KR101674936B1 - Controlling Method of Washing Machine - Google Patents

Abstract

The present invention relates to a control method for a drum apparatus that controls a drum motion in which a drum is rotated in a set speed and a set direction, and measures a maximum value of a starting current by rotating a predetermined angle drum in a direction opposite to a direction set in the drum motion An open loop start in which the drum is rotated in a set direction of the drum motion with a maximum value of the measured starting current; And a feedback operation for converting and supplying a current to a current value required for the set speed of the drum motion.

Washing machine, Drum motion, Starting motion, Starting current, Holding current

Description

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

The present invention relates to a control method of a washing machine for controlling a drum motion that rotates a drum at a set speed and a setting direction.

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-mentioned structure removes the dirt contained in the laundry by the chemical action of the detergent stored in the washing water, the frictional force of the laundry stored in the drum, and the laundry stored in the tub. Therefore, the combination of the rotational direction and the rotational speed of the drum is closely related to the washing performance of the washing machine.

On the other hand, in the case of the conventional washing machine, there is a problem of a current peak at which the current supplied to the motor rapidly increases at the initial rotation of the drum in order to rotate the drum in the set direction during washing.

The present invention provides a control method of a washing machine capable of minimizing a current peak occurring in an initial process of drum motion.

In order to solve the above-described problems, the present invention provides a washing machine comprising a drum into which laundry is introduced, and a motor for rotating the drum in the forward and reverse directions, A method of controlling an apparatus, comprising: a first step of rotating a drum in a direction opposite to a setting direction set in the drum motion; a step of rotating the drum in a first step, A second step of braking the motor by determining whether or not an angle has been reached; and a second step of rotating the drum in the same direction as the setting direction of the drum motion with the maximum value of the current supplied to the motor until the end of the second step A third step of rotating the drum at a predetermined second reference position or a second reference angle when the position of the drum rotated in the third step reaches a preset reference position or a second reference angle, Year before the start of the drum motion a fourth step of supplying the required current to provide a control of the washing machine characterized in that to proceed.

In this case, the control method of the washing apparatus of the present invention may be characterized in that the third step is started at a point where the position energy of the laundry due to inertia is maximum after the completion of the first step and the second step.

According to the control method of the washing machine according to the present invention, the effect of minimizing the current peak occurring in the initial process of the drum motion can be achieved.

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 control unit (not shown) 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 generates rotation of a drum, particularly a drum, for driving the drum in various drum driving motions.

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.

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.

Since the laundry is raised by the lift 135 provided on the inner peripheral surface of the drum when the drum rotates, the shock applied to the laundry can be changed by controlling the rotating 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, it is an object of the present invention to provide a control method for a washing machine having various drum driving motions, and to provide a control method of a washing machine having various drum driving motions by varying drum driving motions according to the type of laundry, the contamination degree of laundry, So that the laundry can be processed by the mechanical force of the washing machine. 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 so that the laundry on the inner circumferential surface of the drum falls down to the 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.

Accordingly, the tumbling motion allows the laundry to be washed by the impact force caused by the friction with the wash water and the falling water, so that the laundry is rinsed and rinsed with a mechanical force greater than the mechanical force in the rolling motion. 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 along the rotational direction of the drum at the lowest point of the drum 130 and falls to the lowest point at the highest point of the drum 130 as the drum stops due to the reverse torque of the motor 140, Is a motion that is washed by the impact force generated in the course of the laundry falling in the drum falling to a maximum falling level. The mechanical force generated by such step motion becomes larger than the above-described rolling motion or tumbling motion.

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 phase braking is a method of generating a rotational force in a direction opposite to the direction in which the motor is rotating, thereby braking the motor. 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 is dropped after a point 90 degrees in the rotational direction of the drum has passed.

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 the rotation of the drum after the laundry passes through the 90-degree counterclockwise point of the drum, so that the laundry drops to the lowest point of the drum after passing a 90-degree counterclockwise point 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 after the laundry passes the 90-degree clockwise point of the drum, so that the laundry falls in the direction of the lowest point of the drum at a position passing the 90-degree clockwise position 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.

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 to drop laundry at a position of about 90 degrees or more in the rotating direction of the drum through reverse phase braking.

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 deviate greatly from the inner circumferential surface of the drum, and the effect of rubbing very strongly is obtained. 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 widens the surface area of the laundry in contact with the washing water, and allows the washing water to penetrate through the laundry, so that the washing water can be supplied to the laundry evenly.

The method of spraying the washing water to the drum in the filtration motion may be realized by circulating and circulating washing water stored in the tub by using a circulation channel (not shown) and a pump (not shown).

Meanwhile, the filtration motion may be performed so as to cause the laundry to closely contact with the inner circumferential surface of the drum without spraying the washing water. In order to induce the bubble dispersion, the filtering motion may be applied to induce the bubble dispersion in the post- .

In addition, the filtration motion may be implemented by spraying clean wash water supplied from an external water source without circulating the wash water stored in the tub. In order to distinguish the wash water stored in the tub from the case of circulating the wash water, (Spary Rinse motion). The spray rinse motion is motion suitable for a stroke requiring rinsing because it uses clean wash water.

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 injection 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 wash water into the drum, filtration of the water in the drum during filtration motion and squeeze motion You will be able to spray water.

FIG. 3 is a view showing the step motion in more detail. When the motor 140 applies a torque to the drum 130 in a predetermined direction, the drum rotates in a predetermined direction, so that the laundry is brought into close contact with the inner circumferential surface of the drum 130. At this time, it is preferable that the drum is rotated at about 60 RPM or more so that the laundry can be closely attached to the inner circumferential surface of the drum. Here, the rotational speed of the drum is determined in relation to the inner diameter of the drum, and is determined as the rotational speed at which the centrifugal force becomes larger than the gravitational force.

The motor 140 is reverse-phase braked to temporarily stop the rotation of the drum just before the laundry reaches the highest point in the drum beyond the 90-degree rotation direction of the drum 130. [ 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 is able to determine the rotation angle of the drum through the sensing device and controls the motor 140 to reverse-phase brakes before the drum reaches 180 degrees. Here, reverse phase braking means applying a reverse current so that the drum rotates in the opposite direction. For example, the current is applied to the motor so as to rotate clockwise, and then the current is suddenly rotated counterclockwise.

Therefore, the drum rotating in the clockwise direction is instantaneously stopped, and the angle at this time is substantially 180 degrees, so that the laundry falls to the lowest point inside the drum at the highest point inside the drum. Then, the current is continuously applied so that the drum rotates clockwise continuously.

FIG. 3 shows a case in which the drum rotates in the clockwise direction, but step motion may 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.

4 is a view showing the scrub motion in more detail. When the motor 140 applies torque to the drum 130, the laundry in the drum rotates clockwise. It is preferable that the drum 130 controls the motor 140 to have a rotation speed of about 60 RPM or more so that the laundry can be closely contacted to the inner circumferential surface of the drum. Then, when the laundry passes through a point of 90 degrees in the rotational direction of the drum, the motor 140 is reverse-phase braked, so that the laundry adhering to the inner circumferential surface of the drum falls to the lowest point of the drum.

When the laundry falls to the lowest point, the motor 140 provides a torque to rotate the drum counterclockwise. Therefore, the dropped laundry is brought into close contact with the inner circumferential surface of the drum and is rotated in the counterclockwise direction. When the laundry is positioned between the point 90 degrees counterclockwise from the lowest point of the drum and the highest point of the drum, The laundry is dropped to the lowest point of the drum.

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.

Although not shown, the swing motion changes the braking system of the motor to the power generation braking in the scrub motion, and the timing of the power generation braking is changed when the laundry reaches the point 90 degrees in the rotational direction of the drum.

Each of the above-mentioned drum motions is rotated in a predetermined direction (clockwise or counterclockwise) by a predetermined angle in the direction opposite to the set rotational direction before the drum is rotated, and then is subjected to a driving motion (so-called Active-i motion) Is preferably controlled.

In the drum motion, when the drum is immediately rotated at a set speed (set number of revolutions, rpm) of the drum motion, a current peak at which the current value supplied to the motor sharply increases at the beginning of the drum motion may occur.

That is, since the load of the motor is greatest between the lowest point of the drum and the point of 90 degrees in the rotational direction, laundry is put into the drum before the start of the drum motion, and therefore, in order to rotate the drum at the set speed of the drum motion, And the amount of current to be supplied becomes even larger when the amount of the charged drum is large.

If a current peak occurs in the early stage of the drum motion, it may cause a problem in the safety of the washing machine. If the control to change the actual rate of the motor is performed to secure the safety of the washing machine, The invention provides a control method of a washing machine that implements drum motion after a starting motion for easy implementation of the drum motion.

That is, the starting motion for rotating the drum in the drum motion setting direction after rotating the drum motion by a predetermined angle in the direction opposite to the drum motion setting direction can use the position energy obtained while the laundry rotates in the direction opposite to the setting direction of the drum motion It is possible to prevent a drastic increase in the current value supplied at the beginning of the drum motion and to determine the value of the current to be supplied at the beginning of the drum motion based on the amount of the drum inserted into the drum, Can be prevented.

FIG. 5 is a view showing the rotation of the drum in the starting motion of the present invention, and FIG. 8 is a flowchart showing the control steps of the starting motion of the present invention.

Hereinafter, the starting motion of the present invention will be described first from the viewpoint of the drum, and then the starting motion will be described from the viewpoint of the control step.

5 (a) shows a state in which laundry is put into a drum before start-up motion, and FIG. 5 (b) shows a case in which drum motion is set in a clockwise direction (Observation start) in which the drum is rotated to the reference angle.

That is, when the drum motion is set to the clockwise direction, the observation start will cause the drum to rotate counterclockwise, and if the drum motion is set to the counterclockwise direction, the observation start will cause the drum to rotate in the clockwise direction. Hereinafter, the case where the setting direction of the drum motion is clockwise will be described as a reference.

The drum is rotated counterclockwise by a predetermined reference angle (first reference angle or first reference position) at the start of observation. The "reference angle" can be selected from a significant interval of 15 to 45 degrees at which the amount of fuel can be sensed through the current supplied to the motor (hereinafter referred to as " Fig.

In order for the drum to rotate to the reference angle, the controller supplies current to the motor. The current value supplied when the amount of laundry is large and the current value supplied when the amount of laundry is small are different.

That is, referring to FIG. 6, it can be seen that as the amount of laundry increases, the starting current in the starting operation increases, and the magnitude of the current supplied to maintain the drum motion (hereinafter referred to as "holding current" (Hereinafter referred to as "half load"), which is half of the washing capacity.

The reason why the maintenance current is supplied most at the half load is that the laundry flows in the drum is the most severe when the amount of the laundry corresponds to half of the washing capacity and the flow of the laundry caused during the drum motion acts as the load of the motor This is because a large amount of flow current is required for the flow of the drum motion.

That is, when the amount of the laundry exceeds the half load, the space in which the laundry can flow within the drum is reduced, so that the load caused by the flow of the laundry is small. As a result, This is because drum motion can be driven. If the amount of the laundry is less than the half load, the flow of the laundry in the drum is large, but the amount of the laundry is small and the motor load generated by the flow of the laundry in the drum is not large enough to raise the holding current value.

On the other hand, the maximum value of the starting current value required at the start of observation is stored in a storage means such as a memory by the control unit, and is utilized at the time of starting the open loop described later.

When the observation start is terminated, the present invention brakes the motor in order to maximize the potential energy of the laundry. As shown in FIG. 5 (c), the laundry loaded into the drum and the drum may be further rotated by a predetermined angle due to inertia of the observer's motion.

That is, the position A of the laundry shown in FIG. 5 (c) is the maximum point of the potential energy of the laundry by the observation start, and the position energy of the laundry in the open- There is an advantageous effect of increasing the rotating speed of the drum when the open loop is started.

On the other hand, the maximum point A of the potential energy that the laundry can have through the observation start can be determined through a sensing device such as a Hall sensor provided in the motor.

Since the motor is braked after the observation start is completed, the drum will rotate by inertia in the same rotation direction (counterclockwise direction) as the rotation direction at the start of observation, but at the point (A) where the potential energy of the laundry becomes maximum, It will rotate clockwise after stopping due to its own weight.

Therefore, when the Hall sensor recognizes the rotation stop of the drum or the turning direction of the drum reaches the point A where the potential energy of the laundry reaches the maximum, the open loop shown in FIG. 5 (d) Start is started.

The open loop start is a section for rotating the drum clockwise using the maximum value of the starting current value supplied at the start of observation (or a value obtained by amplifying the maximum value of the starting current at a predetermined ratio) O) and the position energy maximum point (A) of the laundry is rotated (clockwise) corresponding to twice the angle.

That is, in the open loop start, the angle from the lowest point O of the drum to the maximum energy point A of the laundry and the position (B, the second reference angle or the second reference position Are equal to each other. This is to maximize the potential energy secured by the observation start and to prevent current peaks in which the current value supplied to the motor sharply increases in the section (O-B section) where the load of the motor is maximized.

It is preferable that the current value supplied to the motor during the open loop start operation is supplied as the maximum value of the starting current supplied simultaneously with the observer.

If the drum motion is implemented without starting observation, or if the current required for the rpm set in the drum motion is directly supplied to the motor after the start of the observation, there may be a problem of a current peak in which the current value supplied to the motor rises sharply (Fig. 7 (a)). This is because, as described above, when the laundry passes through the position B corresponding to the maximum point A of the potential energy, the load of the motor becomes maximum and a large current is instantaneously required to be. Therefore, the open loop operation is performed in a period in which the load of the motor is maximized by rotating the drum to the maximum value of the starting current required for the above-described starting operation up to the position B corresponding to the maximum energy point A of the laundry Thereby preventing a sudden increase in the current value (see Fig. 7 (b)).

When the open loop start is completed, the feedback start shown in Fig. 5 (e) is started. The feedback start is a step of converting the maximum value of the starting current supplied to the motor in the open loop start to a current value required for rotating the drum at a set speed (set rotation speed, rpm) of the drum motion. The switching to the feedback operation is possible by monitoring the rotation angle of the drum through a sensing device such as the hall sensor described above. When the current value supplied to the motor through the feedback operation is changed, the predetermined drum motion proceeds .

Hereinafter, with reference to FIG. 8, the starting motion of the present invention will be described in terms of the control step.

When the start signal of the drum motion is applied (S10), the control method of the washing machine of the present invention is such that the drum motion after the start motion (S20) including the observation start (S21), the open loop start (S25) S30).

The observation start S21 supplies power to the motor to rotate the drum in the first direction (the direction opposite to the setting direction of the drum motion) (S211).

(S212) whether or not the drum reaches a point (S, see FIG. 5) corresponding to the reference angle after power is supplied to the motor (S212). If the drum does not reach the reference angle The power is supplied to the motor so that the motor can continue to rotate in the first direction. However, if it is determined that the drum has reached the reference angle, the power supply to the motor is interrupted (S213).

Meanwhile, in step S213, the power supply to the motor is interrupted, and at step S214, the starting current value (or the maximum value or average value of the starting current) is determined from the power supplied to rotate the drum to the reference angle.

Thereafter, a step S23 of determining whether the laundry is located at a maximum point A of the position energy (see FIG. 5) is continued. When it is determined that the laundry is located at the position energy maximum point A, The start (S25) is started.

In step S251, a power for rotating the drum in a second direction opposite to the rotating direction of the simultaneous drum of the observer is supplied (S251). At this time, It is preferable that it is equal to the maximum value of the current.

(S252) whether or not the drum has reached the point (B) corresponding to the open loop reference angle, and when the open loop reference angle is reached, the feedback start (S27) .

The current value supplied to the motor through the feedback start S27 is switched from the maximum value of the starting current supplied to the motor at the time of the open loop start (S25) to the current value required for the drum motion set speed (rpm) The drum is rotated (S30, drum motion) in the preset speed and setting direction of the predetermined drum motion.

In the above description, the starting motion according to the present invention has been described with reference to the preceding motion of the seven drum motions shown in FIG. 2. However, since the drum motion disclosed in FIG. 2 is a case in which the drum is rotated in other motions The effect of the starting motion of the present invention can be realized even if the starting motion of the present invention is preceded by the present invention. Therefore, it is not necessary to limit the objects and effects of the present invention to the starting motion preceding the drum motion disclosed in Fig.

The present invention may be embodied in various forms without departing from the scope of the invention. Therefore, it is to be understood that within the scope of the appended claims, the invention is not limited thereto.

1 is a perspective view of a washing machine.

2 is a view showing a drum motion used in a control method of the washing apparatus of the present invention.

3 is a detailed view of the step motion.

4 is a detailed view of the scrub motion.

5 is a conceptual diagram of the start motion.

FIG. 6 is an experimental graph showing the tendency of the starting current and the holding current according to the amount of discharged.

7 is a graph comparing the current peaks of the drum motion with the start motion and the drum motion without the start motion.

8 is a flowchart of a method of controlling the washing apparatus of the present invention.

Claims (4)

A control method of a washing machine comprising a drum to which laundry is introduced and a motor for rotating the drum in a forward and reverse direction to control the drum motion in which the drum rotates in a set speed and a set direction, A first step of rotating the drum in a direction opposite to the setting direction set in the drum motion; A second step of braking the motor by determining whether the position or angle of the drum rotated in the first step reaches a predetermined first reference position or a first reference angle; A third step of rotating the drum in the same direction as the setting direction of the drum motion with the maximum value of the current supplied to the motor from the first step to the end of the second step; A fourth step of supplying a current necessary for maintaining the set speed of the drum motion when the position of the drum rotated in the third step reaches a predetermined second reference position or a second reference angle, Wherein the control means is configured to control the drum driving means so as to stop the current peak in the entire drum motion step. The method according to claim 1, Wherein the third step is started at a point where the position energy of the laundry due to the inertia is maximum after the completion of the first step and the second step. 3. The method of claim 2, Wherein the determination of the point at which the position energy of the laundry is at the maximum is determined as to whether or not the available rotation of the laundry is stopped after the end of the second step. The method of claim 3, The second reference position or second reference angle Wherein the angle of rotation of the drum when the rotation of the drum is stopped is equal to the angle of rotation of the drum.

Images