KR101632210B1 - Controlling Method of Washing Machine - Google Patents

Abstract

The present invention relates to a control method of a washing machine. The present invention provides a control method of a washing machine which is convenient to use by various drum driving motions and can satisfy various consumer needs.

Washing machine, drum motion

Description

[0001] The present invention relates to a control method of a washing machine,

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

Generally, a washing device is a device for removing dirt buried in laundry through the action of water and a detergent.

The washing machine is roughly classified into a stirring type, a vortex type and a drum type washing machine.

In the agitation type, the washing rods rising in the center of the washing tub are washed by rotating the washing rods to the left and right, and the swirl type washing is performed by using the frictional force between the water and the laundry to rotate the disk- Put the water, detergent and laundry in the drum and wash it.

The drum type washing machine includes a tub having an inside of a cabinet forming an outer appearance, a tub accommodating washing water, a drum accommodating the laundry in the tub, and a motor and a shaft for rotating the drum are provided on a rear surface of the tub .

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

Therefore, the conditions related to the motion of the drum, such as the rotational direction and 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-related conditions of the drum is optimized for each detailed washing process.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control method of a washing machine capable of improving washing performance.

In order to achieve the above object, the present invention provides a control method including various drum motions capable of improving washing performance. The operating conditions of the drum motions are appropriately set to be optimized for the purpose described above as will be described in more detail below.

The present invention improves the washing performance and shortens the washing time by providing various and optimized drum motions.

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

Unless defined otherwise, all terms herein are the same as the general meaning of the term as understood by one of ordinary skill in the art to which this invention belongs, and if the terms used herein conflict with the general meaning of the term Are as defined herein.

It is to be understood that the present invention is not limited to the details of the embodiments described below, .

1 is a perspective view of a washing machine to be controlled by the washing machine of the present invention.

The washing machine includes a cabinet 110 forming an outer appearance, a tub 120 provided in the cabinet and supported by the cabinet, a drum 130 rotatably installed in the tub and into which laundry is introduced, A motor 140 for applying a torque to the drum to rotate the drum, and a control panel 115 allowing a user to select and execute a washing course.

The cabinet 110 includes a main body 111, a cover 112 attached to a front surface of the main body, and a top plate 116 coupled to an upper portion of the main body. The cover 112 may include an opening 114 that allows the laundry to enter and exit, and a door 113 that selectively opens and closes the opening.

The drum 130 forms a space for washing the laundry. The drum 130 is rotated by receiving power from the motor 140. Since the drum 130 has a plurality of through holes 131, the washing water stored in the tub 120 can be introduced into the drum 130 through the through holes 131, The number can be leaked to the turbine. Therefore, when the drum rotates, the laundry introduced into the drum is removed from the washing water in the process of rubbing against the washing water stored in the tub.

The control panel 115 is a configuration that allows a user to input information related to washing, as well as to confirm information relating to washing. That is, it is a configuration for interfacing with a user.

Accordingly, the control panel 115 includes an operation unit 117 and 118 for allowing a user to input a control command, and a display unit 119 for displaying control information according to the control command. The control panel may include a controller for controlling the operation of the washing machine including the operation of the motor according to the control command.

According to the control method of the washing machine 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 driving is a drum driving motion in which a laundry is lifted after the laundry is rinsed or rinsed in a general drum washing machine, and the spin driving is a drum driving motion in which the laundry continues to rotate while being attached to the inside of the drum.

The drum driving motion in the present invention means the RPM in which the drum rotates, as well as the motion in which the laundry flows in the drum. Accordingly, the present invention provides a method of controlling a motor that rotates a drum for driving a drum in various drum driving motions, and more particularly, a drum rotates.

Hereinafter, various drum driving motions that can be applied to the embodiment of the present invention will be described in detail.

2 is a view showing various drum driving motions used in a control method of the washing apparatus of the present invention. Figure 2 shows the movement of the drum and the laundry therein when viewed from the front of the drum. In order to better explain the motion of such drums and laundry, the center of rotation of the drum is set at the Cartesian coordinates, and as known, the Cartesian quadrant is set according to the Cartesian coordinates.

The drum driving motion means a combination of the rotating direction and the rotating speed of the drum. The laundry moving in the drum moves in the falling direction and the falling time point of the drum, and therefore the flow of the laundry in the drum is different . The drum driving motion is implemented by controlling the motor.

The laundry is raised by the frictional force against the lift 135 and / or the inner surface of the drum when the drum rotates. Therefore, by controlling the rotation speed and the rotating direction of the drum, . That is, friction between laundry, friction between laundry and washing water, and dropping impact of laundry can be different. In other words, the laundry can be knocked or rubbed for washing, and the laundry can be dispersed or turned upside down at different degrees.

Accordingly, the present invention provides a control method of a washing machine having various drum driving motions, and it is possible to provide a washing machine with various drum driving motions by varying drum driving motions according to types of laundry, degree of contamination of laundry, respective steps, The laundry can be treated with the optimum mechanical force. This makes it possible to improve the washing efficiency of the laundry. In addition, it is possible to prevent an excessive washing time from being consumed due to the consistent drum driving motion, thereby reducing the time required.

Meanwhile, in order to realize the various drum driving motions, the motor 140 is preferably a direct drive type motor. That is, it is preferable that the stator of the motor is fixed to the rear of the tub 120 and the rotor of the motor rotates to drive the drum 130 directly. This is because, by controlling the rotation direction, the torque, and the like of the motor, it is possible to instantaneously control the drum driving motion by preventing time delay or backlash as much as possible.

On the other hand, in the case of transmitting the rotational force of the motor to the rotating shaft through a pulley or the like, drum driving motions in which time delay or backlash is allowed, for example, tumbling driving or spinning driving, etc., will be possible. Therefore, it becomes undesirable to realize various drum driving motions. The driving mode of the motor and the drum is obvious to those skilled in the art and thus a detailed description thereof will be omitted.

Fig. 2 (a) is a view showing a 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 is controlled to drop to a lowest point of the drum at a position less than about 90 degrees in the rotational direction of the drum.

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 rotating direction of the drum 130, So as to roll to the lowest point of the drum. Visually, when the drum rotates clockwise, the laundry continuously rolls in the third quadrant of the drum.

The laundry is washed through the rolling motion by friction with the washing water, friction between the laundry, and friction with the inner surface of the drum. In addition, the sweeping of the laundry is sufficiently generated through the motion, so that the laundry can be smoothly rubbed.

Here, the drum RPM is determined in relation to the radius of the drum. That is, as the RPM of the drum becomes larger, centrifugal force is generated in the laundry in the drum. The flow of the laundry in the drum changes due to the difference in magnitude between the centrifugal force and the gravity. Of course, the rotational force of the drum and the friction between the drum and the laundry must also be considered.

Therefore, the RPM of the drum is determined so that the centrifugal force and the frictional force are less than the gravitational force (1G).

Figure 2 (b) shows a tumbling motion.

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

That is, the laundry loaded in the drum 130 is positioned at the lowest point of the drum 130 before the motor 140 is driven. When the motor 140 provides a torque to the drum 130, the drum 130 rotates, and the lift 135 provided on the inner circumferential surface of the drum moves the laundry to a predetermined height from the lowest point in the drum . If the motor 140 rotates the drum 130 by about 46 RPM, the laundry falls in the direction of the lowest point of the drum at a rotation angle of about 90 to 110 degrees from the lowest point of the drum.

The tumbling motion determines the RPM of the drum so that centrifugal force is generated rather than centrifugal force in rolling motion, but less than gravity.

Visually, the tumbling motion is such that when the drum rotates clockwise, it moves from the third quadrant to the second quadrant at the lowest point of the drum, then falls off the inner periphery of the drum and falls to the lowest point of the drum.

Therefore, the tumbling motion utilizes the impact force caused by the friction with the wash water and the falling of the wash water, thereby generating sufficient washing power by utilizing the effect of tapping the laundry lightly by the impact. In addition, since it is a motion to fall to some extent from the inside of the drum, there is an effect of separating the entangled laundry and dispersing the laundry.

Fig. 2 (c) is a view showing a step motion. The step motion is a motion in which the motor 140 rotates the drum 130 in one direction so that the laundry on the inner circumferential surface of the drum falls down to the lowest point of the drum at the highest rotational point of the drum (about 180 degrees).

When the motor 140 rotates the drum 130 by about 60 RPM or more, the laundry can be rotated without falling due to the centrifugal force. In the step motion, the laundry is rotated at a speed at which the laundry does not fall off the inner peripheral surface of the drum due to the centrifugal force. The drum is rotated, and then the drum is rapidly braked to maximize the impact force on the laundry.

In the step motion, the motor 140 rotates the drum at a speed (about 60 RPM or more) at which the laundry does not fall off the outer circumferential surface of the drum due to the centrifugal force. When the laundry is located near the highest point of the drum And is controlled to supply the reverse torque to the drum 130. [

Accordingly, the laundry rises at the lowest point of the drum 130 along the rotating direction of the drum, and then falls to the lowest point of the drum 130 at the moment when the drum stops due to the reverse torque of the motor 140. For this reason, in addition to the given frictional force, the step motion strongly taps the laundry by using the impact force generated in the process of the laundry falling in the drum falling to the maximum falling level. The mechanical force, i.e., the washing ability, generated by the step motion by the maximum impact force becomes larger than the above-described rolling motion or tumbling motion as well as other motions described later.

Visually, the step motion is such that when the drum rotates clockwise, it moves from the third quadrant to the highest point of the drum from the third quadrant to the highest point of the drum, and suddenly falls off the inner periphery of the drum and falls to the lowest point of the drum. Therefore, since the distance of falling from the inside of the drum in the step motion is the largest, it is possible to more effectively provide the mechanical force when the amount is small.

Meanwhile, the motor 140 is preferably reverse-phase braked for braking the drum. The 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 in order to induce a rotational force in a direction opposite to the direction in which the motor is rotating, and the reverse phase braking enables rapid braking of the motor. Therefore, the reverse phase braking is the most suitable braking method for the step motion in which strong impact is given to laundry.

Thereafter, the motor 140 again applies torque to the drum 130 to raise the laundry at the lowest point of the drum to the highest point. That is, a step motion is implemented by applying a torque so as to rotate clockwise and then instantaneously counterclockwise by applying a torque, and then applying a torque to rotate clockwise again.

As a result, the step motion is a motion in which the washing water and the laundry that have flowed into the through hole 131 are washed by rubbing the laundry while rotating the drum, and the laundry is dropped when the laundry is located at the highest point of the drum.

Fig. 2 (d) is a view showing a swing motion. The swing motion is a motion in which the motor 140 rotates the drum 130 in both directions and the laundry falls down at a position less than about 90 degrees in the rotating direction of the drum.

That is, when the motor 140 rotates the drum 130 counterclockwise at about 40 RPM, the laundry located at the lowest point of the drum 130 is raised counterclockwise by a predetermined height. At this time, the motor stops rotating the drum before the laundry reaches the position of about 90 degrees in the counterclockwise direction of the drum so that the laundry falls in the direction of 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 at about 40 RPM to cause the falling laundry to rise in a clockwise direction along the rotating direction of the drum. Meanwhile, the motor 140 stops the rotation of the drum before the laundry reaches the position of about 90 degrees in the clockwise direction of the drum, so that the laundry falls in the direction of the lowest point of the drum at a position less than about 90 degrees in the clockwise direction of the drum.

That is, the swing motion is a motion in which the one-way rotation and the stop of the drum and the reverse rotation and stop are repeated, and visually, the laundry rises from the third quadrant of the drum to the second quadrant and smoothly falls, And it is a form of repeatedly dropping smoothly.

At this time, the braking of the motor 140 minimizes the load generated in the motor 140 by using the power generation braking, minimizes the mechanical wear of the motor 140, and adjusts the impact applied to the laundry.

The power generation braking is a braking system that uses a motor to serve as a generator due to rotational inertia when a current to be 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, so the force (right hand rule of Flemming) acts in the direction that interferes with the rotation of the motor. Unlike the reverse braking, the power generation braking does not brakes the motor, but smoothly changes the rotating direction of the drum.

Thus, visually, the swing motion becomes a form in which the laundry flows in an eight-letter form lying sideways over the third quadrant and the fourth quadrant of the drum.

As a result, the swing motion causes smooth rotation and dropping of the laundry. Accordingly, the swing motion sweeps the laundry gently in the washing water as a whole, and the laundry is washed using the friction force generated for the swing. For this reason, the swing motion has lower washing ability than other motions, but it can wash weak and delicate clothes without deformation.

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

That is, when the motor 140 rotates the drum 130 counterclockwise at about 60 RPM or more, the laundry located at the lowest point of the drum 130 is raised in a counterclockwise direction by a predetermined height. At this time, the motor provides a reverse torque to the drum after the laundry passes the position of about 90 degrees counterclockwise of the drum, thereby temporarily stopping the rotation of the drum. Then, the laundry on the inner circumferential surface of the drum drops rapidly.

Then, the motor 140 rotates the drum clockwise at about 60 RPM to raise the dropped laundry in the clockwise direction by a predetermined height. The motor 140 provides a reverse torque to the drum 130 when the laundry passes the position of 90 degrees in the clockwise direction of the drum, thereby temporarily stopping the rotation of the drum. Thus, the laundry on the inner circumferential surface of the drum falls to the lowest point of the drum at a position of 90 degrees or more in the clockwise direction of the drum.

Accordingly, the scrubbing motion causes the laundry to be washed down by allowing the laundry to drop rapidly at a predetermined height. Meanwhile, the motor 140 is preferably reverse-phase braked for braking the drum.

The rotating direction of the drum is rapidly changed so that the laundry does not largely deviate from the inner circumferential surface of the drum, so that the friction between the laundry, the friction between the laundry and the washing water, and the friction between the laundry and the drum inner surface are maximized. Therefore, the scrub motion can achieve a very strong scrubbing effect, which is greater than the rolling motion described above. In the scrub motion, the laundry which has moved to the second quadrant through the third quadrant falls rapidly, then moves again to the quadrant of the fourth quadrant, and then drops. Thus, the visually ascending laundry may be repeatedly lowered along the inner circumferential surface of the drum.

Fig. 2 (f) is a diagram showing filtration motion. The filtration motion is a motion in which the motor 140 rotates the drum 130 so that the laundry is not separated from the inner circumferential surface of the drum by the centrifugal force, and the wash water is sprayed into the drum.

That is, since the filtration motion spreads the washing water into the drum while the laundry is spread on the inner circumferential surface of the drum after the laundry is unfolded, the washing water is transferred to the tub 120 through the through holes 131 of the laundry and drum by the centrifugal force . Therefore, the filtration motion widenes the surface area of the laundry, and allows the laundry to penetrate through the laundry, so that the washing water can be supplied to the laundry evenly.

FIG. 2 (g) is a diagram showing a squeeze motion. The squeeze motion repeats the operation of rotating the drum 130 by the motor 140 so that the laundry is not separated from the inner circumferential surface of the drum by the centrifugal force, lowering the rotational speed of the drum 130 to separate the laundry from the inner circumferential surface of the drum , And the washing water is sprayed into the drum during the rotation of the drum.

That is, although the filtration motion is continuously rotated at a speed at which the laundry does not fall from the inner circumferential surface of the drum, the squeeze motion changes the rotating speed of the drum so that the laundry is repeatedly contacted and separated from the inner circumferential surface of the drum 130, .

The process of spraying wash water into the drum 130 during the filtration motion and the squeeze motion may be realized by a circulation flow path and a pump although not shown in FIG. The pump is connected to the bottom surface of the tub 120 to pressurize the washing water. One end of the circulating flow path is connected to the pump, and the other side of the circulating flow path is provided to discharge washing water from the upper portion of the drum to the inside of the drum. .

However, since the circulation flow path and the pump described above are necessary for spraying the washing water stored in the tub, it is preferable to exclude the case where the washing water is sprayed into the drum through the spray water passage connected to the water supply source outside the cabinet no.

That is, if the spray water supply channel is provided with a nozzle connected to the water supply source at one side and connected to the tub and capable of spraying the washing water into the drum, the washing water is supplied to the inside of the drum during filtration motion and squeeze motion. . ≪ / RTI >

As described above, the step motion and scrub motion have higher washing ability than other drum motions. Accordingly, these step and scrub motions will now be described in more detail with reference to Figures 3 and 4.

FIG. 3 is a view showing 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 is moved to the highest point of the drum 130 as shown in Figs. 3 (a) - (c). That is, the laundry in the drum 130 is positioned at a position nearest to the lowest point of the tub 120, and the highest point of the tub 120 As shown in FIG. In order to move the laundry, the motor 140 applies a rotational force, that is, a torque, to the drum 130 in a predetermined direction, that is, in the clockwise direction in the figure, so that the drum 130 rotates together with the laundry in a predetermined direction, Raise the laundry. The laundry is basically brought into close contact with the inner surface of the drum 130 by the friction between the lifter and the inner surface of the drum 130, and can rotate together with the drum 130. In addition, the laundry must be lifted up to the highest point of the drum 130 without being separated from the drum 130. Accordingly, the drum 130 is rotated at a speed of about 60 RPM or more, and this rotational speed generates centrifugal force sufficient for the laundry to be separated from the drum 130 at the highest point of the drum 130. Here, the rotation speed of the drum can be changed so that the centrifugal force becomes larger than the gravity in consideration of the size of the drum such as the inner diameter of the drum. The laundry reaches the highest point of the drum 130 (i.e., the highest point of the adjacent tub 120) from the lowest point of the drum 130 (i.e., the position on the drum inner surface adjacent to the lowest point of the adjacent tub 120, , Hereinafter referred to as "position 2").

Thereafter, the laundry falls from the highest point (position 2) to the lowest point (position 1) of the drum 130. For the fall of such laundry, the drum 130 suddenly stops when the laundry reaches the peak of the drum 130 or just before it reaches. More specifically, a reverse torque is provided to the drum 130 from the motor 140 rotor so that the drum 130 is abruptly stopped. The reverse torque is generated by reverse phase braking which supplies a current of opposite phase to the motor 140 as already explained with reference to Fig. 2 (c). Here, reverse phase braking means applying a reverse current so that the drum rotates in the opposite direction. For example, as shown in the figure, the current is applied to the motor so as to rotate clockwise, and then the current is suddenly rotated in the counterclockwise direction. Since the reverse phase braking timing of the motor 140 is closely related to the position of the laundry in the drum 130, it is preferable that a device capable of judging or predicting the position of the laundry is provided. A sensing device having a Hall effect sensor may be an example. Through the Hall sensor, the control unit can determine not only the rotation angle of the rotor but also the rotation direction. The details of which will be obvious to those skilled in the art, so that a detailed description thereof will be omitted. The control unit can determine the rotation angle of the drum through the sensing device and controls the motor 140 to reverse-phase brakes immediately before the rotation of the drum reaches or reaches 180 degrees. Accordingly, the drum 130 rotating in the clockwise direction is instantaneously stopped by receiving the rotating force in the counterclockwise direction, and the centrifugal force acting on the laundry is removed. Thus, the laundry falls to the lowest point (position 1) of the drum 130. [

Thereafter, as shown in Fig. 3 (d), the drum 130 is continuously rotated in the clockwise direction, and the rotation and dropping of the laundry as described above are repeated. FIG. 3 shows a case where the drum rotates in the clockwise direction, but step motion can be performed during the counterclockwise rotation. However, since the step motion generates a high load to the motor 140, it is preferable to perform the step motion with lowering the actual rate.

The actual rate means the ratio of the motor driving time to the sum of the driving time and the stopping time of the motor 140, and the actual rate 1 means that the motor is driven without stopping time. In the case of the step motion, it is preferable that the actual motion rate is controlled to about 70% in consideration of the load of the motor, and it is an example to stop 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, while the laundry is falling, the drum 130 may start rotating to perform the next step motion. 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 is rotated together with the drum 130 from this point. Therefore, even if the drum 130 is rotated 180 degrees as set, the laundry can not be rotated 180 degrees, that is, to the highest point (position 2) of the drum 130, 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 dropping, the drum 130 is stopped until the point of time when the laundry reaches the lowest point, . The stop holding time of the drum 130 is set to be longer 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 to at least 0.4 seconds, and preferably 0.6 seconds to secure a sufficient stop time.

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

4 is a view showing the scrub motion in more detail.

First, as shown in FIG. 2 (e), the laundry starts from the lowest point of the drum 130 and reaches 90 degrees or more in the clockwise direction of the drum 130 as shown in FIG. 4 (a) As shown in Fig. The laundry 130 in the drum 130 is positioned at a position (position 1) of the inner surface of the drum 120 adjacent to the lowest point of the tub 120. In other words, (Position 2) of the drum inner surface rotated 90 degrees or more in the clockwise direction of the tub 120. In order to move the laundry, the motor 140 applies a rotational force, that is, a torque, to the drum 130 in a predetermined direction, that is, in the clockwise direction in the figure, so that the drum 130 rotates together with the laundry in a clockwise direction, Raise the laundry. The laundry is basically brought into close contact with the inner surface of the drum 130 by the friction between the lifter and the inner surface of the drum 130, and can rotate together with the drum 130. In addition, the laundry must be raised without being separated from the drum 130 to a position of 90 degrees or more (position 3) of the drum 130. Accordingly, the drum 130 is rotated at a speed of about 60 RPM or more, and the rotational speed of the drum 130 is not separated from the drum 130 at a position (position 3) where the laundry is rotated 90 degrees or more from the lowest point of the drum 130 Thereby generating sufficient centrifugal force. Here, the rotation speed of the drum can be changed so that the centrifugal force becomes larger than the gravity in consideration of the size of the drum such as the inner diameter of the drum. As a result, the laundry is rotated together with the drum from the lowest point (position 1) of the drum 130 to a position (position 3) rotated 90 degrees or more from the lowest point of the drum 130.

Thereafter, the laundry falls from the rotated position (position 3) to the lowest point (position 1) by 90 degrees or more. For the fall of such laundry, when the laundry reaches the rotated position at 90 degrees or more, the drum 130 is suddenly stopped. More specifically, a reverse torque is provided to the drum 130 from the motor 140 rotor so that the drum 130 is abruptly stopped. The reverse torque is generated by reverse phase braking which supplies a reverse phase current to the motor 140 as already explained with reference to Fig. 2 (e). Here, reverse phase braking means applying a reverse current so that the drum rotates in the opposite direction. For example, as shown in the figure, the current is applied to the motor so as to rotate clockwise, and then the current is suddenly rotated in the counterclockwise direction. Since the reverse phase braking timing of the motor 140 is closely related to the position of the laundry in the drum 130, it is preferable that a device capable of judging or predicting the position of the laundry is provided. A sensing device having a Hall effect sensor may be an example. Through the Hall sensor, the control unit can determine not only the rotation angle of the rotor but also the rotation direction. The details of which will be obvious to those skilled in the art, so that a detailed description thereof will be omitted. The control unit can determine the rotation angle of the drum through the sensing device. If the rotation of the drum is 90 degrees or more, the control unit controls the motor 140 to reverse-phase braking. Accordingly, the drum 130 rotating in the clockwise direction is instantaneously stopped by receiving the rotating force in the counterclockwise direction, and the centrifugal force acting on the laundry is removed. 4 (c), the laundry does not fall vertically. Instead, the drum 130 rotates in an inclined or inclined manner toward the inner circumferential surface of the drum 130, (Position 1). Due to such a biased fall, the laundry rubs against the inner surface of the drum while falling, and at the same time, the friction between the laundry and the friction between the laundry and the washing water also increases.

Thereafter, as shown in Fig. 4 (d), the drum 130 is subsequently rotated counterclockwise, and as shown in Figs. 3 (e) and 3 (f) The laundry is repeatedly rotated and dropped. FIG. 4 shows a case where the drum rotates first in the clockwise direction, but a counterclockwise rotation may be performed first. It is preferable that the above-described scrub motion is performed by lowering the actual rate because it generates a high load on the motor 140 as in the step motion. After stopping for 4 seconds after the execution of the scrub motion for 10 seconds, It can be an example that it is controlled.

On the other hand, if the laundry falls and reaches the lowest point (position 1) of the drum 130, that is, while the laundry is falling, the drum 130 may start rotating to perform the next scrub motion. 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 is rotated together with the drum 130 from this point. Therefore, even if the drum 130 is rotated 90 degrees or more, as set, the laundry can not be rotated to 90 degrees or more, and washing performance by the desired scrubbing 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 dropping, the drum 130 is stopped until the point of time when the laundry reaches the lowest point, . The stop holding time of the drum 130 is set to be longer than the time required for the laundry to fall from the point (position 3) to the lowest point (position 1) where the laundry is rotated 90 degrees or more. Since the falling 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 such setting of the holding time, the scrub motion can be accurately performed so as to generate friction between the drum inner surface and the laundry, friction between the laundry, friction between laundry and wash water, Can be obtained.

FIG. 5 is a graph comparing the degrees of cleaning force and vibration of each motion shown in FIG. 2. FIG. The axis of abscissa indicates the washing force. It is easy to remove the dirt contained in the laundry as it goes to the left, while it is easy to wash sensitive clothing which is liable to be damaged as it goes to the right side. On the other hand, the axis of ordinate indicates vibration or noise level, and the vibration level becomes higher as it goes to the upper part, but the washing time for the same laundry is reduced. On the other hand, as the vibration level goes down to the lower part of the vertical axis, the washing time is increased.

The step motion and the scrub motion are motions suitable for a washing course in order to shorten the washing time and the contamination of laundry is severe due to excellent cleaning power. In addition, the step motion and scrub motion are motions with high levels of vibration and noise. Thus, it is undesirable motion for a laundry course where the laundry is sensitive or when the laundry course needs to minimize noise and vibration.

The rolling motion is a motion characterized by excellent cleaning power, low vibration level, minimization of laundry damage, and low motor load. Therefore, it can be applied to all washing courses, but it is especially suitable for the initial detergent dissolving and laundry wetting.

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

The squeeze motion is similar to the tumbling motion in the three-tipping force, and the vibration level is higher than the tumbling motion. The squeeze motion is a motion useful for the step of rinsing since the washing water is discharged to the outside of the drum through the laundry in the process of repeating the contact and separation of the laundry on the inner circumferential surface of the drum.

In the filtration motion, the cleaning force is lower than the squeeze motion, and the degree of noise is motion similar to rolling motion. The filtration motion is a motion that is useful for the step where the laundry is adhered to the inner circumferential surface of the drum and the laundry is discharged to the outside of the drum through the laundry so that the laundry is required.

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

As described above, each drum driving motion has advantages and disadvantages. Therefore, in consideration of such advantages and disadvantages, it would be desirable to appropriately use various drum driving motions. Also, each drum driving motion will have advantages and disadvantages in relation to the quantity of drum. Therefore, in the case of the same course, the same stroke, etc., it is desirable to appropriately use various drum driving motions in relation to the amount of the drum.

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

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

3 is a detailed view of the step motion.

4 is a detailed view of the scrub motion.

Fig. 5 is a graph comparing cleaning power and vibration level of each motion.

Claims (11)

Rotating the drum for receiving the laundry with the laundry in a first rotation direction at a first speed; Abruptly stopping the drum so that the laundry falls to the bottom of the drum; Maintaining the drum stationary until the laundry reaches the bottom of the drum, Wherein the drum is stopped for a longer period of time than the time required for the laundry to fall to the bottom of the drum. The method according to claim 1, Wherein the first speed is 60 RPM. The method according to claim 1, Wherein the stopping step comprises providing a reverse torque to the drum. The method of claim 3, Wherein the step of providing the reverse torque comprises supplying a reverse current to the motor so as to rotate the drum in a second direction opposite to the first direction. delete The method according to claim 1, Wherein the rotating step comprises a first rotating step of rotating the drum and the laundry up to 180 degrees. The method according to claim 6, Further comprising repeating the first rotation step, the stopping step, and the stop keeping step for a predetermined time after the stop keeping step. The method according to claim 6, Wherein the stop state is maintained for at least 0.4 seconds. The method according to claim 1, Wherein the rotating step comprises a second rotating step of rotating the drum and the laundry by 90 degrees or more. 10. The method of claim 9, A third rotating step of rotating the drum and the laundry in a second direction opposite to the first direction by 90 degrees or more after the stopping and holding step and a control of the washing machine further including the stopping step and the stopping step Way. 10. The method of claim 9, Wherein the stop state is maintained for at least 0.2 seconds.

Images