JP2016198303A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of improving accuracy and reliability of clutch switching even when power source voltage changes.SOLUTION: A washing machine of the embodiment rotates a pulsator and a dewatering tub by using an induction motor. The washing machine has a clutch for performing switching between a first state for transmitting a driving force from the induction motor only to a rotary shaft of the pulsator and a second state for transmitting the driving force from the induction motor to the rotary shaft of the pulsator and the rotary shaft of the dewatering tub. Also, it has a voltage detection part for detecting a power source voltage applied to the induction motor, and at the switching operation of the clutch, it performs an auxiliary operation of the clutch switching by imparting a predetermined electric conduction pattern to the induction motor. Then, according to the level of the power source voltage detected by the voltage detection part, the electric conduction pattern is changed.SELECTED DRAWING: Figure 5

Description

  Embodiments described herein relate generally to a washing machine.

  Conventionally, in a washing machine that drives a laundry basket with an induction motor, a predetermined energization pattern may be applied to the induction motor in order to assist switching of the clutch. In addition, the induction motor is easily affected by fluctuations in the power supply voltage, and the operation amount and operation speed of the induction motor change. Therefore, when the voltage is low, the operation amount of the induction motor becomes small and the operation speed becomes slow, so that clutch switching may not be performed normally. On the other hand, when the voltage is high, the amount of operation of the induction motor is increased, and the operation speed is increased, so that a load is applied to the clutch. For example, a mechanical failure may be induced. In addition, in a region where domestic solar power generation is widespread and overseas power supply conditions are unstable, the power supply voltage often fluctuates, and the necessity of considering voltage fluctuation in clutch switching has increased.

JP-A-11-090081 JP-A-11-169590

  Thus, a washing machine is provided that can improve the accuracy and reliability of clutch switching even when the power supply voltage changes.

  The washing machine according to the embodiment rotates the pulsator and the dewatering tub using an induction motor. This washing machine has a first state in which the driving force from the induction motor is transmitted only to the rotating shaft of the pulsator, and a second state in which the driving force from the induction motor is transmitted to the rotating shaft of the pulsator and the rotating shaft of the dewatering tank. It has a clutch for switching. In addition, it has a voltage detection unit that detects a power supply voltage applied to the dielectric motor, and performs an auxiliary operation of switching the clutch by applying a predetermined energization pattern to the induction motor during the clutch switching operation. And an energization pattern is changed according to the level of the power supply voltage detected by the voltage detection part.

1 is a longitudinal side view schematically showing the overall configuration of a washing machine according to a first embodiment. Enlarged longitudinal sectional view of the drive mechanism at the clutch wash position Enlarged longitudinal sectional view of the drive mechanism at the clutch dewatering position The block diagram which shows the electric constitution of the washing machine which concerns on embodiment The figure which shows the electricity supply pattern (energization timing) to the motor of the switch auxiliary | assistance operation | movement at the time of clutch switching at the time of shifting to the spin-drying | dehydration process in 1st Embodiment. Diagram showing voltage waveform of AC power supply The figure which shows the electricity supply pattern (energization timing) to the motor at the time of the switch auxiliary | assistance operation | movement at the time of clutch switching at the time of shifting to the washing process from the dehydration process in 1st Embodiment. The figure which shows the electricity supply pattern (energization timing) to the motor of the switch auxiliary | assistance operation | movement at the time of clutch switching at the time of shifting to the spin-drying | dehydration process in 2nd Embodiment. The figure which shows the electricity supply pattern (energization timing) to the motor at the time of the switch auxiliary | assistance operation | movement at the time of clutch switching at the time of shifting to the washing process from the dehydration process in 2nd Embodiment. The figure which shows the electricity supply pattern (voltage waveform) to the motor at the time of the switching auxiliary | assistant operation | movement at the time of clutch switching in 3rd Embodiment. The figure which shows the electricity supply pattern (voltage waveform) to the motor at the time of the switching auxiliary | assistant operation | movement at the time of clutch switching in 4th Embodiment. The figure which shows the electricity supply pattern (energization timing) used for the additional switching assistance operation at the time of clutch switching in 5th Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the substantially same element in each embodiment, and description is abbreviate | omitted. In the following description, the energization pattern may mean, for example, energization timings shown in FIGS. 5, 7, 8, 9, and 12 described later, and for example, FIGS. 10 and 11 described later. The voltage waveform shown in FIG.

(First embodiment)
Hereinafter, the washing machine according to the first embodiment will be described with reference to FIGS. 1 to 7. First, FIG. 1 shows a schematic configuration of the washing machine 1. Here, in the outer box 2 having a substantially rectangular box shape, a water tank 3 for receiving water during dehydration or the like is provided via an elastic suspension mechanism 4. And in the said water tank 3, the rotating tank 5 as a washing tank and a dehydration tank in which the laundry is accommodated in the inside is rotatably provided, and the bottom part in the rotating tank 5 is used for water flow generation. The stirring body (pulsator) 6 is provided.

  As shown in FIGS. 2 and 3, on the outer bottom portion of the water tank 3, a driving motor 7 and a driving mechanism portion 9 to which a rotational driving force of the motor 7 is transmitted via a belt transmission mechanism 8. Is provided. The motor 7 is constituted by an induction motor. The configuration of the drive mechanism unit 9 will be described later.

  The motor 7, the belt transmission mechanism 8, and the drive mechanism unit 9 cause the stirring body 6 to rotate forward and backward in a detergent washing and rinsing operation, thereby generating a stirring water flow in the rotating tank 5. The rotary tank 5 is rotated integrally with the stirring body 6 at a high speed. In addition, although illustration in FIG. 1 is abbreviate | omitted, the drain valve 71 etc. for draining from the said rotating tank 5 etc. are provided in the bottom part of the said water tank 3 (refer FIG. 4).

  On the other hand, a balance ring 10 is attached to the upper end portion of the rotary tub 5 and a dewatering hole 11 is provided for draining the rotary tub 5 during dehydration through the balance ring 10. ing. In addition, a bowl cover 12 having a substantially ring shape is provided at the upper end of the water tank 3. A plastic top cover 13 is provided at the upper end of the outer box 2.

  The top cover 13 has a substantially circular laundry entrance at the center, and a bi-fold type lid 14 for opening and closing the laundry entrance. Although not shown, a water supply mechanism having a water supply valve or the like is provided on the rear side of the top cover 13, and an operation input unit (operation panel) 61 or the like is provided on the front side of the top cover 13. A control device 60 that mainly controls the washing machine 1 is provided (see FIG. 4).

  Here, the drive mechanism 9 will be described with reference to FIGS. FIG. 2 shows a state where the clutch 15 is in the washing position (the raised position), and FIG. 3 shows a state where the clutch 15 is in the dewatering position (the lowered position). A bearing housing 16 is attached to the outer bottom of the water tank 3. The bearing housing 16 is configured by connecting an upper frame 17 and a lower frame 18 at an outer peripheral side portion. A cylindrical portion 17 a that protrudes upward is formed at the center of the upper frame 17, and a cylindrical portion 18 a that protrudes downward is formed at the center of the lower frame 18.

  A bearing 19 made of a ball bearing is fitted and fixed in the cylindrical portion 17 a, and a hollow (circular tubular) upper tank shaft 20 is provided supported by the bearing 19. A flange portion 20a is integrally provided at the upper end portion of the upper tank shaft 20, and the rotating tank 5 is fixed to the flange portion 20a. An upper stirring shaft 21 is inserted into the hollow portion of the upper tank shaft 20 so as to penetrate vertically. At this time, the upper stirring shaft 21 is rotatably supported via bearing metals 22 and 23. The upper end of the upper stirring shaft 21 is connected to the stirring body 6. A seal member 24 is provided between the inner peripheral surface of the upper end of the cylindrical portion 17 a and the outer peripheral surface of the upper tank shaft 20.

  On the other hand, a bearing 25 made of a ball bearing is fitted and fixed in the cylindrical portion 18a of the lower frame 18, and a hollow (circular tubular) lower tank shaft 26 is provided supported by the bearing 25. In the hollow portion of the lower tank shaft 26, a lower stirring shaft 27 is vertically supported and rotatably supported through bearing metals 28 and 29. A driven pulley 30 is attached to the lower end portion of the lower stirring shaft 27, and a boss portion 31 is fixedly positioned on the upper surface portion of the driven pulley 30. Thereby, the boss portion 31 rotates integrally with the lower stirring shaft 27.

  The motor 7 is provided downward on the lower surface side of the upper frame 17, and a drive pulley 32 is attached to the output shaft 7a. A V-belt 33 is stretched between the driving pulley 32 and the driven pulley 30. As a result, the belt transmission mechanism 8 is configured, and the rotation of the motor 7 is indirectly transmitted to the lower stirring shaft 27 and rotated.

  The upper tank shaft 20 and the lower tank shaft 26 are connected by a gear case 34, and the upper stirring shaft 21 and the lower stirring shaft 27 are constituted by a planetary gear device disposed in the gear case 34. It is connected via a reduction gear mechanism 35. At this time, the gear case 34 has a large cylindrical shape with an open bottom surface, and integrally includes a protruding cylindrical portion 34a having a small diameter on the upper surface portion. The protruding cylindrical portion 34 a is connected to the lower end portion of the upper tank shaft 20. A flange-like portion 26a that extends in the outer peripheral direction is integrally provided at the upper end portion of the lower tank shaft 26, and the flange-like portion 26a closes the lower surface of the gear case 34 so that the gear case 34 It is connected to the lower end.

  The reduction gear mechanism 35 includes an external gear 36 provided at the upper end of the lower stirring shaft 27, an internal gear 37 provided on the inner peripheral surface portion of the gear case 34, and between the external gear 36 and the internal gear 37. A plurality of (for example, three) planetary gears 38 provided, and a carrier 39 provided so as to connect shaft portions of the plurality of planetary gears 38 are provided. The center portion of the carrier 39 is connected to the lower end portion of the upper stirring shaft 21.

  In a state where the clutch 15 is in the washing position (see FIG. 2), the lower tank shaft 26, the gear case 34, and the upper tank shaft 20 are separated from the stirring shafts 21 and 27 and fixed to the water tank 3 side (lower frame 18). Will come to be. In this state, the rotation of the lower stirring shaft 27 is decelerated by the reduction gear mechanism 35 and the upper stirring shaft 21 is rotated. Due to the rotation of the upper stirring shaft 21, the stirring body 6 is integrally rotated.

  On the other hand, when the clutch 15 is in the dewatering position (see FIG. 3), the lower tank shaft 26 is connected to the lower stirring shaft 27. As a result, the lower tank shaft 26, the gear case 34, the reduction gear mechanism 35, and the upper The tank shaft 20 and the upper stirring shaft 21 are integrally connected. In this state, the rotation of the lower stirring shaft 27 is transmitted to the upper tank shaft 20, and the rotating tank 5 is integrally rotated.

  As described above, the clutch 15 for connecting and disconnecting the lower tank shaft 26 and the lower stirring shaft 27 (boss portion 31) is provided on the lower outer peripheral portion of the lower tank shaft 26. Further, an elevating mechanism 40 as a clutch switching means for moving the clutch 15 up and down and switching its state is provided on the lower surface portion of the lower frame 18, and a co-rotation preventing portion 41 is provided.

  The clutch 15 has a substantially cylindrical shape as a whole. A circular hook-shaped (flange-shaped) engaged portion 42 is integrally formed at the upper end portion of the clutch 15. The engaged portion 42 is formed with a plurality of (for example, twelve) tooth portions 42a that are located on the outer peripheral portion of the upper surface and are arranged in the circumferential direction. The clutch 15 has an inner serration portion 43 extending in the vertical direction on the entire inner peripheral surface thereof.

  On the other hand, as shown in FIGS. 2 and 3, the lower half of the lower tank shaft 26 (the part protruding downward from the bearing 25) has an upper and lower portion corresponding to the inner serration portion 43. A serration portion 44 extending in the direction is formed. The clutch 15 is fitted into the outer periphery of the lower end of the lower tank shaft 26 so that the inner serration portion 43 is always engaged with the serration portion 44 so as to move up and down and rotate integrally in the circumferential direction. Yes. Between the upper surface of the clutch 15 and the inner ring of the bearing 25, a coil spring 45 is disposed at the outer peripheral portion of the lower tank shaft 26, and the clutch 15 is always biased toward the lowered position (dehydration position). Has been.

  At the lower end of the clutch 15, a plurality of, for example, four, fitting recesses 15 a and fitting projections 15 b that are fitted to the boss portion 31 are provided alternately in the circumferential direction. In this case, teeth 46 and recesses 47 into which the fitting recesses 15a and the fitting projections 15b are fitted are alternately provided on the upper surface of the boss 31 in the circumferential direction. The co-rotation preventing portion 41 is located on the outer peripheral portion of the cylindrical portion 18a and has an engaging portion 48 (concave portion) with which an engaged portion 42 (tooth portion 42a) at the upper end of the clutch 15 is engaged. ing.

  Thus, when the clutch 15 is in the lowered dewatering position shown in FIG. 3, the fitting concave portion 15 a and the fitting convex portion 15 b at the lower end of the clutch 15 are fitted into the upper surface of the boss portion 31. As a result, the lower stirring shaft 27 and the lower tank shaft 26 are connected to rotate integrally. On the other hand, when the clutch 15 is in the raised washing position shown in FIG. 2, it is disconnected from the boss portion 31, and the engaged portion 42 at the upper end of the clutch 15 is engaged with the engaging portion 48. (And the lower tank shaft 26) are fixed to the lower frame 18 (water tank 3) and cannot be rotated, and the lower stirring shaft 27 can be rotated.

  On the other hand, as shown in FIGS. 2 and 3, the elevating mechanism 40 includes a clutch lever 49 that moves the clutch 15 up and down, an operation lever 50 that swings the clutch lever 49, and the like. The clutch lever 49 is supported by a support portion 41a provided integrally with the co-rotation prevention portion 41 so that an intermediate portion thereof is swingable in the vertical direction, and a front end portion of the engaged portion 42 of the clutch 15 is supported. A contact portion (not shown) for engaging and pushing up on the lower surface side is provided. Further, as shown in FIG. 2, a tension coil spring 51 is disposed between the base end portion side of the clutch lever 49 and the support portion 41a, and the locking operation portion 49a of the base end portion of the clutch lever 49 is provided. Is always locked to the operation lever 50.

  The operation lever 50 is supported on the lower frame 18 by a pin 52 so as to be rotatable in the horizontal direction, and has an inclined locking portion 50a to which the locking operation portion 49a is locked. doing. As a result, the base end portion of the clutch lever 49 is moved in the vertical direction as the operation lever 50 rotates in the horizontal direction. Although detailed illustration and description are omitted, the operation lever 50 is driven by the drain valve motor in conjunction with opening and closing of the drain valve. A clutch position detection sensor (not shown) for detecting the position of the clutch 15 is provided in the co-rotation preventing portion 41.

  The elevating mechanism 40 configured as described above functions as a clutch switching means together with the drain valve motor, and the drain valve is closed and the operation lever 50 is in the state shown in FIG. 2 in the washing process and the rinsing process. Then, the base end portion of the clutch lever 49 is pushed down, and the contact portion at the tip of the clutch lever 49 pushes the clutch 15 upward against the spring force of the coil spring 45 so as to be positioned at the washing position. Yes. On the other hand, in the dehydration process (and dehydration process), as the drain valve is opened, the operation lever 50 is driven, and as shown in FIG. The contact portion is lowered, and the clutch 15 is lowered to the dewatering position by the spring force of the coil spring 45.

  As shown in FIG. 4, the mechanisms such as the motor 7, the water supply valve 70, and the drain valve 71 are controlled by the control device 60. The control device 60 receives key operation signals from the operation input unit 61 and detection signals from the water level sensor 64, the lid switch, the clutch position detection sensor, and the like. Thus, the control device 60 performs the motor 7, the water supply valve 70, the drain valve 71, etc. according to the control program stored in the ROM or the like based on the key operation of the operation input unit 61 by the user and the various inputs. These mechanisms are controlled to automatically execute washing operations roughly divided into a washing process, a rinsing process (dehydration rinsing process and a rinsing process), and a dehydration process.

  In the washing process and the rinsing process, the stirrer 6 is alternately rotated in the forward / reverse direction at a low speed, and in the dehydration rinsing process and the dewatering process, the rotating tank 5 and the agitator 6 are integrated in one direction (forward direction) at a high speed. It is rotated. At this time, as will be described later in the description of the operation, the control device generates a clutch switching command (rotation drive command for the drain valve motor) in accordance with the washing operation process, and the clutch 15 is set to the washing position and the dewatering position. Switching control between. That is, the clutch 15 is switched to the washing position immediately before the start of the washing process and the rinsing process (timing for closing the drain valve 71), and at the end of the washing process and the rinsing process (timing for opening the drain valve 71). Then, it is switched to the dewatering position.

  Further, at this time, the control device executes a switching auxiliary operation for rotating and stopping the motor 7 for a short time (a few seconds to 10 seconds in total) when the clutch 15 is switched (when the drain valve motor is driven). . This auxiliary switching operation is performed by rotating the motor 7 in the forward direction and the reverse direction with a predetermined energization pattern in small increments. Accordingly, when the clutch 15 is switched to the washing position, the engagement of the engaged portion 42 of the clutch 15 with the engaging portion 48 of the joint rotation preventing portion 41 is urged, and when the clutch 15 is switched to the dewatering position, the lower end of the clutch 15 is promoted. The fitting of the part to the boss part 31 is promoted. This will be described later.

  A control device 60 constituting control means is provided at the lower part of the rear part in the outer box 1. FIG. 4 shows an outline of the electrical configuration centered on the control device 60. The control device 60 is mainly composed of a microcomputer (including a CPU, a ROM, and a RAM) and a nonvolatile memory, and has a function of controlling the overall operation of the washing machine 1.

  In addition to the operation signal of the operation input unit 61 being input to the control device 60 via the display control unit 35, a water level detection signal of a water level sensor 64 that detects the water level of water stored in the water tank 3, a motor 7, a rotation speed detection signal of the rotation sensor 65 that detects a rotation speed of the motor 7, a current detection signal of the current sensor 66 that detects a current flowing through the motor 7, a swing detection signal of the safety lever switch device 67, and a swing detection of the acceleration sensor 68. Signals are input.

  The control device 60 controls the display unit 62 via the display control unit 63 based on these input signals and the control program and data stored in advance in the ROM and read out to the RAM, as well as the water supply valve 70. The drain valve 71, the motor 7 and the like are controlled via a drive circuit 76. The switching assist operation described above is performed by controlling the motor 7 by the control device 60.

  A power source 75 is connected to the control device 60 via a power on switch 72. Between the power-on switch 72 and the control device 60, a voltage detector 73 for detecting the voltage therebetween is disposed. The power supply voltage applied to the motor 7 is detected by the voltage detection unit 73. The voltage value signal of the voltage detected by the voltage detection unit 73 is transmitted to the control device 60. In the control device 60, the detected power supply voltage is compared with the reference voltage, and its level is determined. Further, a power-off switch 74 is connected to the control device 60.

  The detection of the power supply voltage by the voltage detection unit 73 can be performed between the time when the power is turned on by the power-on switch 72 of the washing machine 1 and the time when the clutch is switched. As the power supply voltage value, for example, a power supply voltage detected when the power is turned on may be used, or a power supply voltage 5 seconds after the power is turned on, for example, after a predetermined time has elapsed after the power is turned on may be used. Since it is considered that the power supply voltage is stabilized after a while after the power is turned on, this is preferable.

  Further, as the power supply voltage value, a plurality of power supply voltages may be detected every time a predetermined time elapses after the power is turned on, and an average value of the power supply voltage values may be used. Moreover, it is good also as using the power supply voltage just before switching a clutch at the time of a driving | operation start (immediately after the drain valve 71 after the washing | cleaning process completion | finish) was opened. Alternatively, detection may be performed at the time when energization of the motor 7 for clutch switching is started, or an average value for a predetermined time before clutch switching (for example, an average of 3 seconds by sampling every 100 msec) may be used.

  Hereinafter, the switching assist operation in the present embodiment will be described in detail. In the first embodiment, the energization pattern means the energization timing shown in FIGS. 5B to 5D and FIGS. 7B to 7D.

  FIG. 5 shows an energization pattern (energization timing) to the motor 7 in the switching assist operation (first assist operation) at the time of clutch switching when shifting from the washing stroke to the dewatering stroke in the first embodiment.

  FIG. 5A shows the switching timing of the drain valve 71 from the closed state to the open state when switching from the washing process to the dehydration process. The period during which the drain valve 71 is in the closed state is a washing stroke, and at time T1, the state is switched from the closed state to the open state. After time T1, switching of the clutch 15 is started as a transition operation to the dehydration stroke.

  FIG. 5B shows an energization pattern (energization timing) when the power supply voltage detected by the voltage detection unit 73 is the reference voltage in the auxiliary switching operation of the clutch 15. Here, the energization pattern means the energization timing shown in FIG.

  The reference voltage is, for example, 220 ± 20 [V]. If it exceeds this range, it will be judged as a high voltage, and if it falls below, it will be judged as a low voltage. The energization pattern includes energization units 80 a and 80 b and an energization unit 81 as shown in FIG. Here, the motor forward rotation energization unit 80a and the motor reverse rotation energization unit 80b are set as one set, and this is repeated three times, and the motor forward rotation energization unit 81 is energized three times.

  The time length of the energizing units 80a and 80b is, for example, 0.1 second, and the time length between the energizing units 80a-80b is, for example, 0.7 seconds. The interval between the energization unit 80b and the energization unit 81 is, for example, 2.0 seconds. The time length of the energization unit 81 is 0.1 second, and the time length between the energization units 81 is, for example, 0.5 second.

  During the energization time of the energization units 80a, 80b, and 81, an AC power source configured by a sine wave voltage waveform as shown in FIG. 6 is provided. The AC power source shown in FIG. 6 has, for example, a single-phase two-wire 220V and a frequency of 50 Hz. Energization units 80a and 80b urge the disengagement of the engaged portion 42 of the clutch 15 from the engaging portion 48 of the joint rotation preventing portion 41. Further, the energization unit 81 facilitates the fitting of the lower end portion of the clutch 15 to the boss portion 31.

  FIG. 5C shows an energization pattern (energization timing) when the power supply voltage detected by the voltage detection unit 73 is higher than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is higher than the reference voltage, the number of energizations is reduced by reducing the number of energization units 80a, 80b, and 81 as compared with the case where the power supply voltage is the reference voltage. That is, as shown in FIG. 5 (b), the energization pattern includes a normal motor energization unit 80a and a motor inversion energization unit 80b as one set, and this is repeated for two sets. The unit 81 is energized twice.

  The energization time lengths of the energization units 80a, 80b, 81 are the same as those in FIG. 5A, and the intervals between the energization units 80a, 80b, 81 are the same. In this way, even when the power supply voltage is high, the operation amount of the motor 7 and the operation speed of the motor 7 can be reduced. Thereby, since the operation amount and the operation speed of the motor 7 similar to those in the case where the reference voltage is applied can be suppressed, it is possible to suppress, for example, a mechanical failure by applying a load to the clutch.

  FIG. 5D shows an energization pattern (energization timing) corresponding to the case where the power supply voltage detected by the voltage detector 73 is lower than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is lower than the reference voltage, the number of energizations is increased by increasing the number of energization units 80a, 80b, and 81 as compared with the case where the power supply voltage is the reference voltage. That is, as shown in FIG. 5 (d), the energization timing is set by energizing unit 80a for motor normal rotation and energization unit 80b for motor reversal as one set, and this is repeated for 4 sets. The unit 81 is energized four times.

  The energization time lengths of the energization units 80a, 80b, 81 are the same as those in FIG. 5B, and the intervals between the energization units 80a, 80b, 81 are the same. As a result, the reference voltage is applied even when the operation amount of the motor 7 is small and the operation speed is slow because the power supply voltage is lower than the reference voltage, and the clutch 15 may not be switched normally. It is possible to increase the operation amount and the operation speed of the motor 7 in the same manner as in the above case. Thereby, switching of the clutch 15 is realizable reliably. That is, the energization units 80a and 80b sufficiently urge the disengagement of the engaged portion 42 of the clutch 15 from the engagement portion 48 of the co-rotation prevention portion 41, and the lower end of the clutch 15 is energized by the energization unit 81. The fitting of the part to the boss part 31 is sufficiently promoted.

  FIG. 7 shows an energization pattern (energization timing) to the motor 7 in the switching assist operation (second assist operation) at the time of clutch switching when shifting from the dehydration stroke to the washing stroke in the first embodiment. FIG. 7A shows the switching timing of the drain valve 71 from the open state to the closed state when switching from the dehydration process to the washing (rinsing) process. The period during which the drain valve 71 is in the closed state is a washing (rinsing) process, and the time is switched from the open state to the closed state at time T2, and the switching of the clutch 15 is started as a preparation operation for the dehydration process.

  FIG. 7B shows an energization pattern (energization timing) corresponding to the case where the power supply voltage detected by the voltage detection unit 73 is the reference voltage. Here, the energization pattern means the energization timing shown in FIG. The reference voltage is, for example, 220 ± 20 [V]. As shown in FIG. 7B, the energization pattern includes energization units 82a, 82b, 83a, and 83b.

  Here, the motor forward rotation energization unit 82a and the motor inversion energization unit 82b are set as one set, and this is repeated for three sets. Further, the motor forward rotation energization unit 83a and the motor inversion energization unit 83b are set as one set. This is repeated for two sets and energized. The time length of the energization units 82a and 82b is, for example, 0.1 seconds, and the time length between the energization units 82a and 82b is, for example, 0.7 seconds. The time length between the energization unit 82b and the energization unit 83a is, for example, 0.7 seconds. The duration of the energization units 83a and 83b is 0.5 seconds, and the interval between the energization units 83a and 83b is, for example, 0.7 seconds.

  During the energization time of the energization units 82a, 82b, 83a, and 83b, an AC power source composed of a sine wave as shown in FIG. 6 is applied. The AC power source shown in FIG. 6 has, for example, a single-phase two-wire 220V and a frequency of 50 Hz. Energization units 82 a and 82 b urge the engagement of the engaged portion 42 of the clutch 15 to be disengaged from the engaging portion 48 of the joint rotation preventing portion 41. Further, the energization units 83a and 83b prompt the fitting of the lower end portion of the clutch 15 to the boss portion 31.

  FIG. 7C shows an energization pattern (energization timing) corresponding to the case where the power supply voltage detected by the voltage detection unit 73 is higher than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is higher than the reference voltage, the number of energizations is reduced by reducing the number of energization units 82a, 82b and 83a, 83b as compared with the case where the power supply voltage is the reference voltage. . That is, as shown in FIG. 7C, the energization pattern is such that the motor forward energization unit 82a and the motor inversion energization unit 82b are set as one set, and this is repeated for two sets, and further the motor forward energization is performed. The unit 83a and the motor reversal energization unit 83b are set as one set, and this set is energized for one set.

  The energization time lengths of the energization units 82a, 82b, 83a, 83b are the same as those in FIG. 7B, and the intervals between the energization units 82a, 82b, 83a, 83b are also the same. In this way, even when the power supply voltage is higher than the reference voltage, the operation amount of the motor 7 and the operation speed of the motor 7 can be reduced. Thereby, since it is possible to suppress the operation amount and the operation speed of the motor 7 similar to the case where the reference voltage is applied, it is possible to suppress, for example, inducing a mechanical failure by applying a load to the clutch.

  FIG. 7D shows an energization pattern (energization timing) corresponding to the case where the power supply voltage detected by the voltage detection unit 73 is lower than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is lower than the reference voltage, the number of energizations is increased by increasing the number of energization units 82a, 82b, 83a, and 83b as compared with the case where the power supply voltage is the reference voltage. . That is, as shown in FIG. 7 (d), the energization pattern includes a normal motor energization unit 82a and a motor inversion energization unit 82b as one set, and this is repeated for 4 sets. The unit 83a and the motor reversal energization unit 83b are set as one set, and this is repeated for 3 sets.

  The energization time lengths of the energization units 82a, 82b, 83a, 83b are the same as those in FIG. 7B, and the intervals between the energization units 82a, 82b, 83a, 83b are also the same. As a result, the reference voltage is applied even when the operation amount of the motor 7 is small and the operation speed is slow because the power supply voltage is lower than the reference voltage, and the clutch 15 may not be switched normally. It is possible to increase the operation amount and the operation speed of the motor 7 in the same manner as in the above case. Thereby, switching of the clutch 15 is realizable reliably. That is, the energization units 82a and 82b sufficiently urge the disengagement of the engaged portion 42 of the clutch 15 from the engagement portion 48 of the joint rotation preventing portion 41, and the energization units 83a and 83b allow the clutch 15 to be disengaged. The lower end portion of the boss portion can be sufficiently fitted to the boss portion 31.

  As described above, according to the first embodiment, the energization pattern (energization timing) of the motor 7 for the switching assist operation at the time of clutch switching is changed according to the level of the power supply voltage detected by the voltage detection unit 73. That is, when the power supply voltage is higher than the reference voltage, an energization pattern in which the number of energization units 80, 81, 82, 83 is reduced is used. Thereby, since the output of the motor 7 of the auxiliary switching operation can be suppressed, the operation amount of the motor 7 and the operation speed of the motor 7 can be suppressed even when the voltage is high. Since the amount of operation and the operation speed of the motor 7 can be suppressed to the same as when the reference voltage is applied, for example, a mechanical failure can be suppressed by applying a load to the clutch.

  On the other hand, when the power supply voltage is lower than the reference voltage, an energization pattern in which the number of energization units 80, 81, 82, 83 is increased is used. As a result, it is possible to increase the operation amount and the operation speed of the motor 7 as in the case where the reference voltage is applied, so that the clutch can be switched more reliably.

(Second Embodiment)
Hereinafter, the second embodiment will be described. 1 to 4 and 6 used for the description in the first embodiment are also common in the second embodiment. In the second embodiment, the energization pattern means the energization timing shown in FIGS. 8B to 8D and FIGS. 9B to 9D.

  FIG. 8 shows an energization pattern of a switching auxiliary operation (first auxiliary operation) at the time of clutch switching when shifting from the washing process to the dehydrating process in the second embodiment. Fig.8 (a) has shown the switching timing from the closed state of the drain valve 71 to the open state at the time of switching from a washing process to a dehydration process. The period when the drain valve 71 is in the closed state is a washing stroke, and at time T, the closed state is switched to the opened state, and the switching of the clutch 15 is started as a switching operation to the dehydrating stroke.

  FIG. 8B shows an energization pattern (energization timing) corresponding to the case where the power supply voltage detected by the voltage detection unit 73 is the reference voltage. Here, the energization pattern means the energization timing shown in FIG. The reference voltage is, for example, 220 ± 20 [V]. The energization pattern has energization units 84a and 84b and an energization unit 85 as shown in FIG.

  Here, the motor forward rotation energization unit 84a and the motor reverse rotation energization unit 84b are set as one set, and this is repeated three times, and the motor forward rotation energization unit 85 is energized three times. The time length of the energization units 84a and 84b is, for example, 0.1 seconds, and the time length between the energization units 84a-84b is, for example, 0.7 seconds. The interval between the energization unit 84b and the energization unit 85 is, for example, 2.0 seconds. The time length of the energizing unit 85 is 0.1 second, and the time length between the energizing units 85 is, for example, 0.5 second.

  During the energization time of the energization units 84a, 84b, 85, an AC power source constituted by a sine wave as shown in FIG. Energization units 84a and 84b urge the disengagement of the engaged portion 42 of the clutch 15 from the engaging portion 48 of the joint rotation preventing portion 41. Further, the energization unit 85 prompts the fitting of the lower end portion of the clutch 15 to the boss portion 31.

  FIG. 8C shows an energization pattern (energization timing) corresponding to the case where the power supply voltage detected by the voltage detection unit 73 is higher than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is higher than the reference voltage, the energization time is reduced by shortening the respective time lengths of the energization units 86a and 86b and the energization unit 87 as compared with the case where the power supply voltage is the reference voltage. Is reduced.

  In the energization pattern, as shown in FIG. 8C, the energization time of the energization units 86a and 86b and the energization unit 87 is set to 0.05 seconds. That is, the time is half of the energization units 84a and 84b and the energization unit 85 shown in FIG.

  The energization times of the energization units 86a and 86b and the energization unit 87 are the same as those in FIG. 8B, and the intervals between the energization units 86a and 86b and the energization unit 87 are the same. In this way, even when the power supply voltage is high, the operation amount of the motor 7 and the operation speed of the motor 7 can be reduced. Thereby, since the operation amount and the operation speed of the motor 7 similar to those in the case where the reference voltage is applied can be suppressed, it is possible to suppress, for example, a mechanical failure by applying a load to the clutch.

  FIG. 8D shows an energization pattern (energization timing) when the power supply voltage detected by the voltage detection unit 73 is lower than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is lower than the reference voltage, the energization time is increased by increasing the respective time lengths of the energization units 88a and 88b and the energization unit 89 as compared with the case where the power supply voltage is the reference voltage. Is long (many). As shown in FIG. 8D, the energization pattern is energized with the energization time of the energization units 88a and 88b and the energization unit 89 being 0.2 seconds. That is, the time is half of the energization units 84a, 84b, 85a, 85b shown in FIG.

  The energization times of the energization units 88a and 88b and the energization unit 89 are the same as those in FIG. 8B, and the intervals between the energization units 88a and 88b and the energization unit 89 are the same. As a result, the reference voltage is applied even when the operation amount of the motor 7 is small and the operation speed is slow because the power supply voltage is lower than the reference voltage, and the clutch 15 may not be switched normally. It is possible to increase the operation amount and the operation speed of the motor 7 in the same manner as in the above case. Thereby, switching of the clutch 15 is realizable reliably. That is, the energization units 88a and 88b are long enough to sufficiently promote the disengagement of the engaged portion 42 of the clutch 15 from the engagement portion 48 of the joint rotation preventing portion 41, and the energization unit. By extending the time 89b, the fitting of the lower end portion of the clutch 15 to the boss portion 31 is sufficiently promoted.

  FIG. 9 shows an energization pattern (energization timing) at the time of the auxiliary switching operation (second auxiliary operation) at the time of clutch switching when shifting from the dehydration stroke to the washing stroke in the second embodiment. FIG. 9A shows the switching timing of the drain valve 71 from the open state to the closed state when switching from the dehydration process to the washing (rinsing) process. The period during which the drain valve 71 is in the closed state is a washing (rinsing) process, and the time is switched from the open state to the closed state at time T2, and the switching of the clutch 15 is started as a preparation operation for the dehydration process.

  FIG. 9B shows an energization pattern when the power supply voltage detected by the voltage detector 73 is a reference voltage. Here, the energization pattern means the energization timing shown in FIG. The reference voltage is, for example, 220 ± 20 [V]. As shown in FIG. 9B, the energization pattern includes energization units 90a, 90b, 91a, and 91b. Here, the motor forward rotation energization unit 90a and the motor inversion energization unit 90b are set as one set, and this is repeated for three sets. Further, the motor forward rotation energization unit 92a and the motor inversion energization unit 92b are set as one set. This is repeated for two sets and energized. The time length of the energization units 90a and 90b is, for example, 0.1 seconds, and the time length between the energization units 90a and 90b is, for example, 0.7 seconds. The time length between the energization unit 90b and the energization unit 91a is, for example, 0.7 seconds. The duration of the energization units 91a and 91b is 0.5 seconds, and the interval between the energization units 91a and 91b is, for example, 0.7 seconds.

  During the energization time of the energization units 90a, 90b, 91a, 91b, an AC power source configured by a sine wave as shown in FIG. 6 is applied. Energization units 90a and 90b urge the disengagement of the engaged portion 42 of the clutch 15 from the engaging portion 48 of the joint rotation preventing portion 41. Further, the energization units 91a and 91b prompt the fitting of the lower end portion of the clutch 15 to the boss portion 31.

  FIG. 9C shows an energization pattern (energization timing) when the power supply voltage detected by the voltage detection unit 73 is higher than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is higher than the reference voltage, the energization time is reduced by shortening the time length of each of the energization units 92a, 92b and 93a, 93b as compared with the case where the power supply voltage is the reference voltage. Less. As shown in FIG. 9C, the energization pattern is energized with the energization time of the energization units 92a and 92b being 0.05 seconds. Further, the energization unit 93a, 93b is energized with an energization time of 0.25 seconds. That is, the time is half of the energization units 90a, 90b, 91a, 91b shown in FIG.

  The energization times of the energization units 92a, 92b, 93a, 93b are the same as those in FIG. 9B, and the intervals between the energization units 92a, 92b, 93a, 93b are also the same. In this way, even when the power supply voltage is high, the operation amount of the motor 7 and the operation speed of the motor 7 can be reduced. Thereby, since the operation amount and the operation speed of the motor 7 similar to those in the case where the reference voltage is applied can be suppressed, it is possible to suppress, for example, a mechanical failure by applying a load to the clutch.

  FIG. 9D shows an energization pattern (energization timing) when the power supply voltage detected by the voltage detection unit 73 is lower than the reference voltage. Here, the energization pattern means the energization timing shown in FIG. When the power supply voltage is lower than the reference voltage, by increasing the time length of each of the energization units 94a and 94b and the energization units 95a and 95b as compared with the case where the power supply voltage is the reference voltage. Energizing time is long (many).

  As shown in FIG. 9D, the energization pattern is energized with the energization time of the energization units 94a and 94b being 0.2 seconds. Further, the energization unit 95a, 95b is energized with an energization time of 1.0 second. That is, the time is twice as long as the energization units 90a, 90b, 91a, 91b shown in FIG. The energization times of the energization units 94a and 94b and the energization units 95a and 95b are the same as those in FIG. 9B, and the intervals between the energization units 94a and 94b and the energization units 95a and 95b are also the same.

  As a result, the reference voltage is applied even when the operation amount of the motor 7 is small and the operation speed is slow because the power supply voltage is lower than the reference voltage, and the clutch 15 may not be switched normally. It is possible to increase the operation amount and the operation speed of the motor 7 in the same manner as in the above case. Thereby, switching of the clutch 15 is realizable reliably. That is, the energization units 94a and 94b are long enough to sufficiently promote the disengagement of the engaged portion 42 of the clutch 15 with respect to the engaging portion 48 of the joint rotation preventing portion 41. Since the times 95a and 95b become longer, the fitting of the lower end portion of the clutch 15 to the boss portion 31 is sufficiently promoted.

  As described above, according to the second embodiment, the energization pattern (energization timing) of the motor 7 for the switching assist operation at the time of clutch switching is changed according to the level of the power supply voltage detected by the voltage detection unit 73. That is, when the power supply voltage is higher than the reference voltage, an energization pattern (energization units 86, 87, 92, 93) in which the length of each of the energization units 84, 85, 90, 91 is shortened is used. Thereby, since the output of the motor 7 of the auxiliary switching operation can be suppressed, the operation amount of the motor 7 and the operation speed of the motor 7 can be suppressed even when the voltage is high. Since the amount of operation and the operation speed of the motor 7 can be suppressed to the same as when the reference voltage is applied, for example, a mechanical failure can be suppressed by applying a load to the clutch.

  On the other hand, when the power supply voltage is lower than the reference voltage, an energization pattern (energization units 88, 89, 94, 95) in which the duration of each of the energization units 84, 85, 90, 91 is shortened is used. Thereby, since the operation amount and the operation speed of the motor 7 can be increased as in the case where the reference voltage is applied, the clutch can be switched more reliably.

(Third embodiment)
Hereinafter, a third embodiment will be described. 1 to 4 used in the description of the first embodiment are common to the third embodiment. In the third embodiment, the energization pattern means the voltage waveform of the AC power source shown in FIGS.

  FIG. 10 shows an energization pattern (voltage waveform) applied to the motor 7 in the third embodiment. As the energization timing used in the third embodiment, for example, the energization timing shown in FIGS. 5B to 5D and FIGS. 7B to 7D in the first embodiment is used. In the third embodiment, the phase of the voltage waveform of the AC power supply is controlled, and the energization pattern (voltage waveform) to the motor 7 is continuously controlled by changing the ratio of the ON time for each cycle of the voltage waveform. .

  FIG. 10A shows an energization pattern (voltage waveform) when the power supply voltage detected by the voltage detection unit 73 is a reference voltage. In FIG. 10A, the horizontal axis indicates time, and the vertical axis indicates voltage. Of the time t corresponding to each half (half) wavelength divided for each zero cross point of the sine waveform of the AC power source shown in FIG. ing.

  FIG. 10B shows an energization pattern (voltage waveform) when the power supply voltage detected by the voltage detection unit 73 is higher than the reference voltage. Control is performed so that each of the half-wavelengths divided for each zero cross point of the sine waveform of the AC power source shown in FIG.

  In this way, even when the power supply voltage is high, the operation amount of the motor 7 and the operation speed of the motor 7 can be reduced. Thereby, since the operation amount and the operation speed of the motor 7 similar to those in the case where the reference voltage is applied can be suppressed, it is possible to suppress, for example, a mechanical failure by applying a load to the clutch.

  FIG. 10C shows an energization pattern (voltage waveform) when the power supply voltage detected by the voltage detector 73 is lower than the reference voltage. Control is performed so that each of the half-wavelengths divided for each zero cross point of the sine waveform of the AC power source shown in FIG.

  Thus, even when the power supply voltage is low, the operation amount of the motor 7 and the operation speed of the motor 7 can be increased. Thus, when the power supply voltage is the reference voltage, the operation amount and the operation speed of the motor 7 can be made the same as the energization pattern (voltage waveform) shown in FIG. Can be.

  As described above, in the third embodiment, the energization rate is changed by performing the energization pattern (phase control of the sine wave of the power supply voltage) depending on the level of the power supply voltage, and the operation of the motor 7 according to the power supply voltage is performed. Achieving volume and operating speed.

  When the power supply voltage is the reference voltage or low, the control of 100% energization shown in FIG. 10C is adopted, and the method of reducing the energization rate to 70% by phase control only when the power supply voltage is high is adopted. May be. Further, when the power supply voltage is a reference voltage or high, a 40% energization control shown in FIG. 10B may be used, and a method of increasing the energization rate by phase control only when the power supply voltage is low may be adopted. .

  Moreover, in 3rd Embodiment, an energization pattern is FIG.5 (b)-(d), FIG.7 (b)-(d), FIG.8 (b)-(d), FIG.9 (b)-( You may comprise combining the electricity supply timing shown by d), and the power supply of the voltage waveform shown by Fig.10 (a)-(c).

(Fourth embodiment)
Hereinafter, a fourth embodiment will be described. 1 to 4 used in the description of the first embodiment are common to the fourth embodiment. In the fourth embodiment, for example, any one of the energization timings shown in FIGS. 5B to 5D and FIGS. 7B to 7D in the first embodiment is used. In the fourth embodiment, the energization pattern means the voltage waveform of the AC power supply shown in FIGS.

  FIG. 11 shows voltage waveforms applied to the motor 7 in the fourth embodiment. In the fourth embodiment, alternating current is set to zero (thinning out) energization for an arbitrary ½ wavelength, with each ½ wavelength divided for each zero cross point of the sine waveform of the AC power supply as one unit. The power supply voltage waveform is controlled to control the energization pattern (voltage waveform) to the motor 7.

  FIG. 11A shows an energization pattern (voltage waveform) when the power supply voltage detected by the voltage detection unit 73 is a reference voltage. The energization pattern here means the voltage waveform of FIG. In FIG. 10A, the horizontal axis indicates time, and the vertical axis indicates voltage. The sine waveform of the AC power source shown in FIG. 10A is divided into two wavelengths for each zero cross point, that is, every ½ wavelength, and each of the sine waves for each ½ wavelength is sequentially W1, W2, W3, W4 is assumed (the same applies to FIGS. 11B and 11C). In FIG. 11A, W1, W2, and W4 are controlled to be ON, and W3 is controlled to be OFF. That is, W3 is thinned out.

  FIG. 11B shows an energization pattern (voltage waveform) when the power supply voltage detected by the voltage detection unit 73 is higher than the reference voltage. The energization pattern here means the voltage waveform of FIG. In FIG. 11B, W1 and W4 are controlled to be ON, and W2 and W3 are controlled to be OFF. That is, W2 and W3 are thinned out.

  In this way, even when the power supply voltage is high, the operation amount of the motor 7 and the operation speed of the motor 7 can be reduced. As a result, the operation amount and the operation speed of the motor 7 can be made the same as when the power supply voltage shown in FIG. 11A is the reference voltage. For example, a mechanical failure is caused by applying a load to the clutch. Can be suppressed.

  FIG. 11C shows an energization pattern (voltage waveform) when the power supply voltage detected by the voltage detection unit 73 is lower than the reference voltage. The energization pattern here means the voltage waveform in FIG. In FIG. 11B, W1, W2, W3, and W4 are controlled to be ON.

  In this way, even when the power supply voltage is low, the operation amount of the motor 7 and the operation speed of the motor 7 can be improved. Accordingly, since the operation amount and the operation speed of the motor 7 can be made the same as when the power supply voltage shown in FIG. 11A is the reference voltage, the clutch can be switched more reliably.

  As described above, in the fourth embodiment, the energization ratio to the motor 7 is changed by performing control to thin out any of W1, W2, W3, and W4, and the operation amount of the motor 7 according to the power supply voltage. Realize the operating speed.

(Fifth embodiment)
The fifth embodiment will be described below. The switching assist operation according to the fifth embodiment assumes the following case. That is, the voltage detection unit 73 detects the power supply voltage, and according to this, the above-described first to fourth embodiments are applied to perform the clutch switching switching assist operation. This is the case when the power supply voltage fluctuates immediately before. More specifically, it is as follows.

  The power supply voltage was detected by the voltage detector 73, and the power supply voltage was higher than the reference voltage. Therefore, control was performed with less power applied to the motor 7. That is, the switching assist operation by the energization pattern described in FIGS. 5C and 7C in the first embodiment, and the energization described in FIGS. 8C and 9C in the second embodiment. Switching assist operation by pattern, switching assist operation by the energization pattern described in FIG. 10B in the third embodiment, or switching assist operation by the energization pattern described by FIG. 11B in the fourth embodiment Carried out. However, when the power supply voltage is detected by the voltage detection unit 73 after the auxiliary switching operation, the power supply voltage is the reference voltage or a voltage value equal to or lower than the reference voltage. This means that the voltage has decreased during the auxiliary switching operation or immediately before the auxiliary switching operation.

  In the situation as described above, in response to the fact that the power supply voltage is higher than the reference voltage, the above-described switching assist operation was performed based on the energization timing with less power applied to the motor 7. However, since the power supply voltage was actually low, it is assumed that the operation amount and the operation speed of the motor 7 were insufficient to sufficiently perform clutch switching. That is, the clutch switching may be incomplete.

  Therefore, in the fifth embodiment, an additional switching auxiliary operation (third auxiliary operation) is performed using the energization pattern (energization timing) shown in FIG. In the fifth embodiment, the energization pattern means the energization timing shown in FIG. The energization pattern has energization units 96a and 96b as shown in FIG. The energization unit 96a is energization for normal motor rotation, and the energization unit 96b is energization for motor reversal. In the fifth embodiment, the energization units 96a and 96b are set as one set, and this is performed once. For example, the voltage waveform shown in FIG. 6 is used as the voltage waveform used here. By performing the additional switching assisting operation, even when the power supply voltage detected by the voltage detecting unit 73 changes later, the switching of the clutch can be made more reliable.

  Also, the energization pattern (energization timing) in the fifth embodiment has a simple configuration, unlike the energization pattern described in the first embodiment, for example. Thereby, the overall time of the clutch switching operation can be shortened by shortening the additional switching auxiliary operation time.

  In the fifth embodiment, the energization pattern is set as one set of the energization units 96a and 96b. However, depending on the degree of decrease in the power supply voltage, for example, the energization units 96a and 96b are changed. You may perform control which makes this a plurality of times as one set.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is a washing machine, 5 is a rotating tub (dehydration tub), 6 is a stirring body (pulsator), 7 is a motor (induction motor), 15 is a clutch, 21 is an upper stirring shaft (rotating shaft of the pulsator), 20 Indicates the upper tank shaft (rotation axis of the dewatering tank).

Claims (8)

In a washing machine that uses an induction motor to rotate the pulsator and dewatering tank
A first state in which the driving force from the induction motor is transmitted only to the rotation shaft of the pulsator, and a second state in which the driving force from the induction motor is transmitted to the rotation shaft of the pulsator and the rotation shaft of the dewatering tank. A clutch for switching,
A voltage detection unit for detecting a power supply voltage applied to the dielectric motor,
During the clutch switching operation, an auxiliary operation for switching the clutch is performed by applying a predetermined energization pattern to the induction motor.
The washing machine, wherein the energization pattern is changed according to the level of the power supply voltage detected by the voltage detection unit.   2. The washing machine according to claim 1, wherein the power supply voltage is detected by the voltage detection unit from a time when the washing machine is turned on until the clutch switching operation is started.   The washing machine according to claim 1 or 2, wherein the power supply voltage is detected by the voltage detector immediately before the clutch switching operation is started.   4. The power supply rate applied to the dielectric motor is changed by phase control according to the level of the power supply voltage detected by the voltage detection unit. 5. Washing machine.   4. The time of each energization unit of the energization pattern in the auxiliary operation is changed according to the level of the power supply voltage detected by the voltage detection unit. 5. Washing machine.   The frequency | count of each electricity supply unit of the electricity supply pattern in the said auxiliary | assistant operation | movement is changed according to the level of the said power supply voltage detected by the said voltage detection part, The Claim 1 characterized by the above-mentioned. Washing machine.   As a result of detection of the power supply voltage by the voltage detector, the power supply voltage is higher than a reference voltage value, and is applied to the dielectric motor detected during the clutch switching operation or after the clutch switching operation is completed. The additional auxiliary operation according to a predetermined energization pattern is further performed after the auxiliary operation when a power supply voltage is lower than the reference voltage. The washing machine described.   The washing machine according to claim 7, wherein the energization pattern in the additional auxiliary operation is different from the energization pattern in the auxiliary operation.

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