JP2003018797A - Operation monitor for canned motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation monitor for a canned motor by making the meter unit 45 compact thereby containing it in the terminal box of the canned motor. SOLUTION: The meter unit 45 is provided with a signal processing circuit 26 for processing the output signals of detecting units 24, 25 and a rectifier circuit 30 of a DC low voltage power unit 28 for driving the signal processing circuit 26. A control board 22 installed on a place isolated from the canned motor 21 is provided with an AC low voltage power unit 28. The rectifier circuit 30 is connected to the AC low voltage power unit 32 with a low voltage power line 66. Since the meter unit 45 is made small-sized and installed in the terminal box located apart from a terminal cover, the furnishing a wiring to the terminal box is simplified, enabling the same meter unit 45 to be used with various sized terminal boxes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canned motor operation monitoring device for monitoring the operating state of a canned motor.

[0002]

2. Description of the Related Art Generally, a canned motor is mainly used for driving a pump or a stirrer, and is also used in a chemical plant, for example, and is therefore required to have high reliability.

In the case of a canned motor pump which employs a canned motor, the canned motor and the pump have a structure in which there is no liquid leakage, and the internal condition cannot be visually observed.

The rotor of the canned motor for rotating the impeller of the pump is almost always supported by a slide bearing which is lubricated with a pump liquid, but in order to effectively operate the canned motor, the slide bearing is required. It is necessary to externally monitor the wear state of.

As a device for detecting the wear of the plain bearing, for example, as described in Japanese Patent Application Laid-Open No. 10-80103, a detecting coil is provided in a stator of a canned motor, and a bearing is detected by a signal of the detecting coil. Operation monitoring devices are known for detecting radial wear and axial wear of a.

In the operation monitoring device for detecting such bearing wear, a signal processing circuit for outputting the output signal of the detection coil as a signal corresponding to the wear state of the bearing to an indicator such as a voltmeter or an LED bar graph. , A power supply transformer and a rectifier circuit for obtaining a DC power supply for driving the signal processing circuit and the instruction unit from a motor drive power supply, and the signal processing circuit, the instruction unit, the power transformer and the rectifier circuit are substantially cylindrical. It is integrally mounted in the formed terminal cover.

By the way, in this operation monitoring device,
To connect the motor drive power cable and the external output signal line of the operation monitoring device to the canned motor, it is necessary to remove the terminal cover that is attached to the terminal box. Wiring work, such as removing the input signal line to or to the output signal line from the signal processing circuit from the terminal board, or if not removing it, one person supports the terminal cover with one hand and the other person works. There is a problem that the property is extremely poor.

Therefore, in order to solve this problem, for example, there is a proposal described in Japanese Patent Laid-Open No. 10-336971.

That is, as shown in FIGS.
The terminal cover 3 attached to the terminal box 2 of the canned motor 1 is formed in a cup shape, and the signal processing circuit 4, the indicator 5, the power transformer 6, and a rectifier circuit (not shown) are integrally housed in the terminal cover 3. The plate unit 7 is closed and fixed to form the meter unit 8 of the canned motor operation monitoring device that also serves as the terminal cover 3 as the meter unit case.

A terminal board 9 is provided in the terminal box 2 to which the terminal cover 3 is attached, and an input / output signal line 10 connected to the signal processing circuit 4 of the meter unit 8 is connected to the terminal board 9. Further, during wiring work at the site where the canned motor is installed, the motor drive power cable 11, the thermostat lead wire 12 for monitoring the temperature abnormality of the motor winding of the canned motor, and the meter unit 8 are not shown. Connect the external output signal line.

The terminal cover 3 has a plurality of bolts for the terminal box 2.
It is fastened and fixed at 13. The terminal box 2 has a pin 14 for locking the terminal lid.
Is erected, and the terminal lid 3 is attached to the terminal lid locking pin 14.
Can be engaged in a regular mounted state or in a face-down state.

During the wiring work on site, the terminal cover 3 is removed from the terminal box 2, and the removed terminal cover 3 is removed.
With the connection state of the input / output signal line 10 turned to the rear side, and engaged with the terminal lid locking pin 14 provided upright from the terminal box 2,
Hold it in the terminal box 2. In this state, the motor drive power cable 11, the lead wire 12 and the meter unit 8 to the terminal plate 9 can be connected to the terminal plate 9 without disconnecting the terminal plate 9 from the input / output signal line 10 or supporting the terminal cover 3 by hand. Wiring work for external output signal lines is possible.

[0013]

However, since the signal processing circuit 4, the instruction unit 5, the power supply transformer 6 and the rectifying circuit (not shown) are integrally housed in the terminal cover 3, the configuration of the canned motor operation monitoring device is considered. However, since the power transformer 6 that occupies a particularly large volume and mass is accommodated, the meter unit 8 becomes large and heavy, and there is a problem that the workability of wiring work after the terminal cover 3 is removed from the terminal box 2 is impaired.

Further, the terminal cover 3 is removed from the terminal box 2 and turned to the back side, and is engaged with the terminal cover locking pin 14 so that the terminal box 2 is closed.
Since the work to hold at is in a state where the input / output signal line 10 is connected, the work is difficult if the input / output signal line 10 is short,
If the input / output signal line 10 is long, the work will be easier, but when the terminal cover 3 is mounted on the terminal box 2 in a normal state, the input / output signal line 10
Must be rolled into the terminal box 2 and stored, and the work is troublesome, and the input / output signal line 10 is used for the terminal box 2 and the terminal cover 3.
There is a risk that it will be pinched in the fitting portion with and cause a defect. Further, there is a possibility that the thin input / output signal line 10 may be inadvertently cut during the work of connecting the electric wires to the terminal board 9, particularly the work of connecting the thick motor drive power cable 11.

Furthermore, when the terminal cover 3 is held in the terminal box 2 face down or when the terminal cover 3 is accidentally dropped when assembled in a normal state, the weight of the terminal cover 3 causes a thin input / output signal. The line 10 may be cut.

Further, when the size of the terminal box 2 changes according to the capacity of the canned motor 1, the structure and dimensions of the terminal cover 3 also change. Therefore, in the canned motor 1 having an explosion-proof structure, a meter is provided separately from the terminal box 2. Explosion proof certification of the terminal cover 3 as a room for accommodating the unit 8 is newly required, which is very troublesome and costly.

Such a problem is caused by the fact that the meter unit 8 is attached to the terminal cover 3, but the meter unit 8 is large because it has the power transformer 6 with a large volume integrally, and the terminal box 2 Since there is no room to install this large-sized meter unit 8 in a place different from the terminal cover 3, the meter unit 8 is attached to the terminal cover 3.

The present invention has been made in view of the above circumstances, and provides a canned motor operation monitoring device capable of increasing the degree of freedom of the place provided on the canned motor side by miniaturizing the structure provided on the canned motor side. The purpose is to

[0019]

A canned motor operation monitoring device according to claim 1 is provided on the canned motor side,
A detection unit that detects a bearing wear state of the canned motor, a signal processing circuit that is provided on the canned motor side and that processes an output signal of the detection unit, and a signal processing circuit that is provided at a location separated from the canned motor It is provided with a DC low voltage power supply section for driving the processing circuit, and a low voltage power supply line connecting the DC low voltage power supply section and the signal processing circuit.

According to this structure, the canned motor is provided with the signal processing circuit for processing the output signal of the detection unit, and the DC low voltage power supply unit for driving the signal processing circuit is provided at a place separated from the canned motor. By connecting the signal processing circuit and the DC low-voltage power supply section with the low-voltage power supply line, the configuration provided on the canned motor side can be downsized, and the degree of freedom of the location provided on the canned motor side is increased. This allows
For example, it becomes possible to attach the canned motor operation monitoring device to the terminal box side without providing it to the terminal cover as in the conventional case, and the wiring work to the terminal box becomes easy, and at the same time, depending on the capacity of the canned motor, Even if the size changes, the same canned motor operation monitoring device can be used.

According to a second aspect of the present invention, there is provided a canned motor operation monitoring device which is provided on the canned motor side and which detects a bearing wear state of the canned motor and an output signal of the detected part which is provided on the canned motor side. Signal processing circuit for processing the AC low voltage power supply unit provided at a location separated from the canned motor, and the AC low voltage from the AC low voltage power supply unit provided on the canned motor side to rectify the DC low voltage. A rectifying circuit is provided, and a direct current low voltage power supply unit for driving the signal processing circuit and a low voltage power supply line connecting the alternating current low voltage power supply unit and the rectifying circuit are provided.

According to this construction, the canned motor side is provided with the signal processing circuit for processing the output signal of the detection part and the rectifying circuit of the direct current low voltage power supply part for driving the signal processing circuit, and the part is separated from the canned motor. By providing the AC low-voltage power supply section of the DC low-voltage power supply section and connecting these rectifier circuits and the AC low-voltage power supply section with the low-voltage power supply line, the configuration provided on the canned motor side can be made smaller and the canned motor side can be realized. The degree of freedom in the place of installation is increased. As a result, for example, it becomes possible to install the canned motor operation monitoring device on the terminal box side without providing it on the terminal lid as in the conventional case.
Wiring work to the terminal box becomes easy, and even if the size of the terminal box changes according to the capacity of the canned motor, the same canned motor operation monitoring device can be used. Moreover,
Since an AC voltage is applied to the low-voltage power supply line, even if the low-voltage power supply line becomes extremely long and a voltage drop occurs, the AC low voltage power supply unit As a result, the output voltage does not decrease, and the error in the indicated value due to the length of the low-voltage power supply line is reduced.

A canned motor operation monitoring device according to a third aspect of the present invention is the canned motor operation monitoring device according to the first or second aspect, in which the canned motor side is provided with a terminal box and a terminal cover detachably provided on the terminal box. And a meter unit that is provided in the terminal box at a position different from the terminal lid and that has a signal processing circuit and a meter unit having a command section for instructing an output signal of the signal processing circuit.

According to this structure, the canned motor side is provided with the meter unit having the signal processing circuit and the instruction section for instructing the output signal of the signal processing circuit at a position different from the terminal cover of the terminal box. Wiring work to the terminal box by opening and closing the terminal cover can be facilitated without affecting the meter unit, and the operation status can be monitored at the operation site of the canned motor.

A canned motor operation monitoring apparatus according to a fourth aspect is the canned motor operation monitoring apparatus according to any one of the first to third aspects, wherein an instruction unit for instructing an output signal of the signal processing circuit is separated from the canned motor. It is provided on the ground.

According to this structure, since the instruction unit for instructing the output signal of the signal processing circuit is provided at a remote place separated from the canned motor, the operating condition can be monitored at the place separated from the canned motor. .

A canned motor operation monitoring device according to a fifth aspect is the canned motor operation monitoring device according to any one of the first to fourth aspects, wherein a signal line for extracting an output signal of the signal processing circuit to the outside and a low-voltage power supply line are provided. It is provided on one multi-core cable.

According to this structure, the signal line for taking out the output signal of the signal processing circuit and the low-voltage power source line are provided in one multicore cable, so that the canned motor side and the canned motor are separated. The number of wires to and from the place is reduced, the number of cable glands is also reduced, and the wiring material cost and the wiring work cost are reduced.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a circuit diagram of a canned motor operation monitoring device, FIG. 2 is a sectional view of a terminal box to which the canned motor operation monitoring device is applied, and FIG. 3 is a state in which a terminal lid to which the canned motor operation monitoring device is applied is removed. It is a top view of a terminal box.

As shown in FIG. 1, reference numeral 21 denotes a canned motor, and a control board 22 for controlling the canned motor 21 is installed in a place separated from the canned motor 21. A bearing wear detection device 23 is provided as a canned motor operation monitoring device that monitors the operating state of the canned motor 21.

The bearing wear detecting device 23 includes a radial bearing wear detecting section 24 and an axial bearing wear detecting section 25 as a detecting section composed of a detecting coil and the like, the radial bearing wear detecting section 24 and the axial bearing wear detecting section 24. A signal processing circuit 26 for processing the output signal of the detection unit 25, a site instruction unit 27 as an instruction unit for instructing the output signal of the signal processing circuit 26, a signal processing circuit
DC low-voltage power supply unit 28 for driving 26, and signal processing circuit
It has a remote instruction section 29 as an instruction section for instructing the output signal of 26.

In the bearing wear detection device 23, on the canned motor 21 side, both bearing wear detection units 24 and 25, a signal processing circuit 26, a site instruction unit 27, and a rectifying circuit 30 of a DC low voltage power supply unit 28 are provided. The rectifier circuit 30 is provided with a regulator 31 for keeping the DC output voltage constant. On the other hand, on the control panel 22 side, the AC low voltage power supply 32 of the DC low voltage power supply unit 28
A power transformer 32a and a remote instruction unit 29 are arranged.

Further, the canned motor 21 is provided with a liquid level switch 33 for detecting that the handling liquid is full, and the liquid level switch 33 is arranged so as to face the canned motor 21, and the liquid level switch 33 is provided on the control panel 22 side.
Motor drive power supply control circuit that operates based on the detection of 33
Are arranged.

Then, as shown in FIGS. 2 and 3, the terminal receiving base 36 formed on the frame 35 of the canned motor 21 so as to project therefrom.
A terminal plate 37 is mounted on the terminal box 38, a terminal box 38 is mounted so as to cover the terminal plate 37, and the terminal box 38 and the terminal plate 37 are fastened and fixed to the terminal receiving base 36 by a plurality of bolts 39. Terminal box
A terminal cover 40 is removably attached to the upper opening of 38 with a plurality of bolts 41. A wire lead-in portion 42 is extended in the horizontal direction of the terminal box 38, and a meter unit 45 is mounted via a gasket 44 in a meter unit mounting hole 43 formed in the upper surface of the wire lead-in portion 42. 45 is fastened and fixed to the wire lead-in portion 42 by a plurality of bolts 46. With these configurations, the terminal box portion of the canned motor 21 is configured.

The meter unit 45 includes a bearing wear detector 23.
Of the signal processing circuit 26 and the rectifying circuit 30 of the DC low-voltage power supply unit 28, and the printed circuit board 48 and the scale plate 49 on which the field indicator 27 such as an LED bar graph is mounted.
Are sequentially assembled to cover the meter case 52 in which the window glass 51 is incorporated in the upper opening, and the meter case 50 and the meter case 52 are fastened and fixed with bolts 53. .

The signal lines 55 of the bearing wear detectors 24 and 25 mounted in the stator 54 of the canned motor 21 are connected to the stator 54 side of the signal terminal 56 of the terminal plate 37, and the terminals of the signal terminal 56 are connected. The box 38 side is connected to the input side of the signal processing circuit 26 by a signal line 57, the signal processing circuit 26, the site indicator 27 and the rectifier circuit 30 are connected in the meter unit 45, and the output side of the signal processing circuit 26 The signal line 58 is the relay terminal 59 of the terminal board 37.
The power line 60 of the rectifier circuit 30 is connected to the relay terminal 59 of the terminal plate 37. The signal lines 57 and 58 and the power supply line 60 are combined into one multi-core cable 61, and this multi-core cable 61 penetrates the meter base 50 and is guided from the meter unit 45 into the terminal box 38. There is.

Further, the lead wire 62 of the liquid level switch 33 is guided into the terminal box 38 through a conduit tube (not shown) and connected to the relay terminal 63 of the terminal plate 37, and the liquid level switch is connected via this relay terminal 63. 33 and the control panel 22 side are connected by a lead wire 64. Furthermore, the signal processing circuit 26 and the remote instruction unit 29 are connected by the signal line 65 via the relay terminal 59, and
The rectifier circuit 30 and the secondary side (several V to several tens of V) of the power transformer 32a are connected to each other via a relay terminal 59 by a low voltage power line 66. Each signal line 65, low voltage power line 66 and lead line 64
Are bundled into one multi-core cable 67, and this multi-core cable 67 is led out from the inside of the terminal box 38 to the control panel 22 side via a cable gland 68 or the like in order to maintain the explosion-proof structure.

On the control panel 22 side, a rectifier circuit 69 connected to the secondary side of the power transformer 32a is provided as a power source for the remote instruction section 29. The rectifier circuit 69 also has a DC output voltage. A regulator 70 that keeps the constant is provided.

The power supply R / S / T of the canned motor 21 is connected to the motor power cable 72 via the electromagnetic switch 71 on the control panel 22 side.
Is guided to the inside of the terminal box 38 while maintaining the explosion-proof structure by the cable gland 73 and connected to the motor power supply terminal 74.

When the liquid level switch 33 detects that the liquid to be handled is not filled in the canned motor 21,
And the winding temperature of the canned motor 21 is 75
A motor power supply control circuit 34 that cuts off the electromagnetic switch 71 to cut off the power supply to the canned motor 21 when the temperature exceeds the set temperature is provided in the control panel 22.
A canned motor power supply R / S / T or a power supply dedicated to the control panel 22 is connected to the primary side of the secondary side to supply an AC low voltage of several V to several tens of V to the secondary side. The lead wire 76 is led from the terminal box 38 to the control panel 22 side via a cable gland 77 or the like.

Bearing wear detection device 23 configured as described above
According to this, the power supply transformer 32a as the AC low voltage power supply 32 and the rectifying circuit 3 for driving the signal processing circuit 26, the site instruction unit 27 and the remote instruction unit 29 of the bearing wear detection device 23.
Of the DC low-voltage power supply unit 28 having 0 and 69, a power supply transformer 32a that occupies a particularly large volume among the electric elements of the bearing wear detection device 23 is installed on the side of the control panel 22 that is remote from the canned motor 21. Therefore, it is not necessary to store the power transformer 32a in the meter unit 45 as in the conventional example.

Therefore, the size of the meter unit 45 can be reduced, and the meter unit 45 can be mounted in the meter unit mounting hole 43 provided in the wire lead-in portion 42 of the terminal box 38.
The same meter unit 45 can be used even if the dimensions of
Every time the dimension of the terminal box 38 changes according to the capacity of the canned motor 21 as in the conventional example in which the meter unit 45 is integrally provided on the terminal lid 40 part, the structure and dimensions of the terminal lid 40 forming the meter unit 45 are changed. It is extremely economical because there is no need to take a new explosion-proof test.

Further, the work of connecting the motor power cable 72 and the multi-core cable 67 of the bearing wear detection device 23 to the terminal plate 37 is carried out by connecting the terminal cover 40 to the power supply line 60 of the bearing wear detection device 23 and the signal as in the conventional example. Since the lines 57 and 58 are not connected, the terminal cover
It is not necessary to remove 40 and hold it in the terminal box 38 with the lid locking pin, so that the terminal lid 40 can be easily attached and removed, and the power line 60 and the signal lines 57 and 58 of the bearing wear detector 23 can be easily attached. There is no risk of biting or cutting.

Further, since the rectifier circuits 30 and 69 are provided with the regulators 31 and 70 for keeping the DC output voltage constant,
Even if the voltage of the canned motor power supply R / S / T fluctuates, the voltage of the DC low-voltage power supply that drives the signal processing circuit 26, the site indicator 27 and the remote indicator 29 is kept constant, and the indicated value fluctuates. Can be prevented.

Even if the low-voltage power supply line 66 becomes extremely long and a voltage drop occurs, the AC voltage is set to a high value in consideration of the voltage drop, so that the output voltage of the DC low voltage on the canned motor 21 side is set. There is no decrease, and it is possible to prevent an error in the indicated value due to the length of the low-voltage power supply line 66.

In the above embodiment, the power transformer 32a of the DC low voltage power supply unit 28 is provided on the control panel 22 side, and the rectifier circuit 30 is provided.
Is provided in the meter unit 45 and an AC low voltage is applied from the power transformer 32a to the rectifier circuit 30 via the low voltage power line 66.
It may be provided on the side. However, in this case, if the low-voltage power supply line 66 becomes extremely long, the DC low voltage applied to the signal processing circuit 26 and the site instruction unit 27 may decrease due to a voltage drop, which may cause an error in the wear instruction value. The voltage power supply line 66 is preferably short.

Further, in the above-mentioned embodiment, the lead wire 62 of the liquid level switch 33 is drawn into the terminal box 38 and then led to the control panel 22 side. However, the lead wire of the thermostat 75 is connected via the electric wire connection box (not shown). The multi-core cable may be combined with 76, or the lead wire 76 of the thermostat 75 may be combined with the signal line 65 and the low-voltage power supply line 66 into a multi-core cable 67.

Further, either one of the site instruction unit 27 and the remote instruction unit 29 may be provided, or when the alarm device is provided, each instruction unit 27, 29 may be omitted.

[0050]

According to the canned motor operation monitoring device of the first aspect, a signal processing circuit for processing the output signal of the detection unit is provided on the canned motor side, and the signal processing circuit is driven at a location separated from the canned motor. Since the DC low voltage power supply unit is provided and the signal processing circuit and the DC low voltage power supply unit are connected by the low voltage power supply line, the configuration provided on the canned motor side can be miniaturized and the flexibility of the place provided on the canned motor side can be reduced. Can be increased. As a result, for example, it becomes possible to attach the canned motor operation monitoring device to the terminal box side without providing the canned motor operation monitoring device as in the conventional case, the wiring work to the terminal box can be facilitated, and the canned motor can be operated according to the capacity of the canned motor. Even if the size of the terminal box changes, the same canned motor operation monitoring device can be used.

According to the canned motor operation monitoring device of the second aspect, the canned motor side is provided with the signal processing circuit for processing the output signal of the detection part and the rectifying circuit of the DC low voltage power supply part for driving the signal processing circuit. Since the AC low-voltage power supply section of the DC low-voltage power supply section is provided in a place separated from the canned motor, and the rectifier circuit and the AC low-voltage power supply section are connected by the low-voltage power supply line, the configuration provided on the canned motor side is small. Therefore, it is possible to increase the degree of freedom of a place provided on the canned motor side. As a result, for example, it becomes possible to attach the canned motor operation monitoring device to the terminal box side without providing the canned motor operation monitoring device as in the conventional case, the wiring work to the terminal box can be facilitated, and the canned motor can be operated according to the capacity of the canned motor. Even if the size of the terminal box changes, the same canned motor operation monitoring device can be used. Moreover, since an AC voltage is applied to the low-voltage power supply line, even if the low-voltage power supply line becomes extremely long and a voltage drop occurs, by setting the AC voltage high in advance by anticipating the voltage drop, the DC low voltage The output voltage of the power supply unit does not decrease, and the error in the indicated value due to the length of the low voltage power supply line can be reduced.

According to the canned motor operation monitoring device of the third aspect, in addition to the effect of the canned motor operation monitoring device of the first or second aspect, a position different from the terminal cover of the terminal box on the canned motor side. Since the meter unit having the signal processing circuit and the instruction unit for instructing the output signal of the signal processing circuit is provided in the, the wiring work to the terminal box by opening and closing the terminal lid can be facilitated without affecting the meter unit. , The operation status can be monitored at the operation site of the canned motor.

According to the canned motor operation monitoring apparatus of the fourth aspect, in addition to the effect of the canned motor operation monitoring apparatus of any of the first to third aspects, an instruction unit for instructing the output signal of the signal processing circuit is cancelled. Since it is installed in a remote place separated from the motor, the operation status can be monitored in a place separated from the canned motor.

According to the canned motor operation monitoring device of the fifth aspect, in addition to the effect of the canned motor operation monitoring device of any of the first to fourth aspects, a signal line for extracting the output signal of the signal processing circuit to the outside is provided. Since the low-voltage power supply line is provided on one multi-core cable, the number of wires between the canned motor side and the place separated from the canned motor is reduced, and the number of cable glands is also reduced to reduce the wiring material cost and wiring work cost. Can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a canned motor operation monitoring device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a terminal box to which the above canned motor operation monitoring device is applied.

FIG. 3 is a plan view of the terminal box in which the terminal cover to which the canned motor operation monitoring device is applied is detached.

FIG. 4 is a cross-sectional view of a terminal box to which a conventional canned motor operation monitoring device is applied, viewed from a side direction.

FIG. 5 is a cross-sectional view of a terminal box to which a conventional canned motor operation monitoring device is applied, as seen from a plane direction.

FIG. 6 is a side view of a terminal box and a canned motor to which a conventional canned motor operation monitoring device is applied.

[Explanation of symbols]

21 canned motor 23 bearing wear detector as canned motor operation monitor 24 radial bearing wear detector 25 as detector 25 axial bearing wear detector 26 as detector 26 signal processing circuit 27 site indicator 28 as indicator DC low-voltage power supply section 30 Rectifier circuit 32 AC low-voltage power supply section 38 Terminal box 40 Terminal cover 45 Meter unit 65 Signal line 66 Low-voltage power supply line 67 Multi-core cable

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04D 29/60 H02K 5/22 H02K 5/22 11/00 Q F term (reference) 3H021 AA01 AA08 BA11 BA20 BA21 CA00 DA00 EA02 EA04 EA07 EA19 EA20 3H022 AA01 BA07 CA50 DA07 DA09 DA12 DA19 DA20 5H605 AA04 AA05 BB05 CC04 EB01 EB40 5H611 AA01 BB01 PP03 TT01 UA01 UA05

Claims (5)

[Claims] 1. A detection unit provided on the canned motor side for detecting a bearing wear state of the canned motor; a signal processing circuit provided on the canned motor side for processing an output signal of the detection unit; It is installed in a place separated from the motor side,
A canned motor operation monitoring device comprising: a DC low-voltage power supply unit that drives the signal processing circuit; and a low-voltage power supply line that connects the DC low-voltage power supply unit and the signal processing circuit. 2. A detector provided on the canned motor side to detect a bearing wear state of the canned motor; a signal processing circuit provided on the canned motor side to process an output signal of the detector; An AC low-voltage power supply unit provided in a location separated from the motor, and a rectifier circuit provided on the canned motor side for rectifying the AC low-voltage from the AC low-voltage power supply unit to a DC low voltage, and the signal processing circuit. A canned motor operation monitoring device comprising: a DC low-voltage power supply unit for driving the motor; and a low-voltage power supply line connecting the AC low-voltage power supply unit and a rectifier circuit. 3. The canned motor side has a terminal box, a terminal cover detachably mounted on the terminal box, and a signal processing circuit provided at the terminal box at a position different from the terminal cover and an output of the signal processing circuit. The canned motor operation monitoring device according to claim 1 or 2, further comprising a meter unit having an instruction unit for instructing a signal. 4. The canned motor operation monitoring device according to claim 1, wherein an instruction unit for instructing an output signal of the signal processing circuit is provided at a remote place separated from the canned motor. 5. The canned motor operation according to claim 1, wherein a signal line for extracting the output signal of the signal processing circuit to the outside and a low-voltage power source line are provided in one multicore cable. Monitoring equipment.