JP6528082B2 - Washing machine - Google Patents

Description

  The present invention relates to a washing machine that controls the rotation of a motor.

  Conventionally, in the case of a method in which the motor is controlled by inverter control, the washing machine supplies the inverter unit with a voltage obtained by converting an AC voltage from a commercial electric power into a DC voltage in the converter unit. The inverter unit has switching means for converting a DC voltage into a three-phase AC voltage, and controls the rotation of the motor. When the motor is decelerated and controlled, the regenerative current from the motor is regenerated to the smoothing capacitor of the converter unit, so that the DC voltage rises, but the DC voltage is usually designed not to exceed the threshold.

  When the DC voltage exceeds the threshold for some reason, the protection works and the main power supply relay is turned off and the power is turned off. Also, a discharge circuit composed of a power type resistor and a switching element is provided in the DC power supply circuit, and when the DC voltage exceeds the threshold for a moment, the gate signal of the power element for driving the motor is turned off. Thus, the discharge resistance is connected according to the configuration described above, and the regenerative current is consumed (for example, Patent Document 1 and Patent Document 2).

JP-A-4-58774 JP, 2008-18131, A

  However, in the configurations according to the conventional Patent Document 1 and Patent Document 2, large-sized power type resistors and switch circuits are required at both ends of the DC circuit. The DC voltage rises up to near DC280V to DC500V, and in a large resistor, a current of 3A or more may flow for a long time, and it is necessary to have a configuration to consider safety as a firing source.

  When the conventional configuration is adopted for a washing machine, there is no space for considering sufficient safety measures inside the washing machine, and a high cost part is combined, which causes a cost increase and other problems in the home. Adoption of a washing machine for a car is not realistic.

  In addition, as a problem in the case of a washing machine of a general configuration, when the user puts the laundry into the washing machine and starts the laundry and the cloth amount detecting operation is completed, the amount of detergent required for the operation display As it is displayed, it is assumed that the appropriate amount of detergent shown can be included.

  However, there are cases where some users think that if the amount of detergent indicated is increased, the detergency is higher, and more than twice as much is added.

  In particular, there are products that are extremely high in effervescence even in small amounts, such as concentrated detergents, and when such detergents are more than doubled, cases may occur where the lathering detergent can not be drained well in the rinsing step after washing . If the detergent is not drained enough and if a large amount of foam is accumulated between the drum and the receiver cylinder and the intermediate dewatering operation mode of the rinsing step is entered, the rotation of the drum rises up and between the drum and the receiver cylinder The detergent left behind is further foamed and a large load is generated on the motor for driving the drum. In this state, the drum is controlled to a target rotational speed at a prescribed acceleration, so the voltage applied to the motor and the current supplied to the winding also increase.

  Then, when the foam is drained suddenly at the timing when foam is stagnant between the drum and the receiving cylinder and the load is reduced lightly, the proportional gain of speed feedback control is small, so the number of rotations of the drum is large. Overshoot the target speed. The control device performs speed control so as to lower the voltage applied to the motor in order to reduce the target rotational speed by speed feedback control. Since the control device decelerates rapidly from an assumed high rotational speed and tries to return to the target rotational speed, a high regenerative current is returned from the motor to the electrolytic capacitor of the converter section, and the DC voltage rapidly rises. When the DC voltage rises above the specified value, the protection device operates and the power supply relay is turned off immediately to turn off the power, so that the motor stops free running.

  In this case, the user thinks that the washing is completed because the washing machine has been powered off and the operation display unit has not notified of an abnormality, and the user turns on the washing machine and opens the door to open the laundry. If it is attempted to take it out, it may be assumed that the washing machine has failed and the manufacturer's repair is requested because the laundry is not dehydrated. If the user does not dehydrate the laundry, when the dewatering operation is attempted, the detergent remaining between the drum and the receiver foams, the same phenomenon as described above occurs again, the power is turned off, and the dewatering occurs. It is assumed that it is impossible.

  In order to solve the conventional problems, the washing machine of the present invention is a washing machine in which the power of the washing machine is not turned off even when the voltage detected by the DC voltage detection unit exceeds a threshold while the motor is driven. The purpose is to provide a machine.

In order to solve the above-mentioned conventional problems, a washing machine according to the present invention includes a rotary drum which accommodates a laundry and is rotationally driven, and a converter unit which converts an AC voltage from a commercial power source into a DC voltage by a rectifier circuit and a capacitor. An inverter unit for converting a DC voltage of the converter unit into a three-phase AC voltage for controlling rotation of a motor for driving the rotating drum; a sensor signal detection unit for detecting a position of a rotor of the motor; The controller is provided with a controller for controlling the speed of the motor based on the signal detected by the sensor signal detector, and a DC voltage detector for detecting a DC voltage of the converter is provided, and the controller drives the motor. If the DC voltage detected by the DC voltage detector exceeds the threshold during a certain period, the motor is temporarily stopped, and restarted after a prescribed period to operate the operation mode. Continued, and the restart counter unit for counting the number of restarts provided, if the restart counter unit has counted multiple reboots, after performing the draining step is carried out water supply step, by restarting The operation mode is continued .

  The washing machine of the present invention can provide a washing machine in which the power supply of the washing machine is not turned off even when the voltage detected by the DC voltage detection unit exceeds the threshold while the motor is being driven.

Principal Cross-Sectional View of Washing Machine According to Embodiment 1 of the Present Invention Block diagram of the control circuit Voltage waveform diagram applied to the same motor Operation flow chart of same motor drive control Control operation flow chart of same state Control operation flow chart of different state Control operation flow chart of different state Control operation flow chart of different state

According to a first aspect of the present invention, there is provided a rotary drum which accommodates a laundry and is rotationally driven, a converter portion for converting an AC voltage from a commercial power source into a DC voltage by a rectifier circuit and a capacitor, and a DC voltage of the converter portion An inverter unit that converts a three-phase AC voltage for controlling rotation of a motor that drives a rotary drum, a sensor signal detection unit that detects the position of the rotor of the motor, and a signal detected by the sensor signal detection unit And a control unit for controlling the speed of the motor, and a direct current voltage detection unit for detecting a direct current voltage of the converter unit, wherein the control unit detects the direct current voltage detection unit during a period of driving the motor. re DC voltage temporarily stops the motor when exceeding the threshold value, and then restart after a prescribed period to continue the operation mode, it counts the number of restarts Dynamic counter part provided, when the restart counter unit has counted multiple reboots, after performing the draining step is carried out feedwater step, in which a structure to continue the operation mode by restarting .

  As a result, even if the DC voltage detected by the DC voltage detection unit exceeds the threshold while the motor is being driven, the power of the washing machine can be prevented from being turned off by temporarily stopping the motor. In addition, since the motor is temporarily stopped, the foam is defoamed and drained, and the operation can be continued by restarting after the specified time has elapsed. Even if there is a rare case in which bad conditions may occur by accident, the operation mode can be finally completed to the end, thereby preventing the user from erroneously determining that it is a failure and requesting service for mistake. be able to. In addition, there is no cost advantage because it is not necessary to add a new protection circuit.

  According to a second aspect of the invention, in the control device according to the first aspect of the invention, the operation mode is to restart after the specified time, and in the case of the intermediate dewatering step of rinsing, after the rotating drum has reached the target rotation speed after dewatering start , And the rinsing process operation is continued.

  Thus, by continuing the operation of the rinsing step after the drum has reached the target rotation speed after the start of dehydration, the operation can be continued from the rinsing step to complete the operation.

  According to a third aspect of the present invention, in the first aspect, the restart counter unit counts the number of restarts after the predetermined period.

  This makes it possible to count the number of restarts after the prescribed period.

  In a fourth aspect of the invention, in the control device according to the third aspect of the invention, when the number of restart counter portions is a prescribed number of times, the operation mode of restarting after a prescribed time is dehydration in the intermediate dehydration operation of the rinsing step. After completion of the specified amount water supply operation after start-up, the drainage operation is performed, and after the water level has decreased to the specified amount, the operation of the intermediate dehydration process of rinsing is continued.

  Thereby, when the number of restart counters is a prescribed number, if the operation mode to be restarted after a prescribed time is an intermediate dewatering operation of the rinsing step, the dehydration operation is not continued immediately after the prescribed time, and the prescribed amount in the water supply mode By draining after the water supply operation until it reaches to, even when foam of detergent is staying around the rotating drum, the foam can be drained and operation can be continued, and the operation mode is completed Can.

  According to a fifth aspect of the present invention, the control device of the first aspect performs the cloth amount detecting operation from the beginning of the cloth amount detecting step when the operation mode for restarting after the prescribed period is in the middle of the cloth amount detecting step. After the calculation of the amount and the remaining time is completed, the detergent amount and the remaining time are displayed on the operation display unit.

  Thus, the operation of detecting the amount of clothes and the remaining time are repeated after the calculation of the amount of cloth and the remaining time is completed, and the operation mode is normally completed by displaying the amount of detergent and the remaining time. It can be done.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1
1 is a cross-sectional view of a drum-type washing machine according to Embodiment 1 of the present invention, FIG. 2 is a block diagram of the control circuit, and FIG. 3 is a voltage waveform diagram applied to a motor of the drum-type washing machine. FIG. 4 is a control flowchart of a motor drive motor of the drum type washing machine, and FIG. 5 is a control operation flowchart of the washing machine showing an embodiment of the present invention.

  As shown in FIG. 1, the rotary drum 20 is formed in a cylindrical shape with a bottom, and a large number of water flow holes 21 are provided on the entire surface of the rotary drum 20 and rotatably disposed in the water tank 22. The rotary drum 20 is provided with a rotation axis (rotation center axis) 23 in the substantially inclined direction at the rotation center of the rotation drum 20, and the axial center direction of the rotation axis 23 of the rotation drum 20 is directed downward from the front side to the back side. It is arranged in an inclined manner. In the present embodiment, a motor is attached to the outer bottom surface of the water tank 22 as the motor 24, and the rotation of the motor 24 is achieved by the drive pulley 25 fixed to the rotation shaft of the motor 24 and the end of the rotation shaft 23. It is transmitted to the rotary shaft 23 by the V-belt 27 stretched between the fixed driven pulley 26 and the rotary drum 20 to rotate the rotary drum 20 in the forward and reverse directions. Several protruding plates 28 are provided on the inner wall surface of the rotary drum 20, and the soaking operation of soaking up and dropping the clothes in the rotational direction as the rotary drum 20 rotates is performed to perform so-called washing.

  An upward inclined surface 29a is formed on the front side of the washing machine body 29, and an opening 29b is provided in the upward inclined surface 29a. The opening 29 b is covered with a lid 30 so as to be openable and closable, and by opening the lid 30, washing is performed inside the rotary drum 20 via the water tank clothing inlet / outlet 22 a of the water tank 22 and the rotary drum clothing inlet / outlet 20 a of the rotary drum 20. I am making it possible to put things in and out. In addition, the lid 30 is provided with a lid lock 31 to maintain the safety of the user during driving operation, and during the driving operation, the lid lock 31 is operated to prevent the lid 30 from being opened. ing.

  The water tank 22 is swingably suspended from the washing machine main body 29 by a spring 31 and a damper 32 so as to be supported by vibration isolation. One end of a drainage path 33 is connected to the lower part of the water tank 22, and the other end of the drainage path 33 is connected to the drainage valve 19 so that the washing water in the water tank 22 is drained.

  A detergent case 35 is provided at an upper front portion of the washing machine body 29, and the detergent case 34 for containing the detergent is accommodated in the detergent case 35 so as to be freely drawn out. The detergent case 35 is connected to a first water supply hose (first water supply path) 37a communicating with a water supply valve (water supply means) 36 provided at the upper rear portion of the washing machine main body 29. A second water supply hose (first water supply path) 37b in communication with the second water supply hose is connected.

  Then, by opening the water supply valve 36, tap water is supplied to the detergent case 35 through the first water supply hose 37a, and after tap water is sprinkled on the detergent input box 34, together with the tap water and the detergent The water is introduced into the water tank 22 through the second water supply hose 37b. In the detergent case 35, one end of a third water supply hose 37c (second water supply path) is connected in the vicinity of the connection portion of the first water supply hose 37a, and the other end of the third connection hose 37c is a rotating drum. It is connected to the water supply mouth ring 38 opened to the position which supplies water toward the inside of the rotating drum 20 from the front opening 20a of 20. As shown in FIG.

  An operation display unit 45 having an operation unit and a display unit is disposed above the front of the washing machine main body 29. The operation unit sets each process of washing and the like, and the operation unit sets the processes etc. It is configured to be displayed on the display unit.

  The water tank 22 is provided with water level detection means 39 for detecting the water level in the water tank 22. Further, the inner bottom portion of the water tank 22 is provided with a heater 40 for heating the washing water and a temperature detecting means 41 for detecting the temperature of the washing water, and the heater 40 and the temperature detecting means 41 It has a function to wash hot water.

  Next, a method of driving the motor and the like will be described based on FIG. 2, FIG. 3 and FIG.

  As shown in FIG. 2, the control device 49 is composed of a microcomputer and the like, and has a memory 65 and the like. The memory 65 stores the contents of the operation of each process such as washing, rinsing and dewatering, and programs such as the execution order of the processes. The control device 49 controls the motor 24 while controlling the opening and closing of the water supply valve 36 and the ON / OFF switching of the drainage valve 34 based on the program stored in the memory 65. The control device 49 performs setting of each process of washing based on the operation of the operation unit of the operation display unit 45, and displays the reservation time of washing and the progress of operation on the display unit of the operation display unit 45.

  The AC voltage output from the commercial power source 24 is supplied to the rectifier circuit 55 and converted into a pulsating DC voltage by the rectifier circuit 55. The rectifier circuit 55 uses a diode bridge. The DC voltage rectified by the rectification circuit 55 is smoothed by smoothing capacitors 56a and 56b. The positive polarity side of the capacitor 56 a is connected to the positive output terminal of the rectifier circuit 55. The negative polarity side of the capacitor 56 a and the positive polarity side of the capacitor 56 b are connected to the side not connected to the commercial power supply 24. The negative polarity side of the capacitor 56 b is connected to the negative output terminal of the rectifier circuit 55. The DC voltage smoothed by the capacitors 56a and 56b is supplied to the power supply on the P side of the IGBT. A direct current voltage detection unit 67 is provided, and the motor 24 is temporarily stopped when the direct current voltage detected by the direct current voltage detection unit 67 exceeds a threshold.

  Although the circuit configuration of the converter unit in FIG. 2 is a specification for domestic use, the commercial power supply 24 is voltage doubled and converted from AC voltage to DC voltage, but in the case of specifications for overseas use, full wave The other configuration is the same as that of the rectifier circuit.

  The IPM 53 is a switching means for converting a DC voltage into a three-phase AC voltage: three upper arm IGBTs, 58a for UP, 58b for VP, 58c for WP, 3 IGBTs for the lower arm, UN for 59a, VN 59b, WN 59c in a three-phase full-wave bridge configuration, and three FRDs (reflux diodes) 60a, 60b, 60c connected in anti-parallel to the IGBTs on the upper arm side, and IGBTs on the lower arm side The three FRDs (reflux diodes) 62a, 62b and 62c connected in reverse parallel to each other, and although not shown in the figure, the HVIC (control IC) of the upper arm side IGBT and the control IC (LVIC of the lower arm side) ) When a signal is input from the microcomputer, the lower arm IGBT is turned off to protect the CIN terminal, and when the protection works, the 64 IGBT driving units 41 of the microcomputer receive the IPM 5 Each of the connection points of the IGBTs 58a to 58c and the IGBTs 59a to 58c corresponds to each phase (U phase, V phase, W phase of the motor 24). ) Are connected to the stator coils U, V, W). The gates of the IGBTs 58 a to 58 c and 59 a to 59 c are connected to the IGBT driving unit 41. The U-phase shunt resistor 62a is connected between the emitter of the lower arm side IGBT, UN 59a, and the ground, and the V-phase shunt resistor 62b is connected between the emitter of the lower arm side IGBT, VN 59b, and the ground, The W-phase shunt resistor 62c is connected between the emitter of the lower arm side IGBT, the emitter 59a of WN and the ground, changes the phase current of the motor 24 to a voltage, and the current detector 46 of the controller 49 For example, the phase current flowing from the U phase to the V phase, the V phase to the W phase, and the W phase to the U phase is detected.

  Since the sensor signal detection unit 42 for detecting the magnetic pole position of the motor 24, the DC voltage detection unit 67, the current detection unit 46, the memory 65, and the PWM control unit 43 are processed by the IGBT drive unit 41, When the DC voltage detected by the DC voltage detector 67 during control of the motor 24 based on the information of the IGBT driver 41 exceeds the threshold, it is temporarily stopped, and the number of restarts is counted after the specified time has elapsed. It has a start-up operation counter.

  The IGBT drive unit 41 performs PWM chopping with data from the PWM control unit 43 at several to several tens of kHz according to the modulation method. When controlling the rotation of the motor 24, the control device 49 drives so that the rotor position signals Hu, Hv, Hw and the sinusoidal voltages Eu, Ev, Ew supplied to the stator windings U, V, W are synchronized. A signal is output to the IGBT drive unit 41 to control the rotation of the motor 24.

  The voltage waveform applied to the motor 24 by the inverter circuit will be described with reference to FIG.

  FIG. 3 (a) shows the position signals Hu, Hv, Hw of the motor rotor, and FIG. 3 (b) shows the motor based on the position signals Hu, Hv, Hw of the motor rotor shown in FIG. 24. The voltage Eu applied to the U-phase stator winding Lu of the motor 24 (hereinafter referred to as applied voltage Eu) and the voltage Ev applied to the V-phase stator winding Lv when the motor 24 is driven steadily at a constant rotational speed , And an applied voltage Ev (hereinafter referred to as applied voltage Ew) applied to the W-phase stator winding Lw.

  The controller 49 operates as follows to obtain the applied voltages Eu, Ev, Ew. The gate drive signal of the IGBT is supplied to the gate of the IGBT 58a. Further, the drive signal P2 is supplied by the drive circuit 62 to the gate of the IBGT 59a. Thus, the voltage E0u applied to the U-phase stator winding Lu has a waveform with PWM (Pulse Width Modulation) as shown in FIG. 3). This waveform is substantially equivalent to the applied voltage Eu shown in FIG. 3 (b). In the inverter circuit 57, as shown in FIG. 3B, when the U phase is used as a reference, the applied voltage Ev delayed by 240 ° in electrical angle with respect to the applied voltage Eu is converted to the V phase stator winding V. An applied voltage Ew delayed in phase by 120 ° is applied to the W-phase stator winding Lw. The rotor of the motor 24 rotates in the forward rotation direction by applying sinusoidal voltages with phase differences to the respective phases of the motor 24 as described above.

  FIG. 4 shows a control flowchart of the motor drive motor.

  In FIG. 4, motor rotation control is started at step 200. At step 201, various initializations are performed, and at step 202, counting of the carrier signal generation circuit of the PWM control circuit 12a is started. At step 203, the PWM control unit is started according to the position signal of the sensor signal detection unit 42 of the motor rotor. The IGBT driver 41 is driven by 43. At step 204, the presence or absence of a carrier interrupt signal is detected.

  In step 204, when it is detected that an interrupt signal is generated, the process proceeds to step 205, where a carrier signal interrupt subroutine is executed. The priority of the carrier signal interrupt is the highest, except for the abnormal interrupt. Here, the electric angular velocity is detected by counting the carrier signal while the position signal of 60 ° (180 ° and 360 ° can be set) changing, and the memory 65 is detected according to the electric angle calculated from the electric angular velocity. The sine wave data is further called, and the PWM control data is obtained. In step 206, the IGBT drive unit 41 turns on and off the gates of the six IBGTs of the IPM to sinusoidally drive the motor 24.

  In step 207, the magnetic pole position of the rotor is detected by the Hall element, the edge signals 63a, 63b, 63c are detected by the sensor signal detection unit 42, and it is detected whether or not the interrupt signal is generated, and the interrupt signal is generated. If so, the process proceeds to step 208, where the position signal interruption subroutine is executed. The priority of the position signal interrupt is set after the carrier signal interrupt. Here, processing such as detection of rotation period and rotation number, setting of electrical angle every 60 ° (180 °, 360 ° can be set), calculation of electrical angle of one carrier signal period, etc. is executed.

  At step 209, the end of the stroke is judged. If the stroke is continued, the routine returns to step 203. If the stroke is ended, the routine proceeds to step 210 to turn off all the transistors (IGBTs). The counting is stopped, and in step 212, the process proceeds to the next step.

  FIG. 5 shows an operation sequence for temporarily stopping the motor 24 when the voltage detected by the DC voltage detection unit 67 exceeds the threshold of the specified value 1 during control of the motor 24 and restarting the motor 24 after the specified time has elapsed. It is the flowchart which showed.

  If it demonstrates in detail based on FIG. 5, it will be determined whether the motor 24 which is driving the rotating drum 20 in control is continuing at step 331. When the control of the motor 24 for driving the rotary drum is continued, the DC voltage is detected by the DC voltage detector 67 in step 332. In step 333 it is determined whether the DC voltage detected by the DC voltage detection unit 67 is greater than the threshold of the specified value 1 or not. If the DC voltage detected by the DC voltage detection unit 67 is larger than the threshold of the specified value 1 in step 333, the drum drive motor is temporarily stopped in step 334. It is determined from the information from the sensor signal detection unit 42 and the IGBT drive unit 41 that the motor 24 has completely stopped, and it is checked in step 335 whether a specified time has elapsed. When the defined period has elapsed in step 335, the motor 24 for driving the drum is restarted in step 336, and the operation mode before the temporary stop is continued in step 337.

  FIG. 6 is a flow chart showing an operation sequence when the voltage detected by the DC voltage detection unit 67 exceeds the threshold of the specified value 1 when the operation mode is the intermediate dehydration operation mode of rinsing.

  As described in detail with reference to FIG. 6, it is determined in step 351 whether the motor 24 driving the rotary drum 20 is in control. If the control of the drum drive motor 24 is continued in step 351, the DC voltage detection unit 67 detects a DC voltage in step 352. In step 353, it is determined whether the DC voltage detected by the DC voltage detection unit 67 in step 352 is larger than the threshold value of the specified value 1 or not. If the DC voltage is greater than the threshold value of the specified value 1 in step 353, the drum drive motor is temporarily stopped in step 354. It is determined from the information from the sensor signal detection unit 42 and the IGBT drive unit 41 that the motor 24 has completely stopped. When the motor 24 is completely stopped, it is determined in step 355 whether a specified time has elapsed. In step 356, it is determined whether the operation mode before temporarily stopping the motor 24 for driving the rotary drum 20 is the operation mode of the intermediate dewatering process of the rinse. In the case of the intermediate dehydration operation mode of the rinse, the dehydration operation mode is restarted in step 357, the speed control of the rotary drum 20 is performed in step 358 to the target rotation number, and the operation sequence of the rinse step operation is continued in step 359.

  The flowchart of FIG. 7 is a flowchart showing an operation sequence of restart in the following state.

  That is, during intermediate dewatering in the rinse operation mode, the load on the motor 24 increases due to the foam generated between the rotary drum 20 and the water tank 22, and if the foam is drained for some reason at this timing, the load drops sharply. Therefore, the motor 24 overshoots the target rotational speed by a large amount. The speed control causes the motor to decelerate from a rotational speed higher than expected, and the regenerative current from the motor 24 raises the DC voltage. When the DC voltage detected by the DC voltage detection unit 67 exceeds the threshold of the specified value 1, the motor 24 is temporarily stopped, and the motor 24 is restarted after the specified time. When restarted, the bubbles remaining between the rotary drum 20 and the water tank 22 increase as the number of rotations of the drum increases, and the bubbles increase, and the DC voltage detection unit 67 passes the specified value 1 threshold as before. , A restart counter unit 66 is provided, which counts the number of restarts, and is a flowchart showing an operation sequence of restart when the counter reaches two.

  As described in detail with reference to FIG. 7, it is determined in step 371 whether the motor 24 driving the rotary drum 20 is in control. If the control of the motor 24 is continuing in step 371, the direct current voltage is detected by the direct current voltage detection unit 67 in step 372, and the direct current voltage detected by the direct current voltage detection unit 67 in step 373 exceeds the specified value 1 threshold. It is determined whether the

  If the DC voltage detected in step 373 is larger than the threshold value of the specified value 1, then in step 374 the drum drive motor 24 is temporarily stopped. It is determined from the information from the sensor signal detection unit 42 and the IGBT drive unit 41 that the motor 24 has completely stopped, and it is determined in step 375 whether or not a prescribed time has elapsed. In step 377, it is determined whether or not the value of the restart operation counter is two.

  After the specified time has elapsed, the water supply process is performed in step 378, and water supply is performed up to the specified water level in step 379 to complete the water supply process. At step 380, a drainage process is performed to drain the foam remaining between the rotary drum 20 and the water tank 22. At step 381, drainage is performed to the prescribed water level, and when the water level reaches the prescribed water level, the drainage process is ended. At step 382, the intermediate dewatering operation mode of rinsing is restarted, and at step 383 the rinsing operation mode is continued.

  The flow chart of FIG. 8 is a flow chart showing an operation sequence of restart in the following state.

  That is, it is a flow chart showing an operation sequence when the voltage detected by the DC voltage detection unit 67 exceeds the threshold value of the specified value 1 when the operation mode is the cloth amount detection operation mode.

  If it demonstrates in detail based on FIG. 8, it will be determined whether the motor 24 which is driving the rotating drum 20 in control is continuing at step 401. If the control of the motor 24 is continuing in step 401, the DC voltage is detected by the DC voltage detection unit 67 in step 402, and the DC voltage detected by the DC voltage detection unit 67 in step 403 is larger than the specified value 1 threshold. It is determined whether or not. If the DC voltage detected by the DC voltage detection unit 67 is larger than the threshold value of the specified value 1, the motor 24 is temporarily stopped in step 404. In step 405, it is determined whether or not a predetermined time has elapsed, and when the predetermined time has elapsed, it is determined in step 406 whether the operation mode before temporarily stopping the motor 24 is a cloth amount detection operation mode.

  If the operation mode is the cloth amount detection operation mode, the motor is restarted at step 407, and the cloth amount detection sequence of the cloth amount detection mode is executed from the beginning at step 408. When the cloth amount detection mode is completed, the detergent amount and the remaining time are calculated from the cloth amount detection information in step 409, and the detergent amount and the remaining time are displayed on the operation display unit 45 in step 410.

  According to the present invention, a large amount of foam is generated between the rotating drum and the water tank, for example, when the user has put a large amount of detergent, and the foam flows rapidly after being overloaded, resulting in a light load. In this case, by stopping and restarting the rotating drum, it is possible to end the washing without power loss, which is useful for household and commercial washing machines.

Reference Signs List 20 rotating drum 22 water tank 24 motor 29 washing machine main body 41 IGBT drive unit 42 sensor signal detection unit 43 PWM control unit 45 operation display unit 46 current detection unit 49 control device 53 IPM
55 rectifier circuit 56a capacitor 56b capacitor 62a U-phase shunt resistor 62b V-phase shunt resistor 62c W-phase shunt resistor 64 controller 65 memory 66 restart counter unit 67 DC voltage detection unit

Claims (5)

A rotary drum which accommodates a laundry and is rotationally driven, a converter unit which converts an AC voltage from a commercial power source into a DC voltage by a rectifier circuit and a capacitor, and a motor which drives the rotary drum with a DC voltage of the converter unit Speed control of the motor based on a signal detected by an inverter unit that converts the rotation speed into a three-phase AC voltage, a sensor signal detection unit that detects the position of the rotor of the motor, and a signal detected by the sensor signal detection unit And a DC voltage detection unit for detecting a DC voltage of the converter unit, wherein the DC voltage detected by the DC voltage detection unit during a period when the motor is driven exceeds a threshold value. pause the motor when the restart counter by restarting after a specified period to continue the operation mode, counts the number of restarts The provided, when said restart counter unit has counted multiple reboots, after performing the draining step is carried out water supply step, a washing machine, characterized in that to continue the operation mode by restarting. The control device is characterized in that, in the case of an intermediate dewatering process of rinsing, the operation mode of restarting after a prescribed time is such that the rinsing process operation is continued after the rotating drum has reached the target number of revolutions after dewatering has been activated. The washing machine according to Item 1. The washing machine according to claim 1, further comprising a restart counter unit that counts the number of times of restart after the specified period. When the operation mode to restart after the specified time is the intermediate dewatering operation of the rinsing step when the number of restart counter sections is the specified number, the control device drains after completion of the specified amount water supply operation after the start of dewatering. A washing machine according to claim 3, characterized in that it operates and continues the intermediate dewatering operation of the rinsing after the water level has dropped to a defined amount. When the operation mode to restart after the specified period is in the middle of the cloth amount detection step, the control device performs the cloth amount detection operation from the beginning of the cloth amount detection step, and calculation of the cloth amount and remaining time is completed. The washing machine according to claim 1, wherein the amount of detergent and the remaining time are displayed on the operation display unit later.

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