JP4752779B2 - Motor drive device for washing and drying machine - Google Patents

Description

  The present invention relates to a motor drive device such as a heat pump type washing and drying machine that simultaneously drives a plurality of motors by a plurality of inverter circuits.

Conventionally, this type of motor driving apparatus has driven a plurality of motors simultaneously by a control means using a plurality of inverter circuits (see, for example, Patent Document 1).
JP 2006-116066 A

  However, since such a conventional motor driving device shares the DC power source of the first inverter circuit that drives the washing and dehydrating motor and the second inverter circuit that drives the compressor motor of the heat pump, In the dehydration drying operation in which the motor and the compressor motor rotate simultaneously at the same time, the DC voltage is lowered, so that the dehydration rotation speed and the dehydration rate are reduced, and the drying time is increased. Furthermore, when the AC power supply voltage is lowered, there is a problem that the AC current is remarkably increased to increase the harmonics of the AC power supply, and the heat generation of power components such as the reactor and the power supply diode is increased due to the increase of the AC current.

  The present invention solves the above-described conventional problems, and includes a first inverter circuit that drives a washing / dehydrating motor between positive and negative DC power supply buses of an inverter circuit, and a second inverter circuit that drives a compressor motor of a heat pump. Connected in parallel, connected the reactor between the rectifier circuit and the AC power supply constituting the DC power supply, connected the short-circuit means between the AC input terminals of the rectifier circuit and short-circuited from the AC power supply voltage zero voltage for a predetermined time to the reactor A current is passed to control the DC power supply bus voltage.

  In order to solve the above-described conventional problems, the motor driving device of the heat pump type washing and drying machine according to the present invention includes a power factor correction circuit (Power Factor Correction circuit) including a reactor and a short-circuit means between rectifier circuits constituting an AC power source and a DC power source. Circuit (PFC circuit) is connected, and a first inverter circuit that drives the washing and dehydrating motor is connected between the DC power supply buses and a second inverter circuit that drives the compressor motor of the heat pump is connected in parallel, and the rectifier circuit Connect the short-circuit means in parallel with the AC input terminals and control the DC power supply bus voltage by controlling the short-circuit means conduction time from the AC power supply voltage zero voltage. Accordingly, the motor speed or the DC power supply bus voltage is controlled.

  The motor drive device of the heat pump type washing and drying machine of the present invention improves the power factor of the AC power source by a power factor correction circuit comprising a reactor and a short circuit provided between the AC power source and the rectifier circuit, and at the same time, sets the DC voltage to a predetermined value. It controls, and can not only improve power factor but also reduce power harmonics. Furthermore, since the direct current voltage can be controlled to a predetermined value even when the washing and dehydrating motor and the compressor motor are operated simultaneously, the high-speed motor can be rotated even at the time of high output in which a plurality of inverter circuits are operated simultaneously such as dehydrating and drying operation.

  A first invention is connected between a reactor connected in series with an AC power source, a rectifier circuit composed of a diode and a capacitor for converting AC power into DC power via the reactor, and an input terminal of the rectifier circuit. Short-circuit means for short-circuiting the AC power supply via the reactor, first and second inverter circuits for converting the output DC power of the rectifier circuit into AC power, the first and second inverter circuits, and the short-circuit Control means for controlling the means, wherein the first inverter circuit drives a washing / dehydrating motor for driving a washing / dehydrating tub, and the second inverter circuit drives a compressor motor of a heat pump heat exchanger The control means includes a DC voltage detection means for detecting an output DC voltage of the rectifier circuit, and the control means according to an output signal of the DC voltage detection means. Voltage control means configured to control a conduction pulse width from a zero voltage phase of the AC power supply of the AC power supply means, and inverter control means for controlling the first and second inverter circuits, the washing and dehydrating motor, The motor rotation speed or the output DC voltage of the rectifier circuit is controlled in accordance with the operating state of the compressor motor, and not only the AC power supply current can be reduced by the power factor improvement, but also the DC Since a decrease in power supply voltage can be prevented, a high speed dewatering operation of the washing dewatering motor or a high output operation of the compressor motor can be performed.

  In a second aspect of the invention, the motor driving device for the washing and drying machine according to the first aspect of the invention is configured to provide an upper limit value for the conduction pulse width control signal of the voltage control means for controlling the output DC voltage of the rectifier circuit. When the AC power supply voltage decreases, the DC voltage also decreases due to the upper limit value of the conduction pulse width control signal, and the motor output also decreases, so that an increase in AC power supply current can be prevented.

  According to a third aspect of the present invention, in the motor drive device for the washing and drying machine according to the first aspect of the invention, the control means outputs the output signal of the DC voltage detection means or the rectification during the dehydration and drying operation in which the washing and dehydrating motor and the compressor motor are driven simultaneously The compressor motor speed is controlled according to the control signal of the voltage control means for controlling the output DC voltage of the circuit, and the output DC voltage drop or the AC power supply voltage drop is indirectly detected. As a result, the compressor motor output can be reduced to prevent the output DC voltage from being lowered, so that the high speed dewatering operation of the laundry dewatering motor can be performed.

  According to a fourth aspect of the present invention, the motor driving device for the washing / drying machine according to the first aspect of the present invention includes current detection means for detecting an AC power supply current, and the output DC voltage of the rectifier circuit according to the current signal of the current detection means, or The compressor motor speed is controlled, and when the AC power supply current increases, the compressor motor output can be reduced to prevent the AC power supply current from increasing, and the output DC voltage can be reduced. Since this can be prevented, a high speed dewatering operation of the laundry dewatering motor becomes possible.

  According to a fifth aspect of the present invention, the motor driving device for the washing / drying machine according to the first aspect of the present invention includes current detection means for detecting an AC power supply current, and controls the rotation speed of the compressor motor in accordance with a current signal of the current detection means. Thus, when the AC power supply current increases, the compressor motor output can be reduced and the increase of the AC power supply current can be prevented.

(Embodiment 1)
FIG. 1 is a block diagram of a motor driving device of a washing / drying machine according to the first embodiment of the present invention, and shows an example of a heat pump type washing / drying machine.

  In FIG. 1, a reactor 2 is connected in series with one terminal L <b> 1 of an AC power supply 1, and AC power is supplied to the rectifier circuit 3 via the reactor 2, and the rectifier circuit 3 includes a full-wave rectifier circuit 30 and an electrolytic capacitor 31. , 32 constitutes a voltage doubler rectifier circuit and constitutes a DC power source for converting AC power into DC power. The short-circuit means 4 is connected between the other terminal L2 of the AC power source 1 and the terminal L3 on the rectifier circuit 3 side of the reactor 2, that is, between the input terminals of the rectifier circuit 3. The AC power source 1 is short-circuited through the reactor 2 for a predetermined time to improve the power factor. DC power is supplied from the positive and negative DC power supply buses P and N of the rectifier circuit 3, and the first inverter circuit 5A, the second inverter circuit 5B, and the third inverter circuit 5C are connected in parallel and controlled. Means 6 converts DC power into AC power.

  The first inverter circuit 5A drives a washing / dehydrating motor 8 that drives the washing / dehydrating tub 7, the second inverter circuit 5B drives the compressor motor 10 of the heat pump heat exchanger 9, and the third inverter circuit 5C. Drives a fan motor 12 that drives a blower fan 11 for drying. For the motor current detection, the first current detection means 50A, the second current detection means 50B, and the third current detection means 50C are connected to the emitter terminal of the lower arm switching transistor of each inverter circuit, and washing and dewatering The motor 8 is vector controlled with a sensor, and the compressor motor 10 and the fan motor 12 are sensorless vector controlled or sensorless sine wave driven.

  The heat pump heat exchanger 9 compresses the refrigerant by a compressor (not shown) integrated with the compressor motor 10 and sends the refrigerant to the condenser 9A, and from the drying fan 11 through the condenser 9A. Warm air is blown into the washing and dewatering tank 7 to dry the clothes. The high-temperature and high-humidity exhaust air from the washing / dehydrating tub 7 is dehumidified and heat-exchanged by the evaporator 9 </ b> B and returned to the intake side of the drying blower fan 11.

  The control means 6 includes a DC voltage detection means 60 for detecting the positive and negative DC power supply bus voltage Vdc of the rectifier circuit 3, and a zero voltage of the AC power supply 1 to detect the power of the short-circuit means 4 for a predetermined time from the zero cross phase. The voltage control means 61 for controlling the DC power supply bus voltage Vdc to the DC bus voltage set value Vds by making the switching semiconductor conductive, and the first inverter circuit 5A, the second inverter circuit 5B, and the third inverter circuit 5C are respectively controlled. And inverter control means 62.

  FIG. 2 shows a detailed block diagram of the short-circuit means 4 and the voltage control means 61 of the power factor correction circuit.

  The output signal vdc of the DC voltage detection means 60 is added to the comparison means 610 of the voltage control means 61, and the comparison means 610 compares the set signal vds of the voltage setting means 611 with the error signal Δv to the conduction time control means 612. The conduction time control means 612 generates a predetermined conduction pulse width control signal according to the signal vzc from the zero cross detection means 613 that detects the zero voltage of the AC power supply 1, and the conduction pulse width according to the increase / decrease of the error signal Δv. The signal is controlled to control the conduction time ton of the short-circuit means so that the DC power supply bus voltage Vdc becomes the DC bus voltage set value Vds.

  The output signal of the conduction time control means 612 is applied to the switching means driving circuit 615 via the conduction time limiting means 614. The conduction time limiting means 614 limits the maximum value of the maximum conduction time ton according to the power supply frequency of the AC power supply 1 and sets the time to about 25 to 30% of the half cycle of the AC power supply 1. When the conduction time ton increases, the DC bus voltage Vdc increases. However, the DC bus voltage Vdc is increased by the conduction time limiting means 614 when the load current increases or when the AC power supply 1 decreases, the DC bus voltage setting value Vds. It becomes as follows.

  The switching means drive circuit 615 controls the conduction of the power switching semiconductor 41 connected between the DC output terminals of the full-wave diode bridge 40 constituting the short-circuit means 4, and the signal potential of the voltage control means 61 and the power switching semiconductor Since the drive signal level of 41 is different, it is composed of an electrically insulating means such as a photocoupler, a drive power supply means for the power switching semiconductor 41, and an on / off drive means, but the details are omitted.

  As described above, the short-circuit means 4 is composed of a full-wave diode bridge 40 and a power switching semiconductor 41 such as an insulated gate bipolar transistor (abbreviated as IGBT) between its DC output terminals, and is bi-directionally controlled on and off.

  FIG. 3 is a time chart showing the conduction control method of the short-circuit means 4, that is, the power switching semiconductor 41, and shows the AC power supply voltage Vac, the zero cross detection signal vzc, the gate driving signal Vg of the power switching semiconductor 41, and the reactor current IL. ing. The AC voltage phase and the current phase are substantially the same by controlling the conduction of the power switching semiconductor 41 for a predetermined time (ton) after a predetermined time delay (time t1, t4) from the zero phase (time to, t3) of the AC power supply voltage Vac. It becomes phase and can improve power factor.

  Further, since the coil energy accumulated in the reactor when the short-circuit means 4 is short-circuited is released to the DC power source when the short-circuit means 4 is turned off, there is an effect that the DC bus voltage Vdc is boosted. In addition, the harmonic current is reduced and the switching loss of the power switching semiconductor 41 is small. Therefore, in the dehydration drying process in which the washing dehydration motor 8 is rotated at high speed and the compressor motor 10 is simultaneously driven and the warm air is blown to the clothes by the fan motor 12, the power factor is improved by controlling the short-circuit means 4 on and off. However, since the DC bus voltage Vdc can be increased, the dehydration speed can be increased, the dehydration rate can be increased, and the drying time can be shortened. Further, since the DC bus voltage Vdc can be further increased in the drying process in which the compressor motor 10 and the fan motor 12 are simultaneously operated, the drying time can be increased by further increasing the number of revolutions of the compressor motor 10 and increasing the hot air temperature. Can be shortened.

  The inverter control means 62 drives the first inverter circuit 5A based on the position signal from the rotor position detecting means 8a of the washing / dehydrating motor 8 and the motor current signal detected by the current detecting means 50A, thereby vector-controlling the washing / dehydrating motor 8. The motor current of the compressor motor 10 for the heat pump and the fan motor 12 is detected by the current detection means 50B and 50C, and the inverter circuits 5B and 5C are controlled to drive the sensorless sine wave, thereby reducing noise and increasing the efficiency. I do. The second inverter circuit 5B performs sensorless vector control of the compressor motor 10 as described above. The motor current of the compressor motor 10 is detected by the second current detection means 50B, and the sensorless sine wave drive is performed to control the inverter. The rotor position is estimated by comparing the detected current with the current obtained by calculation from the motor parameter stored in the means 62 and the applied voltage to the motor, and the virtual dq axes in the control program are corrected to perform rotor phase control. To do. Since the torque of the compressor motor 10 varies depending on the mechanical rotor position due to structural factors of the compression mechanism, it is necessary to calculate the position as accurately as possible. In particular, so-called advance control that advances the current phase with respect to the q axis. In (field weakening control), the accuracy of position estimation calculation becomes a problem, so ensuring current detection accuracy, ensuring motor parameter accuracy, and a position estimation algorithm are problems.

  The third inverter circuit 5C drives the fan motor 12 by a position sensorless sine wave by constant reactive current control. The sine wave current is supplied to the fan motor 12 so that the reactive current with respect to the motor applied voltage is integrated and stabilized. Control. Since the rotation speed of the permanent magnet synchronous motor is constant regardless of the power supply voltage fluctuation and load fluctuation when the driving frequency f is constant, the constant driving frequency can be controlled by the constant reactive current control. Thus, the rotational speed fluctuation can be made almost zero. When the fan motor 12 is set to open loop drive frequency constant control (V / f control method) such as constant reactive current control, the rotational speed of the fan motor 12 can be constant regardless of fluctuations in the DC power supply voltage. The noise does not change, and the annoying fan noise fluctuation due to the rotational speed fluctuation can be eliminated.

  The current detection means 5A, 5B, and 5C are three shunt type current detection systems, and are composed of three or two shunt resistors and current signal amplification means. The basic configurations of the current detection means 50A, 50B, and 50C are exactly the same. By making the carrier frequency of all inverter circuits an integral multiple to synchronize the carrier signal, switching noise mutual interference at the time of current detection can be prevented.

  In the hot air dewatering operation, the washing and dewatering motor 8 (about 400 W), the compressor motor 10 (about 700 W), and the fan motor 12 (about 100 W) are driven simultaneously, so the total input of the washing and drying machine is 1200 W or more, Without the rate correction circuit, when the power supply voltage is AC 100 V, the AC input current is 13 to 15 A, and heat generation at the outlet becomes a problem. Furthermore, since the DC bus voltage Vdc is reduced, the spin speed cannot be increased, so that the spin rate is reduced and the drying time is increased. However, according to the present invention, the conduction time from the zero voltage phase of the short-circuit means 4 connected in series with the reactor 2 is controlled so that the DC bus voltage Vdc becomes the set value Vds. It is possible to prevent a decrease in bus voltage.

  FIG. 4 shows a basic washing / drying process flowchart of the washing / drying machine, and Table 1 shows the rotation speeds of the washing / dehydrating motor 8 and the compressor motor 10 in each process, and the DC bus voltage Vdc in each process. .

  Hereinafter, description will be made in order with reference to FIG. 4 and Table 1. The heat pump type washing / drying machine according to the present invention starts operation from Step 100, and includes a washing process in Step 101, an intermediate dehydration process in Step 102, a rinsing process in Step 103, a dehydration drying process in Step 104, and a drying process in Step 105 in this order. And the operation ends at step 106. The compressor motor 10 and the fan motor 12 for heat pump drying are started from the dehydration drying process in step 104.

  In the washing process of step 101, the rotational speed of the washing and dehydrating motor 8 is low, and the compression motor 10 and the fan motor 12 do not operate. Therefore, there is no problem even if the DC bus voltage Vdc is low, and the short circuit means 4, that is, the PFC circuit is operated. There is no need. However, the DC bus voltage Vdc is controlled to a constant value of 260 V in order to improve the detection accuracy of the cloth amount determination at the beginning of the washing process.

  In the next intermediate dehydration process of step 102, the DC bus voltage Vdc is controlled to be 280V in order to rotate the washing / dehydrating motor 8 at a high speed. The rinsing process in step 103 is basically the same as the washing process, and in the next dehydrating and drying process in step 104, the washing / dehydrating motor 8, the compressor motor 10 and the fan motor 12 all rotate at a high speed. Set the value Vds to 280V. The higher the DC bus voltage Vdc is set, the higher the dehydration speed can be. However, since the AC power supply current increases due to the voltage drop of the AC power supply 1 or the simultaneous operation with the compressor motor 10, the compressor motor speed is increased. Is set to 5000 r / min, which is lower than the drying process, and an upper limit value is set for the conduction time of the power switching semiconductor 41 of the short-circuit means 4 to prevent an increase in the AC power supply current due to the AC power supply voltage drop. Next, the routine proceeds to step 105, where the rotational speed of the washing and dehydrating motor 8 is reduced to about 50 r / min, the compressor motor rotational speed is increased to 6500 r / min, the compressor motor output is increased, and the drying time is shortened. Next, it transfers to step 106 and a drying operation is complete | finished.

  FIG. 5 shows a flowchart of the dehydration / drying process. The dehydration / drying process starts from step 200, and initial settings such as the rotational speed of each motor are performed in step 201. Each motor speed and DC bus voltage set value Vds are initially set to the values shown in FIG.

  Next, the process proceeds to step 202, and after the soft start to gradually increase the IGBT conduction time of the short-circuit means 4 from zero, the process proceeds to step 203 where the DC bus voltage Vdc is detected, and the process proceeds to step 204 where the DC bus voltage Vdc is The process shifts to feedback control for controlling the IGBT conduction time so that the DC bus voltage setting value Vds is obtained. Next, the process proceeds to step 205 to drive the washing / dehydrating motor 8 to perform dewatering rotation control. After a predetermined time has elapsed, the process proceeds to step 206 to drive the compressor motor 10 and the fan motor 12 to perform the rotation speed control.

  Next, the routine proceeds to step 207, where it is determined whether or not the DC bus voltage Vdc is lower than the DC bus voltage lower limit set value. If Vdc is lower than the set value, the output abnormality of the compressor motor 10 or the AC power supply voltage It is determined that there is an abnormal decrease, and the process proceeds to step 208 where the compressor motor set rotational speed is decreased from 5000 r / min to 3000 r / min. When the compressor motor speed is decreased, the DC bus voltage Vdc increases, and step 208 is not executed from the next time. Therefore, to restore the compressor motor speed, the period is limited to a predetermined period, for example, 10 to 30 minutes. It is good to return the set rotational speed to the original 5000 r / min.

  Next, the process proceeds to step 209 to determine the end of the dehydration drying process. If completed, the process proceeds to step 210 to end the process. If not completed, the process returns to step 203. The detection of the output abnormality or the AC power supply voltage drop in step 207 can be performed by the conduction time limiting means 614 shown in FIG. 2, and the same effect can be obtained by detecting the control signal of the conduction time limiting means 614. . That is, even if it is detected in step 207 that the control signal for the conduction time ton has reached a predetermined time or more and the compressor motor rotational speed in step 208 is lowered and changed, the same effect is obtained.

(Embodiment 2)
FIG. 6 is a block diagram of a motor driving device for a washing / drying machine according to the second embodiment of the present invention. The current detection means 13 is connected in series with the AC power source 1, and the current detection means 13 performs AC The input current or the current of the reactor 2 is detected, and the output signal of the current detector 13 is added to the voltage controller 61A of the controller 6A or the inverter controller 62A to control the DC bus voltage or the motor speed. To do. Since other basic configurations are not changed, description thereof is omitted.

  FIG. 7 shows a flowchart of the dehydration drying process in the second embodiment of the present invention. The dehydration and drying process starts from Step 300, and Steps 301 to 306 are the same as those in the flowchart of FIG. In step 307, the AC input current Iin is detected by the current detection means 13, and then the process proceeds to step 308 to determine whether the AC input current Iin is larger than the current set value. Reduce motor speed. In the case of a power supply voltage drop or an abnormal output, the compressor motor rotation speed is controlled to perform a current limiting operation so that the AC input current does not exceed the set value. The motor rotation speed may be proportionally controlled by a current error signal, or may be open loop control for decreasing the compressor motor rotation speed for a predetermined time as described in FIG. When the AC input current value is proportionally controlled to the upper limit value, the maximum output control is performed, and the drying output can be maximized to shorten the drying time.

  Step 309 shows a control example in which the compressor motor rotational speed is decreased. However, the AC input current can be limited to the upper limit value even if the set voltage of the voltage control means is decreased and the DC bus voltage Vdc is decreased. By reducing the DC bus voltage Vdc, the rotational speeds of the compressor motor 10 and the washing and dehydrating motor 8 are reduced and the output is also reduced, thereby preventing an increase in AC input current. However, when the DC bus voltage Vdc is lowered, not only the compressor motor 10 but also the dewatering rotation speed of the washing dewatering motor 8 is lowered, so that the dewatering rate is lowered and the drying time is increased.

  As described above, the present invention provides a power factor correction circuit comprising a reactor and a short-circuit means between the AC power source and the rectifier circuit of the heat pump type washing dryer, and the washing dehydration motor and the compressor motor rotational speed are determined according to the operation process. The DC bus voltage Vdc is controlled. The power factor correction circuit not only makes it possible to improve power factor and reduce harmonic currents, but also to make the DC bus voltage constant and boost, as well as increase the DC bus voltage for high-speed dehydration rotation in dehydration drying operation. Then, the drying time can be shortened without increasing the alternating current by reducing the compressor rotational speed.

  In addition, the cloth amount detection and unbalance detection accuracy can be increased by controlling the DC bus voltage at a constant voltage in the washing process and the dehydrating process. Further, by providing an upper limit value for the conduction time of the short-circuit means, abnormal heat generation of the electric and electronic parts due to an abnormal output or an increase in AC power supply current when the AC power supply voltage drops can be prevented.

  Furthermore, current detection means for detecting the AC power supply current is provided, and when the AC power supply current reaches the set upper limit value, the compressor rotational speed is reduced to prevent heat generation of electric and electronic parts such as a reactor due to the increase of the power supply current. The drying time can be shortened by setting the compressor output to the maximum possible value by the maximum output control.

  As described above, the motor driving device of the washing and drying machine according to the present invention relates to a multiple motor simultaneous driving inverter device provided with a power factor correction circuit, and is connected in parallel between the DC voltage control by the power factor correction circuit and the DC bus. The present invention relates to an inverter circuit connected to the relationship and its motor rotation speed control, and can also be applied to applications such as a commercial air conditioner driven by a plurality of inverter circuits and a plurality of compressors of a heat pump water heater.

Block diagram of motor drive device of washing and drying machine in Embodiment 1 of the present invention Detailed block diagram of the power factor correction circuit of the motor driving device of the washing and drying machine Time chart showing conduction control method of short-circuit means of motor driving device of same washing and drying machine Basic washing / drying process flowchart of the motor driving device of the washing / drying machine Flow chart of dehydration drying process of motor driving device of the washing and drying machine Block diagram of a motor driving device of a washing and drying machine in Embodiment 2 of the present invention Flow chart of dehydration drying process of motor driving device of the washing and drying machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC power supply 2 Reactor 3 Rectifier circuit 4 Short circuit means 5A 1st inverter circuit 5B 2nd inverter circuit 6 Control means 7 Washing dewatering tank 8 Washing dewatering motor 9 Heat pump heat exchanger 10 Compressor motor 60 DC voltage detection means 61 Voltage control means 62 Inverter control means

Claims (5)

A reactor connected in series with an AC power source, a rectifier circuit composed of a diode and a capacitor for converting AC power to DC power via the reactor, and connected between the input terminals of the rectifier circuit via the reactor Short-circuit means for short-circuiting the AC power supply, first and second inverter circuits for converting the output DC power of the rectifier circuit into AC power, and control means for controlling the first and second inverter circuits and the short-circuit means And the first inverter circuit drives a laundry dewatering motor, and the second inverter circuit drives a compressor motor of a heat pump heat exchanger, the control The means is a DC voltage detecting means for detecting the output DC voltage of the rectifier circuit, and the short-circuit means according to the output signal of the DC voltage detecting means. A voltage control unit configured to control a conduction pulse width from a zero voltage phase of a flowing power source; and an inverter control unit configured to control the first and second inverter circuits, the washing and dehydrating motor, and the compressor A motor driving device for a washing and drying machine, which controls the number of rotations of each motor or the output DC voltage of the rectifier circuit in accordance with the operating state of the motor. 2. The motor driving device for a washing and drying machine according to claim 1, wherein an upper limit value is provided for the conduction pulse width control signal of the voltage control means for controlling the output DC voltage of the rectifier circuit. The control means is configured to respond to the output signal of the DC voltage detection means or the control signal of the voltage control means for controlling the output DC voltage of the rectifier circuit during the dehydration drying operation in which the washing dehydration motor and the compressor motor are simultaneously driven. 2. A motor driving device for a washing and drying machine according to claim 1, wherein the number of rotations of the motor is controlled. 2. A washing and drying apparatus according to claim 1, further comprising current detection means for detecting an AC power supply current, wherein the output DC voltage of the rectifier circuit or the rotation speed of the compressor motor is controlled in accordance with a current signal of the current detection means. Motor drive device of the machine. 2. The motor driving device for a washing and drying machine according to claim 1, further comprising a current detecting means for detecting an AC power supply current, wherein the number of revolutions of the compressor motor is controlled in accordance with a current signal of the current detecting means.

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