps of the first vibration suppression operating state S40 and the second vibration suppression operating state S50, the control device 23 can Driving can be continued.

  Here, the normal driving state S30, the first vibration suppression driving state S40, and the second vibration suppression driving state S50 will be described in detail with reference to the flowcharts of FIGS. 20, 21, 22 and 23. FIG. 20 shows a flowchart for detecting abnormal vibration of the motor assembly by the controller 23. FIG. 21 shows a flowchart of the normal operation by the control device 23. FIG. 22 shows a flowchart of the first vibration suppressing operation by the control device 23. FIG. 23 shows a flowchart of the second vibration suppressing operation by the control device 23. In the normal operation state S30 in the state transition diagram of FIG. 19, the flowcharts of FIG. 20 and FIG. 21 are executed in parallel, and in the first vibration suppression operation state S40, the flowcharts of FIG. In the second vibration suppression operation state S50, the flowcharts of FIG. 20 and FIG. 23 are executed in parallel.

  The operation of the control device 23 at the time of operation of the motor assembly 100 will be described with reference to FIG. While the motor assembly 100 is in automatic operation, the control device 23 repeatedly executes the flowchart of FIG. 20 at an arbitrary cycle (timing).

  First, when the motor assembly 100 is stopped (step S201: NO), the control device 23 temporarily exits the flowchart of FIG. 20 as an abnormal vibration occurrence flag = 0 (step S210) which will be described in detail later. When the motor assembly 100 is in operation (step S201), the control device 23 acquires the vibration sent from the vibration sensor at an arbitrary cycle (timing) (step S202). Thereafter, the control device 23 analyzes the vibration sent from the vibration sensor (performs Fourier transform), and outputs vibration values (V1, V2) corresponding to the plurality of frequency bands (f1, f2, f3 ... fn). , V3... Vn) are obtained as measured vibration values (step S203).

  The control device 23 compares the measured vibration value for each frequency band of vibration with the threshold A and the threshold B (step S204), and at least one of the compared measured vibration values is greater than the threshold A Is also larger than the threshold value B (step S205: YES), it is determined that abnormal vibration is occurring in the motor assembly 100 (at least one of the motor unit 10 and the inverter unit 20), and an abnormal vibration occurrence flag Is set to the value 1 (step S206). At this time, the control device 23 may execute the flowcharts of FIG. 8, FIG. 11, FIG. 14 and FIG. 17 described above to identify the cause of the abnormal vibration of the components of the motor assembly 100. The abnormal vibration occurrence flag is a flag which is set to a value 1 at threshold A <measured vibration value <threshold B, and when power of control device 23 is turned on, when motor 3 is stopped, and threshold A It is initialized to the value 0 at the timing of ≧ measurement vibration value etc.

  When step S205 of FIG. 20 is "NO", the control device 23 compares the measured vibration value for each frequency band of vibration with the threshold value B (step S207). The control device 23 stops the operation of the motor assembly 100 when at least one of the compared measured vibration values is equal to or greater than the threshold B (step S208: YES) (step S209). In this case, the control device 23 may output error information to the outside simultaneously with the stop of the motor 3, that is, an alarm may be issued on the operation panel 66 and the external terminal 63. Thereafter, the control device 23 clears the abnormal vibration occurrence flag (step S210).

  If all the measured vibration values compared are less than the threshold B (step S208: NO), the control device 23 determines that all measured vibration values are within the normal value (measured vibration value ≦ threshold A). Then, the abnormal vibration occurrence flag is initialized to the value 0 (step S210).

  Next, the normal operation state S30 will be described with reference to FIG. The control device 23 starts the flowchart of FIG. 21 at the timing when the transition from the START state S01 of FIG. 19 to the normal operation state S30 is made. Here, the normal operation time of the pump device 200 refers to a state in which the pump 50 performs a pumping operation at a specified point. In the normal operation state S30, as shown in step S301 of FIG. 21, the control device 23 determines the rotational speed F of the motor 3 to be the normal rotational speed F0 which is an arbitrary rotational speed, and sets the motor 3 at the normal rotational speed F0. To drive. The normal rotation speed F0 is the rotation speed (normal rotation speed) of the motor 3 during the normal operation of the motor assembly 100. In one embodiment, the normal rotational speed F0 is the rotational speed at a specified point which is the intersection of the specified head and the specified discharge shown in the performance curve of the pump 50.

  In the normal operation state S30, as an example of the control method of the normal rotational speed F0 of the pump 50 by the control device 23, the rotation of the pump 50 is made to set the target pressure of the discharge pressure of the pump 50 to a predetermined set pressure. Constant discharge pressure control to control the speed, estimated constant end pressure control to control the rotational speed of the pump 50 so that the pressure at the end of the water supply destination becomes a predetermined set pressure, the value of the current sensor (not shown) has a predetermined value Constant current control for controlling the rotational speed of the pump 50 to achieve the above, constant flow control for controlling the rotational speed of the pump 50 such that the flow rate of the flow rate sensor 72 becomes a predetermined value, The rotation speed constant control which controls the rotation speed of the pump 50 so that it becomes is mentioned.

  Next, in step S302, it is determined whether the abnormal vibration occurrence flag has a value of one. If the abnormal vibration occurrence flag is set to the value 1 in step S206 of FIG. 20 (step S302: YES), the process proceeds to the first vibration suppression operation of FIG. 22 (step S40) and the abnormal vibration occurrence flag has the value 0 (zero) If it is step S302: NO), it will return to step S301 and will continue normal driving | running state step S30.

  The first vibration suppression operation state S40 will be described with reference to FIG. In the first vibration suppression operation of FIG. 22, the rotation speed F of the motor 3 is operated at a first rotation speed F1 different from the normal rotation speed F0. The value of the first rotation speed F1 may be any value. In one embodiment, the value of the first rotation speed F1 may be a value obtained by adding, subtracting, or multiplying an arbitrary value to the value of the normal rotation speed F0. In another embodiment, the value of the first rotational speed F1 may be changed according to the first drive number CN1 indicating the number of times the motor 3 is driven at the first rotational speed F1. In addition, if the “vibration abnormal area” is stored in the test operation S10 of the pump 50, the target pressure or the first rotational speed F1 may be set so as to avoid the “vibration abnormal area”, or the rotational speed If the reference vibration value for each cycle is stored in the storage unit 60, the first rotation speed F1 may be set so as to avoid a large rotation speed of the reference vibration value.

  First, when the normal operation state S30 is shifted to the first vibration suppression operation state S40, as shown in step S401 of FIG. 22, the control device 23 confirms the count number of the first drive number CN1, and this count number exists. If it does, the count number of the drive number CN1 is cleared. Next, the control device 23 determines the rotational speed F of the motor 3 as the first rotational speed F1 (see step S402 in FIG. 22), and the motor 3 at the first rotational speed F1 for a predetermined time T10 (step S403: NO). After the operation during step b) (step S403: YES), the rotational speed F of the motor 3 is changed again to the normal rotational speed F0 (see step S404).

  Thereafter, the controller 23 operates the motor 3 at the normal rotation speed F0 for a predetermined time T11 (step S405: NO) (step S405 in FIG. 22: YES), and then the abnormal vibration occurrence flag has a value of 1 or not (Step S406). Here, the times T10 and T11 may be the same or different.

  If the abnormal vibration occurrence flag is set to the value 1 at step S206 in FIG. 20 (see step S406: YES), the control device 23 adds 1 to the first drive number CN1 (step S407). The count number of the first drive number CN1 is stored in the storage unit 60 of the control device 23. If the first drive number CN1 is larger than the predetermined number (see “YES” in step S408 in FIG. 22), that is, if the first vibration suppression operation is continuously performed a predetermined number of times, the control device 23 The control device 23 shifts to the second vibration suppression operation state S50 of FIG. 23 (see step S50 of FIG. 22).

  Here, if the abnormal vibration occurrence flag is the value 0 at step S406 in FIG. 22 (if it is not set to the value 1 at step S206 in FIG. 20) step S406 is NO, and the normal operation state S30 in FIG. It transfers to (step S30).

  The second vibration suppression operation state S50 will be described with reference to FIG. In the second vibration suppression operation state S50 of FIG. 23, the rotational speed F of the motor 3 is changed to the normal rotational speed F0 and the second rotational speed F2 different from the first rotational speed F1 for operation. The value of the second rotational speed F2 may be any value. In one embodiment, the value of the second rotational speed F2 may be the value of the normal rotational speed F0 or the value of the first rotational speed F1 plus, minus, or multiplied by an arbitrary value. In another embodiment, the value of the second rotational speed F2 may change in accordance with the second drive number CN2 indicating the number of times the motor 3 is driven at the second rotational speed F2. Further, the second rotation speed F2 may be set based on the vibration during the test operation S10 of the pump 50 or the reference vibration value as in the first rotation speed F1.

  As shown in step S501 in FIG. 23, the control device 23 determines the rotational speed F of the motor 3 to an arbitrary second rotational speed F2, and the motor 3 at the second rotational speed F2 for a predetermined time T20 (step S502: After the operation (step S502: YES), it is determined whether the value of the abnormal vibration occurrence flag is 1 or not.

  When the value of the abnormal vibration occurrence flag is 1 (set to the value 1 at step S206 in FIG. 20) (step S503: YES), the control device 23 adds 1 to the second drive frequency CN2 (step S504). The count number of the second drive number CN2 is stored in the storage unit 60 of the control device 23.

  The control device 23 outputs the error information to the outside when the second drive number CN2 is larger than the predetermined number (step S506: YES), that is, when the second vibration suppression operation is continuously performed a predetermined number of times. That is, an alarm is issued (step S507). Thereafter, the controller 23 operates the motor assembly 100 in a state in which the rotational speed F of the motor 3 is determined to the second rotational speed F2 until the alarm is reset (step S508: NO) (step S508). . When the alarm is reset (step S508: YES), the control device 23 returns the operation of the motor assembly 100 to the normal operation state S30 of FIG.

  Here, the description returns to step S503. If the value of the abnormal vibration occurrence flag is 0 in step S503 (see "NO" in step S503 in FIG. 23), the count number of the second drive frequency CN2 is cleared (step S505), and step S501 in FIG. Run. It can be considered that the abnormal vibration is suppressed by changing the rotational speed F of the motor 3 to the second rotational speed F2 when the step S503 is NO. Therefore, even if NO in step S503, the rotational speed F of the motor 3 is maintained at the normal rotational speed F0 or the first rotational speed by continuing the operation of the pump 50 with the rotational speed F of the motor 3 remaining at the second rotational speed F2. Water supply can be continued more reliably than returning to speed F1. Further, when the second drive number CN2 is equal to or less than the predetermined number (step S506: NO), the control device 23 executes step S501 of FIG. 23 again to avoid the alert notification.

  As described above, by performing the first vibration suppression operation and the second vibration suppression operation, it is possible to prevent the measured vibration value from being greater than or equal to the threshold value B and causing the pump 50 to stop due to vibration abnormality.

  As described above, in the embodiment described above, the vibration restraining operation in the case where abnormal vibration occurs in the motor assembly 100 has been described, but the control device 23 performs the vibration restraining operation even when abnormal vibration occurs in the pump 50. Can be performed.

(Example 2)
In the first embodiment described above, the test operation in a state where the valve 75 on the discharge side of the pump 50 is fully closed has been described, but in the following embodiment, the operation of the pump 50 in the state where the valve 75 is open The test operation will be described. In the following embodiments, descriptions of the same methods and configurations as the above-described embodiments may be omitted.

  In the present embodiment, the controller 23 gradually increases the rotational speed of the motor 3 with the valve 75 open so that the pump 50 is operated at the highest efficiency point or at a specified point. At this time, based on the flow rate detected by the flow rate sensor 72, a flow rate value (measured flow rate value) corresponding to the rotational speed in each stage may be acquired.

  An operation flowchart in the test operation mode of the present embodiment will be described with reference to FIG. First, the user prepares to start the test operation. In the present embodiment, first, in step S101, the user adjusts the opening degree of the valve 75 so that the pump 50 is operated at the highest efficiency point or the specified point. Further, the user turns on the power of the pump device 200 and prepares to switch to the test operation mode (see step S101 in FIG. 5). Next, a test operation of the pump device 200 is started with an operation or the like by the user as a trigger (see step S102 in FIG. 5).

  The control device 23 raises the rotational speed of the motor 3 stepwise to a predetermined rotational speed (for example, rated rotational speed), and acquires a vibration value (measurement vibration value) corresponding to the rotational speed in each step (FIG. 5) Step S103)). In one embodiment, the controller 23 raises the frequency of the inverter 22 stepwise (0 Hz, 5 Hz, 10 Hz,... 45 Hz, 50 Hz) at intervals of 5 Hz from 0 Hz to the maximum frequency (for example, 50 Hz). . Alternatively, the rotational speed of the motor 3 may be increased stepwise by controlling the rotational speed of the motor 3 such that the target pressure is increased stepwise and the discharge pressure of the pump 50 becomes the target pressure. . In the frequency in each step, the measured vibration value after waiting for a predetermined time (for example, about 10 seconds) until the frequency and the discharge pressure are stabilized is stored in the storage unit 60.

  Also in this embodiment, it is preferable to store the measured vibration value for each vibration sensor in the storage tables Tbl1, Tbl2, Tbl3 and Tbl4 shown in FIG.

  Further, when excessive vibration occurs at a specific rotational speed during the test operation of the pump 50, the control device 23 controls the rotational speed, the discharge flow rate at the rotational speed, and the like in the first embodiment. At least one of the discharge pressure at the time of the rotational speed may be stored in the storage unit 60 as a “vibration abnormal area”.

  The control device 23 may further acquire and store the discharge pressure and the discharge flow rate corresponding to the rotational speed at each stage. Then, the control device 23 can associate the discharge pressure and the discharge flow rate with the vibration value, and can specify the vibration caused by the flow rate acting on the pump 50. When the pump device 200 is, for example, a booster pump for a direct connection water supply device and the suction pressure fluctuates, the storage tables Tbl1, Tbl2, Tbl3 and Tbl4 further have suction pressures corresponding to rotational speeds in respective stages. You may memorize. In this case, a pressure value obtained by subtracting the suction pressure from the discharge pressure may be stored.

  Next, when the measurement of the measured vibration value is finished up to a predetermined rotational speed in step S103 of FIG. 5, the test operation mode of the pump device 200 is ended using the operation by the user as a trigger, and the test operation of the pump device 200 is ended. (See step S104 in FIG. 5). Since the measured vibration values of the storage tables Tbl1 to Tbl4 stored in step S103 are vibration values of the pump device at the normal time, the control device 23 selects the pump device 200 based on the measured vibration values of the storage tables Tbl1 to Tbl4. Abnormal vibration can be detected.

  Since the discharge flow rate of the pump 50 is proportional to the rotational speed, the controller 23 can associate the discharge flow rate of the pump 50 with the vibration value, and as a result, the flow rate of the fluid transported by the pump device 200 results. Measurement vibration value can be obtained.

  As in the first embodiment, the control device 23 may detect a vibration abnormality based on the measured vibration value. Further, as the flow rate of the fluid transferred by the pump device 200 increases, the vibration generated in the pump device 200 may increase. Therefore, as the flow rate of the fluid increases, the measured vibration values of the storage tables Tb11 to Tb13 are obtained. A numerical value to be added or multiplied (a numerical value indicating a predetermined ratio to each measured vibration value of the storage tables Tbl1 to Tbl3) may be increased.

  According to the present embodiment, at least one measured vibration value of the first motor-side vibration sensor 31, the second motor-side vibration sensor 35, the inverter-side vibration sensor 36, and the pump-side vibration sensor 56, and the control device 23 By comparing the means with a threshold value obtained by the same means, the occurrence of abnormal vibration of the components of the pump device 200 can be determined more accurately.

  In the embodiment described above, the method of correcting the threshold value that is the reference of abnormal vibration of the pump device 200 has been described, but the method of correcting the threshold value is also applied to the motor assembly 100 (see FIG. 1) can do.

(Modification)
In the above-described first and second embodiments, storage of the measured vibration values in the storage tables Tb11 to Tbl4 is performed in the test operation mode of the control device 23. Instead of this, the manual operation of the pump 50 is performed. The measured vibration value may be stored in An example of the operation panel 66 of the pump device 200 of this modification is shown in FIG. The operation panel 66 displays a variety of information in the storage unit 60. A display switching button 661 for switching the display contents of the 7-segment LED 660 and 7-segment LED 660 of multiple digits (here, 4 digits), and a setting button 662 for determining a user's setting change , Add up 7 Segment LED 660 value and display item Up button 663, Down subtraction button 7 64 7 Segment LED 660 value and display item, Manual operation button 665 to select the manual operation of the pump 50, Automatic operation of the pump 50 It has an automatic operation button 666 to select and an operation selection switch 667 to select whether the pump 50 can be operated. The operation panel 66 may be configured by a touch panel liquid crystal display or the like as long as each function described later is satisfied.

  The operation panel 66 has means capable of inputting the rotational speed of the pump 50 by the manual operation of the user, and the frequency of the inverter 22 is arbitrarily set from 0 Hz to the maximum frequency (for example, 50 Hz) by the manual operation. Can. Specifically, with the manual operation button 665 pressed, manual operation is selected, and the operation selection switch 667 is operable, the pump 50 displayed on the 7-segment LED 660 with the up button 663 or the down button 664 The user can arbitrarily set the rotational speed of the pump 50 by adding or subtracting the rotational speeds of

  In addition, the operation panel 66 and the external terminal 63 may display the rotational speed of the pump 50 and the current value of the measured vibration value. Specifically, when the user presses the display switching button 661, the 7-segment LED 660 displays the rotational speed of the pump 50 and the current value of the measured vibration value. Further, the operation panel 66 has setting means for inputting the measured vibration value and setting the input measured vibration value in the storage tables Tbl1 to Tbl4. Specifically, the measurement vibration value to be input is selected by the display switching button 661 and displayed on the 7-segment LED 660, the value of the measurement vibration value to be set is input by the up button 663 or the down button 664, and the setting button is pressed. By doing this, it is preferable that the user can set the values of the input measured vibration values in the storage tables Tbl1 to Tbl4.

  In the present modification, after preparation of step S101 in FIG. 5, the user starts manual operation of the pump device 200 in step S102, and the rotational speed of the motor 3 is set to a predetermined rotational speed (for example, rated rotational speed) in step S103. And the user acquires a vibration value (measured vibration value) corresponding to the rotational speed in each step.

  In one embodiment, the user manually raises the frequency of the inverter 22 from 0 Hz to the maximum frequency (eg, 50 Hz) stepwise (0 Hz, 5 Hz, 10 Hz,... 45 Hz, 50 Hz) from 0 Hz to the maximum frequency Let Then, the user visually recognizes the measured vibration value of the frequency in each step from the operation panel 66 and the external terminal 63, and stores the measured vibration value in the storage tables Tbl1 to Tbl4 shown in FIG. Specifically, the control device 23 or the external terminal 63 may be provided with a "memory button" (not shown), and when the user operates the "memory button", the measured vibration values may be stored in the memory tables Tbl1 to Tbl4. The user displays the measured vibration value for each step on the 7-segment LED 660, records the displayed measured vibration value on a paper medium, a storage medium, etc., and inputs the recorded measured vibration value from the operation panel 66 or an external terminal. It may be set in the storage tables Tbl1 to Tbl4. Alternatively, the measured vibration value at each step may be stored in a storage unit (not shown) of the external terminal 63, and the measured vibration value stored in the external terminal 63 may be written to the control device 23 by communication or the like.

  Next, when the measurement of the measured vibration value is completed up to a predetermined rotation speed in step S103 of FIG. 5, the user stops the pump and ends the test operation of the pump device 200 by the manual operation (step of FIG. 5) See S104). Note that after the test operation of the pump device 200 is ended, the user may store the measured vibration values of the storage tables Tbl1 to Tbl4 acquired at S103.

  Also in this modification, the control device 23 measures at least one measured vibration value of the first motor-side vibration sensor 31, the second motor-side vibration sensor 35, the inverter-side vibration sensor 36, and the pump-side vibration sensor 56, and the storage table Tbl1. The occurrence of abnormal vibration of the components of the pump device 200 can be determined more accurately by comparing the threshold value obtained from Tbl4 by means similar to the above-described embodiment.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and, of course, may be implemented in various different forms within the scope of the technical idea thereof.

2 drive shaft 3 motor (motor)
DESCRIPTION OF SYMBOLS 4 motor casing 4a bearing support part 4b bearing support part 8 cooling fan 10 motor part 19 sealing part 20 inverter part 21 and 25 bearing 22 inverter 22a through hole 23 control apparatus 24 inverter housing 31 1st motor side vibration sensor 35 2nd motor Side vibration sensor 36 inverter side vibration sensor 50 pump 51 coupling 52 rotating shaft 53 impeller 54 pump casing 54a bearing support portion 55 bearing 56 pump side vibration sensor 60 storage portion 61 operation portion 62 timer 63 external terminal 64 external communication portion 65 Output part 66 Operation panel 70 Inflow pipe 71 Discharge pipe 72 Flow sensor (flow detector)
73, 74 Pressure sensor (pressure detector)
75 valve 100 motor assembly 200 pump device 210 pump equipment

Claims (15)

Motor,
An inverter which is variable speed means of the motor;
A controller for controlling the motor;
A motor assembly comprising:
The motor assembly is
A first bearing, disposed on the opposite load side of the motor, for rotatably supporting the drive shaft of the motor;
A second bearing disposed on the load side of the motor and rotatably supporting the drive shaft;
Have,
A first motor-side vibration sensor that detects vibration of the first bearing;
A second motor-side vibration sensor that detects vibration of the second bearing;
An inverter-side vibration sensor that detects the vibration of the inverter;
And have
The controller is
A motor assembly characterized in that abnormal vibration is detected based on respective values detected by the first motor side vibration sensor, the second motor side vibration sensor, and the inverter side vibration sensor. The controller is
The vibration level for each frequency band of each value detected by the first motor side vibration sensor, the second motor side vibration sensor, and the inverter side vibration sensor is calculated and stored as a measured vibration value in the storage unit,
Having at least one predetermined threshold value to be compared to at least one of the vibration levels;
A state in which the vibration level of the measured vibration value is less than or equal to the threshold is referred to as a first state, and a state in which the vibration level of the measured vibration value is greater than the threshold is referred to as a second state.
The controller is
The motor assembly according to claim 1, wherein when the at least one vibration level is the second state, the abnormal vibration is detected, and the cause of the abnormal vibration is specified based on the measured vibration value. .   The inverter-side vibration sensor is in the first state, the first motor-side vibration sensor is in the second state, and the second motor-side vibration sensor is in the second state, and further, the first motor-side vibration sensor The motor set according to claim 2, wherein when the frequency band in the abnormal vibration detected by the second motor-side vibration sensor is the same, it is determined that the drive shaft is abnormal. Three-dimensional. The controller is
When the inverter-side vibration sensor is in the first state, the first motor-side vibration sensor is in the second state, and the second motor-side vibration sensor is in the first state, the first bearing has an abnormality Judging that is occurring,
When the inverter-side vibration sensor is in the first state, the first motor-side vibration sensor is in the first state, and the second motor-side vibration sensor is in the second state, the second bearing has an abnormality The motor assembly according to claim 2 or 3, wherein it is determined that the following occurs.   When the inverter-side vibration sensor is in the second state, the first motor-side vibration sensor is in the first state, and the second motor-side vibration sensor is in the first state, the control device operates the inverter. The motor assembly according to any one of claims 2 to 4, wherein it is determined that an abnormality has occurred in the inverter unit provided.   When the control device is such that the inverter-side vibration sensor is in the second state, the first motor-side vibration sensor is in the second state, and the second motor-side vibration sensor is in the second state The motor assembly according to any one of claims 2 to 5, wherein it is determined that an abnormality has occurred in a housing of the motor assembly. The controller is
When the inverter-side vibration sensor is in the second state, the first motor-side vibration sensor is in the first state, and the second motor-side vibration sensor is in the first state, an alarm is issued. The motor assembly according to any one of claims 2 to 6, wherein the operation of the motor is continued. The storage unit includes a storage table for storing the measured vibration value at each stage in which the rotational speed of the motor is increased stepwise to a predetermined rotational speed,
The controller is
Storing the measured vibration value at each stage where the rotational speed of the motor is stepwise increased to a predetermined rotational speed in the test operation as a test measured vibration value in the storage table;
The threshold value is determined by adding or multiplying a numerical value indicating a predetermined ratio to the test measurement vibration value, or
The average value, the maximum value, or the minimum value of the test measurement vibration values is calculated as a representative value, and the representative value is added or multiplied by a predetermined value to determine the threshold value, or
The correction value which is the difference between the test measurement vibration value and a predetermined reference vibration value is calculated, and the threshold value is determined based on the calculated correction amount. A motor assembly according to item 1. The threshold includes a first threshold and a second threshold greater than the first threshold,
The controller is
When at least one of the measured vibration values of the first motor-side vibration sensor, the second motor-side vibration sensor, and the inverter-side vibration sensor is greater than or equal to the second threshold value, the operation of the motor is stopped. A motor assembly according to any one of claims 2 to 8, characterized in that. The motor assembly is
A motor casing having a first bearing support that houses the motor and supports the first bearing and a second bearing support that supports the second bearing;
And an inverter housing for housing the inverter.
The first motor side vibration sensor is attached to the first bearing support portion,
The second motor side vibration sensor is attached to the second bearing support portion,
The motor assembly according to any one of claims 1 to 9, wherein the inverter-side vibration sensor is attached to the inner surface of the inverter or the inverter housing.   11. The motor assembly according to claim 10, wherein the drive shaft passes through a through hole of the inverter.   The motor assembly according to any one of claims 1 to 11, wherein the control device executes a vibration suppression operation to change a rotational speed of the motor based on the detection of the abnormal vibration.   A pump apparatus comprising a pump driven by the motor assembly according to any one of claims 1 to 12. A method of identifying abnormal vibration of a motor assembly comprising a motor and an inverter which is variable speed means of the motor, comprising:
A first motor-side vibration sensor for detecting a vibration of a first bearing rotatably supporting a drive shaft of the motor, a second bearing provided at the target position with the first bearing and rotatably supporting the drive shaft A method of identifying an abnormal vibration, comprising: identifying a second vibration based on respective values detected by a second motor-side vibration sensor for detecting a vibration and an inverter-side vibration sensor for detecting a vibration of the inverter. The vibration level for each frequency band of each value detected by the first motor-side vibration sensor, the second motor-side vibration sensor, and the inverter-side vibration sensor is calculated to be a measured vibration value.
The first state where the vibration level of the measured vibration value is at least one predetermined threshold value to be compared with at least one of the vibration levels is a first state, and the vibration level of the measured vibration value is greater than the threshold value The second state,
The method according to claim 14, wherein when the at least one vibration level is the second state, an abnormal vibration is specified, and a cause of the abnormal vibration is specified based on the measured vibration value.

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