KR20200089492A - Commutator assembly and motor having the same - Google Patents

Abstract

According to an embodiment of the present invention, provided is a motor which comprises: a housing; a first cover disposed in an opening of the housing; a brush disposed on a lower portion of the first cover; a stator disposed in the housing; a rotor disposed on the inside of the stator; a shaft coupled to the rotor; a commutator assembly disposed on the shaft; and a sensor unit disposed to face a sensing magnet unit of the commutator assembly. The commutator assembly includes: a commutator body; a plurality of commutator bars disposed along a circumferential direction of the commutator body; and a sensing magnet unit coupled on an upper portion of the commutator body. Accordingly, the motor can secure sensing accuracy of the motor by using the commutator assembly coupling a sensing magnet to a commutator.

Description

Commutator assembly and motor having the same [Commutator assembly and motor HAVING THE SAME}

Embodiments relate to a commutator assembly and a motor having the same.

A motor is a device that converts electrical energy into mechanical energy to obtain rotational force, and is widely used in vehicles, home electronics, and industrial equipment.

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

And, the motor may include a commutator and a brush to supply current to the coil of the rotor.

In addition, the motor may include a sensing magnet and a sensor sensing the sensing magnet to sense the position of the rotor. Here, the sensing magnet may be coupled to the shaft using a sensing plate.

However, when the sensing plate is pressed and coupled to the shaft, the sensing plate may be distorted or warped. Accordingly, there is a problem in that the sensing accuracy of the motor is deteriorated.

In addition, in the motor, there is a problem that corrosion occurs because the sensor and the circuit board on which the sensor is installed are exposed to the outside.

In order to secure the sensing accuracy of the motor, there is provided a commutator assembly in which a sensing magnet is coupled to a commutator and a motor including the commutator assembly.

In addition, by providing a commutator assembly coupled with a sensing magnet, a motor with improved productivity by simplifying the assembly process is provided.

In addition, a motor capable of preventing damage due to external factors is provided by placing the sensor inside the motor.

The problems to be solved by the embodiments are not limited to the problems mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

The subject, according to the embodiment, the housing; A first cover disposed in the opening of the housing; A brush disposed under the first cover; A stator disposed in the housing; A rotor disposed inside the stator; A shaft coupled with the rotor; A commutator assembly disposed on the shaft; And a sensor part disposed to face the sensing magnet part of the commutator assembly, wherein the commutator assembly includes a commutator body, a plurality of commutator pieces arranged along the circumferential direction of the commutator body, and the sensing coupled to an upper part of the commutator body. It is achieved by a motor comprising a magnet portion.

Here, the radius R1 of the sensing magnet part based on the shaft C of the shaft may be larger than the radius R2 of the commutator piece.

In addition, an end of the brush may be disposed to be overlapped with respect to the axial direction under the sensing magnet portion.

Further, the commutator body may be disposed under the sensing magnet by injection molding.

In addition, the sensing magnet part may be provided as a plastic magnet.

In addition, the sensing magnet portion includes a sensing plate disposed on the upper portion of the commutator body and a sensing magnet disposed on the upper portion of the sensing plate, the sensing plate is formed of a metal material, and the commutator body is a lower portion of the sensing plate It can be arranged by injection molding method. Here, the lower surface of the sensing plate may be arranged to form a predetermined gap (G) with the upper end of the commutator piece.

In addition, the sensing magnet portion includes a sensing plate coupled to a groove formed on the top of the commutator body and a sensing magnet disposed on the upper side of the sensing plate, wherein the sensing plate is formed of a metal material, and the lower surface of the sensing plate is An upper end of the commutator piece and a predetermined gap G may be disposed.

Meanwhile, the sensor unit may include a circuit board disposed under the first cover and a sensor disposed on the circuit board, and the sensor may be disposed to face the sensing magnet unit.

In addition, the shaft is formed of a metal material, and the inner circumferential surface of the sensing magnet part may be spaced apart from the outer circumferential surface of the shaft.

The subject is, according to the embodiment, a commutator body formed of a synthetic resin material; A plurality of commutator pieces disposed along the circumferential direction of the commutator body; And a sensing magnet part coupled to the top of the commutator body.

Here, the commutator element includes a commutator element body and a hook portion disposed under the commutator element body, and the radius R1 of the sensing magnet portion based on the axis C is greater than the radius R2 of the commutator element body. It can be big.

Further, the commutator body may be disposed under the sensing magnet by injection molding.

In addition, the sensing magnet part may be provided as a plastic magnet.

In addition, the sensing magnet portion includes a sensing plate coupled to the upper portion of the commutator body and a sensing magnet disposed on the upper side of the sensing plate, the sensing plate is formed of a metal material, and the lower surface of the sensing plate is the commutator piece. The upper end and the predetermined gap G may be arranged to be formed.

On the other hand, the inner diameter (D1) of the commutator body may be smaller than the inner diameter (D2) of the sensing magnet portion.

The motor according to the embodiment having the above-described configuration can secure the sensing accuracy of the motor using a commutator assembly in which a sensing magnet is coupled to a commutator.

The commutator assembly including the sensing magnet is coupled to the shaft to exclude damage caused by the process of directly pressing and coupling the sensing magnet to the shaft. Accordingly, it is possible to secure the sensing accuracy of the motor by preventing distortion of the sensing magnet.

In addition, when assembling the motor, the assembly process of the motor can be simplified by providing a commutator assembly as one single component. Accordingly, the assembly time of the motor can be shortened to improve the productivity of the motor.

In addition, the motor can prevent damage due to external factors by placing the sensor inside.

Brush powder may be generated as the commutator rotates while the brush is in contact with the commutator. However, the brush powder may be prevented from moving toward the sensor side by the sensing magnet which is disposed to overlap the end of the brush in the axial direction. Accordingly, a drop in sensing accuracy of the sensor, which may be caused by the brush powder, can be prevented or minimized.

1 is a view showing a motor according to an embodiment,
2 is an enlarged view showing area A of FIG. 1,
3 is a view showing a brush and a sensor part disposed on a first cover of a motor according to an embodiment,
4 is a perspective view showing a commutator assembly according to a first embodiment disposed in a motor according to an embodiment,
5 is an exploded perspective view showing a commutator assembly according to a first embodiment disposed in a motor according to an embodiment,
6 is a plan view showing a commutator assembly according to a first embodiment disposed in a motor according to an embodiment,
7 is a side view showing a commutator assembly according to a first embodiment disposed in a motor according to an embodiment,
8 is an exploded perspective view showing a commutator assembly according to a second embodiment disposed on a motor according to an embodiment,
9 is a plan view showing a commutator assembly according to a second embodiment disposed in a motor according to an embodiment,
10 is a side view showing a commutator assembly according to a second embodiment disposed on a motor according to an embodiment.

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

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the technical spirit scope of the present invention, one or more of its components between embodiments may be selectively selected. It can be used by bonding and substitution.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless specifically defined and described, can be generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and commonly used terms, such as predefined terms, may interpret the meaning in consideration of the contextual meaning of the related technology.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, a singular form may also include a plural form unless specifically stated in the phrase, and is combined with A, B, and C when described as "at least one (or more than one) of A and B, C". It can contain one or more of all possible combinations.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only for distinguishing the component from other components, and the term is not limited to the nature, order, or order of the component.

And, when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also to the component It may also include the case of'connected','coupled' or'connected' by another component between the other components.

Further, when described as being formed or disposed in the "top (top) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other It also includes a case in which another component described above is formed or disposed between two components. In addition, when expressed as "up (up) or down (down)", it may include the meaning of the downward direction as well as the upward direction based on one component.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components are assigned the same reference numbers regardless of reference numerals, and redundant descriptions thereof will be omitted.

1 is a view showing a motor according to an embodiment, and FIG. 2 is an enlarged view showing area A of FIG. 1. In FIG. 1, the y-direction means an axial direction, and the x-direction may mean a radial direction. Here, the axial direction and the radial direction may be perpendicular to each other. In addition, the axial direction may be the longitudinal direction of the shaft 600.

1 and 2, the motor 1 according to the embodiment includes a housing 100 having an opening formed on one side, a first cover 200 disposed on an upper portion of the housing 100, and a first cover 200 The brush 300 disposed on the lower portion, the stator 400 disposed inside the housing 100, the rotor 500 disposed inside the stator 400, and the shaft 600 rotating together with the rotor 500 , It may include a commutator assembly 700 disposed on the shaft 600 and a sensor unit 800 for sensing the rotation of the sensing magnet unit 720 of the commutator assembly 700. Here, the inner side means a direction disposed toward the central axis C based on the radial direction, and the outer side means a direction opposite to the inner side.

In addition, the motor 1 may further include a second cover 900 disposed on the first cover 200.

The housing 100 and the second cover 900 may form the outer shape of the motor 1. Here, the housing 100 may be formed in a cylindrical shape with an opening on the top.

In addition, the first cover 200 and the second cover 900 may be disposed to cover the opened upper side opening of the housing 100. Here, the first cover 200 and the second cover 900 may implement a double cover structure, thereby improving the sealing ability inside the housing 100.

An accommodation space may be formed inside by combining the housing 100 and the first cover 200. In addition, as shown in FIG. 1, the stator 400, the rotor 500, the shaft 600, the commutator assembly 700, and the sensor unit 800 may be disposed in the accommodation space.

The housing 100 may be formed in a cylindrical shape. A pocket portion accommodating the bearing 10 supporting the lower portion of the shaft 600 may be provided at the lower portion of the housing 100. In addition, the bearing 10 may be disposed to support the upper portion of the shaft 600 also in the second cover 900 disposed on the upper portion of the housing 100. Here, the second cover 900 may be formed of a metal material.

The first cover 200 may be formed of a synthetic resin material such as a mold. Here, the first cover 200 may be formed in various shapes through an injection molding method.

Also, the first cover 200 may be disposed under the second cover 900. At this time, the outer surfaces of each of the first cover 200 and the second cover 900 may contact the inner circumferential surface of the housing 100. Accordingly, by the double cover structure implemented by the first cover 200 and the second cover 900 of the motor 1 disposed in the receiving space from a load applied from the outside or foreign matter flowing in from the outside, etc. Each component can be protected.

The brush 300 may be disposed under the first cover 200. In addition, the brush 300 may be formed in a rod shape having conductivity.

Brush 300 may be in close contact with commutator assembly 700. Accordingly, the brush 300 may electrically contact the commutator assembly 700 to provide a drive signal applied from the outside to the commutator assembly 700. Further, the external driving signal may be transmitted to the coil 520 of the rotor 500 that is electrically connected to the commutator assembly 700.

3 is a view showing a brush and a sensor unit disposed on a first cover of a motor according to an embodiment.

1 to 3, the first cover 200 may be formed to include a disk shape. In addition, the brush 300 may be disposed under the first cover 200. In addition, a choke coil 310 that is electrically connected to the brush 300 to shield electromagnetic waves and a terminal 320 that is electrically connected to the choke coil 310 are disposed under the first cover 200. Can be deployed.

Here, the terminal 320 may be disposed through the first cover 200 to be connected to an external power source. Accordingly, external power may be transmitted to the brush 300 through the terminal 320 and the choke coil 310.

The brush 300 may be disposed under the first cover 200 by a brush holder 330. At this time, the brush 300 may transmit power to the commutator assembly 700 by contacting one side of the commutator assembly 700 by an elastic member 340 providing an elastic force.

On the other hand, the end of the brush 300 is disposed overlapping with respect to the axial direction on the lower portion of the sensing magnet part 720 to prevent or minimize the drop in sensing accuracy caused by the brush powder generated when the motor 1 is driven. can do. Here, the brush powder may be generated when the commutator assembly 700 rotates while the brush 300 is in contact with the commutator assembly 700.

As shown in FIGS. 1 and 2, the contact area of one end of the brush 300 and the commutator assembly 700 with respect to the axial direction and the arrangement of the outer circumferential surface of the sensing magnet part 720 of the commutator assembly 700 When comparing the positions, the contact area is disposed inside the outer circumferential surface of the sensing magnet part 720. Accordingly, even if the brush powder is generated, movement of the brush powder to the sensor 820 side of the sensor unit 800 may be prevented or restricted by the sensing magnet unit 720. Here, the end of the brush 300 is disposed on the lower side of the sensing magnet portion 720.

The stator 400 induces electrical interaction with the rotor 500 to induce rotation of the rotor 500. The stator 400 is coupled to the inside of the housing 100.

In addition, the stator 400 may include a stator core (not shown) and a plurality of magnets (not shown) disposed on the stator core. The magnet forms a rotating magnetic field with the coil 520 wound around the rotor 500. The magnet may be arranged such that the N pole and the S pole alternately based on the circumferential direction of the shaft C of the shaft 600.

On the other hand, the stator core of the stator 400 may be manufactured by combining a plurality of divided cores or a single core composed of a single cylinder. In addition, the stator core may be formed by stacking a plurality of plates in the form of thin steel plates.

The rotor 500 is disposed outside the stator 400. At this time, the rotor 500 may be rotatably disposed inside the stator 400.

The rotor 500 may include a rotor core 510 and a coil 520.

The rotor core 510 may be formed by stacking a plurality of plates in the form of thin steel sheets, but is not limited thereto. For example, the rotor core 510 may be formed as a single unit.

The rotor core 510 may include a tooth protruding in a radial direction. Here, the tooth may be arranged to face the magnet. Then, the coil 520 is wound around the tooth. At this time, an insulator 530 may be disposed between the rotor core 510 and the coil 520. In addition, the insulator 530 insulates the rotor core 510 and the coil 520.

When a current is supplied to the coil 520, an electrical interaction with the magnet is caused, so that the rotor 500 can rotate. When the rotor 500 rotates, the shaft 600 also rotates.

The shaft 600 may be disposed at the center of the rotor 500. And, as the rotor 500 rotates, the shaft 600 may rotate together. At this time, the shaft 600 may be supported by the bearing 10.

Meanwhile, in order to supply current to the coil 520 wound on the rotor 500, the motor 1 may include a commutator assembly 700 electrically connected to the coil 520.

The commutator assembly 700 may be disposed on the outer circumferential surface of the shaft 600. At this time, the commutator assembly 700 may be disposed to be spaced apart from the upper rotor core 510 of the rotor 500.

4 is a perspective view showing a commutator assembly according to a first embodiment disposed on a motor according to an embodiment, and FIG. 5 is an exploded perspective view showing a commutator assembly according to a first embodiment disposed on a motor according to an embodiment, and FIG. 6 is a plan view showing a commutator assembly according to a first embodiment disposed in a motor according to an embodiment, and FIG. 7 is a side view showing a commutator assembly according to a first embodiment disposed in a motor according to an embodiment.

4 to 7, the commutator assembly 700 according to the first embodiment includes a commutator body 710, a sensing magnet unit 720 coupled to an upper portion of the commutator body 710, and the commutator body 710. ) May include a plurality of commutator pieces 730 disposed along the circumferential direction.

The commutator body 710 may be formed in a cylindrical shape in which a hole 711 is formed to have a predetermined inner diameter D1 in the center. Further, a shaft 600 may be disposed in the hole 711. Here, the hole 711 may be referred to as a first hole.

The commutator body 710 may be formed of an insulating material. For example, the commutator body 710 may be formed of a synthetic resin material such as a mold. Accordingly, the commutator body 710 may be formed on the lower portion of the sensing magnet part 720 by injection molding.

In the related art, since the sensing magnet is press-fitted into the shaft, the sensing magnet may be distorted and the sensing accuracy may be reduced. On the contrary, the motor 1 forms a commutator body 710 under the sensing magnet part 720 through an injection molding method, and the commutator body 710 is coupled to the shaft 600, so that the sensing magnet part The damage, distortion, and the like of 720 can be prevented.

Alternatively, as illustrated in FIG. 5, the commutator body 710 may include a groove 712 formed thereon to be coupled to the sensing magnet unit 720. In addition, a region of the sensing magnet unit 720 may be coupled to the groove 712.

Even when the sensing magnet part 720 is coupled to the upper part of the commutator body 710, since the commutator body 710 can be formed by an injection molding method, the flatness of the upper surface of the commutator body 710 is secured. can do. Accordingly, even if the bottom surface of the sensing magnet unit 720 is disposed in contact with the top surface of the commutator body 710, the sensing accuracy of the motor 1 may be secured by the flatness.

Accordingly, the sensing magnet part 720 may be disposed on the commutator body 710 in an injection molding method or in a manner that is coupled to a groove 712 formed in the commutator body 710.

The sensing magnet unit 720 may be provided as a magnetic plastic magnet. Accordingly, the sensing magnet unit 720 may be formed in various shapes.

Referring to FIG. 5, the sensing magnet part 720 may include a plate part 721, a protrusion part 722 formed to protrude in the axial direction below the plate part 721, and a hole 723 formed in the center. . Here, the plate portion 721 and the protrusion 722 may be integrally formed. Further, the hole 723 may be referred to as a second hole.

The plate portion 721 may be formed in a disc shape. Then, the hole 723 may be disposed in the center.

The protrusion 722 may be disposed inside the commutator body 710 by an injection molding method or may be disposed in the commutator body 710 in a manner that is coupled to the groove 712.

The hole 723 may be formed to have a predetermined inner diameter D2. Here, the inner diameter D2 of the hole 723 of the sensing magnet unit 720 may be larger than the inner diameter D1 of the hole 711 of the commutator body 710. That is, the inner diameter D1 of the commutator body 710 may be formed smaller than the inner diameter D2 of the sensing magnet unit 720.

Therefore, when the commutator assembly 700 and the shaft 600 are coupled, the inner circumferential surface 724 of the sensing magnet unit 720 is disposed to be spaced apart from the outer circumferential surface of the shaft 600. Accordingly, since only the commutator body 710 is coupled to the shaft 600 and the sensing magnet part 720 is not coupled to the shaft 600, damage to the sensing magnet part 720 due to the coupling can be prevented. .

The commutator piece 730 may be disposed on the outer circumferential surface of the commutator body 710. Here, the commutator piece 730 may be disposed on the commutator body 710 through an injection molding method, but is not limited thereto.

The commutator piece 730 may contact one side of the brush 300. Here, the commutator piece 730 may be formed of a metal material.

The commutator piece 730 may include a commutator piece body 731 contacting the brush 300 and a hook portion 732 disposed under the commutator piece body 731. Here, the commutator piece body 731 and the hook portion 732 may be integrally formed. In addition, the coil 520 may be electrically connected to the hook portion 732 formed in a hook shape. Accordingly, the current transmitted to the commutator piece 730 through the brush 300 may flow to the coil 520.

Meanwhile, referring to FIG. 2, the radius R1 of the sensing magnet part 720 based on the axis C of the shaft 600 may be greater than the radius R2 of the commutator piece 730. Here, the radius R1 of the sensing magnet portion 720 may represent a distance from the axis C to the outer circumferential surface of the plate portion 721, and the radius R2 of the commutator piece 730 is the axis C It may be a distance from the commutator side body 731 to the outer surface.

Accordingly, since the end of the brush 300 in contact with the outer surface of the commutator body 731 is disposed to overlap with respect to the axial direction under the sensing magnet part 720, the sensing accuracy by the brush powder Can be prevented or minimized.

Therefore, in the arrangement relationship between the sensing magnet part 720 and the commutator piece 730, the commutator assembly 700 forms an overlapping section R1-R2 based on the axial direction, so that the sensor part is formed by the brush powder. The influence of the sensor 820 of (800) can be minimized.

8 is an exploded perspective view showing a commutator assembly according to a second embodiment disposed on a motor according to an embodiment, and FIG. 9 is a plan view showing a commutator assembly according to a second embodiment disposed on a motor according to an embodiment, and FIG. 10 is a side view showing a commutator assembly according to a second embodiment disposed on a motor according to the embodiment.

The commutator assembly 700a according to the second embodiment may be disposed on the motor 1 in place of the commutator assembly 700 according to the first embodiment. In describing the commutator assembly 700a according to the second embodiment, the same components as the commutator assembly 700 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

8 to 10, the commutator assembly 700a includes a commutator body 710, a sensing magnet portion 720a coupled to an upper portion of the commutator body 710, and a circumferential direction of the commutator body 710. It may include a plurality of commutator pieces 730 disposed along.

The sensing magnet unit 720a includes a hole 723 formed in the center, a sensing plate 725 disposed on the commutator body 710, and a sensing magnet 726 disposed on the sensing plate 725. can do. Here, the sensing plate 725 may be formed of a metal material. In addition, the commutator body 710 may be disposed under the sensing plate 725 by an injection molding method.

The inner diameter D2 of the hole 723 of the sensing magnet portion 720a may be larger than the inner diameter D1 of the hole 711 of the commutator body 710.

The sensing plate 725 may be formed of a metal material in consideration of rigidity.

The sensing plate 725 may include a disk-shaped plate portion 725a and a protrusion 725b. At this time, the protrusion 725b of the sensing plate 725 may be disposed inside the commutator body 710 by an injection molding method. Alternatively, the protrusion 725b of the sensing plate 725 may be disposed on the commutator body 710 in a manner that is coupled to the groove 712 of the commutator body 710.

Since the sensing plate 725 is formed of a metal material, it can be arranged to be spaced apart from the commutator piece 730 in the axial direction.

As shown in FIG. 10, the lower surface 725c of the sensing plate 725 may be arranged to form a predetermined gap G with an upper end of the commutator piece 730. Here, the lower surface 725c of the sensing plate 725 may be the lower surface of the plate portion 725a.

The sensing magnet 726 may be formed in a disc shape.

8 and 9, the sensing magnet 726 may include a main magnet 726a disposed at the center and a sub-magnet 726b disposed at the edge.

The main magnet 726a may be formed of a plurality of split magnets formed in a split ring shape.

The sub magnet 726b is disposed outside the main magnet 726a and may be formed of a larger number of magnets (number of poles) than the main magnet 726a. Accordingly, one pole (split magnet) of the main magnet 726a is further subdivided and decomposed. Therefore, it is possible to measure the detection of the amount of rotation more precisely. Here, the sub-magnet 726b may be alternately arranged with a split magnet of the N pole and a split magnet of the S pole along the circumferential direction.

The sensor unit 800 may be disposed to be spaced apart from the top of the commutator assemblies 700 and 700a.

The sensor unit 800 detects the magnetic force of the sensing magnet portions 720 and 720a of the commutator assemblies 700 and 700a installed to be rotationally interlocked with the rotor 500, thereby determining the current position of the rotor 500 to determine the shaft ( 600) can be detected.

1 and 3, the sensor unit 800 may include a circuit board 810 disposed under the first cover 200 and a sensor 820 disposed on the circuit board 810. . Here, the sensor 820 may be disposed inside with respect to the radial direction based on the outer circumferential surfaces of the sensing magnet parts 720 and 720a. For example, based on the radial direction, the sensor 820 may be disposed closer to the shaft 600 than the outer circumferential surfaces of the sensing magnet parts 720 and 720a.

The sensor 820 may be disposed to face the sensing magnet units 720 and 720a. Then, the sensor 820 senses the magnetic force of the sensing magnet units 720 and 720a. Here, the sensor 820 may be provided as a Hall IC.

Although described above with reference to the embodiments of the present invention, those skilled in the art variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can change it. And, it should be interpreted that the differences related to the modifications and changes are included in the scope of the present invention defined in the appended claims.

1: motor
100: housing
200: first cover
300: brush
400: stator
500: rotor
600: shaft
700, 700a: commutator assembly
710: commutator body
720, 720a: Sensing magnet part
730: Commutator edition
800: sensor unit
900: second cover

Claims (11)

housing;
A first cover disposed in the opening of the housing;
A brush disposed under the first cover;
A stator disposed in the housing;
A rotor disposed inside the stator;
A shaft coupled with the rotor;
A commutator assembly disposed on the shaft; And
It includes a sensor portion facing the sensing magnet portion of the commutator assembly,
The commutator assembly is a motor including a commutator body, a plurality of commutator pieces disposed along a circumferential direction of the commutator body, and the sensing magnet part coupled to an upper portion of the commutator body. According to claim 1,
The radius R1 of the sensing magnet part based on the shaft C of the shaft is larger than the radius R2 of the commutator piece. According to claim 2,
The end of the brush is a motor that is disposed to overlap with respect to the axial direction in the lower portion of the sensing magnet. According to claim 3,
The commutator body is a motor that is disposed in the lower portion of the sensing magnet by an injection molding method. According to claim 4,
The sensing magnet unit includes a sensing plate disposed on the commutator body and a sensing magnet disposed on the sensing plate,
The commutator body is a motor that is disposed in the lower portion of the sensing plate by an injection molding method. The method of claim 5,
The sensing plate is formed of a metal material,
The lower surface of the sensing plate is a motor arranged to form a predetermined gap (G) with the upper end of the commutator piece. According to claim 3,
The sensing magnet portion includes a sensing plate coupled to a groove formed on the commutator body and a sensing magnet disposed on the sensing plate,
The sensing plate is formed of a metal material,
The lower surface of the sensing plate is a motor arranged to form a predetermined gap (G) with the upper end of the commutator piece. According to claim 1,
The sensor unit
It includes a circuit board disposed on the lower portion of the first cover and a sensor disposed on the circuit board,
The sensor is a motor disposed to face the sensing magnet. Commutator body formed of a synthetic resin material;
A plurality of commutator pieces disposed along the circumferential direction of the commutator body; And
A commutator assembly including a sensing magnet portion coupled to an upper portion of the commutator body. The method of claim 9,
The commutator piece includes a commutator piece body and a hook portion disposed under the commutator piece body,
A commutator assembly having a radius R1 of the sensing magnet portion based on an axis C is greater than a radius R2 of the commutator body. The method of claim 10,
The sensing magnet portion includes a sensing plate coupled to an upper portion of the commutator body and a sensing magnet disposed on the upper side of the sensing plate,
The sensing plate is formed of a metal material,
The lower surface of the sensing plate is a commutator assembly arranged to form a predetermined gap (G) with the upper end of the commutator piece.

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