KR100510660B1 - 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 which enables a low noise and stable power transmission mode switching. When a power transmission mode switching command is input, the forward / reverse rotation of the BLDC motor is initiated with a preset first stirring force. Repeating for a predetermined number of times, and when the forward / reverse rotation of the BLDC motor according to the first stirring force is completed, the clutch motor is driven and the forward / reverse rotation of the BLDC motor is performed at the preset second stirring force. Repeating for a set number of times; determining whether a switching signal corresponding to a mode to be switched from the cam is input according to the operation of the clutch motor; and if a corresponding switching signal is input from the cam, Continuing driving of the clutch motor; and stopping the clutch motor after the preset time elapses, 3 It consists of a step of repeating the forward / reverse rotation of the BLDC motor for a predetermined number of times with agitation power, thereby preventing damage to the components due to abnormal mode switching and preventing the deterioration of the washing performance by generating the optimum torque during the administration process. Can be.

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, and when dewatering, the pulsator and dewatering tank are simultaneously rotated at high speed to operate in two modes. Structures have emerged, and examples of structures in this manner are described in Japanese Patent Laid-Open No. 11-347289.

However, the method described in Japanese Patent Laid-Open No. 11-347289 has problems such as unstable operation due to solenoid operation of the engagement clutch mechanism at the time of switching the power transmission path, and a lot of noise during engagement of the driving body.

Accordingly, an object of the present invention is to provide a power transmission mode switching method of a washing machine, which is designed to solve the above-described problems, so that a low noise and stable power transmission mode can be achieved.

The present invention includes repeating the forward / reverse rotation of the BLDC motor for a predetermined number of times with a predetermined first stirring force when a power transmission mode switching command is input, and the forward / reverse rotation of the BLDC motor according to the first stirring force. When the clutch motor is completed, driving the clutch motor and repeating the forward / reverse rotation of the BLDC motor for a predetermined number of times with a second predetermined agitation force, and a mode to switch from the cam according to the driving of the clutch motor. Determining whether a corresponding switching signal is input, continuing to drive the clutch motor for a preset time when the switching signal is input from the cam, and stopping the clutch motor when the set time elapses. Thereafter, the step of repeating the forward / reverse rotation of the BLDC motor with a predetermined third stirring force for a predetermined number of times, wherein the first stirring force, Second stirring force and the third stirring force is characterized by a different value to each other.

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.

1 is a schematic view of a washing machine according to the present invention, Figures 2a and 2b is a longitudinal sectional view showing the main action of the clutch mechanism of Figure 1, Figure 3 is a perspective view of the clutch motor of Figure 1, Figure 4 is an exploded perspective view of Figure 3, 5A to 5C are schematic diagrams for explaining an operation relationship between a cam and a switch when the clutch motor is driven, FIG. 5A is a cam and switch state diagram at a washing mode maintenance point, and FIG. 5B is a cam just before switching to the dehydration mode. And FIG. 5C is a cam and switch state diagram at an initial point, FIG. 6 is a time chart showing an operation relationship between a clutch motor, a cam and a switch, and FIG. 7 is a power transmission mode changeover of the washing machine according to the present invention. A flowchart showing the method.

The washing machine according to the present invention, as shown in Figure 1, a dehydration tank (2) for a combined washing tank rotatably installed in the outer tank (1) of the main body, and installed in the dehydration tank (2), the dehydration tank ( 2) a pulsator (3) rotatably installed independently of the 2), and a dehydration shaft (5) rotatably supported by the axial support bearing case (20 (see FIG. 2A)) to transmit rotational power to the dehydration tank (2). And a washing shaft 4 which transmits rotational power to the pulsator 3, a BLDC motor 7 in which the rotor 7b rotates as it is energized by the stator 7a, and a washing stroke or a dehydration stroke. And a clutch mechanism capable of switching the power transmission path of the BLDC motor 7 to the washing shaft 4 or the dewatering shaft 5.

At this time, the clutch mechanism, as shown in Figure 2a and 2b, the clutch motor 6 is installed in the lower portion of the outer tub 1, and the cam 600 coupled to the drive shaft 602 of the clutch motor 6 and The groove 800 having the inclined surface 801 linearly moving with the guide of the lever guide 30 fixed on the shaft support bearing case 20 and the lever guide 30 when the clutch motor 6 is driven. And a lever 8 having a flat surface 802 extending horizontally from the lower end of the inclined surface 801, and between the cam 600 and the lever 8 of the clutch motor 6, the clutch motor 6 is disposed. Connecting rod 17 which acts to pull the lever 8 to the clutch motor 6 side at the time of 'on', and one end of the lever guide 30 is fixed to the front end of the lever guide 30, The other end is fixed to the 803, and the return spring 14, which gives the return force to the lever 8, and the groove 800 having the inclined surface 801 of the lever 8 when dewatering, is washed. It is possible to move up and down along the hollow cylinder-type movable member 9 and the guide groove 900 inside the movable member 9 which are lowered by the inclined surface 801 and are positioned below the flat surface 802 when the draw is switched. The plunger 10 is installed to be installed, the buffer spring 11 positioned between the movable member 9 and the plunger 10, and the gear fixed to the lower portion of the axial support bearing case 20 and formed along the circumferential direction Coupling stopper 22 provided with one end, one end is hinged to the lower end of the plunger 10, the middle one point hinged to the lower end of the support bracket 220 formed on the coupling stopper 22 And a fork-shaped movable rod 12 for seesawing around one point of the hinge-joined intermediate portion during lifting of the plunger, and the dehydration shaft 5 in the rotational direction of the movable rod 12. To change the rotational power transmission path of the BLDC motor (7) The rotational force of the coupling (15) and a rotor (7b) 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.

Hereinafter, the power transmission mode switching method of the washing machine according to the present invention, as shown in FIG.

First, it is determined whether switching to the pulsator mode is required (S71).

And when the determination result (S71), to be switched to the pulsator mode, N times, for example, twice to have a very small angle compared to the rotation angle when washing the BLDC motor 7 with the stirring force 'A' The left and right stirring (S72). As described above, the stirring may be performed for a predetermined time (for example, 1 to 3 seconds) without limiting the number of stirring.

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 pulsator mode position, the step of inverting the BLDC motor 7 to the left and right to release the coupling 15 is carried out. This prevents the rise of).

Subsequently, the cam 600 is rotated by driving the clutch motor, and at the same time, the BLDC motor is agitated M times with stirring force 'B', for example, once (left and right) left and right (S73). In this case, the stirring frequency 'M' may be smaller or greater than that of 'N'.

At this time, the driving of the clutch motor and stirring the BLDC motor at the same time is to prevent the phenomenon that the rising of the coupling 15 is restrained together with the step S72.

Then, it is determined whether the switch 650 is 'on' (S74).

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' (S75).

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.

Then, when the determination result (S75), the AC power input pulse number is more than the predetermined number of pulses to stop the clutch motor (S76), the BLDC motor 7 is stirred N times left and right with the stirring force 'C' (S77). .

The left and right stirring is performed 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), to be switched to the dehydration tank mode, the BLDC motor 7 is stirred N times left and right to have a rotation angle smaller than the rotation angle when washing with the stirring force 'A' (S78). ).

At this time, when switching to the dehydration tank mode, the gear teeth 151 of the coupling 15 and the gear stops 221 of the coupling stopper 22 are staggered by a misalignment with the coupling stopper 22 engaged with the coupling 15. When the surface pressure in the opposite direction between the () between the actuation of the clutch motor (6) can cause the phenomenon that the lowering of the coupling 15 is restrained. 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.

Subsequently, the cam 600 is rotated by driving the clutch motor, and at the same time, the BLDC motor is stirred M left and right with stirring force 'B' (S79).

At this time, the driving of the clutch motor and agitating the BLDC motor is to prevent the phenomenon that the lowering of the coupling 15 is restrained together with the step S78.

Then, it is determined whether the switch 650 is 'off' (S80).

Subsequently, when the switch is 'off', the determination result (S80) counts the number of AC power input pulses and determines whether the counting value is greater than or equal to a predetermined pulse, for example, '66' (S81).

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.

Then, when the determination result (S81), the AC power input pulse number is more than the predetermined number of pulses to stop the clutch motor (S82), the BLDC motor (7) with a stirring force of 'C' a smaller angle than the rotation angle when washing Stir N times left and right to have (S83).

The left and right agitation is performed in the step S83 to prevent the gears of the coupling and the gears of the coupling stopper from operating in a state in which the gear teeth of the coupling are not completely released by the motor or mechanical abnormality. .

In the present invention described above, the stirring force is determined according to the duty of the BLDC motor. That is, since the duty and the stirring force is proportional, the duty is controlled to set the stirring force. In this case, the duty may be determined by various factors, for example, the water level and the input voltage.

Since the water level is proportional to the quantity, when the quantity is divided into large / medium / small, for example, when the quantity is 'large', the duty of the BLDC motor 7 is set to '32 (the maximum duty is 255) 'and the quantity is' Medium ', the duty of the BLDC motor 7 is set to '28 (maximum duty is 255)', and if the capacity is' small ', the duty of the BLDC motor 7 is set to '22 (the highest duty is 255)'. . In other words, the higher the water level, the more agitation is to be performed.

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 ( The maximum duty is 255) ', and when the input voltage is 250V, the duty of the BLDC motor 7 is '42 (the maximum duty is 255)'.

On the other hand, the present invention differentiates the stirring force as 'A', 'B', 'C', 'A', 'B', 'C' as described above, in consideration of factors such as water level or input voltage You can do it at the same level, you can do it differently, or you can make one or more of them bigger. This may be a slight error even if the stirring force is set in consideration of factors such as water level or input voltage, so that the 'A', 'B', 'C' is different, the original purpose, that is, the coupling of the coupling This is to ensure that the gear teeth of the ring stopper are correctly engaged or disengaged.

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 stirred left and right to prevent the restraint of the coupling and then starts the mode change to drive the clutch motor. At the same time, the BLDC motor is driven again to prevent the restraint of the coupling, and after stopping the clutch motor, the BLDC motor is stirred again, and the mixing force of the coupling and the coupling stopper is completed by differentiating the stirring force during the left and right stirring. The noise is minimized during the mode change, and the damage of parts due to the abnormal mode change is prevented, and the optimum torque is generated during the progression of the stroke, thereby reducing the washing performance.

1 is a schematic view of a washing machine according to the present invention

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.

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, Repeating forward / reverse rotation of the BLDC motor for a predetermined number of times with a first predetermined agitation force when a power transmission mode switching command is input; When the forward / reverse rotation of the BLDC motor according to the first stirring force is completed, simultaneously driving the clutch motor and repeating the forward / reverse rotation of the BLDC motor for a predetermined number of times with a second preset stirring force; 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; After the set time has elapsed, the clutch motor is stopped, and the forward / reverse rotation of the BLDC motor is repeated for a predetermined number of times with a predetermined third stirring force. The first stirring force, the second stirring force and the third stirring force is a power transmission mode switching method of the washing machine, characterized in that different values. According to claim 1, The step of stirring the left and right BLDC motor is a step of stirring the power transmission mode of the washing machine, characterized in that the step of stirring at a small angle compared to the rotation angle of the BLDC motor during washing or rinsing. delete delete