KR100451076B1 - Electric washing machine - Google Patents

Abstract

Noise generated by repeated contact and disconnection of the rotational force transmission surfaces in the engagement clutch mechanism of the electric washing machine is reduced.

By inserting the buffer member between the rotational force transmission surfaces of the engagement clutch mechanism which transmits the rotation of the motor to the washing tank and the dehydration tank, the contact sound due to the pulsating torque of the motor is reduced.

Description

ELECTRIC WASHING MACHINE {ELECTRIC WASHING MACHINE}

The present invention relates to an electric washing machine.

In the so-called automatic electric washing machine, a washing tank and a dehydration tank are rotatably installed in an outer tank supported by suspension in an outer frame by using a dustproof support device, and a stirring blade is rotatably installed on the bottom of the washing tank and the dewatering tank, It is a structure which drives and rotates the said washing tank, dehydration tank, and stirring blade by the drive apparatus attached to the outer side of a floor.

The driving device transmits the rotation of the motor to the stirring blade via the reduction gear mechanism, rotates the stirring blade in one direction and another direction at low speed, and performs washing and rinsing process. Transfer to the dehydration tank to rotate the washing tank and dehydration tank in one direction at high speed to perform the dehydration process.

Since such an automatic electric washing machine uses an interlocking clutch mechanism, the clutch mechanism in the driving device transmits the interlocking rotational force by the pulsating torque of the motor when the rotational speed of the motor and the rotational speed of the washing tank and the dehydration tank compete with each other. Generates contact noise (noise) caused by repeated contact and separation of faces. This contact sound is particularly loud in a fully automatic electric washing machine in which an induction motor is used as the motor, and the rotational speed is controlled to maintain at a predetermined rotational speed by phase controlling the waveform of the voltage supplied to the induction motor.

It is an object of the present invention to reduce noise caused by repeated contacting and disconnection of rotational force transmission surfaces engaged in a clutch mechanism in a drive device.

According to an aspect of the present invention, an electric washing machine includes a washing tank and a dehydration tank rotatably installed in an outer tank, a stirring blade rotatably installed inside the bottom of the washing tank and the dewatering tank, and an outer side of the bottom of the outer tank. And a drive device for driving the dehydration tank and the stirring vane, and a control device, wherein the drive unit includes a reduction gear mechanism, a clutch mechanism, and a reversible rotation motor in a vertical direction around the driving rotation axis of the washing tank and the dehydration tank and the stirring vane. With a serially aligned configuration, the clutch mechanism has a cushioning member between the rotational force transmission surfaces engaged with each other.

In addition, according to another aspect of the present invention, the reversible rotating motor is an inverter motor.

According to another aspect of the present invention, the clutch mechanism transmits a rotational force through a contact surface by an engagement engagement between an engagement recess and a recess provided in the rotor of the motor and a slider protrusion slidably coupled to the input shaft.

According to another aspect of the present invention, the shock absorbing member is provided so as to be interposed between the contact surfaces on both sides in the rotational direction of the engagement recessed portion.

According to another aspect of the present invention, the engaging convex portion is formed of an engaging convex plate provided on the rotor of the motor, and the engaging projection of the slider is made of resin for slidably sliding the slider engaged with the shaft.

According to another aspect of the invention, the interlocking convex plate is made of a nonmagnetic metal or resin.

According to another aspect of the present invention, the control device controls the rotational speed at a predetermined rotational speed in the dehydration process by intermittently supplying electric power to the motor.

1 is a schematic vertical side cross-sectional view showing the basic configuration of one embodiment of a fully automatic electric washing machine according to the present invention;

2 is a vertical side cross-sectional view showing a specific configuration of the fully automatic electric washing machine shown in FIG.

3 is a vertical side cross-sectional view showing the internal configuration of a drive device in the fully automatic electric washing machine shown in FIG.

Fig. 4A is a plan view showing the rotor core of the induction motor in the drive device shown in Fig. 3;

4B is a vertical side cross-sectional view showing a portion of the rotor core.

Fig. 5A is a plan view of the engagement recessed and uneven plate of the engagement clutch mechanism in the drive device shown in Fig. 3;

Fig. 5B is a sectional view of the interlocking convex plate taken on the plane of line A-A.

Fig. 6A is a plan view of the rotor of the induction motor in the drive device shown in Fig. 3;

Fig. 6B is a sectional view of the rotor taken on the plane of line B-B.

FIG. 7 is a side view showing one embodiment of a buffer rod inserted in the rotor shown in FIG. 3; FIG.

Fig. 8 is a vertical side cross-sectional view showing an operating state of the engagement clutch mechanism in the drive device shown in Fig. 3, showing the engagement clutch mechanism in the stirring vane driving state.

FIG. 9 is a vertical side cross-sectional view showing an operating state of the engagement clutch mechanism in the drive device shown in FIG. 3, showing that the engagement clutch mechanism is in a washing tank and a dehydration tank driving state. FIG.

Fig. 10A is a plan view showing a slider in the engagement clutch mechanism of the drive device shown in Fig. 3;

Fig. 10B is a vertical side cross-sectional view showing a slider in the engagement clutch mechanism of the drive device shown in Fig. 3;

Fig. 10C is a bottom view showing the slider in the engagement clutch mechanism of the drive device shown in Fig. 3;

FIG. 11 is a block diagram showing an embodiment of an electrical configuration of the fully automatic electric washing machine shown in FIG.

FIG. 12 is a flowchart showing a control process executed by a microcomputer in the fully automatic electric washing machine shown in FIG.

Fig. 13 is a chart of rotational speed characteristics of a motor in the dehydration step.

Fig. 14 is a chart showing a phase control waveform of the voltage of the supplied electric power at the initial stage of the power supply on (0N) period in the constant speed control of the dehydration process.

Fig. 15 is a table for phase control of the voltage of the supplied electric power at the initial stage of the electric power supply on period in the constant speed control of the dehydration process.

Fig. 16 is a chart showing a phase control waveform of the voltage of the supplied electric power at the initial stage of the electric power supply on period in the constant speed control of the dehydration process.

Fig. 17 is a chart showing phase control waveforms of the voltage of the supplied electric power at the initial stage of the power supply OFF period in the constant speed control of the dehydration process.

Fig. 18 is a table for phase control of the voltage of the supplied electric power at the initial stage of the power supply off period in the constant speed control of the dehydration process.

Fig. 19 is a block diagram showing a modification of a capacitor reversing phase type reversible rotary induction motor and drive circuit in the drive device of the fully automatic electric washing machine shown in Fig. 1;

20 is a speed control characteristic chart of a dehydration process by the drive unit shown in FIG. 19;

21 is an operation control characteristic chart in a dehydration process of the fully automatic electric washing machine shown in FIG.

FIG. 22 is a graph showing the relationship between the load amount in the dehydration process shown in FIG. 21 and the deceleration time during braking;

FIG. 23 is a braking control table based on the braking characteristics shown in FIG.

24 is a chart showing operation control characteristics in the dehydration process of the fully automatic electric washing machine shown in FIG. 1;

FIG. 25 is a graph showing the relationship between the load amount in the dehydration process shown in FIG. 24 and the deceleration time at the time of braking; FIG.

FIG. 26 is a table for braking control based on the braking characteristics shown in FIG. 25; FIG.

<Explanation of symbols for the main parts of the drawings>

2: washing and dehydrating tank

4: stirring blade

5: outer bird

6: driving device

17 control unit

45: rotor

45c: interlocking convex plate

45c2: engagement protrusion

45f: cushioning rod

45f1, 45f3: large diameter part

45f2, 45f4: small diameter part

47: engagement clutch mechanism

47c: slider

47f: interlocking projection

1 is a schematic vertical side cross-sectional view showing the basic configuration of one embodiment of a fully automatic electric washing machine according to the present invention;

Reference numeral 1 is a frame incorporating an internal mechanism. Reference numeral 2 denotes a washing tank and a dehydration tank, and includes a fluid balancer 3 in the upper edge, and the stirring vane 4 is rotatably provided in the bottom portion of the washing tank and the dehydration tank. Reference numeral 5 denotes an outer tub for rotatably embedding the washing tub and the dehydrating tank 2 attached to the outside of the bottom part by using the attachment base 7 made of steel plate, and the outer tub is an outer frame 1. Suspended and supported by the dustproof support device from the four corners of the upper end of the). The internal configuration of the drive device 6 will be described later.

The top cover 9 with the garment input opening 9a is fitted in the open end edge of the outer frame 1 so as to cover the top opening of the frame 1 and the front panel 10 and the rear panel 11 are ( It is attached to the outer frame 1 using attachment screws (not shown).

The front panel box 12 formed between the top cover 9 and the front panel 10 corresponds to the water level in the power switch 13, the input switch group 14, the display element group 15, and the outer tub 5. A level sensor 16 for generating a level signal, and a control unit 17. These parts constitute a control device.

The rear panel box 18 formed between the upper cover 9 and the rear panel 11 has a water supply solenoid valve having a water inlet side connected to the faucet 19 and a water outlet side connected to the water supply port 20. (21). The water supply port 20 is formed to drain toward the opening of the washing tank and the dehydration tank 2.

The clothes input opening 9a formed in the upper surface cover 9 is covered with a lid 22 so as to be openable.

A drain 5a formed at the bottom of the outer tub 5 is connected to the drain hose 24 via a drain solenoid valve 23, and an air trap 5b is connected to the water level sensor via an air tube 25. 16).

A base 27 having legs 26 at four corners is attached to the lower end edge of the frame 1, and the base is made of synthetic resin.

Fig. 2 is a vertical sectional side view showing a specific configuration of this automatic electric washing machine, and an enlarged part of the automatic electric washing machine is shown. Since the fully automatic electric washing machine basically has the same configuration as the fully automatic electric washing machine shown in Fig. 1, the parts corresponding to the parts of the fully automatic electric washing machine shown in Fig. 1 are identified by the same reference numerals and the description thereof will be omitted.

3 is a vertical side cross-sectional view showing an internal configuration of the drive device 6.

This drive device 6 has a configuration in which the reduction gear mechanism, the engagement clutch mechanism and the reversible rotational induction motor are aligned in series in a direction perpendicular to the center of the drive rotation shaft of the washing tank and the dehydration tank 2 and the stirring vane 4. .

The reduction gear mechanism supports the drive rotary shaft system 34 having a double structure inside and outside in the reduction gear outer cases 32a and 32b which can be divided into two by the ball bearings 33a and 33b. The reduction gear outer cases 32a and 32b are attached to the attachment base 7 using the attachment screws 31 against the engagement flanges of the case.

The drive shaft system 34 has a hollow outer shaft system and an inner shaft system disposed in the hollow space of the hollow outer shaft system.

The outer rotary shaft system is a rotary shaft system for transmitting the rotation of the motor directly to the washing tub and the dehydrating tank 2 to drive the washing tub and the dehydrating tank 2, and extends to the outside of the outer case 32a and penetrates the outer tub 5. The outer output shaft portion 35a for connecting the upper end portion to the washing tub and the dehydration tank 2, and the serration 35b for engaging the engagement clutch mechanism in the cylinder portion extending outward of the outer case 32b and the inner end portion. An outer input shaft portion 35d having a flange 35c, and a gear case portion 35e for receiving the planetary gear reduction mechanism, wherein the gear case portion 35e includes an outer output shaft portion 35a and an outer input shaft portion ( 35d). The annular gear 35f constituting a part of the planetary gear reduction mechanism is fixed on the inner circumference of the gear case portion 35e.

The inner rotary shaft system installed inside the outer rotary shaft system is a rotary shaft system which reduces the rotation of the motor and transmits it to the stirring blade 4 to drive the stirring blade 4, and the inner rotary shaft system includes the seal 37 and the metal bearing 38a. , 38b) and a grip stop ring (pushing nut; 39), which are installed in the outer output shaft portion 35a in a watertight state and a shedding prevention state, and are provided in the washing tank and the dehydrating tank 2 from the upper portion of the outer output shaft portion 35a. It has an attachment screw 36a in the outer end which protrudes and is attached to the stirring blade 4, and has a serration 36b in the inner end which protrudes from the inner end into the gear case part 35e and engages with a planetary gear reduction mechanism. Motor rotation in the outer end portion 36c and the outer end portion which is held by the ball bearings 40a and 40b in the outer input shaft portion 35d and extends in the cantilever state from the outer end of the outer input shaft portion 35d. Inner input shaft portion 36g having self-fitting portion 36d and fixing screw 36e and having sun gear 36f at the inner end portion extending in gear case portion 35e, and in gear case 35e. A planetary gear 36i supported by a bearing by a carrier 36h fitted to the serration 36b of the inner output shaft portion 36c and engaged with the gears 35f and 36f to transmit a reduced rotational force to the carrier 36h. do.

The ball bearings 40a and 40b are attached in the outer ring press-fit state in the outer input shaft portion 35d to support the inner input shaft portion 36g, which is the shaft of the motor rotor, with high accuracy. Since the inner input shaft portion 36g supports the rotor of the induction motor in a cantilevered state, representative ball bearings 40a and 40b of rolling bearings suitable for supporting a small loss and a large load in the radial direction are the inner input shaft portion ( It is used as a bearing supporting 36g). However, roller bearings may be used instead of ball bearings.

In this kind of drive rotary shaft system 34, the component parts of the outer rotary shaft system are formed by cold pressing a steel plate electroplated with zinc. First, the inner output shaft portion 36c is fitted into the outer output shaft portion 35a and supported by the metal bearings 38a and 38b to temporarily hold the grip stop ring 39 in a watertight state using the seal 37. The pressurized output shaft part is formed. Then, the assembly is temporarily performed by fitting the gear case portion 35e on the inner end of the outer output shaft portion 35a.

The work piece assembled by fitting the gear case portion 35e on the inner end of the outer output shaft portion 35a is supported to be surrounded by a die provided in the press working machine, and the outer output shaft portion 35a and the gear case portion 35e are supported. The fitting portion therebetween is metal-flow coupled by pressing and simultaneously pressing the grip stop ring 39 to press and widen the end of the outer output shaft portion 35a using the punch 104.

On the other hand, the input shaft part is comprised by providing the inner input shaft part 36g in the outer input shaft part 35d by the ball bearing 40a, 40b.

Next, the fitting portion between the outer output shaft portion 35a and the gear case portion 35e is protruded into the gear case 35e of the partially assembled work piece formed by supporting the metal flow-coupling portion and being surrounded by a die provided in the press machine. The carrier 36h is fitted over the serration 36b, the planetary gear 36i is supported on the carrier 36h, the ring gear 35f is inserted, and the input is made to fit on the workpiece with the ring gear inserted therein. Cover the opening edge of the gear case part 35e with the flange 35c with the shaft part upside down, and divide the opening edge of the gear case part 35e and retain the outer periphery edge. The input shaft portion is engaged with the gear case portion 35e by pressing a punch having a ring cutting edge for folding the edge onto the workpiece to which the input shaft portion is fitted.

The motor attaches the screw 42 through the insulating member 41 in an insulated state, attaches the motor housing 43 to the lower end face of the outer case 32b, opens downward, and stator 44 through the opening end. And insert the stator between the plurality of cut-and-raised projections 43a and the bending hook 43b to secure the stator. In detail, the motor winds and sets the stator winding part 44b of the six-pole configuration to the stator core 44a so as to form a condenser split phase type reversible rotating induction motor, and the outer peripheral surface of the stator core 44a is set to the motor. The stator core 44a is inserted into the motor housing 43 so as to be fixed to the housing 43, and then the motor housing 43 is attached to the lower end face of the outer case 32b. The rotor 45 having the stator 44 is fitted to the rotor fitting portion 36d formed on the inner input shaft portion 36g and using a fixing nut 46 screwed to the fixing screw 36e. It is fixed.

In the rotor 45, first, as shown in Figs. 4A and 4B, an outer core 45a1 and an inner core 45a2 for the rotor core 45a are laminated. The outer core 45a1 and the inner core 45a2 have a dimension in which a gap 45a3 for forming an insulating resin layer occurs between them. The outer core 45a1 has a slot 45a4 for forming a cage-shaped second conductor at the outer periphery of the outer core 45a1 through die casting, and is stacked obliquely to suppress torque fluctuations. The inner core 45a2 has a rotating shaft fitting hole 45a5 for inserting a rotor fitting portion formed at an end of the inner input shaft portion 36g at the center thereof, and an engaging yaw around the rotating shaft fitting hole 45a5 (to be described later). Four uneven plate fitting holes for fitting the steel plate, and a buffer rod fitting hole for inserting and fixing a buffer rod (to be described later) for buffering contact on both sides of each uneven plate fitting hole 45a6. 45a7) and laminated in a straight state.

The rotational shaft fitting hole 45a5 of the inner core 45a2 has a circular shape, and about 80% of the stack thickness is formed in a circular shape to ensure the accuracy of the inner core 45a2 and prevent rotation. In addition, the inner circumferential surface of the outer core 45a1 and the outer circumferential surface of the inner core 45a2 prevent rotation when the insulating resin layer is inserted into the gap 45a3 by the combination of the uneven surface. In addition, the lamination thickness of the outer core 45a1 and the lamination thickness of the inner core 45a2 are reduced in dimensional difference by making the number of laminations the same.

As shown in Figs. 5A and 5B, four cutout recesses are formed by forming four cutout recesses 45c1 equally spaced at the periphery of a circular nonmagnetic metal plate (in this embodiment, using a brass plate). Four engagement projections 45c2 radially remaining between the 45c1, and a buffer for fitting the buffer rods in the contact surfaces 45c3 on both sides of the engagement projections 45c2 so that the buffer bars protrude from the contact surface 45c3. By forming the rod fitting cutout hole 45c4 and forming the fitting protrusion 45c5 for fitting and attaching to the uneven plate fitting hole 45a6 of the inner core 45a2 of the lower surface by extrusion processing, The engaging concave-convex plate 45c is formed. In this regard, the diameter of the buffer rod fitting cutout hole 45c4 is formed larger than the diameter of the buffer rod fitting hole 45a7. The engagement recessed plate 45c may be formed by molding a nonmagnetic resin in a similar shape.

In the engaging core plate 45c engaged with the rotor core 45a produced as described above, as shown in Figs. 6A and 6B, first, the cage-like second conductor 45b1 with respect to the outer core 45a1. And cooling fans 45b2 and 45b3 are molded into one unit by aluminum die cast 45b.

With respect to the inner core 45a2, the fitting protrusion 45c5 of the engaging recess plate 45c fits and fixes the engaging recess plate 45c on the upper surface of the inner core 45a2. 45a6). In the state in which the engagement recessed plate 45c is engaged with and fixed on the upper surface of the inner core 45a2, the buffer rod formed in the engagement bar 45a7 and the engagement recessed plate 45c formed in the gap 45a3. The fitting cut holes 45c4 communicate with each other in a concentric state.

Then, the insulating resin layer 45d1 joining the outer core 45a1 and the inner core 45a2 is injected by injecting insulating resin PPS into the gap 45a3 between the outer core 45a1 and the inner core 45a2. The rotation magnet accommodating part 45d2 for rotation detection sensors is formed by extending the insulated resin layer 45d1 so that the permanent magnet 45e may fit in the rotating magnet accommodating part 45d2. Further, the rotating magnet accommodating portion 45d2 is formed to extend to the upper end surface of the rotor core 45a so as to surround the outer periphery of the four engaging protrusions 45c2 of the engaging convex-concave plate fitted to the end surface. In this regard, the resin molding is performed so that the buffer rod fitting cutout hole 45c4 formed in the engagement bar 45a7 and the engagement bar uneven plate 45c formed in the gap 45a3 remains empty.

Buffer rod fitting hole 45a7 formed in gap 45a3 is engaged with buffer rod fitting cut hole 45c4 formed in engagement plate 45c. The buffer rod 45f to be inserted and fixed has an appropriate elasticity and excellent heat resistance. And molded urethane rubber having abrasion resistance (hardness HS90 ± 5 as a thermoplastic urethane elastomer). As shown in Fig. 7, the buffer rod 45f has a large diameter portion 45f1 fixed on the upper surface of the inner core 45a, and a small diameter portion penetrating through the buffer rod fitting hole 45a7. 45f2), large diameter part 45f3 fixed on the bottom surface, and fitting operation part 45f4. The large diameter portion 45f1 has a diameter through which the large diameter portion 45f1 can be fitted into the buffer rod fitting cutout hole 45c4 and is fixed to the edge of the buffer rod fitting hole 45a7. The large diameter portion 45f3 has a diameter through which the large diameter portion 45f3 can pass through the buffer rod fitting cutout hole 45c4, and is pressurized to deform into a smaller diameter so as to pass through the buffer rod fitting hole 45a7. And it is inflated and restored after passing through the buffer rod fitting hole 45a7 to form a tapered portion that can be secured to the edge of the buffer rod fitting hole 45a7. The fitting operation part 45f4 has a hole through which the fitting operation part 45f4 can pass easily through the buffer rod fitting hole 45a7, and passes the buffer rod 45f through the buffer rod fitting hole 45a7. And a length that can be used for the pulling operation to secure and secure it.

The fitting operating portion 45f4 of the shock absorbing rod 45f passes from the shock absorbing rod fitting cutout hole 45c4 of the engaging recessed plate 45c through the shock absorbing rod fitting hole 45a7 of the inner core 45a2, and on the opposite side. The exposed portion is pulled so that the large diameter portion 45f3 is pressed and passed through the buffer rod fitting hole 45a7. In the final stage of this process, the large diameter portion 45f1 is fitted into the cushioning rod fitting cutout hole 45c4 and fixed to the upper edge of the buffering rod fitting hole 45a7 of the inner core 45a2. By further pulling the fitting operating portion 45f4, the small diameter portion 45f2 is expanded, and the large diameter portion 45f3 passes through the buffer rod fitting hole 45a7 and the lower edge of the buffer rod fitting hole 45a7. To be fixed in place. In this state, by cutting the fitting operating portion 45f4, the shock absorbing rod 45f is fixed in a state where a part of the large diameter portion 45f1 protrudes from the contact surface 45c3 of the engaging projection 45c2, and the contact surface 45c3. Buffers contact against

The rotor 45 as described above is fitted into the motor rotor fitting portion 36d formed on the inner input shaft portion 36g, and is fastened to the motor rotor fitting portion 36d by tightening the fixing nut 46. Sticks.

As shown in part in FIGS. 8 to 10, the engagement clutch mechanism 47 connects the outer rotary shaft system 35 to the rotor 45 of the motor and engages the rotor with the outer rotary shaft system 35 by engaging engagement. The rotational force of 45 is transmitted to rotate the outer axis system 35, or disengage the engagement to stop rotation of the outer axis system 35.

In order to reduce the overall size of the drive device 6 in the axial direction, the engagement clutch mechanism 47 includes a ring-shaped solenoid coil 47a inside the motor housing 43 using the attachment screw 42. It is attached with the ring-shaped solenoid core 47b, and is arrange | positioned in the inner space enclosed by the end coil of the stator winding part 44b so that the outer input shaft part 35d may be enclosed. A slider 47c made of an insulating resin slidably coupled to the serration 35b formed on the outer input shaft portion 35d in an axial direction is coupled to the coil spring (c) to engage with the engagement recessed plate 45c of the rotor 45. 47d) is pushed downward and lifted by the electromagnetic force of the solenoid coil 47a in opposition to the pushing force of the coil spring 47d, thereby releasing and attaching and fixing to the solenoid core 47b to rotate. Stop.

The slider 47c includes an iron adsorption element 47e integrated with the slider in one unit through external insertion molding using PPS resin, and the iron adsorption element 47e is attached to the solenoid core 47b. . The slider 47c is provided with a clearance in the cutting recess 45c1 of the engaging concave-convex plate 45c so as to have a small gap in the rotational direction, and the engaging projection 47f integrated with the slider in one unit using molding resin. The engagement projection 47f compresses the large diameter portion 45f1 during the rotational torque transmission, whereby the large diameter portion of the shock absorbing rod 45f protrudes from the contact surfaces 45c3 on both sides of the engagement projection 45c2. 45f1) and the contact surface 45c3. In addition, a serration (47g) slidably coupled to the serration (35b) formed in the outer input shaft portion (35d) is formed therein.

A plurality of radial stop grooves 47b1 are formed on the suction surface of the solenoid core 47b, and a plurality of radial protruding strips 47e1 to be engaged with the plurality of radial stop grooves 47b1 are formed of the slider 47c. The adsorption element 47e is formed on the adsorption element 47e to prevent the slider 47c from turning when the adsorption element 47e is adsorbed to the solenoid core 47b.

Since the shock absorbing rod 45f is a shock absorbing member which cushions the contact between the engaging convex-concave plate 45c of the rotor 45 of the motor and the engaging projection 45c2 of the slider 47c in the engaging clutch mechanism, the shock absorbing rod 45f ) May be modified in various forms and installed on the slider 47c side.

The bottom end of the motor housing 43 is covered by fitting the cover 48. The rotation detection element 49 (magnetic sensing element) of the rotation detection sensor is attached to the cover, and the rotation detection element 49 is disposed opposite the rotation path of the permanent magnet 45d of the rotor 45.

The drive device 6 described above is attached by attaching an attachment base on the outer bottom of the outer tub 5 with the attachment screw 50. The outside of the drive device 6 is covered with an outer cover 51 attached with the drive device 6 by an attachment screw 50.

11 is a block diagram showing an embodiment of an electrical configuration of a fully automatic washing machine.

The control unit 17 is configured around the microcomputer 17a and includes a power supply circuit 17b, a zero-crossing signal generation circuit 17c, a reset circuit 17d, a power supply relay 17e, a water supply A diode and a semiconductor alternating switching element (FLS) group for controlling the power supply to the solenoid coil 47a and the stator windings 44b (44b1, 44b2) of the engagement clutch mechanism with the solenoid valve 21 and the drain solenoid valve 23. Drive circuit 17f constituted by a group, oscillation circuit 17g for generating a clock signal, and buzzer 17h.

The power supply circuit 17b generates a low voltage direct current voltage for the control circuit, the zero-cross signal generation circuit 17c generates a reference signal for controlling the semiconductor switching element, and the reset circuit 17d generates a predetermined initial state when the power supply is switched on. A reset signal for resetting the microcomputer 17a in a state is generated, and the oscillation circuit 17g generates a clock signal for operating the microcomputer 17a.

In controlling the power supply to the stator windings 44b1 and 44b2 of the motor, the drive circuit 17f includes two semiconductor alternating current switching elements FLS 17f1 and 17f2 for reversible rotation control and for reverse electromagnetic braking. do. FLS 17f1 is a semiconductor alternating current switching element for forward rotation power supply control, and FLS 17f2 is a semiconductor alternating current switching element for reverse rotation power supply control. Reference numeral 44c denotes a divided phase condenser. Also provided are valve control FLSs 17f3 and 17f4 for controlling the water supply solenoid valve 21 and the drain solenoid valve 23. Regarding the control of the power supply to the solenoid coil 47a, a diode bridge 17f5 for conducting a direct current drive current suitable for generating a large electromagnetic force and a FLS 17f6 for phase control for controlling the drive current are provided. . The solenoid coil drive current is controlled so that the drive current becomes large in the initial stage of attracting the adsorption element 47e due to the need for a large electromagnetic force and then decreases after being adsorbed to reduce heat generation.

The microcomputer 17a obtains an input signal from the power switch 13, the input switch group 14, the water level sensor 16, and the rotation detection element 49 in accordance with a preset control processing program, thereby displaying the display element group 15 ), The power supply relay 17e, the drive circuit 17f, and the buzzer 17h.

When the power switch 13 is turned on, the power relay 17e is turned on so that the microcomputer 17a of the control unit 17 is in the standby state.

Then, when the start of washing is instructed from the input switch group 14, the washing and dehydration mode set by the input switch group 14 is checked and the washing and dehydration process of the set washing and dehydration mode is started.

Fig. 12 shows a control process executed by the microcomputer 17a in the basic washing and dehydration mode.

<Step 101>

The water supply solenoid valve 21 is opened to supply water to the outer tank 5 to a predetermined level. This preset water level is a water level suitable for clothing amount detection in the next step, and the water level detection is performed by monitoring the water level detection signal output from the water level sensor 16.

<Step 102>

Detection of the amount of clothing is performed. Clothing amount detection is performed based on the strength of the resistance of the article to be washed when the stirring vanes 4 are rotated, which is similar to that in a conventional washing machine. To do this, by exciting the solenoid coil 47a of the engagement clutch mechanism 47 to electromagnetically attract the adsorption element 47e, the slider 47c is moved from the engagement recessed portion 45c3 of the rotor 45 of the motor. Pulled up against the coil spring 47d to separate the engaging projection 47f of the slider 47c and adsorbed to the solenoid core 47b to engage the engaging projection strip 47e1 with the stop groove 47b1. By adsorbing the element 47e, the rotation of the outer rotary shaft system 35 (the washing tank and the dehydration tank 2) is suppressed and stopped. Under this condition, the stator coil 44b of the motor is excited to rotate the rotor 45, and the rotational speed is increased from the inner input shaft portion 36g via the planetary gear 36i to rotate the stirring blade 4. After deceleration, rotation is transmitted to the inner output shaft portion 36c. Next, the inertial rotational speed at the time of stopping the drive is detected based on the output signal from the rotation detection element 49, and the amount of clothes is detected based on the deceleration characteristic thereof. Clothing quality can be detected by performing a detection process while the water level is changing.

<Step 103>

The washing level is determined in correspondence with the amount of clothing and the quality of the garment, and water supply is performed up to the washing level.

<Step 104>

A washing process corresponding to the quantity of clothes and the quality of the clothes is performed. The washing process includes a washing method of rotating the stirring blades 4 in one direction and then another direction, a washing method of rotating the washing tank and dehydration tank 2 in one direction and then another direction, and a washing and dehydrating tank 2 ) May be performed by selecting one mode among the washing methods of continuously rotating in one direction.

The washing method of rotating the stirring vanes 4 in one direction and then in another direction is suitable for vigorously stirring to wash laundry such as, for example, cotton underwear or socks. The washing method of rotating the washing and dehydrating tank 2 in one direction and then in another direction, for example, by stirring to wash large laundry, such as sheets or bath towels, to prevent the laundry from being entangled with each other and to reduce laundry unevenness. Suitable for The washing method of continuously rotating the washing tank and the dehydrating tank 2 in one direction is suitable for washing laundry such as clothing having a dry washing mark, for example, to maintain its shape.

The washing method of rotating the stirring blade 4 in one direction and then in the other direction includes the slider 47c and the rotor by exciting the solenoid coil 47a of the engagement clutch mechanism 47 to pull up the slider 47c. The engagement between the engaging convex and convex plates 45c of 45 is released, and the stop protruding strip 47e1 is engaged with the stop groove 47b1 to prevent rotation of the outer input shaft to prevent the washing and dehydrating tank 2 from being stopped. The adsorption element 47e is attracted to the solenoid core 47b so that the stator coil 44 is excited so that the rotor 45 rotates in one direction and then in the other direction, and the inner input shaft portion 36g By transmitting rotation to the stirring blade 4 via the planetary gear 36i and the inner output shaft portion 36c.

In the washing method in which the washing tank and the dehydrating tank 2 are rotated in one direction and then in the other direction, the engaging protrusion 47f of the slider 47c is rotated by pushing the slider 47c down by the coil spring 47d. Excitation of the solenoid coil 47a of the engagement clutch mechanism 47 so as to engage with the cutout recess 45c1 of the engagement concave-convex plate 45c of the electron 45 and engage the slider 47c with the rotor 45. And the stator coil 44 is excited so that the rotor 45 rotates in one direction and then in the other direction, and the outer input shaft portion 35d, the gear case portion 35e, and the outer output shaft portion 35a. By transmitting the rotation to the washing and dehydrating tank (2) through. At this time, since the planetary gear mechanism loses the deceleration function, the stirring vanes 4 rotate together with the washing tank and the dehydration tank 2 together.

In the washing method of continuously rotating the washing tank and the dehydrating tank 2 in one direction, the stator coil is set so that the water level is set to a low value, and the rotor 45 is rotated in one direction under the engagement and connection of the engagement clutch mechanism 47. It is performed by exciting 44.

The microcomputer 17a determines the garment amount and the garment quality corresponding to the washing mode set by the input switch group 14, and controls the solenoid coil 47a of the engagement clutch mechanism 47 to engage the engagement clutch mechanism 47. By controlling the connection and disconnection status of the three kinds of washing methods are performed. In addition, a washing method combining these methods may be carried out if necessary.

<Step 105>

Rinsing process is performed. It is preferable to perform the rinse process by combining a shower-dewater rinse and a pool rinse. A preferred combination method is that a shower-dehydration rinse is initially performed followed by a full rinse.

The shower-dewatering rinse opens the drain solenoid valve 23 so that it is drained, and supplies water into the wash and dehydration tank 2 under dehydration, which rotates the stirring vane 4 and the washing and dehydrating tank 2 at high speed. By opening the feed water solenoid valve 21.

In dewatering to rotate the washing tub and dewatering tank 2 at high speed, the engagement clutch mechanism 47 is excited of the solenoid coil 47a, similarly to the washing method of rotating the washing tub and dewatering tank 2 described above. The slider 47d is in a state where the slider 47d is engaged with the rotor 45 of the motor, and the motor is rotated in a predetermined direction at a high speed.

The full rinse repeats the operation of opening the drain solenoid valve 23 so as to drain the inside of the outer tank 5 under the stop state of the stirring blade 4 and the washing tank and the dehydrating tank 2, and the washing tank and the dehydrating tank 2 at high speed. ) By rotating the drain solenoid valve 23, opening the water supply solenoid valve 21, opening the water supply solenoid valve 21 to collect rinsing water in the washing tank and the dewatering tank 2, and stirring blades to stir the laundry. (4) or by rotating the washing and dehydrating tank (2).

<Step 106>

Dewatering process is performed. This dewatering process is carried out in a similar manner to the dehydration in the rinsing process.

In each step, the microcomputer 17a controls the display element group 15 to display the setting state and the process processing state, and if an abnormality occurs, the buzzer 17h sounds.

In the dewatering and dewatering step in the rinsing step, the engagement clutch mechanism 47 which makes the slider 47d and the rotor 45 of the motor connected to rotate the washing tank and the dewatering tank 2 is a slider 47d. Cushioning projection 47f is fitted to the cutout recess 45c1 of the engaging concave-convex plate 45c of the rotor 45 of the motor, and the shock absorbing rod (protruding from the contact surfaces 45c3 on both sides of the engaging projection 45c2). The large diameter portion 45f1 of 45f) and the contact surface 45c3 by compression of the large diameter portion 45f1 are brought into contact with each other. In the rotational state in which the motor is operated in the above-mentioned engagement state and the rotational torque is transmitted to the washing tub and the dehydrating tank 2, the rotational speed reaches a predetermined rotational speed and competes with the rotational speed of the washing tub and the dehydrating tank 2. When it comes to a state, the transmission of the rotational torque by the engagement becomes weak or interrupted by the pulsating torque of the motor. However, in this embodiment, since the large diameter portion 45f1 of the shock absorbing rod 45f protrudes from the contact surface 45c3 of the engaging convex plate 45c provided in the rotor 45 of the motor, The strong pulsation or the intermittent pulsation is absorbed by the elastic deformation of the large diameter portion 45f1, and the contact and separation between the contact surface 45c3 of the engagement recessed plate 45c and the engagement protrusion 47f of the slider 47d are alleviated. Suppress the generation of contact sound.

Moreover, this suppression function of contact sound generation is effective for intermittent dehydration in which the motor is operated intermittently.

Moreover, the suppression function of contact sound generation by this engagement clutch mechanism 47 is similarly exhibited when the engagement clutch mechanism 47 is applied to an electric washing machine using an inverter motor as a motor.

The suppression of contact sound generation in the dehydration process can be more effectively realized by improving the motor control in the constant speed control for maintaining the dehydration rotation speed at the predetermined rotation speed.

In the dehydration step, in order to maintain the rotational speed of the washing tank and the dehydration tank 2 at a predetermined rotational speed (for example, 850 rpm), the microcomputer 17a in the control unit 17 is a reversible capacitor condenser phase type. The drive circuit by intermittently supplying (ON / OFF) electric power to the stator windings 44b1 and 44b2 while referring to the rotational speed (output signal of the rotation detection element 49) of the rotor 45 of the rotary induction motor. The FLS 17f1 at 17f1 is controlled.

Fig. 13 shows the rotational speed characteristics of the motor in the dehydration process. This characteristic is characterized by turning the power supply off when the rotational speed of the motor reaches a predetermined rotational speed (e.g., 850 rpm) and turning on the power supply after a predetermined time (e.g., 6 seconds). This is due to the case where the power supply is intermittently controlled so as to keep at a predetermined rotational speed.

In the control of the intermittent power supply to the above-described motor, if the full voltage power is immediately supplied at the power supply ON and the power supply is immediately disconnected completely from the power supply OFF, the rotor 45 Rotational torque fluctuations occurring at the front end become steep so that the buffering effect of the shock absorbing rod 45f at the rotational torque transmission portion of the clutch mechanism is reduced. In this embodiment, in order to alleviate this reduction in the damping effect, phase control of the voltage waveform of the supplied power is performed in the initial stages of the power supply on and off periods to mitigate the rotational torque fluctuation of the motor. This effect can be achieved in the clutch mechanism from which the shock absorbing rod 45f of the rotational torque transmission portion is removed.

14 and 15 show phase control waveforms of the voltage of the power supplied in the initial stage of the power supply on period and its control table.

In the supplied power control shown in Fig. 14, a voltage waveform phase control operation period T1 in which the constant phase control DELTA t is performed on the voltage waveform of the supplied power is provided in the initial stage of the power supply on period, and thereafter. The sinusoidal voltage operation period T2 is performed.

The phase control angle Δt in the voltage waveform phase control period T1 is set in accordance with the load amount (clothing amount), the power supply frequency, and the rotational speed. As shown in Fig. 15, when the load amount is large, the rotational speed is large. When is high, it is set small. As the information on the load amount, the detected value is used in the detection of the clothing amount, and the rotation speed information is detected based on the output signal from the rotation detection element 49. The phase control angle [Delta] t is set by referring to a control table as shown in Fig. 15 or is achieved by being achieved through arithmetic processing.

As shown in Fig. 16, the phase control can further mitigate the sudden fluctuation of the rotational torque by setting the phase control angle Δt to gradually decrease with the passage of time of the voltage waveform phase control operation period T1.

17 and 18 show phase controlled waveforms of the voltage of the power supplied in the initial stage of the power supply off period and its control table. Here, the power supply off period means an off period as a control period.

The power supply control shown in Fig. 17 is provided after the voltage waveform phase control operation periods T1 to T3 which perform constant phase control (Δt1 to Δt3) on the voltage waveform of the supplied power are provided in the initial stage of the power supply off period. In this case, a period T4 for completely shutting off the power supply is provided.

The voltage waveform phase control periods T1 to T3 are set to constant values irrespective of the load amount (clothing amount), the power source frequency and the rotational speed, and are set large when the load amount is large, and the phase control angles Δt1 to Δt3 are shown in Fig. 18. As shown in Fig. 2, the voltage waveform phase control periods T1 to T3 are set to be large step by step. The phase control angles [Delta] t1 to [Delta] t3 are set with reference to the timer and the control table as shown in Fig. 18 or are set by being achieved through arithmetic processing.

The reduction of the contact sound in such constant speed control can be realized by reducing the number of on-offs of the power supply. When the induction motor of the condenser divided phase type is operated by supplying electric power in a state where the divided phase condenser 44c is separated, the rotational torque is reduced and the rotational speed is lowered. However, the speed drop (deceleration rate) is small. Therefore, by controlling the connection and disconnection of the divided phase capacitor 44c (connection and disconnection of the divided phase capacitor circuit) near the predetermined rotational speed to the operating state of the reversible rotating induction motor of the capacitor divided phase type in the dehydration step, The rotation speed can be increased slowly and can be reduced to maintain a predetermined rotation speed.

Fig. 19 shows a modification of the condenser divided phase type reversible rotary induction motor and drive circuit 17f for performing such driving control. The switch contact 44d1 of the electromagnet relay 44d is connected in series with the divided phase capacitor 44c, and the electromagnet coil 44d2 of the electromagnet relay 44d uses the FLS 17f7 provided in the drive circuit 17f. Controlled. Of course, the FLS 17f7 is controlled by the instruction from the microcomputer 17a.

Regarding the operation control of the motor in the dehydration process, predetermined rotational speeds (highest and lowest rotational speeds, for example, the highest rotational speed = 850 rpm, the lowest rotational speed = 800 rpm) are set, and the rotation detection element 49 in this dehydration process. The rotational speed is detected on the basis of the output signal outputted from the circuit), and the electromagnetic coil 44d2 of the electromagnetic relay 44d is closed and the FLS 17f1 is closed until the rotational speed increases from starting to the maximum rotational speed. The motor is operated in a mode in which the divided phase capacitor 44c is connected to the ON state, the FLS 17f1 is initially turned off, the electromagnet coil 44d2 of the electromagnet relay 44d is opened, and the FLS 17f1 is again turned on. The microcomputer 17a performs control by operating the motor in the mode of turning on the split phase capacitor 44c by turning it on. In this mode of operation, the condenser split phase type reversible rotary induction motor is reduced in rotational torque to reduce the rotational speed. Then, when the rotational speed decreases to the lowest rotational speed, after the FLS 17f1 is initially turned off, the electromagnetic coil 44d2 of the electromagnet relay 44d is opened, and the FLS 17f1 is turned on again to turn on the split phase capacitor. By operating the motor in the mode of connecting 44c, the microcomputer 17a performs control. In this mode of operation, the motor is increased in rotational torque to increase the rotational speed.

The switching of the switch contact 44d1 of the electromagnet relay 44d is preferably performed at a time having a 90 degree phase difference (time when the current flowing through the divided phase capacitor is 0) from the zero-cross timing of the power supply voltage waveform.

Fig. 20 shows the speed control characteristic in this driving control as described above.

Reversed-phase electromagnetic braking, in which power is supplied to the reversible rotating induction motor of the condenser split phase type to generate rotational torque in a direction opposite to the dewatering rotation direction, decelerates the rotation of the washing tank and the dewatering tank 2 when the dewatering process is completed. It is effective in braking. Reverse phase electromagnetic braking can be performed by using a reversible rotary power supply control FLS 17f2 for controlling the power supply to the stator windings 44b1 and 44b2 of the reversible rotary induction motor which reversely rotates the stirring vanes 4. have.

In the DC braking method in which the braking force is generated by applying a DC voltage to the stator windings 44b1 and 44b2 of the induction motor, since an inflow current as large as 14 to 15 A flows during braking, the power supply voltage is lowered to 40 to 59 V so that the control unit ( 17), in particular in the microcomputer 17a may cause a malfunction. On the other hand, since there is no large inrush current in reverse phase electromagnetic braking, there is no malfunction caused by a low power supply voltage.

Since the reversible rotary induction motor generates rotational torque in the reverse rotational direction during reverse electromagnetic braking, the reversible rotary induction motor will rotate in the reverse direction if the power for reverse phase electromagnetic braking continues to be supplied after the rotation stops. However, if the power supply time is insufficient, sufficient braking cannot be performed until the stop of rotation. Therefore, control of the stopping timing of the supply power is an important factor in reverse phase electromagnetic braking. It may be considered to use a control method in which the rotational speed of the rotor 45 of the motor is obtained using the output signal from the rotation detection element 49, and the power supply for reverse phase electromagnetic braking is stopped with reference to the rotational speed. have. However, it is difficult to perform accurate control at low speed because of large detection error.

In this embodiment, in order to stop the power supply more accurately in reverse phase electromagnetic braking, a method of controlling the power supply time of reverse phase electromagnetic braking in response to the load amount (clothing amount) is used.

In the dehydration process, the rate of deceleration of the rotational speed during reverse phase electromagnetic braking varies with the load. Therefore, in one embodiment, the deceleration rate (deceleration time) from one predetermined rotation speed to another predetermined rotation speed is measured, and the reverse phase electromagnetic braking stop time is calculated based on the measured value to control the reverse phase power supply time. .

In addition, the rate of increase of the rotational speed at the start of the dehydration process changes depending on the load amount. Therefore, in another embodiment, the rate of rise (starting time) until reaching a specific rotational speed is measured, and the reverse phase electromagnetic braking stop time is calculated based on the measurement to control the reverse phase power supply time.

Both of these reverse phase power supply time control methods are performed based on the control process using the microcomputer 17a.

Fig. 21 shows the operation control characteristics in the dehydration process in the above-described embodiment. In the dehydration process, power is performed under the condition that the stator winding 44b1 of the reversible rotating induction motor is used as the main winding and the stator winding 44b2 is used as the auxiliary winding by performing on / off control of the FLS 17f1. By supplying it, it performs dehydration operation for a certain time at a certain rotational speed. Next, by turning off the FLS 17f2 after turning off the FLS 17f1, the reverse phase electric power supply is applied under the condition that the stator winding-up 44b2 is used as the main winding and the stator winding-up 44b1 is used as the auxiliary winding. In doing so, reversed electromagnetic braking is started. The deceleration rate (T; deceleration time) at which the rotation speed decreases from R1 to R2 is calculated with reference to the output signal from the rotation detection element 49, and the reverse phase electromagnetic braking stop time t from the rotation speed R2 to the stop is Calculated to control the reverse phase power supply time.

The rotational speeds R1 and R2 to be detected are in a range that can be calculated with reference to the output signal from the rotation detection element 49 by the microcomputer 17a with high precision, and the rotational speed R2 is as low as possible. It is preferable to be set.

Fig. 22A shows the relationship between the load amount and the deceleration time T, and Fig. 22B shows the relationship between the load amount and the reverse phase electromagnetic braking stop time t. Fig. 23 is a control table showing detailed numerical values.

Therefore, the microcomputer 17a controls the reverse phase power supply time by using these kinds of relationships and by calculating the reverse phase electromagnetic stop time t through arithmetic processing or a table reference according to the measured deceleration time T. can do.

Fig. 24 shows the operation control characteristic in the dewatering process in another embodiment described above. In the dehydration process, power is performed under the condition that the stator winding 44b1 of the reversible rotating induction motor is used as the main winding and the stator winding 44b2 is used as the auxiliary winding by performing on / off control of the FLS 17f1. Dehydration operation is carried out for a specific time at a specific rotational speed by supplying. At startup, the startup time TA required to increase the rotational speed to a specific rotational speed is measured. Subsequently, at the end of dehydration, the FLS 17f2 is turned off and the FLS 17f1 is turned on so that the stator winding 44b2 is used as the main winding and the stator winding 44b1 is used as the auxiliary winding. By performing a power supply, reverse phase electromagnetic braking is started. The reverse phase electromagnetic braking stop time (TB) from the rotational speed of R1 to the stop is calculated with reference to the start time TA to control the reverse phase power supply time.

FIG. 25A shows the relationship between the load amount and the start time TA, and FIG. 25B shows the relationship between the load amount and the reverse phase electromagnetic braking stop time TB. Fig. 26 is a control table showing detailed numerical values.

Therefore, the microcomputer 17a uses these kinds of relationships and calculates the reverse phase electromagnetic braking stop time TB through calculation processing or table reference, according to the measured start time TA, to obtain the reverse phase power supply time. Can be controlled.

According to the present invention, by interposing the shock absorbing member between the engagement force rotational force transmission surfaces in the engagement clutch mechanism of the drive device, it is possible to reduce noise generated by repeatedly contacting and disconnecting the engagement force rotational transmission surfaces.

Claims (8)

A washing tank and a dehydration tank rotatably disposed in an outer tank, a stirring vane rotatably disposed inside a bottom of the washing tank and a dewatering tank, and disposed outside the bottom of the outer tank to drive the washing tank, a dehydrating tank and a stirring vane. And a drive device, and a control device, wherein the drive device includes: a reduction gear mechanism, a clutch mechanism, and a reversible rotary motor in an electric washing machine having a configuration in which the reduction gear mechanism, the dehydration tank, and the reversing rotation motor are arranged in series in the vertical direction from the center of the drive rotation shaft of the washing tank, the dehydration tank, and the stirring blade. In And said clutch mechanism has a cushioning member between rotational force transmission surfaces engaged with each other. The electric washing machine according to claim 1, wherein said reversible rotary motor is an induction motor. The electric washing machine according to claim 1, wherein said reversible rotating motor is an inverter motor. 2. The electric machine according to claim 1, wherein the clutch mechanism transmits rotational force through contact surfaces by engagement engagement between an engagement protrusion provided in the rotor of the motor and an engagement protrusion of the slider slidably coupled to the input shaft. washer. The electric washing machine according to claim 4, wherein the buffer member is disposed to be interposed between the contact surfaces on both sides in the rotational direction of the engagement recessed portion. 5. The electric machine according to claim 4, wherein the engaging concave-convex portion is formed of an engaging concave-convex plate provided on the rotor of the motor, and the engaging projection of the slider is made of a resin for forming a slider that slidably engages with the shaft. washer. The electric washing machine according to claim 6, wherein the interlocking convex plate is made of a nonmagnetic metal or resin. The electric washing machine according to any one of claims 1 to 7, wherein the control device controls the rotational speed in the dewatering process to be maintained at a predetermined rotational speed by intermittently supplying electric power to the motor.