KR100510659B1 - method for switching driving power transmission mode of washing machine - Google Patents

Abstract

The present invention relates to a power transmission mode switching method of a washing machine to accurately change the power transmission mode. When a power transmission mode switching command is input, the current input voltage supplied to the BLDC motor is sensed, and a duty for each input voltage is predetermined. Setting a duty value of the BLDC motor corresponding to the sensed input voltage with reference to a value; repeating forward / reverse rotation of the BLDC motor for a predetermined number of times with the set duty value according to a current input voltage; When the process of repeating the forward / reverse rotation of the BLDC motor is completed, driving the clutch motor to rotate the cam, and a switching signal corresponding to a mode to be switched from the cam according to the driving of the clutch motor Determining whether or not the input signal is input; and when a corresponding switching signal is input from the cam, Mode of driving the clutch motor and stopping the clutch motor when the set time elapses, and then repeats the forward / reverse rotation of the BLDC motor with the set duty value for a predetermined number of times. This prevents damage to parts due to abnormal mode switching and the optimum torque is generated during the progress of the stroke, thereby preventing the washing performance deterioration.

Description

Method for switching driving power transmission mode of washing machine}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine, and more particularly, a power transmission mode of a washing machine having a new power transmission mechanism in which washing and rinsing are performed by a pulsator rotating at a low speed, and dehydration is performed by a dehydration tank rotating at a high speed. It relates to a conversion method.

In general, a washing machine is a product that removes various contaminants attached to clothes, bedding, etc. by using the emulsification of the detergent and the friction action of the water flow due to the rotation of the washing blade, and the impact of the pulsator on the laundry. By detecting the amount and type of laundry, the washing method is automatically set, and the water level of the washing water is supplied to the appropriate level according to the amount and type of the laundry, and then washing is performed under the control of the microcomputer.

In addition, the driving method of the conventional fully automatic washing machine is a method of rotating the pulsator or the dehydration tank by transmitting the rotational power of the drive motor to the washing shaft through the power transmission belt and pulley, or to the dehydration shaft, and BLDC motor ( There is a method of rotating the washing tank and dehydration tank at different speeds when washing and dehydrating by speed control of Brushless DC Motor.

On the other hand, in recent years, while using a BLDC motor, the power transmission path is controlled differently, and when washing, the pulsator is rotated at low speed to perform washing. A structure has appeared, and a structure example of this manner will be described with reference to FIGS. 1 to 2B.

Dehydration tank (2) which is a combined use of the washing tank rotatably installed in the outer tank (1) of the main body, and a pulsator (3) installed in the dehydration tank (2), but rotatably installed independently of the dehydration tank (2). And a dehydration shaft 5 which is rotatably supported by the axial support bearing case 20 (refer to FIG. 2A) and transmits rotational power to the dehydration tank 2, and washes to transmit rotational power to the pulsator 3. The power transmission path of the BLDC motor 7 in response to the washing stroke or the dehydration stroke and the BLDC motor 7 in which the rotor 7b rotates as the shaft 4 and the stator 7a are energized, are supplied to the washing shaft 4. Or a clutch mechanism switchable to the dehydration shaft (5).

In this case, the clutch mechanism includes a clutch motor 6 installed below the outer tub 1, a cam 600 coupled to the drive shaft 602 of the clutch motor 6, and the shaft support bearing case 20. Lever 30 is fixed on the groove, and the groove 800 and the inclined surface 801 having a linear movement and linearly guided by the guide of the lever guide 30 when the clutch motor 6 is driven A lever 8 having a flat surface 802 extending horizontally from the cam, and between the cam 600 and the lever 8 of the clutch motor 6 so as to be 'on' the lever 8 of the clutch motor 6. ) Is connected to the connecting rod 17 to pull the clutch motor 6 side, and one end is fixed to the front end of the lever guide 30 and the other end is fixed to the engaging projection 803 on one side of the lever 8 (8) abuts against the return spring (14) for imparting a return force and the groove (800) having the inclined surface (801) of the lever (8) when dewatering, and then inclining when switching to the washing mode. A hollow cylinder-type movable member 9 which is lowered on the flat surface 802 by the 801 and a plunger installed to be elevated along the guide groove 900 inside the movable member 9 ( 10), a buffer spring 11 positioned between the mover 9 and the plunger 10, and a gear 221 fixed to the lower portion of the axial support bearing case 20 and formed along the circumferential direction is provided. One end is hinged to the lower end of the coupling stopper 22 and the plunger 10, and a middle point is hinged to the lower end of the support bracket 220 formed below the coupling stopper 22. BLDC while elevating along the dehydration shaft 5 along the rotational direction of the fork-shaped movable rod 12 and the movable rod 12 in a fork-shaped movable rod 12 centered around one point of the hinge-coupled intermediate portion. Coupling 15 for switching rotational power transmission path of motor 7 and rotor 7b The rotational force is configured to include a connector assembly 16 which is interposed to be transmitted to the washing shaft (4).

3 and 4, the cam 600 is directly coupled to the drive shaft 602 such that the cam 600 rotates at a constant speed when the drive shaft 602 is rotated, and the drive shaft 602 is rotated. Cam 600 is also stopped at the stop position, the operation relationship between the cam and the switch will be described as follows.

First, in the state where the cam 600 is located at the initial point, the switch 650 maintains the off state. Here, the state where the cam 600 is located at the initial point is a state in which the rod connecting shaft 601 of the cam 600 faces the initial point direction as shown in FIG. 5C.

In this state, when the power transmission path is switched for washing, the clutch motor 6 is turned on and driven, thereby rotating the cam 600 clockwise. At this time, since the projection 650a of the switch 650 is located on the cam groove surface 600a until the rotation angle of the cam 600 reaches a position that is 150 degrees from the initial point, the switch 650 is turned off. State is maintained.

Then, when the rotation angle from the initial point of the cam 600 reaches 150 degrees, the projection 650a of the switch 650 is out of the cam groove surface 600a of the cam 600, so that the switch 650 is turned on. (on)

As such, when the rotation angle from the initial point of the cam 600 reaches 150 degrees, the peak of the gear 151 of the coupling 15 and the peak of the gear 221 of the coupling stopper 22 It is in a state of being in mutual engagement.

However, even after that, the on state of the clutch motor 6 continues, and when the cam 600 reaches the point 170 degrees from the initial point as shown in FIG. 5A, the clutch motor 6 is turned off. Thus, the clutch motor 6 ) Is turned off at the maintenance point of the cam 600 in order to more reliably switch the power to the washing mode.

On the other hand, when dehydration after washing is completed, the cam 600 should return to the initial point position.

To this end, when the power is switched to the dehydration mode, the clutch motor 6 is turned on again to rotate the cam 600 clockwise. At this time, the switch 650 maintains the on state, and when the rotating cam 600 passes the point 328 degrees clockwise from the initial point (158 degrees clockwise from the holding point), the protrusion of the switch 650 ( 650a is positioned on the cam groove surface 600a, whereby the switch 650 is turned off by contact dropping (see FIG. 5B).

Thereafter, even if the switch 650 is switched to the off state, the clutch motor 6 remains in the on state until the cam 600 reaches the initial point under the control of the microcomputer, so that the cam 600 is positioned at the initial point. Is off.

At this time, to keep the clutch motor 6 in the 'on' state immediately after the switch 650 is turned off until the cam 600 reaches the initial point is the AC power pulse supplied to the clutch motor 6. It is made by counting the number of times. Since the cycle of one rotation of the clutch motor 6 is constant, if the angle of arrival (that is, 32 degrees) from the off point of the switch 650 to the initial point is divided by one cycle, the clutch motor 6 The on-time holding time of is calculated and the actual clutch motor 6 control is performed by counting the number of pulses corresponding thereto.

On the other hand, in the state where the cam 600 is located at the initial point as described above, not only the gear teeth 151 of the coupling 15 and the gear teeth 221 of the coupling stopper 22 are released, but the coupling ( 15) The upper serration 150a and the lower serration 150b of the inner circumferential surface of the lower serration 161b on the outer circumferential surface of the upper end of the inner connector 16b coupled to the washing shaft 4 and the lower end of the dehydration shaft 5 By being engaged with each other at the same time, the dehydration by simultaneous rotation of the washing shaft 4 and the dewatering shaft 5 can be made.

The method of switching to the pulsator mode used when the washing or the rinsing stroke is performed among the power transmission mode switching methods of the washing machine configured as described above is as follows.

The clutch mechanism according to the present invention maintains a state in which the coupling 15 is lowered as shown in FIG. 2B as an off state in which power is not applied to the clutch motor 6 before washing is started.

That is, at this time, the mover 9 is located in the groove 800 having the inclined surface 801 of the lever 8, and the coupling 15 is located at the bottom dead center.

In this state, when power is applied to the clutch motor 6 and the clutch motor 6 is on, the driving force of the clutch motor 6 is transmitted to the cam 600, and the cam 600 rotates. By the movement, the connecting rod 17 is moved toward the clutch motor 6, whereby the lever 8 is guided by the lever guide 30 and the lever 8 is pulled toward the clutch motor 6.

At this time, the return spring 14 installed at the rear end of the lever guide 30 is tensioned.

On the other hand, when the cam 600 rotates, the mover 9 which contacts the inclined surface 801 of the lever 8 is pushed down by the inclined surface 801, and a point in time at which the cam 600 is located at a holding point. In FIG. 2A, the mover 9 is positioned below the flat surface 802 of the lever 8.

In this way, when the movable member 9 is lowered due to the rotation of the cam 600 to the holding point and the movement of the lever 8 toward the clutch motor, the movable member 9 compresses the shock absorbing spring 11. Accordingly, the plunger 10 installed to move up and down along the guide groove 900 of the mover 9 is also lowered.

Subsequently, the movable rod 12 hinged to the plunger 10 according to the lowering of the plunger 10 is a support bracket 220 of the coupling stopper 22 fixed to the lower portion of the shaft support bearing case 20. It rotates counterclockwise on the drawing about the fixing pin 12b at one point of the middle portion penetrating the center.

In this way, when the movable rod 12 is rotated counterclockwise in the drawing about the fixing pin 12b, the tip of the movable rod 12 contacts the lower surface of the coupling 15 so that the coupling ( 15) is pushed up along the dehydration shaft (5) in the axial direction.

Accordingly, upon completion of power switching to the washing mode, the gear 151 formed at the upper end of the coupling 15 is fixed to the lower surface of the shaft support bearing case 20 as shown in FIG. 2A. The gear provided in the stopper 22 is matched to 221.

In addition, when the gear 151 of the coupling 15 is engaged with the gear 221 of the coupling stopper 22 in this manner, the coupling 15 is out of the connector assembly 16, so that Only the washing shaft 4 is rotated during rotation.

That is, during washing, the coupling 15 is engaged only with the serration of the outer circumferential surface of the dehydration shaft 5, and is not engaged with the serration 161b of the upper end of the inner connector 16b engaged with the washing shaft 4. Therefore, the rotational power of the rotor 7b is transmitted only to the pulsator 3 through the washing shaft 4.

In the state where the gear 151 of the coupling 15 is engaged with the gear 221 of the coupling stopper 22, the rotation of the coupling 15 is caused by the gear 221 of the coupling stopper 22. Is prevented.

Next, the method of switching to the dehydration tank mode according to the dehydration is as follows.

When washing is performed in the state as shown in FIG. 2A, when washing is completed and power transmission path switching to a dehydration tank mode is required for dehydration, power is supplied to the clutch motor 6 again to drive the clutch motor. As a result, the cam 600 rotates.

As such, when the cam 600 of the clutch motor 6 rotates to move to the dewatering position, the lever 8 is moved away from the clutch motor 6 by the restoring force of the return spring 14.

Accordingly, in the washing mode, the movable member 9 in contact with the flat surface 802 of the lever 8 is inclined surface 801 of the lever 8 when the return of the lever 8 is completed as shown in FIG. 2B. The groove 800 is provided.

As such, when the movable member 9 rises due to the movement of the lever 8, the compressive force applied to the shock absorbing spring 11 is alleviated, and thus the movable member 9 can be elevated along the guide groove 900 of the movable member 9. The installed plunger 10 is also raised.

Subsequently, the movable rod 12 hinged to the plunger 10 as the plunger 10 rises is supported by the support bracket 220 of the coupling stopper 22 fixed to the lower portion of the axial support bearing case 20. It rotates clockwise on the drawing (refer to FIG. 2A) centering on the fixing pin 12b installed through.

Then, as the movable rod 12 rotates clockwise in the drawing about the fixing pin 12b, the tip of the movable rod 12 supports the coupling 15 along the dewatering shaft 5. The force pushing up in the axial direction is removed.

As the bearing force of the movable rod 12 with respect to the coupling 15 is removed as described above, the coupling 15 is lowered by the self-weight and the restoring force of the compression spring 40, and thus the coupling 15 The gear teeth 151 of the c) come out of the gear 221 of the coupling stopper 22.

When the coupling 15 is completely lowered, the serrations 150a and 150b of the inner circumferential surface of the coupling 15 are serrations 161b on the outer circumferential surface of the upper end of the inner connector 16b coupled to the washing shaft 4. And it is engaged with the serration of the lower end of the dehydration shaft (5), respectively, so that the high-speed rotation of the washing shaft (4) and the dehydration shaft (5) during the high-speed rotation of the rotor (7b) proceeds to dehydration.

The above-mentioned washing machine converts the power transmission path of the BLDC motor into a pulsator or a dehydration tank by using a clutch. Since the gear of the coupling and the gear of the coupling stopper are engaged with each other or engaged, the coupling is released. When driving the clutch motor and changing the mode according to the on / off of the switch associated with the cam, washing or dehydration may be performed without the physical coupling being performed, resulting in damage to related parts or washing normally. There is no problem.

Accordingly, an object of the present invention is to provide a method for switching a power transmission mode of a washing machine in which the power transmission mode switching can be accurately performed.

The present invention senses the current input voltage supplied to the BLDC motor when a power transfer mode switch command is input and refers to a duty value of the BLDC motor corresponding to the detected input voltage with reference to a predetermined duty value for each input voltage. Setting the step, repeating the forward / reverse rotation of the BLDC motor for a preset number of times with the set duty value according to the current input voltage, and when the process of repeating the forward / reverse rotation of the BLDC motor is completed, the clutch Driving a motor to rotate the cam; determining whether a switching signal corresponding to a mode to be switched from the cam is input according to the driving of the clutch motor; and when the switching signal is input from the cam, Continuing driving of the clutch motor for a preset time; and stopping the clutch motor after the set time has elapsed. And then it characterized by comprising the step of repeating for a preset number of the forward / reverse rotation of the back to the BLDC motor to the set duty value.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the power transmission mode switching method of the washing machine according to the present invention will be described in detail.

7 is a flowchart illustrating a method of switching a power transmission mode of a washing machine according to the present invention.

In the method of switching the power transmission mode of the washing machine according to the present invention, as shown in FIG. 7, first, it is determined whether the switching to the pulsator mode is required (S71).

Subsequently, when the determination result (S71) is to be switched to the pulsator mode, the stirring force is set according to the input voltage (S72), and the BLDC motor 7 is set at an angle smaller than the rotation angle when washing with the set stirring force. The left and right stirring is performed for N times (for example, two times) or for a set time (1 to 3 seconds) to have (S73).

At this time, the serrations 150a and 150b of the inner circumferential surface of the coupling 15 are separated from the lower end of the dehydration shaft 5 by staggering the dehydration shaft 5 engaged with the coupling 15 and the inner connector 16b. And by receiving the surface pressure acting in the opposite direction from the serration (161b) of the upper end of the inner connector (16b) may cause the phenomenon that the coupling 15 is restrained when the clutch motor is driven. Therefore, before performing the step of raising the coupling 15 to the washing mode position, the step of inverting the BLDC motor 7 to the left and right to release the coupling 15 is performed. This prevents the phenomenon of rising.

In addition, the stirring force is set according to the input voltage, that is, the voltage supplied to the BLDC motor, and the input voltage is proportional to the torque of the BLDC motor. In other words, when the input voltage is high, the motor torque becomes large, and when the input voltage is low, the motor torque becomes small. Therefore, if the input voltage is high, the duty of the BLDC motor is reduced, and if the input voltage is low, the duty is increased. Eventually, the duty for each input voltage is tabled through experiments so as to have the same stirring force regardless of the variation of the input voltage. use.

For example, when the input voltage is 310V level, the duty of the BLDC motor 7 is '22 (maximum duty is 255) ', and when the input voltage is 300V level, the duty of the BLDC motor 7 is '28 (highest). Duty is 255) ', and when the input voltage is 250V level, the duty of the BLDC motor 7 is '42 (maximum duty is 255)'.

Then, by driving the clutch motor (S74), the cam 600 is rotated and determines whether the switch 650 is 'on' (S75).

Subsequently, when the switch is 'ON', the determination result (S75) counts the number of AC power input pulses and determines whether the counting value is greater than or equal to a preset pulse number, for example, '66' (S76).

The driving of the clutch motor by counting the number of pulses while the switch is 'on' is for the gear teeth of the coupling and the gear stop of the coupling stopper to be firmly engaged.

When the determination result (S76), the number of AC power input pulse is more than the predetermined number of pulses (S77), the clutch motor is stopped (S77), so that the BLDC motor 7 instantaneously has a smaller angle than the rotation angle when washing ( The left and right stirring is performed for N times (for example, two times) or a set time (1 to 3 seconds) with the stirring force set in S72) (S78).

The left and right agitation is performed twice to prevent the gears of the coupling and the gears of the coupling stopper from operating in an incomplete state due to a motor or mechanical abnormality.

On the other hand, when the determination result (S71), when washing or rinsing is completed and should be switched to the dehydration tank mode in order to perform dehydration, the stirring force is set according to the input voltage (S79), and the BLDC motor 7 momentarily The left and right stirring is performed for N times (for example, two times) or for a set time (1 to 3 seconds) with the stirring force set in the step S79 to have an angle smaller than the rotation angle at the time of washing (S80). . Here, the stirring force setting step (S79) is applied to the same method as the step (S72).

At this time, when switching to the dehydration mode after the end of the washing, the gear 151 of the coupling 15 and the coupling stopper 22 of the coupling stopper 22 by the gap between the coupling stopper 22 engaged with the coupling 15 Surface pressure in opposite directions between the 221 may act to restrain the coupling 15 from falling when the clutch motor 6 is driven. Therefore, the step of inverting the BLDC motor 7 to the left and right to release the coupling 15 immediately before performing the step of lowering the coupling 15 to the dehydration mode position.

Then, the clutch motor is driven (S81), the cam 600 is rotated, and it is determined whether the switch 650 is 'off' (S82).

Subsequently, when the switch is 'off', the determination result (S82) counts the number of AC power input pulses and determines whether the counting value is greater than or equal to a preset pulse number, for example, '66' (S83).

In this case, the driving of the clutch motor by counting the number of pulses in the 'off' state of the switch is to completely disengage the gear teeth of the coupling and the gear teeth of the coupling stopper.

When the determination result (S83), the number of AC power input pulse is more than the predetermined number of pulses (S84), the clutch motor is stopped (S84), and the step so that the BLDC motor (7) has an angle smaller than the rotation angle when washing the instantaneously ( The left and right stirring is performed for N times (for example, twice) or a set time (1 to 3 seconds) with the stirring force set in S79) (S85).

The left and right agitation is performed twice in order to prevent the gears of the coupling and the gears of the coupling stopper from operating in a state in which the coupling between the gears of the coupling and the coupling stopper is not completely released.

In the method of switching the power transmission mode of the washing machine according to the present invention, in switching the pulsator mode and the dehydration tank mode, the BLDC motor is operated with the optimum stirring force according to the input voltage before and after performing the mode switching by actually driving the clutch motor. Because the left and right stirring at the moment, the mode change is made correctly, thus preventing the damage of parts due to the abnormal mode change, and the optimum torque is generated during the administration, thereby preventing the washing performance deterioration.

1 is a schematic diagram of a fully automatic washing machine

2A and 2B are principal part longitudinal sectional views which show the action of the clutch mechanism of FIG.

3 is a perspective view of the clutch motor of FIG.

4 is an exploded perspective view of FIG.

5A to 5C are schematic diagrams for explaining an operation relationship between a cam and a switch when the clutch motor is driven.

Figure 5a is a state diagram of the cam and switch at the washing mode maintenance point

5B is a cam and switch state diagram immediately before switching to the dehydration mode;

5C is a cam and switch state diagram at an initial point

6 is a time chart showing an operation relationship between a clutch motor, a cam, and a switch;

7 is a flowchart illustrating a method for switching a power transmission mode of a washing machine according to the present invention.

Claims (4)

A coupling for selectively transmitting the power of a brushless DC (BLDC) motor to the washing shaft or the dehydration side, a clutch motor for driving the coupling, and a rotational rotation with the clutch motor and outputting a switching signal according to the rotation. In the power transmission mode switching method of the washing machine provided with a cam, Detecting a current input voltage supplied to the BLDC motor when a power transmission mode switching command is input, and setting a duty value of the BLDC motor corresponding to the detected input voltage with reference to a predetermined duty value for each input voltage; Wow, Repeating forward / reverse rotation of the BLDC motor for a preset number of times with the set duty value according to a current input voltage; When the process of repeating the forward / reverse rotation of the BLDC motor is completed, driving the clutch motor to rotate the cam; Determining whether a switching signal corresponding to a mode to be switched from the cam is input according to the driving of the clutch motor; Continuing driving of the clutch motor for a preset time when the corresponding switching signal is input from the cam; And stopping the clutch motor after the set time has elapsed and repeating the forward / reverse rotation of the BLDC motor for a predetermined number of times with the set duty value. delete According to claim 1, The step of repeating the forward / reverse rotation of the BLDC motor is a power transmission mode switching method of the washing machine, characterized in that for rotating or rotating at a smaller angle than the rotation angle of the BLDC motor during washing or rinsing. delete