KR20190094012A - Washing machine and controlling method for the same - Google Patents

Abstract

The present invention relates to a washing machine for reducing vibration and noise generated during driving. According to one embodiment of the present invention, the washing machine includes: a cabinet; a tub received in the cabinet; a drum rotationally provided in the tub; a motor installed on the tub and providing rotation power to the drum through a horizontal axis penetrating the drum; a vibration detecting sensor installed on the cabinet and measuring the amount of vibration of the cabinet; a memory in which the set amount of vibration for determining abnormal vibration of the cabinet is stored; and a control unit comparing the measured amount of vibration and the set amount of vibration and determining the abnormal vibration of the cabinet. Also, when being determined as the abnormal vibration is generated in the cabinet, the control unit reduces a rotation speed of the motor. Accordingly, the present invention can reduce the vibration and the noise of the washing machine.

Description

Washing machine and its control method {WASHING MACHINE AND CONTROLLING METHOD FOR THE SAME}

The present invention relates to a washing machine and a control method thereof.

In general, a washing machine is an apparatus for processing laundry through various actions such as washing, dehydration, and / or drying. The washing machine includes an outer tub for containing water, and an inner tub rotatably provided in the outer tub and having a plurality of through holes through which water passes.

The washing machine is a form in which laundry (or cloth) is injected from the upper side, and a top load washer in which the inner tank is rotated about a vertical axis, and the laundry is inserted in the form of the laundry being loaded from the front. The drum may include a front load washing machine in which the drum is rotated about a horizontal axis.

In the washing machine, when a user selects a desired course using a control panel while laundry such as clothes or bedding is put in the inner tank, a predetermined algorithm is executed corresponding to the selected course, thereby supplying / draining, washing, and rinsing. , Dehydration and the like are carried out.

Operation of the washing machine is typically divided into washing stroke, rinsing stroke, and dehydration stroke. The progress of this stroke can be confirmed by the display provided in the control panel.

The washing administration is to supply detergent with water into the inner tank to remove contaminants on the laundry using the chemical action of the detergent and the physical action of the pulsator and / or rotation of the inner bath.

The rinsing stroke is to rinse the laundry by supplying clean water in which the detergent is not dissolved in the inner tank, and in particular, due to the rinsing stroke, the detergent absorbed in the laundry may be removed. In the rinsing cycle, a fabric softener may be supplied together with water into the inner tank.

The dehydration stroke is to dehydrate the laundry by rotating the inner tank at a high speed after the rinsing stroke is completed. Typically, the dehydration stroke is completed, so that all operations of the washing machine can be terminated. However, in the case of a combined dry washing machine, a drying stroke may be further added after the dehydration stroke.

On the other hand, in the high-speed rotation process of the inner tank for the dehydration stroke, when the laundry inside the inner tank is directed to one side, the central axis of rotation of the inner tank is off (or biased) may cause vibration in the washing machine cabinet. Due to this vibration, not only noise is generated, but also a problem of low dehydration effect may occur. In addition, due to the vibration of the washing machine cabinet, there may be a problem that the mechanical life of the washing machine is reduced.

In order to solve such a problem, the present applicant has conventionally applied the application (hereinafter, referred to as a prior document). The information of the prior document is as follows.

1.Publication number (public date): 10-2005-0110071 (November 22, 2005)

2. Name of invention: Ball balancer of washing machine

The washing machine of the prior art is provided with a ball balancer for maintaining the balance of the inner tank rotated in the dehydration stroke. If the center of the inner tank is directed to either side due to the eccentricity of the laundry, the ball of the ball balancer can be moved to the other side of the laundry eccentric. Due to the characteristics of the ball balancer, the eccentricity of the inner tank was corrected, and vibration of the washing machine cabinet could be reduced.

On the other hand, in the dehydration process, a difference may occur between the rotational speed of the ball provided in the ball balancer and the rotational speed of the washing machine inner tank (or motor). In addition, a resonance band may occur in the washing machine due to the difference in rotation speed. The resonance band is a physical property of the washing machine itself, and may mean a rotation speed section of the inner tank in which vibration is suddenly generated.

In order to avoid such a resonant band, conventionally, in the product design process, the resonant band generated in the dewatering stroke is known in advance, and the rotation speed of the inner tank is set in advance so as to avoid the resonant band in actual dewatering stroke.

Meanwhile, the resonance band set during the product design process may vary according to the installation environment (or an external environment element) of the product. For example, the resonance band of the washing machine set in the design process according to the state of the floor (for example, the slope) on which the washing machine is installed, or the washing machine installation state (the tilt of the washing machine cabinet to the floor) by the serviceman's skill and Resonant bands of the washing machine installed in the user's space may be different.

In addition, as the washing machine operating time accumulates, the state of the floor on which the washing machine is installed may vary. In this case, the resonance band of the washing machine set in the product design process and the resonance band of the washing machine installed in the user's space may be different from each other.

Due to the above problem, due to the difference between the resonant band of the washing machine and the resonant band of the washing machine installed in the user's space, there is still a problem that the vibration and noise occurs in the dehydration process of the washing machine.

It is an object of the present invention to provide a washing machine and a control method thereof for reducing vibration and noise generated during operation.

In particular, it is an object of the present invention to provide a washing machine and a control method thereof that can reduce vibration and noise generated during operation due to external environmental factors.

Another object of the present invention is to provide a washing machine and a control method thereof, which can reduce a phenomenon in which vibration and noise are generated by accumulating operation time.

Washing machine of the first invention according to an embodiment for solving the above problems, is installed in the cabinet, the vibration sensor for measuring the vibration amount of the cabinet, and the set vibration amount for determining the abnormal vibration of the cabinet And a controller for comparing the measured vibration amount and the set vibration amount to determine abnormal vibration of the cabinet.

When it is determined that the abnormal vibration occurs in the cabinet, the controller reduces the rotation speed of the motor, and thus, the vibration and noise generated in the cabinet can be reduced because the rotation speed of the motor is reduced.

The controller according to the second aspect of the present invention determines that abnormal vibration has occurred in the cabinet when the measured vibration amount is larger than the set vibration amount.

In the third invention, the memory stores a first speed, which is a rotational speed corresponding to the output level of the motor, a limit speed at which the abnormal vibration is expected to occur, and a second speed smaller than the limit speed.

The control unit according to the fourth invention drives the motor at the first speed when the output level of the motor is input through the input unit.

The controller decelerates the motor at the second speed when the set time elapses.

The controller according to a fifth aspect of the present invention reduces the limit speed by a set speed when the abnormal vibration is recognized in the process of driving the motor at the first rotation speed.

The controller may reduce the second speed in proportion to the change amount of the threshold speed.

According to the third to fifth invention, when the motor is operated at a second speed for balancing the drum, vibration and noise are generated in the washing machine by external environmental factors including the slope of the floor, the degree of purity of the installer, and the like. This can reduce the phenomenon.

If it is determined that abnormal vibration occurs in the cabinet, the controller stores the rotation speed of the motor at the time when the abnormal vibration occurs in a memory.

According to a seventh aspect of the present invention, if the rotational speed of the motor at the time when the abnormal vibration occurs is stored a predetermined number of times, the controller calculates an average value for the rotational speeds of the stored motor, and uses the calculated average value as the threshold speed. Update to

The control unit according to the eighth invention may vary the second speed in proportion to the amount of change in the threshold speed.

According to the sixth to eighth inventions, the speed limit may be varied in correspondence with the internal elements of the washing machine (for example, the durability of each component) and the external elements (for example, the slope of the floor) that vary according to the accumulation of operating time. . Therefore, even if the running time is accumulated, it is possible to reduce the phenomenon that the vibration and noise of the washing machine increases.

In a ninth aspect of the invention, it further comprises a balancer for compensating for the eccentricity of the drum.

In the tenth invention, the balancer is disposed in front of the drum, and is disposed along the outer circumferential surface of the drum.

The control method of the washing machine of the 11th invention. Inputting a dehydration stroke level, driving a motor at a rotational speed corresponding to the dehydration stroke level, monitoring a cabinet for abnormal vibration, and if it is determined that abnormal vibration has occurred in the cabinet, Reducing the rotational speed of the motor.

According to the washing machine and its control method according to the present embodiment, when abnormal vibration is detected in the dehydration process, the controller of the washing machine reduces the rotation speed of the motor. Therefore, vibration and noise generation of the washing machine can be reduced.

In addition, when the abnormal vibration is detected, it is possible to reduce the limit speed (resonance RPM) corresponding to the input dehydration stroke level. The controller may reduce the rotation speed of the motor corresponding to the dehydration stroke level in proportion to the reduced speed limit. Therefore, in the next dehydration operation of the washing machine, a phenomenon in which vibrations and noises are generated in the washing machine may be reduced by the rotation speed of the motor approaching a limit speed. In addition, the speed limit set in the product design process may be changed to a speed limit suitable for various installation environments.

The controller may record the rotation speeds when the abnormal vibration is detected in the dehydration process for a set number of times and calculate an average value using the rotation speeds. The controller may update the calculated average value with a new limit speed. In this case, the controller may update the rotation speed corresponding to the dehydration administration process by using the change amount of the limit speed. Therefore, even if the installation environment of the washing machine or the state of the product varies according to the accumulation of operating time, the rotational speed of the motor reaches the limit speed, thereby reducing the phenomenon of vibration and noise in the washing machine.

In addition, when providing a washing machine installation service, the limit speed setting mode may be used to set a limit speed of a motor suitable for a user's installation environment. Therefore, there is an advantage that can provide an improved installation service to the user.

In addition, vibration and noise generated in the washing machine may be reduced due to external factors such as the assembled state of the washing machine and the installation skill of the serviceman.

1 is a perspective view of a washing machine according to an embodiment of the present invention.
2 is a longitudinal sectional view of the washing machine according to one embodiment.
3 is a block diagram illustrating a control configuration of a washing machine according to an embodiment.
4 is a flowchart illustrating a control method of a washing machine for reducing vibration according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present invention, when it is determined that a detailed description of a related well-known configuration or function interferes with the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but between components It will be understood that may be "connected", "coupled" or "connected".

[Configuration of washing machine]

1 is a perspective view of a washing machine according to an embodiment of the present invention, Figure 2 is a longitudinal sectional view of the washing machine according to an embodiment.

First, referring to Figure 1, the washing machine 1 according to an embodiment of the present invention is large, the cabinet (cabinet 10) to form the exterior, and the laundry entrance 11 is mounted on the front of the cabinet 10 A front cover 12 may be formed, and a drum 20 in which laundry may be accommodated. In addition, the washing machine 1 may include a motor 30 that provides rotational power to the drum 20, and a tub 40 that accommodates the drum 209 and the motor 30. Can be.

The cabinet 10 may be provided in a substantially hexahedral shape. In addition, a space for installing a plurality of components may be formed in the cabinet 10 of the washing machine 1. The plurality of parts may include, for example, the drum 20, the motor 30, the tub 40, and a control configuration for controlling the motor.

A laundry entrance 11 may be formed at the front cover 12. The laundry entrance 11 may be formed at a central portion of the front cover 12. In addition, the front cover 12 may be rotatably provided with a door 13 for opening and closing the laundry entrance 11. A gasket may be provided between the door 13 and the tub 40 to maintain airtightness.

The washing machine 1 may further include a control panel 14 provided at an upper front side of the cabinet 10. The control panel 14 may include a display 141 for displaying an operating state of the washing machine 1. The control panel 14 may be provided with a plurality of buttons or knobs for manipulating the operation of the washing machine 1.

The washing machine 1 may further include a detergent drawer 15 provided at the upper front of the cabinet 10. The detergent drawer 15 may be provided on the side of the control panel 14. The detergent drawer 15 may be provided in a shape in which a portion into which the detergent is injected and stored and a portion exposed to the front surface are integrated.

The detergent drawer 15 may be connected to a water supply pipe (51 of FIG. 2) to which cold / hot water is supplied. Cold / hot water may be introduced into the detergent drawer 15 from the water supply pipe 51. In addition, water mixed with at least one of the detergent and the fabric softener of the detergent drawer 15 may be supplied to the drum 20 in which the laundry is accommodated via the tub 40.

The washing machine 1 may further include a service cover 16 provided at the bottom of the front surface of the cabinet 10. The service cover 16 is configured to open in the state in which the washing machine 1 is stopped and to remove residual water present in the washing machine 1.

On the other hand, the drum 20 may be provided in a substantially cylindrical shape. The motor 30 may be fixed to the tub 40. A drive shaft 31 provided horizontally with respect to the tub 40 may be coupled to the motor 30. The drive shaft 31 may pass through the drum 20. Therefore, when the driving shaft 31 is rotated by the driving of the motor 30, the drum 20 accommodated in the tub 40 may be rotated together with the driving shaft 31. Wash water may flow into the tub 40. In this case, the tub 40 may have airtightness so that washing water does not leak out of the tub 40.

One side of the drum 20 may be formed with an opening for injecting laundry. The position of the opening may correspond to the position of the laundry entrance 11. The opening may be opened or closed by the rotation of the door 13.

When the positional relationship between the door 13, the drum 20, and the door 13 is summarized, the door 13 may be located at one side of the drum 20, and the door 13 may face the door 13. The other side of the drum 20 may be a drive shaft 31 connected to the motor 30.

On the other hand, the washing machine 1 may further include a lifter 21 installed on the inner surface of the drum 20. The lifter 21 may be provided in a shape extending in the front-rear direction (right and left direction in the drawing) of the drum 20. In addition, the lifter 21 may have a shape protruding from the inner surface of the drum 20 to the inside of the drum 20 to a predetermined height. In addition, the lifter 21 may be provided in plurality. In this case, each of the plurality of lifters 21 may be disposed spaced apart from each other by a predetermined interval along the circumferential direction of the drum 20. Therefore, when the drum 20 is rotated, the lifter 21 may load the laundry so that the laundry falls by gravity at a predetermined height.

A plurality of through holes 22 may be formed in the drum 20. The wash water introduced into the tub 40 may be introduced into the drum 20 through the through hole 22. In addition, during dehydration after washing, washing water in the drum 20 may be drained to the tub 40 through the through hole 22. In this case, the wash water introduced into the tub 40 may be drained to the outside of the cabinet 10 through the drain pipe 52.

A damper 41 may be installed between the upper side of the outer circumferential surface of the tub 40 and the inner side of the upper side of the case 10 to damp the vibration of the tub 40.

The washing machine 1 may be disposed on the front of the drum 20, and may include a balancer 45 formed in a ring shape along the circumferential direction of the drum 20. The balancer 45 may compensate for unbalancing generated when the drum 20 rotates.

For example, the balancer 45 may include an annular racer having a plurality of metal balls therein, and may include a ball balancer filled with fluid. When the drum 20 is rotated in an unbalanced state, the ball provided in the racer is moved in a direction to compensate for the weight deviation by the difference in the centrifugal force caused by the unbalanced rotation. Due to the characteristics of the ball balancer, the drum 20 may be restored to a balanced state.

As another example, the balancer 45 may include a liquid balancer composed of an annular racer that is filled with liquid (eg, brine) and then completely sealed by heat fusion. When the liquid balancer rotates, the liquid may be well distributed in the circumferential direction of the liquid balancer by centrifugal force when the drum 20 rotates, so that the balancing state of the drum 20 may be maintained.

On the other hand, the washing machine 1 may further include a vibration measuring sensor 60 installed in the cabinet 10. The vibration measuring sensor 60 may be attached to the cabinet 10 to measure the vibration of the cabinet 10. In detail, the vibration measuring sensor 60 may measure vibration generated in the cabinet 10 by the rotation of the drum 20. The vibration amount (hereinafter, measured vibration amount) measured by the vibration measuring sensor 60 may be transmitted to a controller (990 of FIG. 3) for controlling the rotational speed (or RPM) of the motor 30. have.

[Control Structure of Washing Machine]

3 is a block diagram illustrating a control configuration of a washing machine according to an embodiment.

Referring to FIG. 3, the washing machine 1 may include a power supply unit 910. The power supply unit 910 may convert the commercial power into a power source that conforms to the standard of each control configuration of the washing machine 1, and then supply the control power to each control configuration of the washing machine 1. For example, the power supply unit 910 may supply power to the motor 30.

The washing machine 1 may include an input unit 920 for inputting a user command and an output unit 930 for displaying a screen corresponding to the input command. The input unit 920 may include a plurality of buttons or knobs provided in the control panel 14. In addition, the output unit 930 may include a display 141 of the control panel 14.

The washing machine 1 may include a memory 940. In the memory 940, a first motor RPM, which is a rotational speed (motor RPM) of the motor 30, may be stored in advance according to a dehydration stroke level. In addition, the second motor RPM, which is smaller than the first motor RPM and is a rotational speed for balanced rotation (balancing) of the drum 20, may be stored in the memory 940 in advance. In addition, the memory 940 may include a resonance RPM formed between the first motor RPM and the second motor RPM. Alternatively, the memory 940 may include a resonance band in which resonance RPM values are collected between the first motor RPM and the second motor RPM.

On the other hand, the dehydration administration level may be composed of a plurality. In addition, any one of the plurality of dehydrating administrative levels may be set by a user's command. That is, the dehydration level may be set based on a command input to the user's input unit 920. The higher the dewatering stroke level is input, the higher the rotational speed of the motor 30 can be.

As another example, the washing machine 1 may be provided with a weight sensor (not shown) for measuring the weight of the laundry in the drum (20). The dehydration stroke level may be set based on a value measured by the weight sensor. The heavier the weight of the laundry inside the drum 20, the higher the RPM of the motor 30 may be set. The dehydration level may be divided into a set number of steps. For example, the dehydration stroke may be divided into five levels. In addition, the RPM of the motor 30 may be set to increase in proportion to the dehydration stroke level. For example, the motor RPM of the first-level dehydrating stroke may be the smallest value, and the motor RPM of the five-level dehydrating stroke may be the largest value.

In the present specification, since the dehydration stroke level determines the output of the motor, it may be referred to as an output level of the motor.

On the other hand, the memory 90, in the product design process, the resonance RPM for preventing the vibration amount of the cabinet 10 to be higher than the set level may be stored in advance. The resonance RPM may be set based on the input dewatering level.

In the present specification, the resonant RPM may be referred to as a critical speed or a critical speed.

In addition, the resonance RPM may be set in the memory 90 according to each level of dehydration operation. At this time, the motor RPM of each level may be set smaller than the resonance RPM of each level. Therefore, it is possible to reduce the phenomenon that vibration occurs in the cabinet 10 during the dehydration stroke.

The washing machine 1 may further include a controller 990 that controls the rotation speed (motor RPM) of the motor 30 based on the input dehydration stroke level. The controller 990 may control the rotation speed of the motor 30 based on the dehydration stroke level input from the input unit 920. Alternatively, the control unit 990 may perform the dehydration operation with the motor RPM corresponding to the weight of the laundry. In this case, the controller 990 may refer to the rotational speed of the motor 30 according to the dehydration stroke level previously stored in the memory 940.

In addition, the controller 990 may update the resonance RPM set in the memory 940 based on the amount of vibration measured by the vibration sensor 60. For example, the controller 990 may drive the motor 30 at a rotation speed corresponding to the five-level dehydration stroke. The controller 990 may be driven by a motor RPM corresponding to the set 5-level dehydration stroke. In addition, the controller 990 may control the vibration sensor 60 to monitor the vibration amount of the cabinet 10 generated in the dehydration process.

On the other hand, the control unit 990 may recognize that the vibration amount of the current cabinet 10 is an abnormal level, that is, abnormal vibration state, when the vibration amount measured by the vibration detection sensor 60 is greater than a preset vibration amount. The abnormal vibration state may be understood as a vibration state of the cabinet 10 in which excessive noise is generated and which may cause endurance loss of the product. In this case, the controller 990 may delete the resonance RPM information previously stored in the memory 990 and store the current motor RPM as a new resonance RPM. In other words, when it is recognized that the amount of vibration currently measured is greater than a preset amount of vibration, the controller 990 may update the motor RPM corresponding to the currently measured vibration amount to the resonance RPM of the corresponding dehydration level. . The motor RPM of the corresponding dehydrating stroke level may be reset (or updated) by the amount of change in the resonance RPM before and after the update.

According to the above configuration, since the resonance RPM can be varied according to the amount of vibration currently measured, vibration and noise are generated due to the influence of external environmental factors such as the state of the floor where the washing machine is installed and the installation skill of the serviceman. Can be reduced. In addition, even if the state of the floor is variable due to the cumulative operating time of the washing machine for a long time, since the resonant RPM can be continuously updated, the maintenance requirements are reduced, as well as the user's convenience is improved.

[Control Method of Washing Machine to Reduce Vibration in Dewatering Administration]

4 is a flowchart illustrating a control method of a washing machine for reducing vibration according to an embodiment.

3 and 4, the dehydration administration level may be input to the controller 990 (S11). For example, the dehydration level may be input from the user through the input unit 920. As another example, the dehydration level may be automatically input by the weight sensor.

The control unit 990 may drive the motor 30 with a motor RPM corresponding to the input dehydrating stroke level (S13). In detail, the controller 99 may drive the motor 30 with the first motor RPM corresponding to the input dehydrating stroke level. When the set time has elapsed, the motor 30 may be driven by a second motor RPM smaller than the first motor RPM.

The controller 990 may control the vibration detection sensor 60 to monitor the vibration amount of the casing 10 generated during the dehydration stroke process (S15 and S29). The controller 990 may compare the measured vibration amount measured by the vibration sensor 60 with a preset vibration amount previously stored in the memory 940.

When the measured vibration amount is larger than the set vibration amount, the controller 990 may store the current motor RPM as a temporary RPM (or a reserve speed) (S17). At this time, the temporary RPM and the current dehydration administration level may be stored together.

The controller 990 may decelerate the second motor RPM of the motor 30 by the set RPM (or set speed) (S19). The set RPM may be, for example, 50 RPM.

The controller 990 may monitor whether the measured vibration amount measured by the vibration sensor 60 during the second set time exceeds the set vibration amount (S21). The second set time may be understood as the time remaining until the dehydration stroke is completed.

If it is recognized that the measured vibration amount exceeds the set vibration amount during the second set time, the control unit 990 currently transmits the temporary RPM stored in the memory 940 in step S17 in the vibration detection sensor 60. The motor RPM may be updated to correspond to the measured vibration amount.

On the other hand, if it is recognized that the measured vibration amount does not exceed the set vibration amount during the second set time, the control unit 990 can check whether the operation number of the washing machine 1 has reached the set number of times (S23). The operation frequency may be understood as the number of times a dehydration stroke of the washing machine 1 is performed. And the setting frequency may be 30 times, for example.

When it is recognized that the driving frequency of the washing machine 1 has reached the set number of times, the controller 990 may calculate a new resonance RPM based on the temporary RPMs stored in the memory 940 (S25). The controller 990 may load a temporary RPM stored for a set number of times from the memory 940. The controller 990 may calculate an average value based on the temporary RPMs stored during the set number of times. In this case, the temporary RPMs to be calculated as the average value may be motor RPMs for the same dehydration stroke level. The controller 990 may update the average value with a new resonance RPM. The setting frequency may be 30 times, for example.

The controller 990 may update (or reset) the second motor RPM with respect to the input dewatering level based on the change amount of the resonance RPM. The controller 990 may update the second motor RPM with respect to the dehydration stroke level in proportion to the change amount of the resonance RPM. For example, the change amount of the resonance RPM may be 300 RPM, the first motor RPM of the motor 30 is 2400 RPM, and the second motor RPM may be 1800 RPM with respect to the input dewatering first level. In this case, the controller 990 may vary the second motor RPM to 1500 RPM while maintaining the first motor RPM.

The control unit 990 may drive the motor 30 with the updated second motor RPM until the dehydration stroke is completed (S29, S13). In addition, the control unit 990 may monitor the abnormal vibration of the cabinet 10 while repeating steps S13 to S29, and may proceed with dehydration of the washing machine 1 in a direction of reducing vibration.

According to the present embodiment, when abnormal vibration is detected in the dehydration process, the controller 990 of the washing machine 1 decelerates the rotation speed of the motor 30, thereby reducing vibration and noise.

In addition, the controller 990 may reduce the resonance RPM corresponding to the input dehydration node level when the abnormal vibration is detected in the dehydration process. The controller 990 may reduce the second motor RPM corresponding to the dehydration stroke level in proportion to the reduced resonance RPM. Therefore, when the next washing operation of the washing machine 1, the phenomenon that the motor 30 enters the resonance band can be reduced. In addition, the resonance RPM set during the product design process may be changed to a resonance RPM suitable for various installation environments.

In addition, the controller 990 records the motor RPMs when the abnormal vibration is detected in the dehydration process for a set number of times, and calculates an average value using the motor RPMs. The controller 990 may update the calculated average value with a new resonance RPM. The controller 990 may update the second motor RPM corresponding to the dehydration process by using the change amount of the resonance RPM. Therefore, even if the installation environment (the inclination of the bottom surface or the state of the product (inclination)) of the washing machine 1 is varied according to the accumulation of operating time, the motor 30 enters the resonance band to suppress vibration and noise. It can reduce the phenomena causing.

Hereinafter, another embodiment is proposed.

When the serviceman first installs the washing machine 1 in the installation environment of the user, the resonance RPM may be set according to the installation environment of the user. In detail, the serviceman may set the resonance RPM in the washing machine 1 after completing the installation of the washing machine 1 in the installation environment of the user. By the serviceman, the input unit 920 may enter a 'resonant RPM setting mode (or limit speed setting mode)'.

When the resonance RPM setting mode is input, the controller 990 may receive a dehydration administrative level. For example, the dehydration level may be composed of five steps. In addition, the first motor RPM, the second motor RPM, and the resonance RPM may be stored in the memory 940 in advance in each dehydration step of each step.

The controller 990 may drive the motor 30 on the basis of the input dehydration stroke level. The control unit 990 may monitor whether the cabinet 10 has an abnormal vibration state through the vibration detection sensor 60.

When the abnormal vibration is recognized, the controller 990 may update the current motor RPM to the resonance RPM in the memory 940. Of course, as described in the previous embodiment, it is also possible to repeat the dehydration operation for a set number of times, and to update the average value calculated based on the motor RPMs in which the abnormal vibration has occurred during the set number of times to the resonance RPM.

According to this embodiment, it is possible to set the resonance RPM of the washing machine 1 suitable for the installation environment of the user. Therefore, there is an advantage that can provide an improved installation service to the user.

In addition, according to the present embodiment it is possible to reduce the phenomenon of the vibration and noise generated in the washing machine 1 due to external factors such as the slope of the bottom surface, the assembled state of the washing machine, the installation skill of the serviceman.

1: washing machine 10: cabinet
13: door 20: drum
30: motor 31: drive shaft
40: Tub 45: Balancer
60: vibration detection device 910: power supply
920: input unit 930: output unit
940: memory 990: control unit

Claims (14)

cabinet;
A tub accommodated in the cabinet;
A drum rotatably provided in the tub;
A motor installed in the tub and providing rotational power to the drum through a horizontal axis passing through the drum;
A vibration sensor installed in the cabinet and measuring a vibration amount of the cabinet;
A memory storing a set vibration amount for determining abnormal vibration of the cabinet; And
And a controller configured to determine the abnormal vibration of the cabinet by comparing the measured vibration amount and the set vibration amount.
The control unit, when it is determined that abnormal vibration occurs in the cabinet, the washing machine characterized in that to reduce the rotational speed of the motor.
The method of claim 1,
The control unit,
And when the measured vibration amount is greater than the set vibration amount, determining that abnormal vibration has occurred in the cabinet.
The method of claim 1,
Further comprising an input unit for inputting the output level of the motor,
And a first speed that is a rotational speed corresponding to the output level of the motor, a limit speed at which the abnormal vibration is expected to occur, and a second speed smaller than the limit speed.
The method of claim 3, wherein
The control unit,
When the output level of the motor is input through the input unit, the motor is driven at the first speed, and when the set time has elapsed, the washing machine characterized in that for decelerating the motor at the second speed.
The method of claim 4, wherein
The controller, when the abnormal vibration is recognized in the process of driving the motor at the first rotational speed,
Washing machine, characterized in that for reducing the threshold speed by a set speed, the second speed in proportion to the amount of change of the threshold speed.
The method of claim 3, wherein
The control unit,
And if it is determined that abnormal vibration has occurred in the cabinet, storing the rotational speed of the motor at the time when the abnormal vibration occurs in a memory.
The method of claim 6,
The control unit,
When the rotational speed of the motor at the time when the abnormal vibration occurs is stored a set number of times, the average value for the stored rotational speed of the motor is calculated, and the washing machine, characterized in that for updating the memory with the average value as the threshold speed .
The method of claim 7, wherein
The control unit,
Washing machine, characterized in that for changing the second speed in proportion to the change in the threshold speed.
The method of claim 1,
Washing machine further comprises a balancer to compensate for the eccentricity of the drum.
The method of claim 9,
The balancer is disposed in front of the drum, characterized in that disposed along the outer peripheral surface of the drum.
Inputting a dehydration stroke level;
Driving the motor at a rotation speed corresponding to the dehydration stroke level;
Monitoring the cabinet for abnormal vibration; And
If it is determined that abnormal vibration occurs in the cabinet, the control method of the washing machine comprising the step of reducing the rotational speed of the motor.
The method of claim 11, wherein the monitoring of the abnormal vibration of the cabinet comprises:
Comparing the vibration amount and the set vibration amount of the cabinet;
And if it is recognized that the vibration amount of the cabinet is greater than the set vibration amount, the control unit includes determining that abnormal vibration has occurred in the cabinet.
The method of claim 11, wherein the decelerating the rotation speed of the motor comprises:
Decelerating the speed limit corresponding to the input dehydration stroke level by the set speed;
The control method of the washing machine comprising the step of decelerating the rotational speed of the motor in proportion to the change amount of the threshold speed.
The method of claim 11, wherein the decelerating the rotation speed of the motor comprises:
Storing the rotational speed at the time when the abnormal vibration is generated in the memory for a set number of times;
Calculating an average value of the rotation speeds stored in the memory;
Updating the calculated mean value with a new limit speed;
And controlling the rotation speed of the motor in proportion to the change amount of the speed limit.

Images