JPH10145960A - Power generator and electric washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage and damage due to burning by making an inverter stopping means stop an inverter circuit when a continuity detecting means detects wire breaking in any winding of a three-phase winding. SOLUTION: A control means 18 is provided with a continuity detecting means 23 and an inverter stopping means 25 which is operated on a signal of the continuity detecting means 23. When the connection terminal U of the first winding 14 is kept positive, the connection terminal V of the second winding 15 is kept zero, and the connection terminal W of the third winding 16 is opened by controlling an inverter 17, which constitutes a threephase winding, current is flowed through the first and the second windings 14, 15. In case of wire breaking of the first winding 14, current flowing through the three-phase winding 13 is reduced to decrease rotational speed and torque of a motor, therefore, the control means 18 controls the rotational speed with a microcomputer to increase current flowing through the second winding 15 and the third winding 16. The continuity detecting means 23 detects the magnitude of the inputted current. If the maximum value is in excess of a prescribed value, an ON signal is sent to the inverter stopping means 25. It is thus possible to prevent breakage and damage due to burning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator used for various types of consumer or industrial equipment, and an electric washing machine using the power generator.

[0002]

2. Description of the Related Art A conventional power generator will be described with reference to FIG. A conventional power generation device includes a motor 111
, An inverter circuit 112 for supplying a three-phase current to the electric motor 111, a DC power supply converter 113 for supplying power to the inverter circuit 112, and a commercial power supply 114.

Although the motor 111 is not particularly shown,
It comprises a first object 115 having a phase winding 116 and a second object driven by the first object 115. The three-phase winding 116 has one end connected to the terminal U, the terminal V, and the terminal W, and the other end connected to a neutral point. The second object is constituted by a rotor constituted by laminating silicon steel plates or the like, and a ring-shaped permanent magnet provided on the surface of the rotor.

[0004] The inverter circuit 112 includes first and second switching elements, third and fourth switching elements, and a fifth switching element.
-The sixth switching element is configured by connecting three series circuits in which two switching elements are connected in series and connected in parallel. IGBT is used for each switching element. The connection terminals U, V, and W of the three-phase winding 116 are connected to connection points of a series circuit of the switching elements. In other words, the terminal U connecting the three-phase winding 116 is determined by the combination of on / off of the two switching elements
-V / W is controlled to three states of positive voltage, zero voltage, and open. The turning on / off of the switching element is performed by control means 117 constituted by a microcomputer or the like.

[0005] The DC power converter 113 here comprises a diode bridge 118, a choke coil 119 and a smoothing capacitor 120. Also, I _in
This is the input current of the inverter circuit 112.

Hereinafter, the operation of the above-mentioned conventional configuration will be described. According to the instruction of the control means 117, the inverter circuit 112 is connected between the terminals U and V, between the terminals U and W, between the terminals V and W, between the terminals V and U, and between the terminals W and U.
Between the terminals W and V, and between the terminals U and V. As a result, current flows through each of the three-phase windings constituting the first object 115, and the first object 115
Generates a rotating magnetic field. Due to this rotating magnetic field, a force is generated in the second object according to the Fleming's left hand rule, and the electric motor 111 rotates.

FIG. 9 shows a three-phase current supplied to the three-phase winding 116 by the inverter circuit 112. Three-phase winding 11
6, the current flowing through one of the six conductors is i, the magnetic flux density of the permanent magnet provided on the surface of the second object is b, and the length of the conductor of the three-phase winding 116 facing the permanent magnet is l. Assuming that the force to be applied is f, f = bil, and the generated torque is f
Is multiplied by the number of conductors and the radius.

[0008]

In the power generator of the prior art, when one of the three windings constituting the three-phase winding is broken, an excessive current is applied to the remaining windings. Flow, leading to destruction and burning. In other words, when one of the windings becomes non-conductive, the control means drives the inverter circuit to alternately supply power between the terminals of the remaining two windings, so that the same rotation speed or torque as before disconnection is obtained. State. For this reason, the current flowing through the remaining two windings becomes excessive, leading to the destruction and burning.

[0009]

SUMMARY OF THE INVENTION In order to solve the problems of the conventional structure, the present invention provides a method for detecting the disconnection of one of the three-phase windings by a conduction detecting means. The power generation device acts to stop the inverter circuit upon detection.

[0010]

According to the first aspect of the present invention, the control means has conduction detecting means for detecting whether or not the three-phase winding is disconnected, and the conduction detecting means constitutes the three-phase winding. When the disconnection of one winding is detected, the inverter stopping means is a power generating device for stopping the inverter circuit.

According to a second aspect of the present invention, one of the three-phase windings is provided with a current switching means which operates at a predetermined temperature, and when the temperature of the winding rises due to an abnormality, one winding is provided. The power generation device is such that the line is open and the inverter circuit can be reliably stopped by the conduction detecting means and the inverter stopping means.

According to a third aspect of the present invention, there is provided a power generation device capable of reliably stopping an inverter circuit by a current switching means provided in any two of the three-phase windings even if an abnormality occurs in the control means. .

According to a fourth aspect of the present invention, the control means includes:
By comparing the maximum value and the average value of the input current of the inverter circuit, a safe power generation device capable of reliably detecting non-conduction of the winding with a simple configuration.

According to a fifth aspect of the present invention, the control means includes:
By measuring the current flowing through the switching element when the switching element included in the inverter circuit is turned on, a safe power generation device capable of detecting winding breakage at high speed is provided.

According to a sixth aspect of the present invention, the control means includes:
By comparing the number of revolutions of the motor with the ripple frequency of the input current of the inverter circuit, the power generation device has high noise resistance and reliably stops operation in an abnormal state.

According to a seventh aspect of the present invention, there is provided an electric washing machine having the power generating device according to any one of the first to sixth aspects, which is capable of overheating even in an abnormal state such as an excessive load of clothes or a power supply abnormality. It is an electric washing machine that can be prevented and has high safety.

[0017]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a circuit diagram showing the configuration of the power generation device of the present embodiment. The power generating apparatus according to the present embodiment includes a first object 12 having a three-phase winding 13, a second object driven by the first object 12, and an inverter for supplying a current to the three-phase winding 13. It comprises a circuit 17, control means 18 for controlling the inverter circuit 17, a DC power supply 20 for supplying DC power to the inverter circuit 17, and a commercial power supply 19.

The first object 12 includes an iron core formed by stacking silicon steel plates, a first winding 14, a second winding 15, and a third winding 15 wound by using slots provided in the iron core. Winding 16. First winding 14 and second winding 15
And the third winding 16 are electrically separated from each other by 120 ° so as to form the three-phase winding 13. The second object (not shown) has, for example, a configuration in which a ring-shaped permanent magnet is provided on the surface of a magnetic body. The inverter circuit 17 includes first and second switching elements and a third switching element.
-It is configured by connecting three series circuits in which two switching elements of a fourth switching element and a fifth and a sixth switching element are connected in series, in parallel. Note that an IGBT is used for each switching element. The output side of these switching elements is connected to the connection terminals U, V, W of the three-phase winding 13. That is, the terminals U, V, and W connecting the three-phase winding 13 are controlled to three states of positive voltage, zero voltage, and open by a combination of on and off of the two switching elements. The input side of each switching element is connected to the output of the DC power supply 20.

The DC power supply 20 converts the commercial power supply 19 into DC by a diode bridge 20, a choke coil 21, and a smoothing capacitor 22.

The control means 18 comprises, for example, a Hall IC and a microcomputer, and controls on / off of the switching element. Further, in this embodiment, the control means uses the function of the microcomputer to conduct the conduction detection means 23 and the inverter stop means 2 which operates according to the signal of the conduction detection means 23.
Five. Conduction detection means 23 detects the magnitude of the input current I _in the inverter circuit 17. That is, by utilizing the input current is in the maximum value and the output torque and the most proportional of the second object of I _in, also the rotational speed and the output torque of the second object is also almost proportional relationship, the second when the object is a predetermined rotation speed, when the maximum value of the input current I _in has exceeded a predetermined value, it is an forced zero bias the gate signals of the switching elements constituting the inverter circuit 17.

The operation of this embodiment will be described below. The control means 18 controls the inverter circuit 17 to set the connection terminal U of the first winding 14 constituting the three-phase winding to positive, the connection terminal V of the second winding 15 to 0, Winding connection terminal W
Is opened, a current flows through the first winding 14 and the second winding 15. Subsequently, between the connection terminals U and W, between the connection terminals V and W, between the connection terminals V and U, between the connection terminals W and U, between the connection terminals W and V, A voltage is sequentially applied between the terminal U and the connection terminal V. As a result, a current flows through each of the three-phase windings 13 constituting the first object 12, and the first object 12 generates a rotating magnetic field. Due to this rotating magnetic field, a force according to the Fleming left hand rule is generated in the second object, and the second object rotates.

At this time, that is, the input current I _in flowing to the inverter circuit 17 in the normal state changes as shown in FIG. Here, for example, it is assumed that the first winding 14 constituting the three-phase winding 13 is disconnected due to an abnormality such as a collision of a falling object. At this moment, the three-phase winding 13
, The rotational speed and the torque of the electric motor 11 decrease. At this time, the control means 18 controls the rotation speed by the microcomputer, and tries to maintain the rotation speed and the torque of the second object in the normal state. Therefore, the input current Iin flowing through the inverter circuit 17 is increased as shown _in FIG. That is, the current flowing through the second winding 15 and the third winding 16 is increased.
Conduction detection means 23 has detected the magnitude of the input current I _in, the maximum value is what sends the ON signal to the inverter stop means 25 exceeds a predetermined value.

In this embodiment, the predetermined value is set between the value at the time of normal operation and the value at the time of disconnection. Therefore, when one of the three-phase windings 13 is disconnected due to the abnormal phenomenon, the inverter stopping means 25 operates to turn off all the switching elements constituting the inverter circuit 17 and stop the inverter circuit 17. It is.

In this embodiment, once the inverter stop means 25 operates, the latched state is established.
To cancel this, it is necessary to disconnect the commercial power supply 19 once. However, the present invention is not limited to only the configuration for performing the latch operation, and a release method for releasing the latch state can be released without disconnecting the commercial power supply 19 by inputting a release signal to the device, for example. It is.

As described above, according to the present embodiment, even if only one of the three-phase windings 13 is disconnected,
This disconnection can be reliably detected, and the operation of the inverter circuit 17 can be stopped. For this reason, an overcurrent can be prevented from flowing through the inverter circuit 17, and thus a safe power generation device that can prevent the device from overheating can be realized. Further, the power generation device can be restored by repairing the broken portion.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 3 is a circuit diagram showing the configuration of the present embodiment. In this embodiment, a current switching means 30 for opening and closing a circuit at a predetermined temperature is connected to one winding 14 constituting the three-phase winding 12. In this embodiment, a bimetal whose shape changes when a predetermined temperature is reached is used as the current switching means 30. One end of the winding 14 is connected to one end of the current switching means 30, and the other end of the current switching means 30 is connected to a connection terminal U.

The operation of this embodiment will be described below. It is assumed that a foreign object enters between the first object 12 and the second object for some reason, and the second object is locked. At this time, the control unit 18 attempts to release the locked state by increasing the current supplied to the three-phase winding 13. Accordingly, the amount of heat generated by the three-phase winding 13 increases, and the temperature of the first object 12 increases. The current switching means 30 deforms and opens the circuit when the temperature exceeds a predetermined value. That is, the winding 14 is opened, and the winding 15 and the winding 16 are brought into conduction. As a result, the first
As described in the third embodiment, the conduction detecting means 23 operates, and the inverter stopping means 25 stops the operation of the inverter circuit 17.

That is, according to the present embodiment, when the second object is locked and the three-phase winding 13 rises in temperature, one of the three-phase windings is reliably opened and the inverter circuit 17 is opened. Is stopped, and a power generation device in which the temperature of the device does not rise above a predetermined value can be realized.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 4 is a circuit diagram showing the configuration of this embodiment. In this embodiment, the winding 1 constituting the three-phase winding 13
4. Current switching means 30 and current switching means 31 in the winding 15
Are connected.

The operation of this embodiment will be described below. In the event of an abnormality, one of the two current switching means 30 and 31 operates first. For example, it is assumed that the current switching means 30 operates first. At this point, the conduction detecting means 23
Disconnection of one winding 14 is detected, and inverter stopping means 25
Operates to stop the inverter circuit 17. However, at this time, if the control circuit 18 malfunctions or the inverter circuit 17 continues to operate, an overcurrent is supplied to the second winding 15 and the third winding 16. It is. In this embodiment, even in the case of such an abnormality, the circuit is reliably shut off by operating the current switching means 31,
The device stops.

That is, according to the present embodiment, in addition to the abnormality that the second object is in the locked state, even if the control means 18 has an abnormality, the operation can be stopped reliably without fail. It realizes a simple power generation device.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described. FIG. 5 is a circuit diagram showing the configuration of this embodiment. In this embodiment, the inverter circuit 17 is an IGBT
And a switching element composed of a parallel circuit of a reverse conducting diode. That is, a series circuit of the first switching element 40 and the second switching element 41, a series circuit of the third switching element 42 and the fourth switching element 43, and a fifth switching element 44 and the sixth switching element. Forty-five series circuits are connected in parallel. The control means 18 includes a current detection means 50 comprising a resistor connected between the inverter circuit 17 and the smoothing capacitor 22;
1, an average value detecting means 52, a comparing means 53, an inverter stopping means 25, and a drive circuit 66.
The drive circuit 66 includes a first switching element 40, a second switching element 41, and a third switching element 4.
The on / off of the second switching element 43, the fifth switching element 44, and the sixth switching element 45 is controlled. In this embodiment, the maximum value detecting means 51 uses a peak hold circuit constituted by an emitter follower circuit of a transistor and a capacitor. The average value detecting means 52 is constituted by a series circuit of a resistor and a capacitor whose constants are appropriately set.

The operation of this embodiment will be described below. FIGS. 6 (a) shows the waveform of the input current I _in to the inverter circuit 17 in a normal state. The input current I _in has a waveform close to a triangular wave due to the inductance of the three-phase winding 13. Therefore, the maximum value I _p of the input current I _in, between the average value I _ave of the input current I _in, is made up relationship that I _p = 2 * I _ave a normal state. When the load connected to the second object becomes heavy and the torque generated by the second object increases, the waveform of the input current I _in to the inverter 17 is limited by the resistance value of the three-phase winding 13 and becomes rectangular. Get closer to the waves. In this state, the relationship between I _p and I _ave is I _p = I _ave .

Of the three windings constituting the three-phase winding 13,
One winding breaks or locks on a second object
State and the current described in the second or third embodiment.
If the opening / closing means 30 or 31 becomes non-conductive,
Input current I to inverter 17 _inIs shown in FIG.
Become so. In other words, two windings that are conducting
Only the line is supplied with power from the inverter 17.
In this state, I_pAnd I_aveIs related to I_p=
6 * I_aveIt has become. In addition, two three-phase windings 13
In the state of the line, the torque generated by the second object is
The input current I to the inverter 17 increases_inWaveform
When it approaches the shape wave, I_p= 3 * I_aveIn the relationship
Is what it is.

That is, the comparison means 53 of this embodiment indicates that one of the three windings constituting the three-phase winding 13 is in a non-conductive state when I _p becomes three times or more of I _ave. Is transmitted to the inverter stopping means 25. In this case this embodiment, since the relationship between the I _p and I _{a ve} is simple, and the output voltage of the maximum value detecting means 51, the average value detecting unit 52 output voltages respectively appropriate for dividing it and the Thus, the comparison means 53 can be realized by a single comparator.

As described above, according to the present embodiment, the conduction detecting means can be realized with a simple configuration, and when one of the three windings constituting the three-phase winding 13 becomes non-conductive, A safe power generation device that reliably stops operation can be realized.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described. FIG. 7 is a circuit diagram showing the configuration of this embodiment. In the present embodiment, the control unit 18 includes a first current detection unit 60 connected in series to the second switching element 41.
And a second switching element connected in series to the fourth switching element 43.
Current detection means 61, third current detection means 62 connected in series to the sixth switching element 45, first logic circuit 63, second logic circuit 64, and third logic circuit 65
, An inverter stopping means 25, and a drive circuit 66. The first logic circuit 63 transmits an ON signal to the inverter stopping means 25 when the second switching element 41 is ON and the current flowing through the first current detecting means 60 is 0. The second logic circuit 64 transmits an ON signal to the inverter stopping means 25 when the current flowing to the second current detecting means 61 is 0 when the fourth switching element 43 is ON. When the sixth switching element 457 is on, the third logic circuit 65 outputs the third current detecting means 62
When the current flowing through the inverter is 0, an ON signal is transmitted to the inverter stopping means 25. The first current detection means 60, the second current detection means 61, and the third current detection means 62 are constituted by resistors, and the first logic circuit 6
The third, second and third logic circuits 64 and 65 are constituted by ICs.

The operation of this embodiment will be described below. FIG. 8A is a waveform showing on / off operations of the second switching element 41, the fourth switching element 43, and the sixth switching element 45. FIG. 8B is a waveform showing the input current I _in to the inverter circuit 17 in a normal state, and FIG. 8C is one of the three windings constituting the three-phase winding 13. (here, the first winding 14) is a waveform showing the input current I _in to the inverter circuit 17 when becomes nonconductive.

As is clear from FIG. 8, the ON period of each switching element is fixed.
Therefore, for example, when the second switching element 41 is turned on, an abnormality occurs when the first current detection means 60 does not detect a current for a predetermined period, and the first logic circuit 63 stops the inverter operation. An ON signal is transmitted to the means 25. Thus, the inverter stopping means 25 stops the inverter circuit 17.

As described above, according to this embodiment, the conduction detecting means which operates at a relatively high speed can be realized, and one of the three windings constituting the three-phase winding becomes non-conductive. At this point, it is possible to realize a safe power generation device that reliably stops operation.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described. FIG. 9 is a circuit diagram showing the configuration of this embodiment. In this embodiment, the control unit 18 includes a frequency detection unit 70, a rotation speed detection unit 71, a comparison unit 72, and a drive circuit 66. Frequency detection means 70, the input current I _in flowing through the inverter circuit 17 and a current sensing means comprising a resistor for detecting and converting into voltage, the waveform of the input current at which the current detection unit detects the pulse waveform of the high-low And a counter for counting the number of pulses for a predetermined period. Also, the rotation speed detecting means 71
Comprises a Hall IC for detecting the magnetic pole of the permanent magnet of the second object, and a counter for counting the number of pulses of the signal output by the Hall IC. The comparing means 72 compares the count number output by the rotation speed detecting means 71 with the counter number output by the frequency detecting means 70, and transmits an ON signal to the inverter stopping means 25 when a difference equal to or more than a predetermined value occurs. doing.

The operation of this embodiment will be described below. FIG. 10A shows a hole I constituting the rotation number detecting means 71.
C shows a pulse waveform. And FIG. 10 (b) shows the waveform of the input current I _in to the inverter circuit 17 at the time of normal operation. FIG. 10C shows a case where one of the three windings constituting the three-phase winding 13 becomes non-conductive.
Shows the waveform of the input current I _in to the inverter 17.

In this embodiment, the pulse generator constituting the frequency detecting means 70 is an IC which outputs high for a predetermined time when the input current to the inverter circuit 17 becomes zero.
Is used. As a result, in the normal state shown in FIG. 10B, the number of pulses detected by the frequency detecting means 70 is equal to the rotation number detecting means 7 shown in FIG.
1 is about twice the number of pulses of the detected signal. As shown in FIG. 10C, when one of the three windings constituting the three-phase winding 13 becomes non-conductive, the number of pulses detected by the frequency detecting means 70 is reduced. Is a rotation speed detecting means 71 shown in FIG.
Is 1.5 times the number of detected pulses.

By utilizing this phenomenon, in this embodiment, the comparing means 72 constituted by an IC is used as the rotational speed detecting means 71.
Is compared with the count number output by the frequency detecting means 70, and an ON signal is transmitted to the inverter stopping means 25 when a difference equal to or more than a predetermined value occurs. Therefore, when one of the three windings constituting the three-phase winding 13 becomes non-conductive, it can be reliably detected and the inverter circuit 17 can be stopped. At this time, in this embodiment, the conduction detecting means 23 is replaced by the frequency detecting means 7.
Since it is constituted by 0, the rotation speed detecting means 71 and the comparing means 72, and the conduction state is determined only by the high / low pulse, the noise resistance is high.

Each of the power generators described in the first to sixth embodiments is an example of a motor that supplies power to a load while performing a rotary motion. The present invention is not limited to such a motor, and can be applied to, for example, a motor that performs a linear motion and is generally called a linear motor.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described. FIG. 11 is a cross-sectional view showing the configuration of this embodiment. The washing machine outer frame 91 has a water receiving tub 93 suspended by four hanging rods 92 provided at four corners, and a washing and dewatering tub 94 is rotatably arranged in the water receiving tub 93. At the bottom of the washing and dewatering tub 94, a stirring blade 95 is rotatably disposed. At the bottom of the water receiving tank 93, a power generating device 96 constituted by an inverter and an electric motor is provided. The rotational force of the power generation device 96 is transmitted to the agitating blade 95 and the washing and dewatering tub 94 via a V-belt 97 and a speed reduction mechanism 98. 99 is a drain valve and 100 is a water supply valve. The control device 101 controls each step of washing, rinsing, and dehydration according to the conditions set by the user using input means (not shown), and controls the power generation device 96. The power generation device 96 used in this embodiment
Has the configuration described in each of the above embodiments.

The operation of this embodiment will be described below. When the power generation device 96 is driven in a state where an excessive amount of clothing is put into the washing and dewatering tub 94, the power generation device 96 is overloaded and the temperature rises. At this time, as described in the third embodiment, the current switching means in the power generation device 96 operates at a predetermined temperature to be in a non-conductive state, and then the conduction detecting means.
The inverter stopping means operates to stop the inverter circuit. For this reason, the power generation device is stopped before the overheating state is reached, and it is possible to prevent deterioration of the characteristics of the surrounding components, smoke, and ignition. Further, even when the control means constituting the power generation device 96 fails, the two current switching means are sequentially turned off when the temperature exceeds a predetermined temperature, so that the power generation device can be reliably stopped. Things.

As described above, according to the present embodiment, even if an abnormal condition such as an excessive load of clothes or a power supply error occurs, the power generation device is reliably stopped before the overheat condition is reached, and the heat of the components is prevented. It is intended to realize a highly safe electric washing machine capable of preventing deterioration and the like caused by the washing.

[0049]

According to the present invention, a first object having a three-phase winding and a second object driven by the first object are provided.
Object, an inverter circuit for supplying a current to the three-phase winding, and control means for controlling the inverter circuit, wherein the control means has conduction detection means for detecting the presence or absence of disconnection of the three-phase winding, When the conduction detecting means detects disconnection of any one of the three-phase windings, the inverter circuit is stopped to realize a safe power generation device capable of preventing overheating.

According to a second aspect of the present invention, when any one of the three-phase windings is provided with a current switching means operating at a predetermined temperature, the three-phase winding can be used when the temperature of the winding rises due to an abnormality. The present invention realizes a power generation device capable of surely stopping an inverter circuit by means of conduction detection means and inverter stop means with one winding open.

According to a third aspect of the present invention, there is provided a configuration in which a current switching means operating at a predetermined temperature is provided in any two windings constituting a three-phase winding. The present invention realizes a power generation device that can reliably stop even if an abnormality occurs in the control means.

According to a fourth aspect of the present invention, the control means includes:
As a configuration for comparing the maximum value and the average value of the input current of the inverter circuit, a safe power generation device capable of reliably detecting non-conduction of a winding with a simple configuration is realized.

According to a fifth aspect of the present invention, the control means includes:
As a configuration for measuring a current flowing through the switching element when the switching element included in the inverter circuit is turned on, the present invention realizes a safe power generation device capable of detecting a winding disconnection at high speed.

According to a sixth aspect of the present invention, the control means comprises:
As a configuration for comparing the number of revolutions of a motor with a ripple frequency of an input current of an inverter circuit, the present invention realizes a power generation device that has high noise resistance and reliably stops operation in an abnormal state.

According to a seventh aspect of the present invention, there is provided an electric washing machine having the power generating device according to any one of the first to sixth aspects, which is capable of overheating even in an abnormal state such as an excessive load of clothes or an abnormal power supply. This is to realize an electric washing machine which can be prevented and has high safety.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a power generation device according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram showing a waveform of a current flowing through a winding in a normal state and a waveform of a current flowing through the remaining winding when one winding is disconnected.

FIG. 3 is a circuit diagram showing a configuration of a power generation device according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a power generation device according to a third embodiment of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a power generation device according to a fourth embodiment of the present invention.

FIG. 6 is a waveform diagram showing a waveform of a current flowing through the windings in a normal state and a waveform of a current flowing through the remaining windings when one winding is disconnected.

FIG. 7 is a circuit diagram showing a configuration of a power generating device according to a fifth embodiment of the present invention.

FIG. 8 is a waveform diagram showing an operation of the switching element in a normal state, a waveform of a current flowing in the winding in a normal state, and a waveform of a current flowing in the winding when one winding is disconnected.

FIG. 9 is a circuit diagram showing a configuration of a power generation device according to a sixth embodiment of the present invention.

FIG. 10 shows a hole I detected by the rotation speed detecting means.
Waveform diagram showing the waveform of the input current of the inverter circuit when the pulse waveform of C is operating normally and the waveform of the input current of the inverter circuit when one winding is disconnected.

FIG. 11 is a sectional view showing the configuration of a washing machine according to a seventh embodiment of the present invention.

FIG. 12 is a circuit diagram showing a configuration of a conventional power generation device.

[Explanation of symbols]

 12 first object 13 three-phase winding 17 inverter circuit 18 control means 23 conduction detection means 25 inverter stop means 30 current switching means 31 current switching means 50 current detection means 51 maximum value detection means 52 average value detection means 53 comparison means 60 First current detection means 61 Second current detection means 62 Third current detection means 63 First logic circuit 64 Second logic circuit 65 Third logic circuit 70 Frequency detection means 71 Revolution detection means 72 Comparison means 96 power generator

Claims (7)

[Claims] 1. A first object having a three-phase winding, a second object driven by the first object, an inverter circuit for supplying a current to the three-phase winding, and control means for controlling the inverter circuit. Wherein the control means has conduction detection means for detecting the presence / absence of disconnection of the three-phase winding. When the conduction detection means detects disconnection of any one of the three-phase windings, Is a power generator that stops the inverter circuit. 2. One of the three-phase windings,
2. The power generating device according to claim 1, further comprising a current switching unit that operates at a predetermined temperature. 3. Any two windings constituting a three-phase winding,
2. The power generating device according to claim 1, further comprising a current switching unit that operates at a predetermined temperature. 4. The power generating apparatus according to claim 1, wherein the control unit compares the maximum value and the average value of the input current of the inverter circuit. 5. The control device according to claim 1, wherein the control unit measures a current flowing through the switching element when the switching element included in the inverter circuit is on.
The power generator described in the section. 6. The control unit according to claim 1, wherein the control unit compares the rotation speed of the motor with a ripple frequency of an input current of the inverter circuit.
4. The power generator according to any one of claims 1 to 3. 7. An electric washing machine having the power generation device according to claim 1.