KR20110016330A - Controlling method of washing machine - Google Patents

Abstract

PURPOSE: A controlling method of a washing machine is provided to exactly perform a step motion and set a pause maintaining time and generated a maximum impact force to obtain a target washing performance. CONSTITUTION: A controlling method of a washing machine is as follows. A drum is rotates to a first rotation direction according to a first speed with a laundry. To enable the laundry to fall down to a bottom part of a drum, a drum is stopped rapidly. A stop state of a drum is maintained until the laundry drops down to the bottom part of the drum.

Description

Controlling Method of Washing Machine

The present invention relates to a method of controlling a washing machine, and more particularly, to a method of controlling the movement of a drum.

In general, a washing machine is a device for removing dirt from laundry by the action of water and detergent.

The washing machine is largely divided into stirring, vortex and drum washing machines.

The stirring type washes by rotating the laundry rod rising to the left and right in the center of the washing tank, and the vortex type washes by using the friction force between the water flow and the laundry by rotating the disc-shaped rotary blade formed at the lower part of the washing tank to the left and right, and the drum type inside the drum. Add water, detergent and laundry to wash the drum by rotating it.

The drum washing machine is equipped with a tub in which washing water is accommodated in a cabinet forming an exterior, a drum in which laundry is accommodated, and a back of the tub is provided with a motor and a shaft for rotating the drum. .

The drum type laundry machine having the above-described configuration removes dirt contained in the laundry by the frictional force between the wash water and the laundry, the friction between the laundry and the drum, and the chemical action of the detergent.

Therefore, the motion-related conditions of the drum such as the rotational direction and the rotational speed of the drum are closely related to the washing performance of the washing machine. For this reason, in order to improve the overall washing performance, it is required that the combination of the motion conditions of the drum be optimized for each of the detailed washing procedures.

The present invention has been made to solve the above-described problems, an object of the present invention is to provide a control method of a washing apparatus that can improve the washing performance.

In order to achieve the above object, the present invention provides a control method comprising a variety of drum motions that can improve the washing performance. The operating conditions of the drum motions are appropriately set so as to be optimized for the above-described purpose as described in more detail below.

The present invention can improve the washing performance and shorten the washing time by providing various and optimally set drum motion.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Unless otherwise defined, all terms in the specification are the same as the general meaning of the terms understood by those skilled in the art, and if the terms used herein conflict with the general meaning of the terms Is in accordance with the definitions used herein.

On the other hand, the configuration or control method of the device to be described below is not intended to limit the scope of the present invention, but to describe the embodiment of the present invention, the same reference numerals are used throughout the specification the same components Indicates.

1 is a perspective view of a washing machine that is the control object of the washing machine of the present invention.

The washing apparatus includes a cabinet 110 forming an exterior, a tub 120 provided inside the cabinet and supported by the cabinet, a drum 130 rotatably provided inside the tub, and laundry loaded therein. And a motor 140 for rotating the drum by applying torque to the drum, and a control panel 115 for allowing a user to select and execute a washing course.

The cabinet 110 includes a main body 111, a cover 112 provided on the front surface of the main body and coupled to each other, and a top plate 116 coupled to the upper portion of the main body. The cover 112 may include an opening 114 provided to allow access to and from the laundry, and a door 113 to selectively open and close the opening.

The drum 130 forms a space for washing laundry put into the drum 130. The drum 130 is rotated by receiving power from the motor 140. Since the drum 130 includes a plurality of through holes 131, the wash water stored in the tub 120 may be introduced into the drum 130 through the through holes 131, and the washing inside the drum may be performed. Water can flow out of the tub. Therefore, when the drum is rotated, the laundry put into the drum is removed from the dirt during the friction with the wash water stored in the tub.

The control panel 115 is not only a user can input the information related to the washing, but also configured to check the information related to the washing. That is, the configuration for the interface with the user.

Accordingly, the control panel 115 includes manipulation units 117 and 118 through which a user can input a control command, and a display unit 119 displaying control information according to the control command. And the control panel may include a control unit for controlling the driving of the washing machine including the operation of the motor in accordance with the control command.

According to the control method of the washing apparatus of the present invention, the drum can be driven in various forms. That is, drum driving is performed in various forms as well as general tumble driving and spin driving. The tumble drive is a drum drive motion that drops after the laundry is lifted during washing or rinsing of a general drum washing machine, and the spin drive is a drum drive motion in which laundry is continuously rotated while the laundry is stuck inside the drum.

Drum drive motion in the present invention refers to the motion of the laundry flow in the drum associated with this as well as the RPM of the drum rotation. Accordingly, the present invention provides a control method of a motor for generating drum rotation, in particular, rotation of the drum for driving the drum in various drum driving motions.

Hereinafter, various drum driving motions applicable to embodiments of the present invention will be described in detail.

2 is a view showing a variety of drum driving motion utilized in the control method of the present invention laundry machine. 2 shows the motion of the drum and the laundry therein when viewed from the front. In order to better explain the movement of the drum and the laundry, it is set in the rectangular coordinate at the center of rotation of the drum, and as is known, the first to fourth quadrants are set in accordance with the rectangular coordinate.

Drum driving motion means a combination of the rotational direction and the rotational speed of the drum, the laundry located inside the drum by the drum driving motion is different in the falling direction, the dropping time and therefore the flow of the laundry in the drum is different You lose. The drum driving motion is implemented by controlling the motor.

Since the laundry is raised by the friction force on the lift 135 and / or the drum inner surface provided on the drum inner circumferential surface when the drum rotates, the impact applied to the laundry can be changed by controlling the rotation speed and the rotation direction of the drum. Will be. That is, the mechanical forces such as friction between laundry, friction between laundry and washing water, and dropping impact of laundry can be changed. In other words, it is possible to vary the degree of tapping or rubbing the laundry for washing, it is possible to vary the degree of dispersion or flipping of the laundry.

Accordingly, the present invention provides a control method of a laundry machine equipped with various drum driving motion to vary the drum driving motion according to the three steps of the type of laundry, the degree of contamination of the laundry, each stroke, each stroke It is possible to process the laundry with the optimum mechanical power. This can improve the washing efficiency of the laundry. In addition, due to the consistent drum drive motion it can prevent excessive washing time to reduce the time required.

On the other hand, in order to implement such various drum driving motion, the motor 140 is preferably a direct type motor. That is, the stator of the motor is preferably a tub 120 is fixed to the rear, the rotor of the motor is rotated to drive the drum 130 directly. This is because by controlling the rotation direction, torque, etc. of the motor, it is possible to immediately control the drum drive motion by preventing the time delay or backlash (maximum).

On the other hand, in the form of transmitting the rotational force of the motor to the rotating shaft through the pulley or the like, a drum driving motion in which a time delay or backlash is allowed, for example, a tumbling drive or a spin drive may be possible. Therefore, it is not desirable to implement various drum driving motions. The type of driving method of the motor and the drum is obvious to those skilled in the art, so detailed description thereof will be omitted.

2 (a) is a diagram showing a rolling motion (rolling motion). The rolling motion is a motion in which the motor 140 rotates the drum 130 in one direction, and the laundry on the inner circumferential surface of the drum drops to the lowest point of the drum at a position less than about 90 degrees in the drum's rotation direction.

That is, when the motor 140 rotates the drum at about 40 RPM, the laundry located at the lowest point of the drum 130 rises a predetermined height along the rotational direction of the drum 130 and is less than about 90 degrees in the rotational direction at the lowest point of the drum. As it rolls in position, it flows to the lowest point of the drum. Visually, when the drum rotates clockwise, the laundry continues to roll in three quadrants of the drum.

The laundry is washed through the rolling motion through friction with the wash water, friction between the laundry, and friction with the drum inner circumferential surface. And through this motion, the laundry is turned upside down enough to obtain the effect of gently scrubbing the laundry.

Here, the drum RPM is determined in relation to the radius of the drum. That is, as the RPM of the drum increases, centrifugal force is generated on the laundry in the drum. Due to the difference in size between the centrifugal force and gravity, the flow of laundry in the drum is changed. Of course, the rotational force of the drum and the friction between the drum and the laundry should also be considered.

Therefore, in the rolling motion, the RPM of the drum is determined so that the centrifugal force and the friction force are less than the gravity 1G.

FIG. 2B is a diagram showing tumbling motion.

The tumbling motion is a motion in which the motor 140 rotates the drum 130 in one direction, but the laundry on the inner circumferential surface of the drum falls to the lowest point of the drum at a position of about 90 to 110 degrees of rotation of the drum. The tumbling motion is a drum driving motion that is generally used during washing and rinsing because mechanical force is generated only by controlling the drum to rotate in one direction at an appropriate RPM.

That is, the laundry put into the drum 130 is located at the lowest point of the drum 130 before the motor 140 is driven. When the motor 140 provides torque to the drum 130, the drum 130 rotates, and the lift 135 provided on the inner circumferential surface of the drum moves laundry from the lowest point in the drum to a predetermined height. . If the motor 140 rotates the drum 130 to about 46 RPM, the laundry drops to the lowest point of the drum at a position of about 90 to 110 degrees in the rotational direction at the lowest point of the drum.

The tumbling motion generates a greater centrifugal force than the centrifugal force in the rolling motion, but the RPM of the drum is determined to generate less than the gravity.

Visually, tumbling motion is a form in which the drum moves from the third quadrant to a part of the second quadrant at the lowest point of the drum when it is rotated clockwise and then falls off the drum's inner peripheral surface to the lowest point of the drum.

Therefore, the tumbling motion uses the impact force caused by the friction and the fall with the wash water, thereby generating a sufficient washing force by using the effect of tapping the laundry lightly by the impact. And, because the motion to fall off the drum to some extent it is effective to separate the tangled laundry and to disperse the laundry.

2 (c) is a diagram showing step motion. The step motion is a motion in which the motor 140 rotates the drum 130 in one direction, but the laundry on the inner circumferential surface of the drum drops from the highest point in the drum's rotational direction (a position of about 180 degrees) to the lowest point of the drum.

When the motor 140 rotates the drum 130 to about 60 RPM or more, the laundry can be rotated without falling by centrifugal force. The step motion is performed at a speed such that the laundry does not fall from the drum inner circumferential surface by the centrifugal force. After the drum is rotated, the drum is braked to maximize the impact force on the laundry.

In the step motion, the motor 140 rotates the drum at a speed at which the laundry does not fall from the outer circumferential surface of the drum by centrifugal force (about 60 RPM or more), and the laundry is located near the highest point of the drum (180 degrees in the rotational direction). The reverse torque is controlled to supply the drum 130.

Therefore, the laundry rises in the rotational direction of the drum at the lowest point of the drum 130 and then drops from the highest point of the drum 130 to the lowest point when the drum is stopped by the reverse torque of the motor 140. For this reason, in addition to the frictional force that is given, the step motion uses the impact force induced in the process of the laundry falling inside the drum to the maximum free fall, thereby strongly tapping the laundry. By this maximum impact force, the mechanical force generated by the step motion, i.e., the washing ability, becomes larger than the rolling motion or tumbling motion described above as well as other motions described below.

Visually, the step motion is a form in which the drum moves clockwise from the lowest point of the drum to the highest point of the drum after passing from the third quadrant to the highest point of the drum and then suddenly falls off the inner peripheral surface of the drum to the lowest point of the drum. Therefore, since the distance falling in the drum in the step motion is the largest, it is possible to more effectively provide a mechanical force when the amount of small amount.

On the other hand, the motor 140 is preferably reversed braking for braking the drum. Reverse braking is a method of braking the motor by generating a rotational force in a direction opposite to the direction in which the motor is rotating. The phase of the current supplied to the motor can be reversed to induce a rotation force opposite to the direction in which the motor is rotating, and the reverse phase braking enables rapid braking of the motor. Accordingly, the reversed braking is the most suitable braking method for the step motion which gives a strong impact on the laundry.

Thereafter, the motor 140 applies torque to the drum 130 again to raise the laundry at the lowest point of the drum to the highest point. That is, after the torque is applied to rotate clockwise, the torque is momentarily stopped by applying the torque to rotate in the counterclockwise direction, and then the step motion is implemented by applying the torque to rotate clockwise again.

As a result, the step motion is a motion of washing the laundry and the laundry introduced into the through-hole 131 during the rotation of the drum, and washing the laundry by the impact force when the laundry is located at the top of the drum.

Figure 2 (d) is a view showing a swing motion (swing motion). The swing motion is a motion in which the motor 140 rotates the drum 130 in both directions, so that laundry is dropped at a position less than about 90 degrees in the rotation direction of the drum.

That is, when the motor 140 rotates the drum 130 counterclockwise to about 40 RPM, the laundry located at the lowest point of the drum 130 rises a predetermined height counterclockwise. At this time, the motor stops the rotation of the drum before the laundry reaches a position of about 90 degrees counterclockwise of the drum so that the laundry falls to the lowest point of the drum at a position less than about 90 degrees counterclockwise of the drum.

Thereafter, the motor 140 rotates the drum 130 clockwise to about 40 RPM so that the falling laundry rises a predetermined height clockwise along the rotational direction of the drum. On the other hand, the motor 140 stops the rotation of the drum before the laundry reaches the position of the drum clockwise of about 90 degrees so that the laundry drops to the lowest point of the drum at a position less than about 90 degrees clockwise of the drum.

In other words, swing motion is a motion in which the drum rotates in one direction and stops and the rotation and stops in reverse direction. Visually, the laundry rises from the three quadrants of the drum to a portion of the second quadrant and then falls gently. It can be said to be a form that repeatedly rises up and falls smoothly.

At this time, the braking of the motor 140 can minimize the load generated on the motor 140 by using the power generation braking, minimize the mechanical wear of the motor 140, and at the same time can control the impact applied to the laundry.

The power generation braking is a braking method in which the motor acts as a generator by rotational inertia when the current applied to the motor is turned off. When the current applied to the motor is turned off, the direction of the current flowing through the coil of the motor is opposite to the direction of the current before the power is turned off. Therefore, a force (Fleming's right hand law) acts in a direction that hinders the rotation of the motor, thereby braking the motor. The power generation braking, unlike the reverse braking, does not brake the motor smoothly but smoothly changes the rotational direction of the drum.

Thus, visually, the swing motion is a form in which the laundry flows in the form of eight characters lying sideways over the third and fourth quadrants of the drum.

As a result, the swing motion generates smooth rotation and fall of the laundry. Thus, SwingMotion gently washes the laundry in the wash water as a whole, and washes the laundry using the friction force generated for the shaking. For this reason, the swing motion has a low washing ability compared to other motions, but can wash the weak and delicate clothes without deformation.

Figure 2 (e) is a view showing a scrub motion (scrub motion). The scrub motion is a motion in which the motor 140 rotates the drum 130 in both directions, and the laundry is dropped at a position of about 90 degrees or more in the rotation direction of the drum.

That is, when the motor 140 rotates the drum 130 counterclockwise to about 60 RPM or more, the laundry located at the lowest point of the drum 130 rises a predetermined height counterclockwise. At this time, the motor is to stop the rotation of the drum by providing a reverse torque to the drum after the laundry has passed the counterclockwise position of about 90 degrees. Then, the laundry on the inner circumferential surface of the drum drops rapidly.

Thereafter, the motor 140 rotates the drum clockwise at about 60 RPM to raise the dropped laundry a predetermined height clockwise. The motor 140 stops rotation of the drum by providing reverse torque to the drum 130 when the laundry passes through the clockwise 90 degree position of the drum. Therefore, the laundry on the inner circumferential surface of the drum falls to the lowest point of the drum at a position 90 degrees or more clockwise of the drum.

Thus, the scrub motion is to wash the laundry by dropping the laundry sharply at a predetermined height. On the other hand, the motor 140 is preferably reversed braking for braking the drum.

Since the direction of rotation of the drum is sharply switched, the laundry does not deviate greatly from the inner circumferential surface of the drum, thereby maximizing friction between the laundry, friction between the laundry and the wash water, and friction between the laundry and the drum inner surface. Thus, the scrub motion can achieve a very powerful rubbing effect, which is larger than the rolling motion described above. The scrub motion is a form in which the laundry moved to the part of the second quadrant after the third quadrant drops sharply and moves again to the part of the first quadrant after the fourth quadrant. Therefore, it can be said that the laundry which rises visually descends along the inner peripheral surface of a drum.

Figure 2 (f) is a view showing the filtration motion (filtration motion). The filtration motion is a motion in which the motor 140 rotates the drum 130 so that the laundry does not fall from the inner circumferential surface of the drum by centrifugal force, and sprays the washing water into the drum.

That is, the filtration motion is in close contact with the inner circumferential surface of the drum after the laundry is unfolded, so that the washing water is sprayed into the drum while the washing water is rotated by the centrifugal force to the tub 120 through the laundry, the through hole 131 of the drum. Get out. Therefore, the filtration motion expands the surface area of the laundry while allowing the washing water to penetrate the laundry, thereby obtaining the effect of supplying the washing water evenly to the laundry.

2 (g) is a diagram showing a squeeze motion. The squeeze motion repeats the operation of separating the laundry from the inner peripheral surface of the drum by lowering the rotational speed of the drum 130 after rotating the drum 130 so that the laundry does not fall from the inner peripheral surface of the drum by centrifugal force The motion of spraying the washing water into the drum during the rotation of the drum.

In other words, the filtration motion is continuously rotated at a speed at which the laundry does not fall from the inner circumferential surface of the drum, but the squeeze motion changes the rotation speed of the drum to repeat the washing and close contact with the inner circumferential surface of the drum 130. There is.

The process of spraying the washing water into the drum 130 during the filtration motion and the squeeze motion may be implemented as a circulation passage and a pump although not shown in FIG. 1. The pump communicates with the bottom of the tub 120 to pressurize the washing water, and the circulation passage may be provided so that one side is connected to the pump and the other side may spray the washing water from the top of the drum into the drum. .

However, since the above-described circulation flow path and the pump are necessary to inject the laundry water stored in the tub, it is not necessary to exclude the case of spraying the washing water into the drum through the injection water supply flow path connected to the water supply source outside the cabinet. no.

That is, if the injection water supply passage has one side connected to the water supply source, the other side is connected to the tub, but provided with a nozzle for injecting the washing water into the drum, washing water into the drum of the filtration and squeeze motion Will be able to spray.

As described above, the step motion and scrub motion have a higher washing capacity than other drum motions. Therefore, these step and scrub motions will be described in more detail with reference to FIGS. 3 and 4 as follows.

3 shows the step motion in more detail.

First, as shown in FIG. 2 (c), the laundry starts from the lowest point of the drum 130 and moves to the highest point of the drum 130 as shown in FIGS. 3 (a)-(c). That is, referring to the tub 120 adjacent to the drum 130 and in a stationary state, the laundry in the drum 130 is the highest point of the tub 120 at a position adjacent to the lowest point of the tub 120. Is moved to a position adjacent to. For the movement of the laundry, the motor 140 applies a rotational force, i.e., torque, to the drum 130 in a predetermined direction and clockwise in the drawing, and thus the drum 130 is rotated together with the laundry in a predetermined direction. Raise the laundry. The laundry is in close contact with the inner surface of the drum 130 by friction with the inner surface of the lifter and the drum 130, and may rotate together with the drum 130. In addition, the laundry should be raised to the highest point of the drum 130 without being separated from the drum 130. Thus, the drum 130 is rotated above about 60 RPM and this rotational speed generates sufficient centrifugal force such that the laundry does not separate from the drum 130 to the highest point of the drum 130. Here, the rotational speed of the drum may be changed so that the centrifugal force may be greater than gravity in consideration of the size of the drum such as the inner diameter of the drum. As a result, the laundry is the highest point of the drum 130 (ie, the highest point of the adjacent tub 120) from the lowest point of the drum 130 (ie, a position on the inner surface of the drum adjacent to the lowest point of the adjacent tub 120, hereinafter “position 1”). Rotates with the drum to a position on the inner surface of the drum adjacent to it, hereafter " position 2 ".

Thereafter, the laundry drops from the highest point (position 2) of the drum 130 to the lowest point (position 1). For this fall of the laundry, when the laundry reaches the peak of the drum 130 or just before reaching it, the drum 130 is suddenly stopped. More specifically, reverse torque is provided to the drum 130 from the motor 140 so that the drum 130 is suddenly stopped. The reverse torque is generated by reverse phase braking which supplies a reverse phase current to the motor 140 as previously described with reference to FIG. 2 (c). In this case, the reverse phase braking means applying a reverse phase current so that the drum rotates in the opposite direction. For example, as shown in the figure, the current is applied to the motor to rotate in a clockwise direction after the current is applied to rotate in a clockwise direction. Since the inverse braking timing of the motor 140 is closely related to the position of the laundry in the drum 130, a device capable of determining or predicting the position of the laundry is preferably provided, and a hole capable of determining the rotation angle of the rotor. An example is a sensing device having a Hall effect sensor. Through the Hall sensor, the controller may determine the rotation direction as well as the rotation angle of the rotor. Details thereof will be apparent to those skilled in the art, and thus a detailed description thereof will be omitted. The control unit may determine the rotation angle of the drum through the sensing device, and controls the motor 140 to reverse brake before the rotation of the drum reaches or reaches 180 degrees. Therefore, the drum 130, which was rotated clockwise, is momentarily stopped by receiving a rotational force in the counterclockwise direction, and the centrifugal force acting on the laundry is removed. Therefore, the laundry falls to the lowest point (position 1) of the drum 130.

Thereafter, as shown in (d) of FIG. 3, the drum 130 continues to rotate clockwise, and the rotation and falling of the laundry as described above are repeated. 3 illustrates a case in which the drum rotates in a clockwise direction, step motion may be performed during rotation in a counterclockwise direction. However, since the step motion generates a high load on the motor 140, the step motion is preferably lowered.

The running rate is the ratio of the driving time of the motor to the sum of the driving time and the stopping time of the motor 140, and the running rate 1 means that the motor is driven without the stopping time. In the case of the step motion, it is preferable that the control rate is about 70% when considering the load of the motor. For example, the step motion may be stopped for 4 seconds after driving for 10 seconds.

On the other hand, if the laundry falls and reaches the lowest point (position 1) of the drum 130, that is, the drum 130 may start to rotate to perform the next step motion while the laundry falls. In this case, after the drum 130 is rotated to some extent, the laundry reaches the lowest point (position 1) of the drum 130, and from this point, the laundry is rotated together with the drum 130. Thus, as the drum 130 is set, even if it is rotated 180 degrees, the laundry cannot be rotated 180 degrees, i.e., the highest point (position 2) of the drum 130, and can also be dropped from the highest point to obtain the desired washing performance. none.

For this reason, after the laundry reaches the lowest point (position 1) of the drum 130, the drum 130 is again controlled to rotate as shown in FIG. 3 (d). That is, the drum 130 is controlled to remain stationary until the laundry reaches the lowest point (position 1) of the drum 130. More specifically, since the drum 130 is stopped at the time when the actual laundry starts to fall, the drum 130 stops from the dropping point until the lowest point of the laundry is reached so that no rotation occurs. Keep it. The stop holding time of the drum 130 is set larger than the time required for the laundry to fall from the highest point (position 2) to the lowest point (position 1) of the drum. Therefore, the stop holding time is set at least 0.4 seconds, preferably may be set to 0.6 seconds to ensure some sufficient stop time.

Due to this setting of the holding time, the step motion can be performed accurately to generate the maximum impact force, and thus the intended washing performance can be obtained.

4 is a view showing scrub motion in more detail.

First, as shown in FIG. 2 (e), the laundry starts from the lowest point of the drum 130 and is 90 degrees or more in the clockwise direction of the drum 130 as shown in (a)-(c) of FIG. 4. Is moved to the point rotated. That is, referring to the tub 120 adjacent to the drum 130 and in a stationary state, the laundry in the drum 130 is located at a position (position 1) on the inner surface of the drum adjacent to the lowest point of the tub 120. The tub 120 is moved to a position (position 2) of the drum inner surface rotated more than 90 degrees in the clockwise direction. For the movement of the laundry, the motor 140 applies a rotational force, i.e., torque, to the drum 130 in a predetermined direction and clockwise in the drawing, and thus the drum 130 is rotated together with the laundry in a clockwise direction. Raise the laundry. The laundry is in close contact with the inner surface of the drum 130 by friction with the inner surface of the lifter and the drum 130, and may rotate together with the drum 130. In addition, the laundry should be raised to a position (position 3) of 90 degrees or more of the drum 130 without being separated from the drum 130. Therefore, the drum 130 is rotated by more than about 60 RPM and this rotational speed is not separated from the drum 130 to the position (position 3) where the laundry is rotated more than 90 degrees from the lowest point of the drum 130 Generate sufficient centrifugal force. Here, the rotational speed of the drum may be changed so that the centrifugal force may be greater than gravity in consideration of the size of the drum such as the inner diameter of the drum. As a result, the laundry is rotated with the drum from the lowest point (position 1) of the drum 130 to a position (position 3) rotated at least 90 degrees from the lowest point of the drum 130.

Thereafter, the laundry falls from the position (position 3) rotated more than 90 degrees to the lowest point (position 1). For this fall of the laundry, when the laundry reaches the position rotated by more than 90 degrees, the drum 130 is suddenly stopped. More specifically, reverse torque is provided from the motor 140 to the drum 130 so that the drum 130 is suddenly stopped. The reverse torque is generated by reverse phase braking which supplies a reverse phase current to the motor 140 as previously described with reference to FIG. 2 (e). In this case, the reverse phase braking means applying a reverse phase current so that the drum rotates in the opposite direction. For example, as shown in the figure, the current is applied to the motor to rotate in a clockwise direction after the current is applied to rotate in a clockwise direction. Since the inverse braking timing of the motor 140 is closely related to the position of the laundry in the drum 130, a device capable of determining or predicting the position of the laundry is preferably provided, and a hole capable of determining the rotation angle of the rotor. An example is a sensing device having a Hall effect sensor. Through the Hall sensor, the controller may determine the rotation direction as well as the rotation angle of the rotor. Details thereof will be apparent to those skilled in the art, and thus a detailed description thereof will be omitted. The control unit may determine the rotation angle of the drum through the sensing device, and controls the motor 140 to reverse brake when the drum is rotated 90 degrees or more. Therefore, the drum 130, which was rotated clockwise, is momentarily stopped by receiving a rotational force in the counterclockwise direction, and the centrifugal force acting on the laundry is removed. In addition, the laundry does not fall vertically as shown in FIG. 4C due to the counterclockwise rotational force, but instead the drum 130 is biased or inclined toward the inner circumferential surface of the drum 130. To the lowest point (position 1). Due to this deflected drop, the laundry greatly rubs against the inner surface of the drum during the fall, and at the same time, the friction between the laundry and the friction between the laundry and the wash water become large.

Thereafter, as shown in FIG. 4 (d), the drum 130 continues to rotate counterclockwise, and as shown in FIGS. 3 (e) and 3 (f), as described above. The rotation and falling of the laundry are repeated. 4 illustrates a case in which the drum rotates clockwise first, but counterclockwise rotation may be performed first. As described above, the scrub motion generates a high load on the motor 140 as in the step motion, and thus is preferably executed by lowering the running rate. The scrub motion is stopped at 4% after performing the scrub motion for 10 seconds to 70% running rate. One example is controlled.

On the other hand, if the laundry falls and reaches the lowest point (position 1) of the drum 130, that is, the drum 130 may start to rotate to perform the next scrub motion while the laundry falls. In this case, after the drum 130 is rotated to some extent, the laundry reaches the lowest point (position 1) of the drum 130, and from this point, the laundry is rotated together with the drum 130. Therefore, as the drum 130 is set, even if the rotation is more than 90 degrees laundry can not be rotated to more than 90 degrees, washing performance by the desired scrub motion is not obtained.

For this reason, after the laundry reaches the lowest point (position 1) of the drum 130, the drum 130 is again controlled to rotate as shown in FIG. 4 (d). That is, the drum 130 is controlled to remain stationary until the laundry reaches the lowest point (position 1) of the drum 130. More specifically, since the drum 130 is stopped at the time when the actual laundry starts to fall, the drum 130 stops from the dropping point until the lowest point of the laundry is reached so that no rotation occurs. Keep it. The stopping time of the drum 130 is set larger than the time required for the laundry to fall from the point (position 3) rotated by 90 degrees or more to the lowest point (position 1). Since the drop height of the scrub motion is smaller than the step motion, the stop holding time of the scrum motion is set to 0.2 seconds less than the stop holding time of the step motion.

Due to the setting of the stopping time, the scrub motion can be performed accurately to generate the maximum friction between the drum surface and the laundry, the friction between the laundry, and the laundry and the wash water so that the intended washing performance is Can be obtained.

FIG. 5 is a graph comparing the cleaning force and the degree of vibration of each motion disclosed in FIG. 2. The horizontal axis is an axis for washing power, and the left side is easy to separate the dirt contained in the laundry, while the left side is easy to wash sensitive clothing that is easy to be damaged. On the other hand, the vertical axis is the axis indicating the vibration or noise level as the vibration level increases toward the top, but the washing time for the same laundry is reduced. On the other hand, the lower the vertical axis, the lower the vibration level, but the washing time increases.

The step motion and scrub motion is a motion suitable for the washing course to reduce the washing time when the contamination of the laundry is severe and excellent washing power. In addition, the step motion and scrub motion is a motion with a high level of vibration and noise. Therefore, when the laundry is sensitive clothing or the washing course that needs to minimize noise and vibration is an undesirable motion.

The rolling motion is a motion characterized by excellent washing power and low vibration level, minimizing laundry damage and low motor load. Therefore, it can be applied to all washing courses, but it is a motion suitable for the initial washing detergent dissolution and washing wet.

The tumbling motion has a lower washing force than the scrub motion but the vibration level is a motion between the scrub motion and the rolling motion. Since the rolling motion takes longer washing time than the tumbling motion instead of low vibration level, the tumbling motion is applicable to all washing courses but is a useful motion especially for the step for podis dispersion.

The squeeze motion is similar to the tumbling motion in terms of the fine force, and the vibration level is higher than the tumbling motion. The squeeze motion is a useful motion for the step of rinsing because the washing water is discharged to the outside of the drum in the process of repeating the contact and separation of the laundry on the inner peripheral surface of the drum.

The filtration motion has a lower cleaning force than the squeeze motion, and the noise level is similar to that of the rolling motion. The filtration motion is a motion that is useful for the step where the washing water is discharged to the outside of the drum through the laundry in a state in which the laundry is in close contact with the inner peripheral surface of the drum.

The swing motion is the motion with the lowest vibration level and washing power. Therefore, swing motion is a motion that is useful for low noise or low vibration washing courses and is suitable for washing sensitive clothes.

As mentioned above, each drum drive motion has advantages and disadvantages. Therefore, in consideration of these advantages and disadvantages, it would be desirable to use various drum driving motions appropriately. And each drum drive motion will have advantages and disadvantages in relation to the quantity. Therefore, even in the same course, the same stroke, etc., it would be desirable to use various drum driving motions appropriately in relation to the amount of load.

1 is a perspective view of a washing apparatus according to the present invention.

2 is a view showing a drum motion applied to the control method of the laundry machine according to the present invention.

3 is a detailed view of the step motion.

4 is a detailed view of the scrub motion.

5 is a graph comparing the washing power and vibration level of each motion.

Claims (11)

Rotating the drum containing the laundry together with the laundry in a first rotational direction at a first speed; Stopping the drum rapidly so that the laundry falls to the bottom of the drum; And maintaining the drum in a stationary state until the laundry reaches the bottom of the drum. The method of claim 1, The first speed is a control method of the washing apparatus, characterized in that 60 RPM. The method of claim 1, The stopping step is a control method of a washing apparatus, characterized in that the step of providing a reverse torque to the drum. The method of claim 3, wherein And providing the reverse torque comprises supplying reverse current to the motor to rotate the drum in a second direction opposite to the first direction. The method of claim 1, In the stop maintaining step, the drum is stopped for a larger period of time than the time required for the laundry to fall to its bottom. The method of claim 1, The rotating step is a control method of a laundry machine, characterized in that consisting of a first rotating step for rotating the drum and the laundry to about 180 degrees. The method of claim 6, And repeating the first rotating step, the stopping step, and the stopping holding step for a predetermined time after the stopping holding step. The method of claim 6, And said stop state is maintained for at least 0.4 seconds. The method of claim 1, The rotating step is a control method of a laundry machine, characterized in that consisting of a second rotating step of rotating the drum and laundry by more than 90 degrees. The method of claim 9, After the stop maintaining step, the washing machine further comprises a third rotating step for rotating the drum and the laundry in a second direction opposite to the first direction by more than 90 degrees and the stop step and the stop holding step Way. The method of claim 9, And said stationary state is maintained for at least 0.2 seconds.

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