JP2017070541A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine which is not powered down even when a voltage detected in a DC voltage detection part has exceeded a threshold value while a motor is driving.SOLUTION: The washing machine comprises: a rotary drum 20 for accommodating laundry; a converter part for converting a commercial power supply into a DC voltage using a rectifier circuit 55 and capacitors 56a, 56b; an inverter part for converting the DC voltage of the converter part into a three-phase AC voltage for rotationally controlling a motor 24 for driving the rotary drum 20; a sensor signal detection part 42 for detecting the position of a rotor of the motor 24; and a control device 49 for performing speed control of the motor 24 based on the signal detected by the sensor signal detection part 42. A DC voltage detection part 67 is provided for detecting the DC voltage of the converter part. The control device 49 stops the motor 24 temporarily when the DC voltage detected by the DC voltage detection part 67 has exceeded a threshold value while the motor 24 is driving, and after a predetermined period, it restarts the motor and continues the operation mode.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a washing machine that performs rotation control of a motor.

  Conventionally, in the case of a system in which a motor is controlled by inverter control, a washing machine supplies a voltage obtained by converting an AC voltage from a commercial electric power into a DC voltage by the converter unit to the inverter 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 controlled to decelerate, the regenerative current from the motor is regenerated to the smoothing capacitor of the converter unit, so that the DC voltage rises, but it is usually designed so that the DC voltage does not exceed the threshold value.

  If the DC voltage exceeds the threshold for some reason, the protection is activated and the main power supply relay is turned off to turn off the power. In addition, when the DC power supply circuit is provided with a discharge circuit composed of a power-type resistor and a switching element, and the DC voltage exceeds the threshold for a moment, the gate signal of the power element for driving the motor is turned off, and the switching element Thus, the discharge resistor is connected to consume the regenerative current (for example, Patent Document 1 and Patent Document 2).

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

  However, in the configuration according to the conventional Patent Document 1 and Patent Document 2, a power type large resistor or switch circuit is required at both ends of the DC circuit. The direct-current voltage rises to DC 280V to close to DC 500V, and a large resistor may have a current of 3 A or more flowing for a long time. Therefore, a configuration in which safety is taken into consideration as an ignition source is necessary.

  When adopting a conventional configuration for a washing machine, there is no space for sufficient safety measures inside the washing machine, and it is a configuration that combines expensive part costs, which causes an increase in cost and causes problems in the home. It is not realistic to use it in a washing machine

  In addition, as a problem in the case of a washing machine having a general configuration, a consumer electronics manufacturer starts the laundry by putting the laundry in the washing machine, and when the cloth amount detection operation is completed, the amount of detergent necessary for the operation indicator is increased. Since it is displayed, it is assumed that an appropriate amount of the displayed detergent can be put.

  However, some users assume that the cleaning power is higher when the amount of detergent displayed is higher than the amount of detergent displayed, and there are cases where the user puts more than twice as much.

  In particular, concentrated detergents, etc., have a product with extremely high foaming even in a small amount, and when such detergents are added more than twice, the foamed detergent may not drain well in the rinsing process after washing. . If the detergent has not been drained completely, when the intermediate dehydration operation mode of the rinsing process is entered with a large amount of foam accumulated between the drum and the cylinder, the rotation of the drum will increase rapidly, and there will be a gap between the drum and the cylinder. The remaining detergent foams further and a large load is generated on the motor that drives the drum. In this state, since the speed of the drum is controlled to a target rotational speed at a specified acceleration, the applied voltage of the motor and the current flowing through the winding also increase.

  If the foam stays between the drum and the receiving cylinder suddenly drains at a certain timing and the load suddenly decreases, the proportional gain of the speed feedback control is small, so the drum rotation speed is large. Overshoot the target speed. The control device controls the speed so as to decrease the applied voltage of the motor so as to decrease it to the target rotational speed by the speed food back control. Since the control device rapidly decelerates from a higher rotational speed than expected and attempts to return it to the target rotational speed, a high regenerative current is returned from the motor to the electrolytic capacitor of the converter unit, and the DC voltage increases rapidly. When the DC voltage rises above the specified value, the protection device works and the power relay is immediately turned off and the power is turned off, so the motor stops in a free run.

  In this case, the user thinks that the washing has been completed because the washing machine is turned off and the operation display unit has not been informed of the abnormality, so the washing machine is turned on, the door is opened, and the laundry is removed. If you try to pick it up, it is assumed that the laundry has not been dehydrated, and that it is misunderstood that the washing machine has failed, and that the manufacturer is requested to repair it. If the user has not been able to dehydrate the laundry, and the dehydration operation is attempted, the detergent remaining between the drum and the receiving tube will foam, causing the same phenomenon as described above, causing the power to drop and dehydrating. It is assumed that this is not possible.

  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 does not turn off even when the voltage detected by the DC voltage detection unit exceeds the threshold value while the motor is driven. The purpose is to provide a machine.

  In order to solve the above-described conventional problems, a washing machine of the present invention includes a rotating drum that accommodates laundry and is driven to rotate, and a converter unit that converts an AC voltage from a commercial power source into a DC voltage using a rectifier circuit and a capacitor. An inverter unit that converts a DC voltage of the converter unit into a three-phase AC voltage for rotational control of a motor that drives the rotary drum, and a sensor signal level detection unit that detects the position of the rotor of the motor; A controller for controlling the speed of the motor based on a signal detected by the sensor signal detector, and a DC voltage detector for detecting a DC voltage of the converter unit, the controller being driven by the motor. When the DC voltage detected by the DC voltage detector exceeds the threshold during the period, the motor is temporarily stopped and restarted after a specified period. It is obtained by a structure in which to continue.

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

Sectional drawing of the principal part of the washing machine in Embodiment 1 of this invention Block diagram of the control circuit Voltage waveform diagram applied to the motor Operation flowchart of the motor drive control Control operation flowchart in the same different state Control operation flowchart in different states Control operation flowchart in different states Control operation flowchart in different states

According to a first aspect of the present invention, there is provided a rotary drum that accommodates laundry and is driven to rotate, a converter unit that converts 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 unit. An inverter for converting the motor for driving the rotating drum into a three-phase AC voltage for controlling rotation, a sensor signal level detecting unit for detecting the position of the rotor of the motor, and the sensor signal detection A control device that controls the speed of the motor based on a signal detected by the control unit, a DC voltage detection unit that detects a DC voltage of the converter unit, and a period during which the motor is driven When the DC voltage detected by the DC voltage detection unit exceeds a threshold value, the motor is temporarily stopped and restarted after a specified period to continue the operation mode.

  As a result, even when the DC voltage detected by the DC voltage detection unit exceeds the threshold value while the motor is driven, the washing machine can be prevented from being turned off by temporarily stopping the motor. In addition, since the motor is temporarily stopped, the bubbles are removed and drained, and the operation can be continued by restarting after the lapse of the specified time. Even if a rare case where accidental bad conditions occur accidentally, the operation mode can be completed to the end, preventing the user from misjudging it as a malfunction and requesting repairs by mistake. be able to. Further, there is no need to add a new protection circuit, which is advantageous in terms of cost.

  According to a second aspect of the present invention, when the operation mode to be restarted after a specified time is the intermediate dehydration step of rinsing, the control device of the first aspect of the invention is after the rotating drum reaches the target rotational speed after the start of dehydration. The rinsing process is continued.

  Thus, after the drum reaches the target rotational speed after dehydration activation, the operation of the rinsing process is continued, so that the operation can be continued from the rinsing process and the operation can be completed.

  In a third aspect of the invention, in particular, in the first aspect of the invention, a restart counter unit that counts the number of restarts after the specified period is provided.

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

  According to a fourth aspect of the present invention, there is provided a control device according to the third aspect of the present invention, in which the dehydration is performed when the operation mode to be restarted after the specified time is the intermediate dehydration operation in the rinsing process when the number of restart counters is the specified number. A drainage operation is performed after the start of the specified amount water supply operation after activation, and the rinsing intermediate dehydration step operation is continued after the water level has decreased to the specified amount.

  As a result, when the number of restart counters is the specified number of times and the operation mode to be restarted after the specified time is the intermediate dehydration operation in the rinsing process, the dewatering operation is not continued immediately after the specified time, and the specified amount in the water supply mode. By draining after the water supply operation until it reaches, even if detergent bubbles stay around the rotating drum, the bubbles can be drained, the operation can be continued, and the operation mode must be completed. Can do.

  According to a fifth aspect of the present invention, when the operation mode to be restarted after the specified period is in the middle of the cloth amount detection process, the control device of the first invention performs the cloth amount detection operation from the beginning of the cloth amount detection process. 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.

  As a result, the cloth amount detection operation is restarted from the beginning of the cloth amount detection process, and after the calculation of the cloth amount and the remaining time is completed, the detergent mode and the remaining time are displayed on the operation display unit, thereby completing the operation mode normally. Can be made.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

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

  As shown in FIG. 1, the rotary drum 20 is formed in a bottomed cylindrical shape, and a large number of water passage holes 21 are provided on the entire surface of the outer periphery, and are rotatably disposed in a water tank 22. The rotary drum 20 is provided with a rotation shaft (rotation center axis) 23 in a substantially inclined direction at the rotation center of the rotation drum 20, and the axial center direction of the rotation shaft 23 of the rotation drum 20 is directed downward from the front side toward the back side. Inclined. In the present embodiment, a motor is attached to the outer bottom surface of the water tank 22 as a motor 24, and the rotation of the motor 24 is performed on a drive pulley 25 fixed to the rotation shaft of the motor 24 and an end portion 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 rotates the rotary drum 20 in the forward and reverse directions. Several protruding plates 28 are provided on the inner wall surface of the rotating drum 20, and a stirring operation of lifting and dropping clothes in the rotating direction as the rotating drum 20 rotates, so-called scrubbing is performed.

  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 29b is covered with a lid 30 so as to be freely opened and closed. You can take things in and out. The lid 30 is provided with a lid lock 31 for maintaining the safety of the user during the driving operation, and the lid lock 31 is operated during the driving operation so that the lid 30 does not open. ing.

  The water tub 22 is suspended from the washing machine body 29 by a spring 31 and a damper 32 so as to be swingable and is supported in a vibration-proof manner. One end of the 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 drain valve 19 so that the washing water in the water tank 22 is drained.

  A detergent case 35 is provided at the upper front portion of the washing machine body 29, and a detergent charging box 34 for storing detergent is housed 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) 37 a that communicates with a water supply valve (water supply means) 36 provided at the upper rear part of the washing machine body 29, and the water tank 22. The 2nd water supply hose (1st water supply path) 37b connected to is connected.

  Then, tap water is supplied to the detergent case 35 via the first water supply hose 37a by opening the water supply valve 36, and after the tap water is sprinkled on the detergent charging box 34, the tap water and the detergent are used together. It is introduced into the water tank 22 through the second water supply hose 37b. One end of a third water supply hose 37c (second water supply path) is connected to the detergent case 35 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. 20 is connected to a water supply base 38 that opens to a position where water is supplied from the front opening 20 a toward the inside of the rotary drum 20.

  An operation display unit 45 including an operation unit and a display unit is disposed above the front portion of the washing machine body 29, and each process of washing is set by the operation unit. It is configured to display 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. In addition, a heater 40 for heating the washing water and a temperature detection means 41 for detecting the temperature of the washing water are provided at the inner bottom of the water tub 22, and the laundry in the rotary drum 20 is removed by the heater 40 and the temperature detection means 41. Has the function of washing with warm water.

  Next, a motor driving method and the like will be described based on FIGS. 2, 3, and 4.

  As shown in FIG. 2, the control device 49 includes a microcomputer and has a memory 65 and the like. The memory 65 stores the contents of the operation of each process such as washing, rinsing, dehydration, etc., and the execution order of the processes. The control device 49 controls the opening and closing of the water supply valve 36 and the ON / OFF switching of the drain valve 34 and the motor 24 based on a 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 laundry reservation time and the progress of the operation on the display unit of the operation display unit 45.

  The AC voltage output from the commercial power supply 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 rectifier circuit 55 is smoothed by the 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 source 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 DC voltage detector 67 is provided, and the motor 24 is temporarily stopped when the DC voltage detected by the DC voltage detector 67 exceeds a threshold value.

  The circuit configuration of the converter unit in FIG. 2 is a specification for domestic use, and the commercial power supply 24 is voltage doubled rectified to convert it from an AC voltage to a DC voltage. It becomes a rectifier circuit, and other configurations are the same.

  The IPM 53 is a switching means for converting a DC voltage into a three-phase AC voltage. Three upper arm IGBTs, UP is 58a, VP is 58b, WP is 58c, and three lower arm IGBTs and UN are Three FRDs (freewheeling diodes) 60a, 60b, and 60c connected in reverse parallel to the upper arm side IGBT, and the lower arm side IGBT The three FRDs (freewheeling diodes) 62a, 62b, 62c connected in reverse parallel to the HVIC (control IC) of the IGBT on the upper arm side and the control IC (LVIC) on the lower arm side are not shown in the figure. ) When a signal is input from the microcomputer, the CIN terminal that turns off and protects the IGBT on the lower arm side, and when the protection is activated, the IGBT drive unit 41 of the microcomputer 64 is connected to the IPM5. , The FO terminals for turning off the gate drive signals of the IGBTs, and the connection points of the IGBTs 58a to 58c and the IGBTs 59a to 58c are the respective phases (U phase, V phase, W phase) of the motor 24. ) 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 IGBT, UN 59a and the ground, and the V-phase shunt resistor 62b is connected between the lower arm IGBT, VN 59b emitter and the ground, The W-phase shunt resistor 62c is connected between the lower arm IGBT, WN 59a emitter and the ground, and changes the phase current of the motor 24 to a voltage. For example, the phase current flows from the U phase to the V phase, from the V phase to the W phase, and from the W phase to the U phase.

  Since the information of the sensor signal detection unit 42 that detects 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 is processed by the IGBT drive unit 41, When the DC voltage detected by the DC voltage detection unit 67 during control of the motor 24 based on the information of the IGBT drive unit 41 exceeds the threshold value, the motor 24 is temporarily stopped, and the number of restarts after the lapse of the specified time is counted. A start-up counter is provided.

  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 controller 49 is driven 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.

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

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

  The control device 49 operates as follows in order 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 to the gate of the IBGT 59a by the drive circuit 62. As a result, the voltage E0u applied to the U-phase stator winding Lu has a PWM (Pulse Width Modulation) waveform as shown in FIG. This waveform is substantially equivalent to the applied voltage Eu shown in FIG. As shown in FIG. 3B, the inverter circuit 57 applies an applied voltage Ev, which is delayed by 240 ° in electrical angle to the applied voltage Eu, to the V-phase stator winding V when the U phase is used as a reference. The applied voltage Ew having a phase delay of 120 ° is applied to the W-phase stator winding Lw. Thus, by applying a sinusoidal voltage with a phase shift to each phase of the motor 24, the rotor of the motor 24 rotates in the forward direction.

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

  In FIG. 4, motor rotation control is started in step 200. In step 201, various initial settings are performed. In step 202, the carrier signal generation circuit of the PWM control circuit 12a starts counting. In step 203, the PWM control unit is controlled according to the position signal of the sensor signal detection unit 42 of the motor rotor. 43 drives the IGBT drive unit 41. In step 204, the presence or absence of a carrier interrupt signal is detected.

  If the generation of an interrupt signal is detected in step 204, the process proceeds to step 205 to execute a carrier signal interrupt subroutine. The priority of the carrier signal interrupt is the highest priority except for the abnormal interrupt. Here, the electrical angular velocity is detected by counting the carrier signal while the position signal of 60 ° (180 ° and 360 ° can be set) is changed, and the memory 65 is detected according to the electrical angle calculated from the electrical angular velocity. Then, the sine wave data is called and used as PWM control data, and in step 206, the gates of the six IBGTs of the IPM are turned on and off by the IGBT drive unit 41 to drive the motor 24 in a sine wave.

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

  In step 209, the end of the process is determined. If the process is continued, the process returns to step 203. If the process is completed, the process proceeds to step 210. After all the transistors (IGBTs) are turned off, the process proceeds to step 211. The count is stopped and the process proceeds to the next step in step 212.

  FIG. 5 shows an operation sequence in which the motor 24 is temporarily stopped when the voltage detected by the DC voltage detector 67 during control of the motor 24 exceeds the threshold value of the specified value 1, and the motor 24 is restarted after the specified time has elapsed. It is the flowchart which showed.

  Explaining in detail based on FIG. 5, it is determined in step 331 whether or not the motor 24 driving the rotary drum 20 is under control. When the motor 24 for driving the rotating drum is under control, the DC voltage is detected by the DC voltage detector 67 in step 332. In step 333, it is determined whether or not the DC voltage detected by the DC voltage detection unit 67 is greater than the threshold value of the specified value 1. If the DC voltage detected by the DC voltage detector 67 in step 333 is greater than the threshold value of the prescribed value 1, the drum driving 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 been completely stopped, and it is checked in step 335 whether a specified time has elapsed. When the specified period of time has elapsed in step 335, the drum driving motor 24 is restarted in step 336, and the operation mode before the temporary stop in step 337 is continued.

  FIG. 6 is a flowchart showing an operation sequence when the voltage detected by the DC voltage detection unit 67 exceeds the threshold value of the prescribed value 1 when the operation mode is the rinse intermediate dehydration operation mode.

  Explaining in detail with reference to FIG. 6, it is determined in step 351 whether the motor 24 driving the rotary drum 20 is continuing control. If the drum driving motor 24 is continuing to be controlled in step 351, the DC voltage detector 67 detects a DC voltage in step 352. In step 353, it is determined whether or not 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. If the DC voltage is greater than the threshold value of the specified value 1 in step 353, the drum driving 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 or not 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 dehydration process of rinsing. In the case of the intermediate dehydration operation mode of rinsing, the dehydration operation mode is restarted in step 357, the speed of the rotary drum 20 is controlled to the target rotational speed in step 358, and the operation sequence of the rinsing process operation is continued in step 359.

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

  That is, during the intermediate dehydration in the rinsing operation mode, the load on the motor 24 increases due to bubbles generated between the rotating drum 20 and the water tank 22, and if the bubbles are drained for some reason at this timing, the load decreases rapidly. Therefore, the motor 24 greatly overshoots the target rotational speed. The speed control decelerates from the number of revolutions higher than expected, and the DC voltage increases due to the regenerative current from the motor 24. The motor 24 is temporarily stopped when the DC voltage detected by the DC voltage detector 67 exceeds the threshold value of the specified value 1, and the motor 24 is restarted after the specified time. When restarted, the foam remaining between the rotating drum 20 and the water tank 22 increases as the number of rotations of the drum increases, and the DC voltage detection unit 67 exceeds the threshold value of the prescribed value 1 as in the previous case. FIG. 5 is a flowchart showing a restart operation sequence when a restart counter unit 66 is provided, the number of restarts is counted, and the counter reaches 2. FIG.

  Explaining in detail based on FIG. 7, it is determined in step 371 whether or not the motor 24 driving the rotary drum 20 is under control. When the motor 24 is continuing control in step 371, the DC voltage is detected by the DC voltage detector 67 in step 372, and the DC voltage detected by the DC voltage detector 67 in step 373 exceeds the threshold value of the specified value 1. It is determined whether or not.

  If the DC voltage detected in step 373 is larger than the threshold value of the prescribed value 1, the drum driving motor 24 is temporarily stopped in step 374. It is determined from 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 specified time has elapsed. In step 377, it is determined whether or not the value of the restart operation counter is 2.

  After the lapse of the specified time, a water supply process is performed in step 378, and water is supplied to the specified water level in step 379, and the water supply process is terminated. In step 380, a draining process is performed to drain the foam remaining between the rotating drum 20 and the water tank 22. In step 381, the water level is drained to a specified level, and when the water level reaches the specified level, the draining process is terminated. In step 382, the operation is restarted in the intermediate dehydration operation mode of rinsing, and in step 383, the rinsing operation mode is continued.

  The flowchart in FIG. 8 is a flowchart showing a restart operation sequence in the following state.

  That is, this is a flowchart 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.

  Explaining in detail based on FIG. 8, it is determined in step 401 whether or not the motor 24 driving the rotary drum 20 is under control. When the control of the motor 24 is continued in step 401, the DC voltage is detected by the DC voltage detector 67 in step 402, and the DC voltage detected by the DC voltage detector 67 in step 403 is larger than the threshold value of the specified value 1. It is determined whether or not. If the DC voltage detected by the DC voltage detector 67 is greater 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 the specified time has elapsed. When the specified time has elapsed, in step 406, it is determined whether the operation mode before temporarily stopping the motor 24 is the cloth amount detection operation mode.

  If the operation mode is the cloth amount detection operation mode, the motor is restarted in step 407, and the cloth amount detection sequence in the cloth amount detection mode is executed from the beginning in 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, when a user puts in a large amount of detergent, a large amount of bubbles are generated between the rotating drum and the water tank, and after the overload, the bubbles suddenly flow and lightly load. In such a case, the rotating drum can be temporarily stopped and restarted, so that the washing can be completed without powering down, which is useful for home and commercial washing machines.

DESCRIPTION OF SYMBOLS 20 Rotating drum 22 Water tank 24 Motor 29 Washing machine main body 41 IGBT drive part 42 Sensor signal detection part 43 PWM control part 45 Operation display part 46 Current detection part 49 Control apparatus 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 rotating drum that accommodates laundry and is driven to rotate, a converter unit that converts an AC voltage from a commercial power source into a DC voltage using a rectifier circuit and a capacitor, and a motor that drives the rotating drum using the DC voltage of the converter unit An inverter unit that converts a three-phase AC voltage to control rotation of the motor, a sensor signal detection unit that detects the position of the rotor of the motor, and a speed control of the motor based on a signal detected by the sensor signal detection unit A DC voltage detection unit that detects a DC voltage of the converter unit, and the control device is configured such that the DC voltage detected by the DC voltage detection unit exceeds a threshold value while the motor is driven. The washing machine is characterized in that the motor is temporarily stopped and restarted after a specified period to continue the operation mode. When the operation mode to be restarted after a specified time is an intermediate dehydration step of rinsing, the control device continues the rinsing step operation after the rotating drum reaches a target rotational speed after the start of dehydration. Item 2. A washing machine according to Item 1. The washing machine according to claim 1, further comprising a restart counter unit that counts the number of restarts after the specified period. When the operation mode to be restarted after the specified time is the intermediate dehydration operation in the rinsing process when the number of times of the restart counter is the specified number of times, the control device drains after the completion of the specified amount water supply operation after the start of the dehydration. 4. The washing machine according to claim 3, wherein the operation is continued and the intermediate dehydration process of rinsing is continued after the water level has dropped to a specified amount. When the operation mode to be restarted after a specified period is in the middle of the cloth amount detection process, the controller performs the cloth amount detection operation from the beginning of the cloth amount detection process, and the calculation of the cloth amount and the remaining time is completed. 2. 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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