WO2019182244A1

WO2019182244A1 - Washing machine

Info

Publication number: WO2019182244A1
Application number: PCT/KR2019/001452
Authority: WO
Inventors: 이병기; 왕세명; 이규호; 이근상; 이승수; 조성문; 조영은
Original assignee: 엘지전자 주식회사; 광주과학기술원
Priority date: 2018-03-23
Filing date: 2019-02-01
Publication date: 2019-09-26
Also published as: KR102497295B1; KR20190111692A

Abstract

A washing machine is disclosed. A washing machine according to an embodiment of the present invention comprises: a cabinet which forms the outer appearance of the washing machine; a motor which generates a driving force; a drum which receives laundry and is rotated by the motor; and an active sound absorber which absorbs noise generated in the cabinet, through impedance matching with an acoustic impedance of air in the cabinet.

Description

washer

The present invention relates to a washing machine equipped with an active sound absorber, which absorbs noise generated inside the washing machine through impedance matching with acoustic impedance of air inside the washing machine.

In general, a washing machine is a device that cleans through a process such as washing, rinsing, and dehydrating to remove contaminants on clothes, bedding, etc. using water, detergent, and mechanical action.

The washing machine can be roughly divided into a pulsator washing machine, an agitator washing machine, and a drum washing machine according to a washing principle. In addition, depending on the position of the laundry in the washing machine may be divided into a top loading method and a front loading method.

In general, pulsator washing machines and agitator washing machines are top-loading, and drum washing machines are front-loading.

Meanwhile, a motor is installed inside the washing machine, and the laundry is washed by the rotation of the motor.

As an example of a drum washing machine, the drum washing machine includes a cabinet forming an exterior, a tub installed inside the cabinet to store water, and a drum rotatably installed inside the tub and rotating by receiving a rotational force of a motor. do. Then, the laundry and laundry are put together with the detergent inside the tub, and the drum is rotated to physically impact the laundry to wash the laundry.

In this way, since the laundry is washed by the rotation of the motor, noise due to rotation is inevitably generated. And this noise is transmitted to the outside will cause inconvenience to the user.

Background Art In order to reduce the noise flowing out of a drum washing machine, a background music (BGM) or active noise cancellation (ANC) technique is applied.

However, the BGM technique may have a masking effect, but may cause a problem in that the actual sound pressure is increased, and the ANC technique has a limitation in that a noise reduction effect appears only around an error microphone.

Therefore, ultimately, there is a need for a technique on how to reduce noise as a whole.

An object of the present invention is to provide a washing machine equipped with an active sound absorber, which absorbs the noise generated inside the washing machine through impedance matching with the acoustic impedance of the air inside the washing machine.

Washing machine according to an embodiment of the present invention, the cabinet forming the appearance of the washing machine, a motor for generating a driving force, the laundry is accommodated, the drum rotated by the motor, and the impedance with the acoustic impedance of the air in the cabinet It includes an active sound absorber that absorbs the noise generated inside the cabinet through the matching.

Since the present invention takes a method of absorbing noise incident to the diaphragm through impedance matching, it is possible to reduce the sound pressure inside the washing machine, and to reduce the overall noise inside the washing machine as well as around an error microphone. There is this.

In addition, the present invention, by placing the active intake in the vertex area of the base panel or the vertex area of the top panel, and the active absorber toward the adjacent panel, it is possible to maximize the noise reduction effect and utilization of the interior space of the cabinet There is this.

In addition, when the opening is formed in the cabinet, the opening may be a main passage through which noise flows out. Therefore, the present invention has the advantage of efficiently reducing the noise flowing to the outside by arranging the active intake air in the base panel in which the opening is formed.

In addition, the main cause of the noise generated inside the cabinet may be the driving of the motor. Therefore, the present invention has an advantage of reducing noise at a position close to the noise source by disposing an active intake air in the base panel located closer to the motor among the top panel and the base panel.

In addition, due to the shape of the inside of the washing machine in the form of a cuboid, acoustic energy is often symmetrically distributed inside the washing machine. Therefore, the present invention has an advantage that the noise inside the washing machine can be efficiently reduced by symmetrically arranging even-numbered loudspeakers.

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

2 is a side cross-sectional view of the washing machine W according to an embodiment of the present invention.

3 is a block diagram illustrating an active sound absorber 300 according to an embodiment of the present invention.

4 is a plan view of the washing machine W, which is a view for explaining a position where the speaker 340 is disposed.

5 is a view for explaining an arrangement direction of the loudspeaker 340 according to an embodiment of the present invention.

6A and 6B are diagrams for describing various directions in which the loudspeaker 340 may be disposed according to an exemplary embodiment of the present invention.

FIG. 7 is a diagram for describing a plurality of active intake machines in which laundry is mounted therein according to an embodiment of the present disclosure.

8 is a diagram showing the distribution of acoustic energy inside the cabinet 1.

9 is a graph showing results of simulating noises when the active intake air is driven and when it is not driven.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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

The washing machine according to the embodiment of the present invention may be a drum washing machine.

The washing machine W according to the embodiment of the present invention may include a cabinet 1, a motor 205, and a drum 224.

The cabinet 1 may form an appearance of the washing machine W.

The cabinet 1 includes a front panel 212 forming a front side of the cabinet 1, a back panel 216 forming a rear side of the cabinet 1, and a first side panel forming a left side of the cabinet 1 ( 220, the second side panel 222 forming the right side of the cabinet 1, the base panel 218 forming the bottom side of the cabinet 1, and the top panel 214 forming the top side of the cabinet 1. It may include.

The opening H may be formed in the center of the base panel 218.

Meanwhile, the washing machine W may include a tub 222. The tub 222 may be installed inside the cabinet 1 to store wash water.

The drum 224 is rotatably installed in the tub 222 and may accommodate laundry. In addition, the drum 224 may rotate by the driving force of the motor 205.

The motor 205 is connected to the drum 224 and may generate a driving force to rotate the drum 224.

Meanwhile, in FIG. 2, the motor 205 is positioned below the drum 224 and the driving force is transmitted to the drum 224 by a belt. However, the present disclosure is not limited thereto, and the motor 225 may be located at the rear of the drum 224. The shaft axially connected to the drum 224 may transmit a driving force to the drum 224.

Meanwhile, a spring, a damper, or the like may be installed between the cabinet 1 and the tub 220 in order to reduce vibration generated by the rotation of the motor.

In addition, a door 207 may be installed at the front of the cabinet 1 to draw in and take out laundry such as clothes.

The washing machine W according to an embodiment of the present invention absorbs acoustic energy inside the cabinet 1, that is, noise generated inside the cabinet 1, through impedance matching with acoustic impedance of air inside the cabinet 1. An active sound absorber 340 may be included.

The active sound absorber 340 may include a sensing unit 310, a controller 320, an amplifier 330, and a loudspeaker 340.

The loudspeaker 340 may include a diaphragm 341 that generates sound by vibrating by an electrical signal.

The sensing unit 310 may measure acoustic properties around the diaphragm 341 of the speaker 340. The acoustic properties may include sound pressure and flow velocity.

In detail, the sensing unit 310 may include a sound pressure sensor 311 and a speed sensor 312.

The sound pressure sensor 311 may measure the sound pressure.

And the speed sensor 312 can measure the flow rate of air.

However, the present invention is not limited thereto, and the speed sensor 312 may indirectly measure the flow rate of air by measuring the speed of the loudspeaker diaphragm instead of measuring the flow rate of air, and this method may be easier to implement.

The controller 320 may control the acoustic impedance of the loudspeaker to match the acoustic impedance of the air in the cabinet 1, which is an acoustic medium.

In detail, the controller 320 uses an acoustic property measured by the sensing unit 310 to provide an impedance control signal for matching the acoustic impedance of the loudspeaker 340 with the acoustic impedance of air in the cabinet 1. You can print

In this case, the controller 320 may use a direct impedance control (DIC) technique for matching impedance by using the sound pressure sensed by the sound pressure sensor 311 and the flow velocity of air sensed by the speed sensor 312.

Meanwhile, the amplifier 330 may amplify the impedance control signal and output the amplified control signal to the loudspeaker.

In this case the loudspeaker will act as an electroacoustic absorber (EA). Accordingly, the loudspeaker (more specifically, the diaphragm 341 of the loudspeaker) may absorb acoustic energy (noise) inside the cabinet 1.

On the other hand, the diaphragm 341 may be located at the front of the speaker 340, and may absorb acoustic energy (noise) inside the cabinet 1 through the front of the speaker 340.

Meanwhile, referring again to FIG. 2, the speaker 340 may be disposed inside the cabinet 1 to absorb acoustic energy (noise) inside the cabinet 1.

In addition, the sound pressure sensor 311 and the speed sensor 312 included in the sensing unit 310 may be disposed in front of the speaker 340 to detect the sound pressure and the flow velocity around the diaphragm 341.

On the other hand, the present embodiment is not limited to the impedance matching by the DIC technique using the sound pressure sensor and the speed sensor, but also includes matching the impedance by a semi-active technique such as a shunt circuit (shunt circuit).

On the other hand, impedance matching is possible in an active sound absorber by using a speed estimator instead of a speed sensor.

In this case, a method using the back-EMF generated from the electrical circuit inside the speaker, a method of estimating the speed based on the Lorentz force generated by the current signal and the mechanical impedance of the speaker, and a paper impedance instead of the mechanical impedance Based on the disturbance observer type velocity estimator (distrunbacne-observer-type velocity estimator) may be used.

4 to 7 are views for explaining a method of arranging the speaker 340 included in the active sound absorber 300 according to an embodiment of the present invention.

The cabinet 1 includes a front panel 212 forming a front side of the cabinet 1, a back panel 216 forming a rear side of the cabinet 1, and a first side panel forming a left side of the cabinet 1 ( 220, a second side panel 220 forming a right side of the cabinet 1, a base panel 218 forming a bottom of the cabinet 1, and a top panel forming an upper surface of the cabinet 1 (not shown). It may include.

An opening H may be formed at the center of the base panel 218 forming the lower surface of the cabinet 1. The opening H may be a main passage through which noise inside the washing machine flows out of the washing machine.

In this case, the loudspeaker 340 may be disposed above the base panel 218 where the opening H is formed.

Here, the meaning that the loudspeaker 340 is disposed above the base panel 218 may mean that the loudspeaker 340 is mounted on the top surface of the base panel 218.

However, the present invention is not limited thereto, and the loudspeaker 340 may be spaced apart from an upper surface of the base panel 218 and disposed in a space between the base panel 218 and the drum 224.

In this case, the loudspeaker 340 is formed of the base panel 218, the first side panel 220, the second side panel 222, the front panel 212, and the back panel 216 through a fastening member (not shown). It can be fixed by connecting to at least one.

On the other hand, for example, when the loudspeaker 340 is mounted on the upper surface of the base panel 218, the position where the loudspeaker 340 is installed will be described.

The top surface of the base panel 218 may include a plurality of

vertex regions

411, 412, 413, and 414 and a plurality of

corner regions

421, 422, 423, and 424.

In this case, the plurality of

vertex areas

411, 412, 413, and 414 may be areas including vertices of the base panel 218 having a quadrangular shape.

In addition, the plurality of

corner regions

421, 422, 423, and 424 may be regions respectively located between two vertex regions.

For example, the first vertex area 411 may be an area including the first vertex of the rectangular base panel, and the second vertex area 412 is an area including the second vertex of the rectangular base panel Can be. The first corner region 421 may be located between the first vertex region 411 and the second vertex region 412. In addition, a fourth corner region 424 may be located between the first vertex region 411 and the third vertex region 413.

Meanwhile, the plurality of

vertex regions

411, 412, 413, and 414 and the plurality of

corner regions

421, 422, 423, and 424 may be divided by extension lines of the opening H.

For example, the first vertex region 411 may be distinguished from the first corner region 421 by the first extension line 431 and the fourth corner region 424 by the second extension line 432. .

As another example, the second vertex region 412 may be separated from the first corner region 421 by the third extension line 433 and from the second corner region 422 by the fourth extension line 434. have.

Meanwhile, the loudspeaker 340 may be disposed in any one of the plurality of

vertex areas

411, 412, 413, and 414.

For example, the loudspeaker 340 may be disposed in the first vertex region 411 among the plurality of

vertex regions

411, 412, 413, and 414.

Meanwhile, the meaning that the loudspeaker 340 is disposed at any one vertex region means that not only the entire loudspeaker 340 is located at any one vertex region, but also a part of the loudspeaker 340 It may mean to be located in the vertex area.

For example, the fact that the loudspeaker 340 is disposed in the first vertex region 411 means that the entire loudspeaker 340 is located in the first vertex region 411 as shown in FIG. 4. In some embodiments, only a part of the loudspeaker 340 may be located in the first vertex area 411. For example, when the loudspeaker 340 is large in size, the loudspeaker 340 is positioned across the first vertex region 411, the first corner region 421, the fourth corner region 424, and the opening H. You may.

Meanwhile, when the loudspeaker 340 is spaced apart from an upper surface of the base panel 218, the loudspeaker 340 may be disposed in any one region overlapping the plurality of

vertex regions

411, 412, 413, and 414.

5 is a view for explaining an arrangement angle of the loudspeaker 340 according to an embodiment of the present invention.

The loudspeaker 340 may be disposed in parallel with the top surface of the base panel 218. That is, the loudspeaker 340 may be disposed to face in the horizontal direction.

On the other hand, the direction (d1) facing the front surface of the loudspeaker 340 described below may be a direction facing the front of the loudspeaker 340 orthogonal to the front surface 341 of the loudspeaker 340.

The cabinet 1 includes a front panel 212 forming a front side of the cabinet 1, a back panel 216 forming a rear side of the cabinet 1, and a first side panel forming a left side of the cabinet 1 ( 220, a second side panel 222 forming a right side surface of the cabinet 1 may be included.

In this case, the front surface 341 of the loudspeaker 340 may face at least one of two panels adjacent to the loudspeaker 340.

For example, referring to FIG. 5, the loudspeaker 340 is disposed in the first vertex region 411. In this case, two panels adjacent to the loudspeaker 340 among the front panel 212, the back panel 216, the first side panel 220, and the second side panel 222 may include the first side panel 220 and It may be the front panel 212.

In this case, the front surface 341 of the loudspeaker 340 may face at least one of the first side panel 220 and the front panel 212 adjacent to the loudspeaker 340.

As another example, when the loudspeaker 340 is disposed in the second vertex region 412, the front surface 341 of the loudspeaker 340 may include the first side panel 220 and the back panel adjacent to the loudspeaker 340. May face at least one of 216.

More specifically, the front surface 341 of the loudspeaker 340 may face the included angle θ of the longitudinal extension line 511 and the horizontal extension line 512 from the position of the loudspeaker 340.

In this case, the centers of the left and right widths of the front surface 341 of the loudspeaker 340 may face the vertices included in the vertex region where the loudspeaker 340 is disposed.

For example, when the loudspeaker 340 is disposed in the first vertex region 411, the center of the left and right widths of the front surface 341 of the loudspeaker 340 is the first vertex region in which the loudspeaker 340 is disposed. 411 may face the first vertex 441 included.

The front 341 of the loudspeaker 340 may face at least one of two panels adjacent to the loudspeaker 340.

In this case, as shown in FIG. 6A, the front surface 341 of the loudspeaker 340 may face only one of the two

panels

212 and 220 adjacent to the loudspeaker 340, and FIG. 6B. As shown in FIG. 3, the front surface 341 of the loudspeaker 340 may face only the other panel 220 of the two

panels

212 and 220 adjacent to the loudspeaker 340.

Meanwhile, the loudspeaker 340 is described to be disposed in a horizontal direction, but the present invention is not limited thereto.

In detail, the cabinet 1 includes a front panel 212 forming a front surface of the cabinet 1, a back panel 216 forming a rear surface of the cabinet 1, and a first side forming a left side surface of the cabinet 1. The panel 220, the second side panel 222 forming the right side of the cabinet 1, the base panel 218 forming the bottom side of the cabinet 1, and the top panel 214 forming the top surface of the cabinet 1. ) May be included.

In this case, the loudspeaker 340 may be disposed to face at least one of the three adjacent panels.

For example, when the loudspeaker 340 is disposed horizontally, the loudspeaker 340 may face the front panel 212 of three adjacent panels as shown in FIG. 6A.

In another example, when the loudspeaker 340 is disposed horizontally, the loudspeaker 340 may face the first side panel 220 of three adjacent panels as shown in FIG. 6B.

In another example, when the loudspeaker 340 is disposed horizontally, the loudspeaker 340 may face the front panel 212 and the first side panel 220 among three adjacent panels as shown in FIG. 5. Can be.

As another example, the loudspeaker 340 may be disposed in an area overlapping the first area 411 and may not be horizontally disposed. In more detail, the loudspeaker 340 may be disposed to face the included angle of the vertical extension line and the horizontal extension line from the position of the loud speaker 340. In this case, the loudspeaker 340 faces the base panel 218 and the front panel 212 of the three

adjacent panels

212, 220, 218, or faces the base panel 218 and the first side panel 220. Or, it may face the base panel 218 and the front panel 212 and the first side panel 220.

In another example, when the loudspeaker 340 is disposed vertically, the loudspeaker 340 may face the base panel 218 of three adjacent panels.

The washing machine W may include a plurality of active intakes. In FIG. 7, it is assumed that two active intake units are installed.

The washing machine W may further include a second active intake air. Herein, the description of the active intake 300 described above may be applied to the second active inhaler as it is.

Meanwhile, the second active intake unit may include a second loudspeaker 750.

The second loudspeaker 750 may be disposed in a vertex area 414 that is different from the vertex area 411 where the loudspeaker 340 is disposed among the

vertex areas

411, 412, 413, and 414.

In addition, the description of the arrangement direction of the loudspeaker 340 described above may be applied to the second loudspeaker 750.

For example, the front surface of the second loudspeaker 750 may face at least one of the two

panels

212 and 222 adjacent to the second loudspeaker 750.

In addition, the front surface of the second loudspeaker 750 may face the sandwiched angle θ of the front and rear extension lines 711 and the left and right extension lines 712 from the position of the second loudspeaker 750.

In addition, a center of the left and right widths of the front surface of the second loudspeaker 750 may face a vertex 443 included in the vertex region 414 where the second loudspeaker 750 is disposed.

In addition, the second loudspeaker 750 may be disposed to face at least one of the three

adjacent panels

212, 222, and 218.

In detail, when the second loudspeaker 750 is horizontally disposed, the second loudspeaker 750 faces the front panel 212 of three

adjacent panels

212, 222, and 218, or the second side panel ( 222, or may face the front panel 212 and the second side panel 222.

In addition, when the second loudspeaker 750 is disposed to face the included angles of the vertical extension line and the horizontal extension line from the position of the second loudspeaker 750, the second loudspeaker 750 may include three adjacent panels 212, Towards base panel 218 and front panel 212, towards base panel 218 and second side panel 222, or between base panel 218 and front panel 212 and second of 222, 218. 2 may face the side panel 222.

In another example, when the second loudspeaker 750 is disposed vertically, the second loudspeaker 750 may face the base panel 218 of three adjacent panels.

On the other hand, when a plurality of active intake air is included, the washing machine W may include an even number of active intake air. For example, the washing machine W may include two or four active sound absorbers.

And even-numbered active intake may be arranged symmetrically with each other, depending on the distribution form of the sound pressure energy inside the washing machine (W).

On the other hand, from above, the loudspeaker 340 or the plurality of

loudspeakers

340 and 750 may be mounted on the base panel 218 having the openings among the base panel 218 and the top panel 214, or the base panel having the openings ( 218).

However, the present invention is not limited thereto, and the loudspeaker 340 or the plurality of

loudspeakers

340 and 750 may be mounted on a panel close to the motor 205 of the base panel 218 and the top panel 214, or may be mounted on the motor 205. It can be placed in close proximity to the near panel.

For example, if the base panel 218 of the base panel 218 and the top panel 214 is closer to the motor 205, the loudspeaker 340 or the plurality of

loudspeakers

340, 750 may be the base panel 218. It may be mounted on the upper surface of the) or spaced apart from the upper surface of the base panel 218 in the space between the base panel 218 and the drum 224.

In another example, when the top panel 214 of the base panel 218 and the top panel 214 is closer to the motor 205, the loudspeaker 340 or the plurality of

loudspeakers

340 and 750 may be a top panel ( It may be mounted on the bottom surface of the 214 or spaced apart from the bottom surface of the top panel 214 and disposed in the space between the top panel 214 and the drum 224.

Meanwhile, when the loudspeaker 340 or the plurality of

loudspeakers

340 and 750 are mounted on the bottom surface of the top panel 214 or spaced apart from the bottom surface of the top panel 214, the vertex areas 411 described with reference to FIG. 412, 413, and 414 may be disposed in an overlapping area. In addition, the above description about the installation direction of the loudspeaker may be applied.

Meanwhile, although the plurality of loudspeakers are described as being disposed on any one of the base panel 218 and the top panel 214, the present invention is not limited thereto. The plurality of loudspeakers may include the base panel 218 and the top panel 214. ) May be disposed.

In FIG. 8, the stronger the sound pressure energy, the closer the red color, and the weaker the sound pressure energy, the closer the blue color.

According to FIG. 8, it can be seen that due to the phenomenon caused by the large amount of acoustic energy in the corner, the sound pressure energy appears strongly in the region close to the corner of the cabinet 1.

Accordingly, the present invention, by placing the active intake in the vertex area of the base panel or the vertex area of the top panel, and the active absorber toward the adjacent panel, it is possible to maximize the noise reduction effect and utilization of the space inside the cabinet (1) There are advantages to it.

In addition, when the opening is formed in the cabinet 1, the opening may be a main passage through which noise flows out. Therefore, the present invention has the advantage of efficiently reducing the noise flowing to the outside by arranging the active intake air in the base panel in which the opening is formed.

In addition, the main cause of the noise generated inside the cabinet 1 may be the driving of the motor. Therefore, the present invention has an advantage of reducing noise at a position close to the noise source by disposing an active intake air in the base panel located closer to the motor among the top panel and the base panel.

In addition, since the present invention adopts a method of absorbing noise incident to the diaphragm 341 through impedance matching, the sound pressure inside the washing machine can be reduced, and the overall noise inside the washing machine as well as around the error microphone can be reduced. There is an advantage to this.

9A is a graph of the average sound pressure at the total volume inside the cabinet 1, and FIG. 9B is a graph of the sound pressure at the target point T (1 m in front of the washing machine and 1 m above ground).

In addition, the solid line is a graph when the active intake air is not applied, and the dotted line is a graph when the active sound absorber is applied.

9A and 9B, the result of applying the active sound absorber inside the drum washing machine cabinet (dashed line) is a damping effect at the resonance peak compared to the result of otherwise (solid line), and shows a sound pressure reduction effect. You can be sure that.

In addition, this phenomenon, it can be seen that the same phenomenon occurs in the results derived from the interior and exterior points.

The present invention described above can be embodied as computer readable codes on a medium in which a program is recorded. The computer-readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable media include hard disk drives (HDDs), solid state disks (SSDs), silicon disk drives (SDDs), ROMs, RAMs, CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like. It includes. In addition, the computer may include a controller of a display device. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims

In the washing machine,

A cabinet forming an exterior of the washing machine;

A motor for generating a driving force;

A drum accommodating laundry and rotating by the motor; And

And an active sound absorber that absorbs noise generated in the cabinet through impedance matching with acoustic impedance of air in the cabinet.

washer.
The method of claim 1,

The active intake unit,

A loudspeaker disposed in the cabinet;

Sensing unit for sensing the acoustic properties in the cabinet;

A controller for outputting an impedance control signal for matching the acoustic impedance of the loudspeaker with the acoustic impedance of the air by using the acoustic properties; And

It includes; an amplifier for amplifying the impedance control signal;

washer.
The method of claim 2,

The cabinet,

A base panel forming a bottom surface of the cabinet and including an opening;

The loud speaker,

Disposed above the base panel

washer.
The method of claim 3, wherein

The upper surface of the base panel,

A plurality of vertex regions each including a vertex of the base panel and a plurality of corner regions respectively located between the two vertex regions,

The plurality of vertex areas and the plurality of corner areas,

Divided by extension lines of the openings,

The loud speaker,

Disposed in any one of the plurality of vertex regions

washer.
The method of claim 3, wherein

The cabinet,

A first side panel and a second side panel forming a side surface of the cabinet, a front panel forming a front surface of the cabinet, and a back panel forming a rear surface of the cabinet,

The front of the loudspeaker,

Facing at least one of the two panels adjacent to the loudspeaker

washer.
The method of claim 5,

The front of the loudspeaker,

From the position of the loudspeaker toward the included angle of the longitudinal extension line and the horizontal extension line

washer.
The method of claim 4, wherein

The center of the left and right width of the front of the loudspeaker,

To face a vertex that includes a vertex area in which the loudspeaker is disposed

washer.
The method of claim 4, wherein

Further comprising a second active sound absorber comprising a second loudspeaker,

The second loudspeaker,

It is disposed in a vertex area different from the vertex area where the loudspeaker is arranged among the plurality of vertex areas

washer.
The method of claim 8,

The cabinet,

A first side panel and a second side panel forming a side surface of the cabinet, a front panel forming a front surface of the cabinet, and a back panel forming a rear surface of the cabinet,

The front of the second loudspeaker,

Facing at least one of two panels adjacent to the second loudspeaker

washer.
The method of claim 2,

The cabinet,

A base panel forming a lower surface of the cabinet and a top panel forming an upper surface of the cabinet;

The loud speaker,

Mounted on a panel close to the motor among the base panel and the top panel;

washer.