KR20150104426A - Washing machine and Control method of the same - Google Patents

Abstract

The present invention relates to a washing machine and a method of controlling the same. The method of controlling a washing machine according to an embodiment of the present invention, with respect to a method of controlling a washing machine which includes an external drum which can contain washing water, an internal drum which is rotatable and accommodates laundry by being installed in the external drum, and a motor rotating the internal drum, includes a water supply step which supplies washing water to the external drum; and a conversion step which gradationally increases or decreases the target velocity of the motor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a washing machine and a control method for the washing machine, and more particularly, to a washing machine and its control method for preventing noise and vibration by preventing bunching of the laundry.

Generally, a washing machine refers to various devices that treat a cloth by applying a physical action and / or a chemical action to a laundry (hereinafter referred to as "foam") such as clothing and bedding. The washing machine includes an outer tank in which washing water is contained, an inner tank in which a bag is placed and rotatably installed in the outer tank, and a pulsator is rotatably provided on the bottom of the inner tank. The motor rotates at least one of the pulsator and the inner tank. The bubbles rub against the inner or the pulsator, flow in the inner tank and separate from the contamination.

Conventionally, the motor is rotated at a predetermined speed and a predetermined angle for cleaning the can. However, if the pod is rotated in the unified state, the rotation of the inner tub becomes unstable. In addition, when the inner tub is eccentrically rotated, the inner tub and the outer tub collide with each other, causing vibration and noise.

A first problem to be solved by the present invention is to prevent the eccentricity of the inner tub, thereby stably rotating the inner tub.

Second, it minimizes the vibration and noise of the washing machine.

Third, the dehydration of laundry is increased at the end of dewatering.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method of controlling a washing machine, the method including controlling a washing machine including an outer tank for receiving washing water, an inner tank rotatably disposed in the outer tank, The method comprising: a water supply step of supplying wash water to the outer tank; And a converting step of gradually increasing or decreasing a target speed of the motor.

The converting step changes the rotating direction when the motor rotates by an alternate angle.

The alternating angle forms an increasing or decreasing directionality each time the motor changes its direction of rotation.

The target velocity has an increasing or decreasing directionality, and the directionality of the target velocity and the direction of the alternating angle may be the same.

The converting step may change the target speed when the rotation direction of the motor is changed.

The target speed of the motor during the conversion step linearly increases or decreases. The control method of a washing machine according to an embodiment of the present invention includes a main step of keeping the target speed constant, and the converting step includes an initial step of gradually increasing the target speed before the main step; And a later step of gradually reducing the target speed after the main step.

The main step may change the direction of rotation when the motor rotates by an alternating angle, and the alternating angle may be constant during the main step.

The control method of a washing machine according to an embodiment of the present invention includes a drain step of discharging wash water accommodated in the outer tank when the motor stops after completion of the later step.

Wherein the converting step comprises: a plurality of applying steps for applying a driving current required for the target speed; And at least one dormant step of stopping current application between the plurality of application steps.

A control method of a washing machine according to an embodiment of the present invention is a control method of a washing machine including an inner tub that accommodates a bell and a motor that rotates the inner tub, the method comprising: an initial step of increasing an alternating angle stepwise; A main step of keeping the alternating angle constant; And a later step of stepwise decreasing the alternate angle.

A washing machine according to an embodiment of the present invention includes: an inner tub for accommodating a cloth; An outer tub for receiving the inner tub; A motor for generating a rotational force for rotating the inner tub; And a controller for increasing or decreasing a target speed of the motor by increasing or decreasing a driving current applied to the motor.

The washing machine according to an embodiment of the present invention includes a water supply unit for supplying washing water to the outer tank, and the controller may increase the target speed of the motor stepwise after the water supply unit is driven.

The washing machine according to an embodiment of the present invention includes a drainage unit for draining washing water stored in the outer tub, and the control unit stops the motor by gradually reducing the target speed of the motor, and then drives the drainage unit.

The washing machine according to the embodiment of the present invention includes a memory for storing an alternating angle which is a period for changing the target speed of the inner tank and the rotational direction of the motor in conjunction with the target speed.

The details of other embodiments are included in the detailed description and drawings.

According to the present invention, there is one or more of the following effects.

First, the laundry can be spread evenly in the inner tank, so that the inner tank rotates stably.

Second, since the rotation axis of the inner tank is formed vertically, collision with the outer tank is prevented.

Third, since the rotation of the inner tub is stable, the noise and vibration of the washing machine are reduced.

Fourth, since the maximum rotation speed of the inner tub is increased, the inner tub can be rotated at a high speed, thereby increasing the dehydration. The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a sectional view of a washing machine according to an embodiment of the present invention.
2 is a block diagram of a controller and a peripheral configuration according to an embodiment of the present invention.
3 is a flowchart illustrating a method of controlling a washing machine according to an embodiment of the present invention.
FIG. 4 is a graph showing an alternating angle and a target speed of a motor according to an embodiment of the present invention.
FIG. 5 represents the conversion step and the main step.
6 is a graph showing the rotational speed and the target speed of the actual motor during the conversion step and the main step.
FIG. 7 shows the target speed and the alternating angle stored in the database.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a method of controlling a washing machine and a washing machine according to embodiments of the present invention.

1 is a sectional view of a washing machine according to an embodiment of the present invention. 2 is a block diagram of a controller and a peripheral configuration according to an embodiment of the present invention. 3 is a flowchart illustrating a method of controlling a washing machine according to an embodiment of the present invention.

A control method of a washing machine according to an embodiment of the present invention includes an outer tank 122 for receiving washing water, an inner tank 115 rotatably disposed in the outer tank 122, A control method of a washing machine including a motor (130), comprising: a water supplying step (S10) of supplying wash water to the outer bath (122); And a converting step (S50) for gradually increasing or decreasing a target speed of the motor (130).

The control unit 220 opens the water supply valve 135 during the water supply step S10. The control unit 220 opens the water supply valve 135 to supply the wash water to the outer tub 122. [ The wash water flows through the water supply hose 118 to the outer tank 122 via the detergent box 134 (134). The control unit 220 increases or decreases the target speed during the conversion step S50. The storage unit may store the target speed during the conversion step (S50). The control unit 220 ends the conversion step S50 when the speed of the motor 130 is increased or decreased to reach a predetermined final speed. The conversion step S50 may be a step of increasing or decreasing the driving current applied to the motor 130 step by step.

For example, the target speed may increase or decrease between 40 rpm, 60 rpm, 80 rpm, 100 rpm, 120 rpm during the conversion step S50. The final speed may be 120 rpm if the speed of the motor 130 increases. The final speed may be 0 rpm if the speed of the motor 130 is decreasing. That is, the control unit 220 may terminate the conversion step S50 by stopping the motor 130 in the case of the conversion step S50 in which the speed of the motor 130 is reduced.

The washing machine 100 includes a cabinet 111 forming an outer appearance and having an upper portion opened, a cabinet cover 112 disposed at an opened upper portion of the cabinet 111 and having a laundry inlet / An outer tub 122 which is housed in the outer tub 122 and which is held in the cabinet 111 by a supporting member 117 and is buffered by a damper 119, And an inner tub 115 which rotates about the center of the tub 115 and receives the laundry.

A plurality of water holes (not shown) are formed in the inner tub 115 so that the washing water can circulate between the outer bath 122 and the inner tub 115. A laundry inlet / h are formed on the outer surface of the outer cover 114.

The inner tank 115 is provided at its bottom with a pulsator 116 forming a water stream in the washing water and a rotating force is generated below the outer tub 122 to rotate the inner tank 115 and / A motor 130 is disposed. Hereinafter, the inner tank 115 and / or the pulsator 116 are collectively referred to as water flow forming portions 115 and 116 that form a water flow in the washing water.

The cabinet cover 112 is provided with a control panel 124 for receiving a command from the user for the overall operation of the washing machine 100. A detergent box A detergent box housing 136 for detachably receiving the detergent box 134 and a detergent box 134 and for supplying a washing water introduced from the water supply hose 119 to the inner tank 115 via the detergent box 134, . The dispensing hole 136h may be formed in the detergent box housing 136 so that the wash water introduced from the water supply hose 119 is distributed to the detergent box 134. [

The drain hose 142 and the drain pump 144 drain the wash water from the outer tank 122. The cabinet cover 112 is provided with a control panel 124 for receiving a command from the user for the overall operation of the washing machine 100. A detergent box A detergent box housing 136 for detachably receiving the detergent box 134 and a detergent box 134 and for supplying a washing water introduced from the water supply hose 119 to the inner tank 115 via the detergent box 134, .

The dispensing hole 136h may be formed in the detergent box housing 136 so that the wash water introduced from the water supply hose 119 is distributed to the detergent box 134. [ The motor 130 rotates the water flow forming portions 115 and 116. The motor 113 includes a stator 130a having a coil wound thereon and a rotor 130b rotating to generate an electromagnetic interaction with the coil.

The stator 130a is provided with a plurality of winded coils and an internal resistance. The rotor 130b is provided with a plurality of magnets that generate an electromagnetic interaction with the coil. The rotor 130b rotates by electromagnetic interaction between the coil and the magnet. The rotational force of the rotor 130b is transmitted to the water flow forming parts 115 and 116 to rotate the water flow forming parts 115 and 116. [

The motor 130 is provided with a Hall sensor 130c for measuring the position of the rotor 130b. The hall sensor 130c generates an on / off signal by the rotation of the rotor 130b. And estimates the rotational speed and position of the rotor 130b through the on / off signal generated by the hall sensor 130c.

The control unit instructs the motor 130 to apply the driving current. The inverter 210 outputs a power according to the PWM signal and supplies the power to the coil of the stator 130a of the motor 130. [ During the formation of the stirring water flow, the motor 130 rotates in a predetermined direction to rotate the water flow forming parts 115 and 116.

FIG. 4 is a graph showing an alternating angle and a target speed of a motor according to an embodiment of the present invention.

The conversion step S50 changes the direction of rotation when the motor 130 rotates by an alternate angle. The control unit 220 changes the rotation direction of the motor 130 to rotate the motor 130 and change the direction of the rotating water flow so that the water flow forming units 115 and 116 form a rotating water flow. The control unit 220 changes the rotation direction of the rotor 130b. When the rotation angle of the rotor 130b reaches a predetermined angle, the control unit 220 stops the rotation and rotates the rotor 130b in the opposite direction.

The control unit 220 instructs the inverter 210 to change the direction of the current. The motor 130 changes the direction of rotation of the rotor 130b when the direction of the applied current is changed. The control unit 220 receives a signal from the hall sensor 130c. The hall sensor 130c provides the position and angle information of the rotor 130b to the control unit 220. [ The control unit 220 rotates the rotor 130b in the opposite direction when the rotation angle of the rotor 130b reaches the alternate angle.

The alternating angle can be set according to the target speed. The alternating angle and target speed are stored in the storage unit. The control unit 220 brakes and / or reversely brakes the motor 130 to form a stirring water flow. The control unit 220 changes the rotation direction of the motor 130 through the reverse phase braking.

Wherein the alternating angle has a direction that increases or decreases each time the motor (130) changes its direction of rotation. The alternating angle has an increasing or decreasing directionality. For example, the alternating angles can be increased by 60, 120, 270, 300 and 360 degrees. As another example, the alternating angles can be reduced in order of 360, 300, 270, 120 and 60 degrees.

The control unit 220 can change the alternating angle when changing the application direction of the current. For example, the control unit 220 controls the rotation direction of the motor 130 so that the motor 130 rotates 60 ° clockwise, then rotates 80 ° counterclockwise, and rotates 100 ° clockwise . As another example, the controller 220 may change the alternate angle when the application direction of the current is restored to the initial state. For example, the control unit 220 rotates the motor 130 by 60 degrees in the clockwise direction, rotates the motor 130 counterclockwise by 60 degrees, rotates the motor 130 by 80 degrees in the clockwise direction, rotates the motor by 80 degrees in the counterclockwise direction The rotation direction of the motor 130 is controlled.

The control unit 220 may change the alternating angle every time the motor 130 is controlled in reverse phase, or may change the alternating angle at the end of one period with two reverse phase control periods. Wherein the target speed has an increasing or decreasing directionality, and the directionality of the target speed and the direction of the alternating angle are the same. The driving current has a directionality that increases or decreases, and the directionality of the driving current and the direction of the alternating angle may be the same.

For example, the target speed may exhibit increasing direction in the order of 40 rpm, 60 rpm, 80 rpm, 100 rpm, and 120 rpm in the conversion step S50. In this case, the alternating angles can be increased by 60 °, 120 °, 270 °, 300 °, and 360 °.

As another example, the target speed may exhibit a decreasing direction at 120 rpm, 100 rpm, 80 rpm, 60 rpm, 40 rpm during the conversion step S50. In this case, the alternate angles can be reduced in order of 360 °, 300 °, 270 °, 120 °, and 60 °.

In the converting step S50, the target speed is also changed when the rotation direction of the motor 130 is changed. When the rotation direction of the rotor 130b is changed during the conversion step S50, the control unit 220 also changes the drive current. When the rotor 130b rotates in one direction and reaches an alternate angle, the controller 220 instructs the inverter 210 to change the current application direction and the drive current. The control unit 220 instructs the inverter 210 to apply the drive current corresponding to the next target speed.

FIG. 5 represents the conversion step and the main step. 6 is a graph showing the rotational speed and the target speed of the actual motor during the conversion step and the main step. The dotted line in Fig. 6 is the target speed, and the solid line is the actual rotation speed of the motor 130. [

During the conversion step S50, the target speed of the motor 130 linearly increases or decreases. During the conversion step S50, the target speed of the motor 130 may increase linearly. For example, the target speed increases, such as 40 rpm, 60 rpm, 80 rpm, 100 rpm, 120 rpm. As another example, it may decrease linearly. The controlling method of the washing machine according to the embodiment of the present invention includes a main step S30 of keeping the target speed constant, and the converting step S50 includes an initial step of gradually increasing the target speed before the main step S30 (S20); And a later step S40 for gradually reducing the target speed after the main step S30.

The main step S30 may be a step of keeping the drive current constant. The controller 220 can maintain the driving current constant to maintain the target speed of the motor 130 constant. The controller 220 may maintain the driving current within a predetermined range in accordance with the embodiment of the control method in order to maintain the target speed.

The conversion step S50 includes an initial step S20 and a later step S40. In the initial step S20, the target speed may be increased in the order of 40 rpm, 60 rpm, 80 rpm, 100 rpm, and 120 rpm, and alternate angles may be increased to 60, 120, 270, 300 and 360 degrees.

In the later step S40, the target speed may be reduced to 120 rpm, 100 rpm, 80 rpm, 60 rpm, and 40 rpm, and alternate angles may be decreased in the order of 360, 300, 270, 120 and 60 degrees. In the main step S30, the target speed may be 120 rpm and the alternating angle may be maintained at 360 deg.

In the main step S30, the rotation direction is changed when the motor 130 rotates by the alternate angle, and the alternate angle may be constant during the main step S30. In the main step S30, the alternating angle is 360 占 and the target speed may be 120 rpm. The main step S30 can be rotated 360 degrees clockwise and then 360 degrees counterclockwise.

The control method of the washing machine according to the embodiment of the present invention includes a drain step S70 for draining the washing water accommodated in the outer tub 122 when the motor 130 stops after the last step S40. The control unit 220 drives the drain pump to perform the drainage step S70. The control unit 220 terminates the drainage step S70 by terminating the operation of the drainage pump.

The control unit 220 may perform the dehydration step after the drainage step S70. The control unit 220 may perform the watering step S10 again after the drainage step S70. For example, the conversion step S50 may be one of a washing or rinsing step S90. The conversion step S50 may be performed in a state in which the wash water is received in the outer tub 122, and the detergent may not be included in the wash water.

And a bleach injecting step (S60) of injecting the bleaching agent into the inner tank 115 before the draining step (S70) after the completion of the late step (S40). When the drainage step S70 is completed, the motor 130 is rotated at a high speed to perform the dehydration step. After the dehydration step is completed, the washing water may be introduced into the inner tank 115 and then the rinsing step S90 may be performed.

The conversion step S50 includes a plurality of application steps S51 for applying a driving current required for the target speed; And stopping the application of electric current between the plurality of application steps S51 (S53).

The conversion step S50 includes an application step S51 and a dormancy step S53. The applying step S51 is a step in which the inverter 210 applies a driving current to the motor 130. [ The applying step S51 is a step of supplying the motors 130 with differently determined drive currents. The dormant step S53 is a step of not applying a driving current to the motor 130. [ The control unit 220 may alternately perform the application step S51 and the dormancy step S53. The control unit 220 may perform the dormant step S53 after a plurality of application steps S51.

The applying step S51 is divided according to the magnitude of the driving current or the target speed. For example, the target speed may be 40 rpm, 60 rpm, 80 rpm, 100 rpm, 120 rpm. The application step S51 is distinguished according to the target speed.

A method of controlling a washing machine according to an exemplary embodiment of the present invention is a method of controlling a washing machine including an inner bath (115) for accommodating a cloth and a motor (130) for rotating the inner cloth (115) Step S20; A main step (S30) of keeping the alternating angle constant; And a later step S40 for gradually reducing the alternating angle.

The initial step S20 may be a step of increasing the driving current applied to the motor 130 and increasing the alternating angle to change the rotation direction of the motor 130 if it is satisfied. The main step S30 may be a step of keeping the driving current and the alternating angle constant. The later step S40 may be a step of stepwise decreasing the driving current and the alternating angle.

The initial step S20 is a step of increasing the target speed of the motor 130. [ The initial step S20 is a step in which the alternating angular period of the motor 130 is increased. The initial step S20 is performed in a state in which the outer tub 122 receives the washing water. The target speed increases step by step.

The main step S30 is performed after the initial step S20. The main stage is a step of keeping the target speed of the motor 130 constant. The main step S30 is a step of keeping the alternating angular period of the motor 130 constant. The main step S30 is performed in a state in which the outer tub 122 accommodates the washing water.

The later step S40 is performed after the main step S30. The last step S40 is a step of reducing the target speed of the motor 130 constantly. The last step S40 is a step of gradually reducing the alternating angular period of the motor 130. [ The later step S40 is performed in a state in which the outer tub 122 receives the washing water. In the later step S40, the motor 130 can be stopped and terminated.

The control unit 220 can change the alternating angle when changing the application direction of the current. For example, the control unit 220 controls the rotation direction of the motor 130 so that the motor 130 rotates 60 ° clockwise, then rotates 80 ° counterclockwise, and rotates 100 ° clockwise .

As another example, the controller 220 may change the alternate angle when the application direction of the current is restored to the initial state. For example, the control unit 220 rotates the motor 130 by 60 degrees in the clockwise direction, rotates the motor 130 counterclockwise by 60 degrees, rotates the motor 130 by 80 degrees in the clockwise direction, rotates the motor by 80 degrees in the counterclockwise direction The rotation direction of the motor 130 is controlled.

The control unit 220 may change the alternating angle every time the motor 130 is controlled in reverse phase, or may change the alternating angle at the end of one period with two reverse phase control periods. The washing machine according to the embodiment of the present invention includes: an inner tub 115 that accommodates a cloth; An outer tub (122) for receiving the inner tub (115); A motor 130 that generates a rotational force to rotate the inner tub 115; And a controller 220 for increasing or decreasing a driving current applied to the motor 130 so as to increase or decrease the target speed of the motor 130 step by step.

The outer tub 122 receives the washing water and inner tub 115. The outer tub (122) rotatably receives the inner tub (115). A pulsator 116 is disposed at the lower end of the inner tank 115. The motor 130 rotates at least one of the pulsator 116 and the inner tub 115. The pulsator 116 and the inner tub 115 can rotate together or individually. The inverter 210 applies a driving current to the motor 130. The drive current determines the rotation speed of the motor 130. [ The control unit 220 commands the inverter 210 to apply the driving current so that the rotational speed of the motor 130 follows the target speed. The driving current may increase in proportion to the target speed.

For example, the target speed may increase in the order of 40 rpm, 60 rpm, 80 rpm, 100 rpm, and 120 rpm. As another example, the target speed may be reduced to 120 rpm, 100 rpm, 80 rpm, 60 rpm, 40 rpm. The washing machine according to the embodiment of the present invention includes a water supply unit 137 for supplying washing water to the outer tub 122,

 The control unit 220 increases the target speed of the motor 130 stepwise after the water supply unit 137 is driven. The water supply portion 137 includes a water supply valve 135 and a water supply hose 118. The water supply hose 118 can be connected to the outer tank 122. The water supply hose 118 may be connected to the detergent box 134. The wash water discharged from the water supply hose 118 may flow to the outer tank 122 together with the detergent contained in the detergent box 134.

The controller 220 controls the motor 130 to gradually decrease the target speed of the motor 130. The controller 130 controls the motor 130 so that the target speed of the motor 130 is reduced, And then drives the drainage unit 140. The drainage section 140 drains the wash water from the outer tanks 122 (122). The drainage section 140 includes a drainage hose 142 and a drainage pump 144. The control unit 220 drives the drain pump 144. The drain pump 144 discharges the wash water flowing through the drain hose 142 to the outside of the cabinet. The drain pump 144 sucks the wash water accommodated in the outer tub 122.

FIG. 7 shows the target speed and the alternating angle stored in the database.

The washing machine according to the embodiment of the present invention includes a memory 230 for storing an alternating angle which is a period for changing the rotation direction of the motor 130 in accordance with the target speed and the target speed of the inner tank 115.

 The memory 230 is divided into a volatile memory 230 that loses stored information when the power is turned off, and a nonvolatile memory 230 that retains stored information even when the power is turned off. The memory 230 may be divided into a ROM (Read Only Memory) and a RAM (Random Access Memory). Preferably, the memory 230 also maintains the alternating angle and target speed information when the power is turned off. The memory 230 may be a ROM.

The operation of the washing machine and the washing machine according to the present invention will now be described.

The control unit 220 opens the water supply valve and stores the wash water in the outer tub. The inner tub 115 accommodates the bell. The motor 130 rotates the inner tub 115. The control unit 220 gradually increases or decreases the target speed of the motor 130 during the conversion step S50. After the water supplying step, the controller 220 performs the initial step S20.

The initial step S20 increases the target speed and the alternating angle in steps. When the inner tank 115 is rotated at a high speed from the beginning, the bobbin keeps its position due to inertia, and only the inner tank 115 rotates, so that the bunching of the bobbin becomes worse. However, according to the present invention, since the speed of the inner tank 115 increases stepwise, the bag rotates together with the inner tank 115, and the bag is dispersed. Therefore, the center of gravity of the inner tub 115 is as close as possible to the rotational axis of the motor 130. Further, the alternating angle increases stepwise, so that the effect of shaking the bubble occurs. Therefore, the balls are dispersed to each other.

The main step S30 is a period in which the target speed and the alternating angle are kept constant. Substantially rinsing or washing is then carried out. When the predetermined time has elapsed, the control unit 220 performs the later step S40. The latter step S40 is for eliminating bunching of the blanks generated during the main step S30. In the later step S40, the target speed and the alternating angle are changed stepwise in the same manner as the initial step S20. However, the latter step S40 is performed until the driving of the motor 130 is completed, so that the target speed gradually decreases. Also, the alternating angle gradually decreases.

As described above, the rotation angle and the target speed can be increased or decreased step by step to prevent the blooming of the blooms. Also, since the bunching of the cloth is reduced, the vibration and noise during rotation of the inner tub 115 are reduced. In addition, since the center of gravity of the inner tank 115 does not change much, the inner tank 115 is inclined to prevent the inner tank 115 from colliding with the outer tank. Further, stable rotation of the inner tub 115 is possible, so that the maximum rotatable speed of the inner tub 115 increases. Therefore, the dehydration degree increases through the high-speed rotation of the inner tank 115.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

115: My tune 116: Pulsater
118: water supply hose 122: outer tank
130: motor 130a: stator
130b: Rotor 130c: Hall sensor
134: detergent box 135: water valve
137: water supply part 140: drainage part
210: inverter 220:
230: Memory

Claims (15)

A control method for a washing machine comprising an outer tank for receiving laundry, a inner tank rotatably disposed in the outer tank for storing the cloth, and a motor for rotating the inner tank,
A water supply step of supplying wash water to the outer tank; And
And a step of gradually increasing or decreasing a target speed of the motor.
The method according to claim 1,
Wherein,
And changing the rotating direction when the motor rotates by an alternate angle.
3. The method of claim 2,
The alternating angle may be,
Wherein the controller has a directionality that increases or decreases each time the motor changes its direction of rotation.
The method of claim 3,
The target speed has a directionality that increases or decreases,
And the directionality of the target speed is the same as the directionality of the alternating angle.
3. The method of claim 2,
Wherein,
Wherein the target speed is also changed when the rotation direction of the motor is changed.
The method according to claim 1,
Wherein the target speed of the motor in the converting step linearly increases or decreases.
The method according to claim 1,
Further comprising a main step of keeping the target speed constant,
Wherein,
An initial step of gradually increasing the target speed before the main step; And
And a later step of gradually reducing the target speed after the main step.
8. The method of claim 7,
The main step comprises:
Wherein the rotation direction is changed when the motor rotates by an alternate angle, and the alternating angle is constant during the main step.
8. The method of claim 7,
And a drain step of draining the washing water accommodated in the outer tub when the motor stops after the completion of the later step.
The method according to claim 1,
Wherein,
A plurality of application steps for applying a drive current required for the target speed; And
And stopping current application between the plurality of application steps.
1. A control method for a washing machine including an inner tank for accommodating a cloth and a motor for rotating the inner cloth,
An initial step of incrementally increasing the alternating angle;
A main step of keeping the alternating angle constant; And
And a later step of gradually reducing the alternate angle.
Inner shell to accommodate the bubble;
An outer tub for receiving the inner tub;
A motor for generating a rotational force for rotating the inner tub; And
And a controller for increasing or decreasing a target speed of the motor by increasing or decreasing a driving current applied to the motor.
13. The method of claim 12,
And a water supply unit for supplying wash water to the outer tank,
Wherein,
And the target speed of the motor is increased stepwise after completion of driving of the water supply unit.
13. The method of claim 12,
And a drainage unit for draining the washing water accommodated in the outer tub,
Wherein,
Wherein the motor is stopped after the target speed of the motor is gradually decreased to drive the drain portion.
13. The method of claim 12,
Further comprising: a memory for storing an alternating angle which is a period for changing the target speed of the inner tank and the rotational direction of the motor in association with the target speed.

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