KR20190090930A - Sensing stator and motor having the same - Google Patents

Abstract

An embodiment of the present invention relates to a sensing magnet assembly and a motor. The sensing magnet assembly comprises: a plate; a magnet arranged on the plate and having a hole; and an adhesive member arranged between the plate and the magnet and fixing the magnet to the plate. The plate includes: a plate body in which the adhesive member is arranged; a protrusion unit extended from an inner circumferential surface of the plate body toward a shaft direction; a rotation unit arranged to be rotatable to the protrusion unit; and a protrusion arranged in the rotation unit. The protrusion is arranged inside the hole by rotation of the rotation unit. To this end, the sensing magnet assembly of the motor uses coupling of the hole formed in the magnet and the protrusion of the plate so as to prevent separation of the magnet.

Description

SENSING STATOR AND MOTOR HAVING THE SAME

Embodiments relate to a sensing magnet assembly and a motor comprising the same.

A motor is a device that obtains rotational force by converting electrical energy into mechanical energy, and is widely used in vehicles, household appliances, and industrial equipment.

The motor may include a housing, a shaft, a stator disposed inside the housing, a rotor installed on an outer circumferential surface of the shaft, and the like. Here, the stator of the motor induces electrical interaction with the rotor to induce rotation of the rotor. And, as the rotor rotates, the shaft also rotates.

The sensing magnet assembly disposed in the motor is installed to rotate in conjunction with the rotor to induce the magnetic element to detect the position of the rotor through the magnetic field of the magnet included in the sensing magnet assembly.

This sensing magnet assembly includes a plate in the form of a disc and a magnet that couples to the plate. Typically, the sensing magnet assembly is implemented in the form of a magnet coupled to the top of the plate.

For example, the magnet is attached to the plate via an adhesive disposed between the plate and the magnet.

However, when the magnet is attached, there is a problem in that the magnet is attached to a predetermined position because there is no structure for holding the magnet.

In addition, when the center of gravity of the plate and the magnet is distorted, a problem arises in that vibration and noise are increased by the magnet disposed eccentrically with respect to the plate.

In addition, the eccentrically arranged magnets may be separated from the plate by rotation.

Furthermore, when the motor is used in an electronic power steering system (EPS), the above-described problem may cause a fatal problem for safe driving of the vehicle.

The embodiment provides a motor that prevents the magnet from being detached by using a protrusion coupled to the magnet.

The problem to be solved by the present invention is not limited to the above-mentioned problem and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

The object according to the embodiment, the plate; A magnet disposed on the plate and having a hole formed therein; And an adhesive member disposed between the plate and the magnet to fix the magnet to the plate, wherein the plate includes a plate body on which the adhesive member is disposed, a protrusion extending in an axial direction from an inner circumferential surface of the plate body, And a rotating part disposed to be rotatable and a protrusion disposed on the rotating part, the rotation of the rotating part being accomplished by a sensing magnet assembly in which the protrusion is disposed.

The magnet may include a ring-shaped magnet body and a coupling portion protruding inward from an inner circumferential surface of the magnet body, and the hole may be formed in the coupling portion.

In addition, a lower surface of the coupling part contacts the seating surface of the protrusion, and a sum of a height up to the seating surface and the thickness of the coupling part based on the upper surface of the plate body may be equal to the thickness of the magnet body.

The rotating part may be formed in a plate shape extending upward from the protrusion, and as the rotating part is bent, the protrusion of the rotating part may be disposed in the hole.

The plate may further include a groove formed in the rotational portion in the width direction, and the bending of the rotational portion may be guided by the groove.

On the other hand, the protrusion may be formed in a hemispherical shape.

The protrusion may include a through hole formed at a center thereof, and the plate may further include a sleeve protruding in the axial direction from the protrusion, and the sleeve may extend the through hole.

The object according to the embodiment, the housing; A stator disposed within the housing; A rotor disposed in the stator; A shaft engaged with the rotor; A sensing magnet assembly disposed above the rotor and a sensor unit disposed above the sensing magnet assembly, wherein the sensing magnet assembly includes a plate, a magnet disposed on the plate, and a hole formed therebetween, and between the plate and the magnet. An adhesive member disposed to fix the magnet to the plate, wherein the plate includes a plate body on which the adhesive member is disposed, a protrusion extending in an axial direction from an inner circumferential surface of the plate body, and a rotatably disposed on the protrusion. And a projection disposed on the eastern portion and the pivoting portion, and is achieved by a motor in which the projection is disposed inside the hole by the rotation of the pivoting portion.

The sensing magnet assembly of the motor according to the embodiment may prevent the magnet from being separated by using a combination of the protrusion of the plate and the hole formed in the magnet.

The sensing magnet assembly of the motor according to the embodiment may be bent by the rotating part of the plate to couple the projection formed in the rotating part to the hole formed in the magnet, it is possible to fix the magnet to the plate. That is, the combination of the hole and the protrusion may prevent the magnet from being eccentrically disposed with respect to the plate, and at the same time, fix the magnet to the plate. As such, the coupling can minimize vibration and noise of the motor.

1 is a view showing a motor according to an embodiment,
2 is a perspective view illustrating a sensing magnet assembly according to an embodiment;
3 is an exploded perspective view illustrating a sensing magnet assembly according to an embodiment;
4 is a plan view illustrating a sensing magnet assembly according to an embodiment;
5 is a cross-sectional view illustrating a line AA of FIG. 4,
6 is a perspective view illustrating a plate of a sensing magnet assembly according to an embodiment;
7 is a view illustrating a process of assembling the plate and the magnet of the sensing magnet assembly according to the embodiment.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers, such as second and first, 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. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

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.

In the description of the embodiments, when one component is described as being formed on the "on or under" of the other component, the upper (up) or lower (down) (on or under) includes both the two components are in direct contact with each other (directly) or one or more other components are formed indirectly formed between the two (component). In addition, when expressed as 'on' or 'under' it may include the meaning of the downward direction as well as the upward direction based on one component.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" 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.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

1 is a view showing a motor according to an embodiment. In FIG. 1, the y direction means the axial direction, and the x direction means the radial direction. And the axial direction and the radial direction are perpendicular to each other.

Referring to FIG. 1, the motor 1 according to the embodiment includes a housing 100 having an opening formed at one side thereof, a cover 200 disposed at an upper portion of the housing 100, and a stator disposed inside the housing 100. 300, a rotor 400 disposed inside the stator 300, a shaft 500 rotating together with the rotor 400, a bus bar 600 disposed above the stator 300, a rotor 400, and It may include a sensor unit 700 for detecting the rotation of the shaft 500 and the sensing magnet assembly 800 according to the embodiment. Here, the inner side means a direction disposed toward the center C with respect to the radial direction, and the outer side means a direction opposite to the inner side.

Such a motor 1 may be a motor used for EPS. EPS (Electronic Power Steering System) assists the steering force by the driving force of the motor, to ensure the stability of the turning and provides a fast recovery force to enable the driver to drive safely.

The housing 100 and the cover 200 may form an outer shape of the motor 1. In addition, the accommodation space may be formed by the combination of the housing 100 and the cover 200. Accordingly, in the accommodation space, as shown in Figure 1, the stator 300, the rotor 400, the shaft 500, the bus bar 600, the sensor unit 700 and the sensing magnet assembly 800, etc. This can be arranged. At this time, the shaft 500 is rotatably disposed in the accommodation space. Thus, the motor 1 may further include a bearing 10 disposed on the upper and lower portions of the shaft 500, respectively.

The housing 100 may be formed in a cylindrical shape. In this case, the shape or material of the housing 100 may be variously modified. For example, the housing 100 may be formed of a metal material that can withstand high temperatures well.

The cover 200 may be disposed on an opening surface of the housing 100, that is, an upper portion of the housing 100 to cover the opening of the housing 100.

The stator 300 may be accommodated in the housing 100. In addition, the stator 300 causes electrical interaction with the rotor 400. In this case, the stator 300 may be disposed outside the rotor 400 based on the radial direction.

Referring to FIG. 1, the stator 300 may include a stator core 310, an insulator 320 disposed on the stator core 310, and a coil 330 wound around the insulator 320.

The stator core 310 may be an integral core or a core in which a plurality of split cores are combined. For example, the stator core 310 may be implemented in a shape in which a plurality of plates in the form of a circular thin steel sheet are stacked or may be implemented in a single cylindrical shape.

The insulator 320 may be disposed on the stator core 310 to insulate the stator core 310 from the coil 330. Here, the insulator 320 may be formed of a resin material.

The coil 330 may be wound around the insulator 320. The coil 330 may form a rotating magnetic field by supplying power.

Here, the end of the coil 330 wound on the insulator 320 may be disposed to be exposed to the upper side. In addition, an end of the coil 330 may be coupled to the bus bar 600.

The rotor 400 may be disposed inside the stator 300, and the shaft 500 may be coupled to a central portion thereof. Here, the rotor 400 may be rotatably disposed on the stator 300.

The rotor 400 may include a rotor core and a magnet. The rotor core may be implemented in a stacked shape of a plurality of plates in the form of a circular thin steel sheet, or may be implemented in a single cylinder. A hole in which the shaft 500 is coupled may be formed at the center of the rotor core. The outer circumferential surface of the rotor core may be a projection for guiding the magnet. The magnet may be attached to the outer circumferential surface of the rotor core. The plurality of magnets may be disposed along the circumference of the rotor core at regular intervals. In addition, the rotor 400 may be of a type in which the magnet is inserted into the pocket of the rotor core.

Therefore, the rotor 400 rotates due to the electrical interaction between the coil 330 and the magnet, and when the rotor 400 rotates, the shaft 500 rotates to generate a driving force.

On the other hand, the rotor 400 may further include a can member disposed to surround the magnet. The can member fixes the magnet so that it is not separated from the rotor core. In addition, the can member may prevent the magnet from being exposed to the outside.

The shaft 500 may be rotatably disposed in the housing 100 by the bearing 10.

The bus bar 600 may be disposed above the stator 300.

In addition, the bus bar 600 may be electrically connected to the coil 330 of the stator 300.

The bus bar 600 may include a bus bar body and a terminal disposed inside the bus bar body. Here, the bus bar body may be a mold formed through injection molding. One side of the terminal may be electrically connected to the coil 330.

The sensor unit 700 may detect the current position of the rotor 400 by sensing the magnetic force of the sensing magnet assembly 800 installed to be rotatable interlocked with the rotor 400, thereby detecting the rotation of the shaft 500.

The sensor unit 700 may be disposed above the sensing magnet assembly 800.

The sensor unit 700 may include a printed circuit board (PCB) and a sensor (not shown).

The sensor may be disposed on the printed circuit board. The sensor detects the magnetic force of the magnet disposed in the sensing magnet assembly 800. In this case, the sensor may be provided as a Hall IC. In addition, the sensor may generate a sensing signal by detecting a change in the N pole and the S pole of the magnet disposed in the sensing magnet assembly 800.

2 is a perspective view illustrating a sensing magnet assembly according to an embodiment, FIG. 3 is an exploded perspective view illustrating a sensing magnet assembly according to an embodiment, FIG. 4 is a plan view illustrating a sensing magnet assembly according to an embodiment, and FIG. 5 is a view. 4 is a cross-sectional view showing a line AA, Figure 6 is a perspective view showing a plate of the sensing magnet assembly according to the embodiment.

2 to 6, the sensing magnet assembly 800 according to the embodiment may include a magnet 810, an adhesive member 820, and a plate 830. In this case, the protrusion 834 formed in the plate 830 may be disposed in the hole 813 formed in the magnet 810. Here, the plate 830 may be called a sensing plate.

The combination of the hole 813 of the magnet 810 and the protrusion 834 of the plate 830 may prevent separation of the magnet 810 together with the adhesive member 820.

The magnet 810 may be disposed above the plate 830. The magnet 810 may be fixed to the upper portion of the plate 830 by the adhesive member 820.

The magnet 810 rotates as the plate 830 rotates in association with the shaft 500. In this case, the magnet 810 may be disposed to be spaced apart from the sensor of the sensor unit 700. Accordingly, the sensor detects a change in magnetic flux of the magnet 810 and calculates a rotation angle of the rotor 400.

The magnet 810 may include a ring-shaped magnet body 811 and a coupling part 812 protruding inward from the inner circumferential surface 811c of the magnet body 811. Here, the coupling portion 812 may be formed with a hole 813 penetrating in the axial direction.

The magnet body 811 may be formed in a ring shape. The magnet body 811 may include a main magnet 811a disposed at the center and a sub magnet 811b disposed at the edge.

The main magnet 811a may be formed in a ring shape. In this case, the main magnet 811a may be provided as a plurality of divided magnets. When the main magnet 811a is formed of a split magnet, the number of divided magnets (poles) is the same as the number of magnets (poles) disposed in the rotor 400 to be configured to detect rotation of the rotor. Can be.

The sub magnets 811b are disposed outside the main magnets 811a and may include a larger number (number of poles) than the main magnets 811a. Thereby, one pole (divided magnet) of the main magnet 811a is further subdivided and disassembled. Therefore, the sub magnet 811b makes it possible to more accurately measure the detection of the amount of rotation of the rotor 400.

Meanwhile, ferrite rubber may be used as the main magnet 811a and the sub magnet 811b.

The coupling part 812 may be formed to protrude inward from the inner circumferential surface 811c of the magnet body 811. Coupling portion 812 may be provided in a plate shape, it may be formed in a planar semi-circular or fan shape.

The hole 813 may be formed in the coupling part 812. Here, the hole 813 may be formed to penetrate the coupling portion 812 in the axial direction. The embodiment has an example in which the hole 813 is formed in the coupling part 812, but is not necessarily limited thereto. For example, a groove may be formed in the coupling portion 812 instead of the hole 813.

As illustrated in FIGS. 2 and 3, the holes 813 may be spaced apart from the inner circumferential surface 811c of the magnet body 811 at predetermined intervals.

The adhesive member 820 fixes the magnet 810 to the plate 830.

As shown in FIG. 3, the adhesive member 820 may be formed in a ring shape.

The adhesive member 820 is disposed between the magnet 810 and the plate 830. In this case, an adhesive such as a double-sided tape or a bond may be used as the adhesive member 820. One surface of the adhesive member 820 may be adhered or applied to the upper surface 831a of the plate 830.

Plate 830 may be coupled to shaft 500. Accordingly, the plate 830 may rotate in conjunction with the rotation of the shaft 500.

3 and 4, the plate 830 protrudes in the plate body 831, the plate body 831 in the axial direction, and a protrusion 832 and a protrusion 832 having a through hole 832a formed in the center thereof. It may include a rotating part 833 and the protrusion 834 disposed on the rotating part 833.

Therefore, the protrusion 834 may be disposed inside the hole 813 by the rotation of the pivoting part 833. Accordingly, the combination of the hole 813 of the magnet 810 and the protrusion 834 of the plate 830 prevents the magnet 810 from being eccentrically disposed with respect to the plate 830 and at the same time. The magnet 810 may be fixed to the plate 830 to prevent separation of the magnet 810.

On the other hand, the plate 830 may further include a groove 835 formed in the width direction in the rotating portion 833. In addition, the plate 830 may further include a sleeve 836 extending the through hole 832a.

The plate body 831, the protrusion 832, the pivot 833, the protrusion 834, and the sleeve 836 may be integrally formed. At this time, the plate 830 may be formed of an electroplated steel sheet.

The plate body 831 may be formed of a ring-shaped plate. In this case, the adhesive member 820 may be disposed on the upper surface 831a of the plate body 831.

The protrusion 832 may protrude in the axial direction from the inner circumferential surface of the plate body 831. In this case, the upper surface of the protrusion 833 may be disposed higher than the upper surface 831a of the plate body 831.

3 and 4, the planar protrusion 833 may be formed in a triangular pillar shape having three sides and corners. In this case, the corners disposed between the sides may be formed in a round shape having a predetermined curvature for ease of processing and prevention of damage due to impact. Here, the protrusion 833 is a triangular pillar shape as an example, but is not necessarily limited thereto, and may be formed in a shape having a plurality of sides and a plurality of corners, such as a square, a pentagon, a hexagon, and an octagonal column.

A through hole 832a may be formed in the center of the protrusion 832. In addition, the shaft 500 may be disposed in the through hole 832a of the protrusion 832. At this time, since the shaft 500 is fitted into the through hole 832a by a press-fit method, the shaft 500 and the plate 830 may be integrally rotated.

The rotating part 833 may be rotatably disposed on the upper surface of the protrusion 832. Here, the upper surface of the protrusion 832 may include a first surface disposed inside and a second surface disposed outside with respect to the pivoting part 833. In addition, a bottom surface of the coupling part 812 is disposed to contact the second surface, and the second surface may be referred to as a seating surface 833b.

As shown in FIG. 5, the lower surface of the coupling part 812 may contact the seating surface 832b of the protrusion 832. At this time, the sum of the height H up to the seating surface 832b and the thickness T1 of the coupling part 812 based on the upper surface 831a of the plate body 831 is the thickness of the magnet body 811. It may be the same as (T2).

Referring to FIG. 6, the rotation part 833 may be formed in a plate shape extending upward from an upper surface of the protrusion 832. In addition, the rotation part 833 may be rotated by bending one region to the outside by bending. Accordingly, the rotation part 833 may cover the coupling part 812 seated on the seating surface 833b. Here, the rotating unit 833 is rotated by bending as an example, but is not necessarily limited thereto. For example, the pivot 833 may be disposed in the protrusion 832 in a hinge type.

As shown in FIG. 3, the shape of the rotation part 833 may be formed in a shape corresponding to the shape of the coupling part 812. Accordingly, a portion of the rotating part 833 may be bent to cover the upper portion of the coupling part 812.

The protrusion 834 may be disposed at the pivoting part 833.

As shown in FIG. 6, the protrusion 834 may be disposed on the outer surface 833a of the pivot 833. Accordingly, the protrusion 834 may be coupled to the inside of the hole 813 formed in the coupling part 812 by the rotation of the rotation part 833. Therefore, the combination of the hole 813 and the protrusion 834 may prevent the magnet 810 from being separated from the plate 830. In addition, since the magnet 810 is disposed at a predetermined position of the plate 830 by the coupling of the protrusion 834 of the plate 830 and the hole 813 of the magnet 810, the coupling is performed by the magnet 810. This plate 830 is prevented from being disposed eccentrically.

The protrusion 834 may be formed in a hemispherical shape. The hemispherical shape facilitates coupling of the hole 813 and the protrusion 834. Here, the protrusion 834 may be formed to protrude from the outer surface 833a of the pivot 833 by pressing a region of the inner surface 833b of the pivot 833.

A plurality of protrusions 834 may be disposed at predetermined intervals along the circumferential direction based on the center C of the plate 830. At this time, the projections 834, but the three are spaced apart at intervals of 120 degrees relative to the center (C) as an example, but is not necessarily limited thereto.

The groove 835 may be concave in the pivot 833. In addition, the groove 835 may guide the bending of the pivot 833.

As shown in FIG. 6, the groove 835 may be formed in the width direction on the inner side surface 833b of the rotation part 833. Since the thickness of the pivot 833 in the region where the groove 835 is formed is smaller than the thickness in other regions, the pivot 833 can be easily bent in the region where the groove 835 is formed.

Accordingly, the groove 835 may present a bending direction of the pivot 833. For example, the groove 835 may be formed in a direction perpendicular to a radial direction on a plane when the rotation part 833 is bent outwardly. At this time, the groove 835 may be formed long from one side to the other side of the rotating part 833.

The sleeve 836 may protrude to extend in the axial direction at the center of the protrusion 832. Accordingly, the sleeve 836 may extend the through hole 832a to secure the coupling between the shaft 500 and the plate 830.

7 is a view illustrating a process of assembling the plate and the magnet of the sensing magnet assembly according to the embodiment. Here, Figure 7 (a) is a view showing an adhesive member disposed on the plate, Figure 7 (b) is a view showing a magnet disposed on the adhesive member, Figure 7 (c) is a circuit of the plate It is a figure which shows the magnet fixed by the rotation of the eastern part.

Referring to FIG. 7A, an adhesive member 820 may be disposed on the plate 830. In this case, the adhesive member 820 may be disposed on the upper surface 831a of the plate body 831.

Referring to FIG. 7B, a magnet 810 may be disposed on the adhesive member 820. Accordingly, the magnet 810 may be fixed to the plate 830. At this time, the rotating part 833 of the plate 830 may be disposed to protrude upward.

Referring to FIG. 7C, the rotation part 833 of the plate 830 may be bent outwardly by bending. Accordingly, the protrusion 834 of the plate 830 may be coupled to the hole 813 of the magnet 810.

Therefore, when the sensing magnet assembly 800 rotates, the coupling of the hole 813 and the protrusion 834 may improve the balance and reliability of the sensing magnet assembly 800 with respect to the rotation.

Although described above with reference to embodiments of the present invention, those of ordinary skill in the art have various modifications and changes of the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated that it can be changed. And differences relating to such modifications and variations should be construed as being included in the scope of the invention defined in the appended claims.

1: motor
10: bearing
100: housing
200: cover
300: stator
400: rotor
500: shaft
600: busbar
700: sensor
800, 800a: sensing magnet assembly
810: magnet 813: hole
820: adhesive member
830: plate
831: plate body 832: protrusion
833: rotating part
834: turning
835: home
836: sleeve

Claims (8)

plate;
A magnet disposed on the plate and having a hole formed therein; And
An adhesive member disposed between the plate and the magnet to fix the magnet to the plate,
The plate is
A plate body in which the adhesive member is disposed;
A protrusion extending in an axial direction from an inner circumferential surface of the plate body,
A rotating part rotatably disposed in the protruding part;
It includes a protrusion disposed in the rotating part,
And a sensing magnet assembly in which the protrusion is disposed in the hole by the rotation of the pivoting part. The method of claim 1,
The magnet includes a ring-shaped magnet body and a coupling portion protruding inward from the inner circumferential surface of the magnet body,
The hole is a sensing magnet assembly formed in the coupling portion. The method of claim 2,
A lower surface of the coupling part is in contact with a seating surface of the protrusion,
The sum of the height to the seating surface and the thickness of the coupling portion relative to the upper surface of the plate body is equal to the thickness of the magnet body. The method of claim 3,
The rotating part is formed in a plate shape extending upward from the protrusion,
Sensing magnet assembly of the rotating part is disposed in the hole as the rotating part is bent. The method of claim 4, wherein
The plate further includes a groove formed in the width direction in the rotating part,
Sensing magnet assembly is guided by the groove bending of the rotating part. The method of claim 1,
The projection magnet assembly is formed in a hemispherical shape. The method of claim 1,
The protrusion includes a through hole formed in the center,
The plate further includes a sleeve protruding in the axial direction from the protrusion,
And said sleeve extends said through hole. housing;
A stator disposed within the housing;
A rotor disposed in the stator;
A shaft engaged with the rotor;
A sensing magnet assembly disposed above the rotor;
It includes a sensor unit disposed on the sensing magnet assembly,
The sensing magnet assembly is
A plate, a magnet disposed on the plate and having a hole formed therebetween, and an adhesive member disposed between the plate and the magnet to fix the magnet to the plate,
The plate is
A plate body in which the adhesive member is disposed;
A protrusion extending in an axial direction from an inner circumferential surface of the plate body,
A rotating part rotatably disposed in the protruding part;
It includes a protrusion disposed in the rotating part,
The motor is disposed in the hole by the rotation of the rotating unit.

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