KR20170126662A - Motor - Google Patents

Abstract

The present invention provides a motor. The motor includes a stator assembly; a rotor assembly disposed inside the stator assembly and including a rotor core, teeth protruding from the outer circumferential surface of the rotor core, and a coil wound around the teeth; a rotating shaft coupled to the rotor core; a commutator coupled to the rotating shaft and connected to the coil; and a brush including a contact surface facing the commutator. The contact surface of the brush includes a curved surface part contacting the commutator, and a cutting part formed on the curved surface part and not in contact with the commutator. It is possible to prevent the abrasion of the brush from being generated at a contact part between the brush and the commutator in the initial operation of the motor.

Description

Motor {Motor}

An embodiment relates to a motor.

The motor is provided with a shaft rotatably formed, a rotor coupled to the shaft, and a stator fixed to the inside of the housing. The stator is installed with a gap along the circumference of the rotor. The motor induces rotation of the rotor by electrical interaction. When the coil is wound on the rotor, a commutator and a brush are provided to supply current to the coil wound on the rotating rotor.

Typically, the commutator rotates in conjunction with the shaft in engagement with the shaft, and the brush is coupled to the housing and is disposed in contact with the commutator. At this time, the brush contacts the commutator and supplies electricity.

The contact surface of the brush can be formed into a curved surface corresponding to the curved surface of the commutator element. Generally, the radius of curvature of the contact surface of the initial brush may be greater than the radius of curvature of the commutator. This is to cause surface contact between the commutator and the brush contact surface in consideration of wear of the contact surface of the brush. However, foreign matter is generated due to abrasion of the brush in the initial driving state of the motor. The generated foreign matter is caught between the commutator and the brush to increase the contact resistance, thereby deteriorating the performance of the motor. In order to solve such a problem, the radius of curvature of the commutator and the contact surface of the brush can be the same, but the edges of both sides of the brush come into contact with the commutator before the contact surface of the brush touches the commutator due to the assembly tolerance. As a result, both edges of the brush are broken and foreign matter is generated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor capable of preventing abrasive foreign matter from being generated at a contact portion between a brush and a commutator when the motor is initially driven.

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

According to an aspect of the present invention, there is provided a stator assembly including a stator assembly, a rotor assembly disposed inside the stator assembly, the stator assembly including a rotor core, a rotor protruding from an outer circumferential surface of the rotor core, And a brush including a rotary shaft coupled to the core, a commutator coupled to the rotary shaft and connected to the coil, and a contact surface facing the commutator, wherein the contact surface of the brush includes a curved surface portion contacting the commutator, And a cutting portion formed to be bent and not in contact with the commutator.

Preferably, the curved surface portion is located at the center with respect to the width direction of the brush, and the cutting portion may be disposed on both sides of the curved surface portion with respect to the width direction of the brush.

Preferably, the cutting portion may be planar.

Preferably, the radius of curvature of the curved surface portion may be the same as the radius of curvature of the commutator.

Preferably, the cutting portion may be formed symmetrically with respect to a first reference line passing through the center of the commutator and the center of the curved portion.

Preferably, the cutting portion may be located on the opposite side of the commutator with reference to a reference circle formed along an outer circumferential surface of the commutator and a second reference line tangent to an intersection between the curved surface portion and the cutting edge.

Preferably, the cutting portion may be inclined with respect to a third reference line perpendicular to the first reference line and passing the intersection.

According to the embodiment, the radius of curvature of the curved surface portion in contact with the commutator is formed to be the same as the radius of curvature of the commutator, and a cutting portion that is not in contact with the commutator is formed on both sides of the curved surface portion. Thereby preventing the abrasive foreign matter of the brush from being generated in the portion.

1 shows a motor according to an embodiment,
FIG. 2 is a view showing a commutator and a brush of the motor shown in FIG. 1,
3 is a view showing a brush,
4 is a view showing a curved portion and a cutting portion of a contact surface,
5 is a view showing a brush of a motor according to another embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms and the inventor should properly define the concept of the term in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these 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 a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

FIG. 1 is a view showing a motor according to an embodiment, and FIG. 2 is a view showing a commutator and a brush of the motor shown in FIG.

1 and 2, a motor according to an embodiment may include a stator assembly 100, a rotor assembly 200, a rotary shaft 300, a commutator 400, and a brush 500 .

The stator assembly 100 induces electrical interaction with the rotor assembly 200 to induce rotation of the rotor assembly. The stator assembly 100 is coupled to the interior of the housing 1, and the stator assembly 100 can include a plurality of magnets 110. The magnet 110 forms a rotating magnetic field with the coil 230 wound around the rotor assembly 200. Six such magnets 110 may be provided and may be arranged so that the N pole and the S pole alternate with respect to the circumferential direction about the rotary shaft 300.

Meanwhile, the stator assembly 100 may be manufactured by combining a plurality of divided cores or may be fabricated into a single core. In an embodiment, the stator assembly 100 may be made up of three split cores, each including a magnet 110 of N and S poles.

The rotor assembly 200 is disposed inside the stator assembly 100. The rotor assembly 200 may include a rotor core 210 and a coil 230. The rotor core 210 may be formed by stacking a plurality of plates in the form of a thin steel plate. Or the rotor core 210 may be formed as a single unit. A plurality of teeth 220 may protrude from the outer circumferential surface of the rotor core 210. The teeth 220 may be arranged to protrude in the radial direction with respect to the center C of the rotor assembly 200 to face the magnet 110. The coil 230 is wound on each tooth 220. The insulator 2 is mounted on the teeth 220. The insulator (2) insulates the teeth (220) and the coil (230).

When an electric current is supplied to the coil 230, electrical interaction with the magnet 110 is induced and the rotor assembly 200 rotates. When the rotor assembly 200 rotates, the rotary shaft 300 also rotates. At this time, the rotary shaft 300 can be supported by the bearing 3.

Meanwhile, the commutator 400 and the brush 500 are required to supply current to the rotating rotor 200.

The commutator 400 is coupled to the rotating shaft 300. And the commutator 400 may be disposed above the rotor assembly 200. A commutator element (410) may be included around the commutator (400). The commutator segment 410 is electrically connected to the coil 230. Meanwhile, the brush 500 contacts the commutator element 410 and applies an external driving signal to the coil 230. 13 commutator pieces 410 may be disposed along the circumference of the commutator 400 corresponding to thirteen teeth 220 of the rotor assembly 200. [

The brush 500 is connected to an external power source to supply electricity to the commutator 400. The brush 500 is disposed in close contact with the commutator 400. The brush 500 may be installed on a cover member covering the housing 1. [ Two brushes 500 may be disposed, but the present invention is not limited thereto. The two brushes 500 may be arranged at intervals of 63 DEG to 66 DEG.

Fig. 3 is a view showing a brush, and Fig. 4 is a view showing a curved portion and a cutting portion of a contact surface.

Referring to FIGS. 3 and 4, the brush 500 includes a contact surface 510 that contacts the commutator 400. With the contact surface 510 in contact with the commutator 400, the brush 500 supplies current to the commutator 400.

The contact surface 510 may include a curved surface portion 511 and a cutting portion 512.

The curved surface portion 511 is a portion in contact with the commutator 500. In the curved surface portion 511, the commutator element 410 maintains the contact state while the commutator 500 rotating in conjunction with the rotation axis 300 rotates.

The curved surface portion 511 may be formed such that the radius of curvature thereof is equal to the radius of curvature of the commutator 500. [ The curved surface portion 511 may be formed at the center of the brush 500. The cutting portions 512 may be disposed on both sides of the curved surface portion 511, respectively.

The cutting portion 512 may be formed from the edge of the curved surface portion 511 to the edge of the contact surface 510. The cutting portion 512 may be formed in a plane, but the embodiment is not limited thereto and may be formed of a curved surface.

The cutting portion 512 is formed by being bent at the edge of the curved surface portion 511 with respect to the width direction of the brush 500 and is not in contact with the commutator 500. 4, the cutting portion 512 includes a second reference line L1 tangent to an edge P of the curved surface portion 511 on a reference circle O formed along an outer peripheral surface of the commutator 500, The commutator 500 may be disposed on the opposite side of the commutator 500.

The cutting portions 512 formed on both sides of the curved surface portion 511 may be symmetrical with respect to the first reference line CL passing the center of the commutator 500 and the center of the curved surface portion 511 .

Since the cutting portion 512 does not contact the commutator 500 in a state in which the curved surface portion 511 touches the commutator 500, the portion where the contact portion 510 and the commutator are in line contact is minimized. That is, even if the curved surface portion 511 is designed such that the radius of curvature thereof is the same as the radius of curvature of the commutator 500, the both side edges of the curved surface portion 511 can touch the commutator 500 first by the assembly tolerance. The motor according to the embodiment implements the cutting portion 512 that does not touch the commutator 500 at the both side edges of the curved surface portion 511 that can contact the commutator 500 to be broken or worn to produce foreign matter, The motor according to the embodiment can also improve the adhesion between the contact surface 510 and the commutator 500, thereby preventing the contact surface 510 from being damaged by abrasion. 510 and the commutator 500 to prevent the occurrence of a short circuit.

5 is a view showing a brush of a motor according to another embodiment.

5, the cutting portion 512 may be inclined with respect to a third reference line L2 passing through an edge P of the curved portion 511 perpendicular to the first reference line CL.

The cutting portion 512 may be formed by forming a curved portion 511 on the contact surface 510 and then cutting both sides of the contact surface 510. The shape of the cutting portion 512 is not limited to the shape of the cutting portion 512. The shape of the cutting portion 512 is not limited to the shape of the cutting portion 512, Various modifications can be made.

100: stator assembly
110: Magnet
200: rotor assembly
210: rotor core
220: Tees
230: Coil
300:
400: commutator
500: Brush
510: contact surface
511:
512:

Claims (7)

A stator assembly;
A rotor assembly disposed inside the stator assembly, the rotor assembly including a rotor core, a tooth protruding from an outer circumferential surface of the rotor core, and a coil wound around the tooth;
A rotating shaft coupled to the rotor core;
A commutator coupled to the rotating shaft and connected to the coil;
And a brush including a contact surface facing the commutator,
Wherein the contact surface of the brush includes a curved surface portion contacting the commutator and a cutting portion formed on the curved surface portion and not in contact with the commutator. The method according to claim 1,
Wherein the curved portion is centered with respect to a width direction of the brush, and the cutting portion is disposed on both sides of the curved portion with respect to a width direction of the brush. 3. The method of claim 2,
Wherein the cutting portion is flat. 3. The method of claim 2,
And a curvature radius of the curved surface portion is equal to a curvature radius of the commutator. The method of claim 4,
Wherein the cutting portion is symmetrical with respect to a first reference line passing through the center of the commutator and the center of the curved portion. 6. The method of claim 5,
Wherein the cutting portion is located on a side opposite to the commutator with reference to a reference circle formed along an outer circumferential surface of the commutator and a second reference line tangent to an intersection between the curved surface portion and the cutting edge. The method according to claim 6,
Wherein the cutting portion is inclined with respect to a third reference line perpendicular to the first reference line and passing the intersection.

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