Motor carbon brush and motor
By designing the internal cavity and through holes in the motor carbon brush, the accelerated cooling of air circulation is achieved, and the problem of excessive temperature caused by heat accumulation in existing motor carbon brushes is solved, which extends the service life of the motor.
Patent Information
- Application Number
- CN202421145729.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-23
AI Technical Summary
Existing motor carbon brushes generate a lot of heat when they come into contact with the brush, causing the motor temperature to be too high and shorten the service life.
A motor carbon brush is designed, with a cavity inside and communicated with the outside through a through hole, and the internal air circulation is used to accelerate the cooling.
It effectively reduces the temperature of the carbon brush, prevents high temperature from being transmitted to the motor, and extends the service life of the motor.
Smart Images
Figure CN222464307U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a motor, in particular to a motor carbon brush. Background Art
[0002] The function of the carbon brush on the motor is to conduct electricity through the rotating contact with the brush, and then transmit the current to the rotor coil, so that the motor generates rotational force and drives the equipment to work. Therefore, the carbon brush is a very important component of the motor and is the guarantee for the normal operation of the motor. However, due to the intense friction generated during the rotating contact between the existing carbon brushes and the brushes, a large amount of heat will be generated between the carbon brushes and the brushes, and the heat dissipation effect of the carbon brushes is very poor. This heat will continue to accumulate inside the motor, which can easily cause the temperature of the motor to be too high during operation, which may burn the motor and greatly shorten the service life of the motor. Utility Model Content
[0003] The utility model aims to provide a motor carbon brush which has good heat dissipation effect, effectively reduces the temperature of the motor when it is running, and prolongs the service life of the motor.
[0004] Another object of the utility model is to provide a motor with good heat dissipation effect and long service life.
[0005] In order to achieve the above-mentioned purpose, the motor carbon brush provided by the utility model includes a carbon brush body, the carbon brush body having a mounting end and a contact end, a cavity is opened inside the carbon brush body, the cavity extends toward the contact end and passes through the contact end, and a through hole is provided on the outer side of the carbon brush body near the mounting end, and the through hole is connected with the cavity, so that the cavity is connected with the outside of the carbon brush body.
[0006] Compared with the prior art, the utility model has a cavity formed inside the carbon brush body, and the cavity extends to the contact end that penetrates the carbon brush body, and a through hole is formed on the outer side of the carbon brush body near the mounting end, and the through hole is connected with the cavity, so that the cavity is connected with the outside of the carbon brush body, so that the heat generated by the friction between the carbon brush and the electric brush can flow out from the cavity and the through hole to the outside through the internal air, thereby allowing air to circulate inside and outside the carbon brush, thereby accelerating the cooling of the carbon brush, achieving good heat dissipation effect, effectively reducing the temperature of the carbon brush, and preventing high temperature from being transferred from the carbon brush to the rotor and the stator, thereby reducing the temperature of the motor during operation and effectively extending the service life of the motor.
[0007] Preferably, the cross section of the cavity is circular or square.
[0008] Preferably, the cross-sectional area of the cavity accounts for 16%-20% of the cross-sectional area of the carbon brush body. By setting such a ratio, it can be ensured that the carbon brush has sufficient strength to contact with the brush frictionally, and the cavity has sufficient space to dissipate heat, thereby achieving stable operation of the motor and improving the heat dissipation effect.
[0009] Preferably, a positioning portion is provided on the mounting end, and the positioning portion can be in positioning contact with the elastic element of the motor, thereby improving the convenience of carbon brush assembly.
[0010] Preferably, the carbon brush body is provided with a stopper protrudingly on the outer side near the mounting end. Since the carbon brush will be worn out by friction during use, its length will become shorter and shorter, so providing the stopper can prevent the carbon brush from being overused, thereby ensuring the motor.
[0011] Specifically, the limiting portions are symmetrically arranged on two opposite sides of the carbon brush body.
[0012] A motor comprises a housing, a motor bracket, a rotor, a stator, a rotating shaft, a brush and a motor carbon brush, wherein the motor bracket, the rotor and the stator are arranged in the housing, the stator is arranged on the motor bracket, and the rotor is rotatably arranged on the motor bracket; the rotating shaft is coaxially fixed with the rotor, the brush is arranged at one end of the rotating shaft, the motor carbon brush is symmetrically arranged on the motor bracket, and an elastic element is provided between the motor carbon brush and the motor bracket so that the two carbon brushes are electrically contacted with the brush respectively. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural diagram of the motor of the utility model.
[0014] Figure 2 It is a structural diagram of the carbon brush of the motor of the utility model.
[0015] Figure 3 It is a structural diagram of the carbon brush of the motor of the utility model in another direction.
[0016] Figure 4 It is an axial cross-sectional view of the motor of the present utility model.
[0017] Figure 5 It is a structural diagram of another embodiment of the motor of the present utility model. DETAILED DESCRIPTION
[0018] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.
[0019] like Figure 1As shown, the motor 100 of the utility model includes a housing (not shown in the figure), a motor bracket 1, a rotor 2, a stator 3, a rotating shaft 4, a brush 5 and a motor carbon brush 6, wherein the motor bracket 1, the rotor 2 and the stator 3 are arranged in the housing, the stator 3 is arranged on the motor bracket 1, and the rotor 2 is rotatably arranged on the motor bracket 1; the rotating shaft 4 is coaxially fixed with the rotor 2, the brush 5 is arranged at one end of the rotating shaft 4 and is electrically connected to the coil of the rotor 2, the motor carbon brush 6 is symmetrically arranged on the motor bracket 1, and an elastic element 7 is provided between the motor carbon brush 6 and the motor bracket 1 so that the two carbon brushes are electrically contacted with the brush 5 respectively.
[0020] See also Figures 2 to 4 The motor carbon brush 6 includes a carbon brush body 61, and the carbon brush body 61 has a mounting end 611 and a contact end 612. A cavity 613 is opened inside the carbon brush body 61, and the cavity 613 extends toward the contact end 612 and penetrates the contact end 612. A through hole 614 is provided on the outer side of the carbon brush body 61 near the mounting end 611, and the through hole 614 is connected with the cavity 613, so that the cavity 613 is connected with the outside of the carbon brush body 61.
[0021] Please see again Figures 2 to 4 , the cross section of the cavity 613 is circular. The cross-sectional area of the cavity 613 accounts for 16%-20% of the cross-sectional area of the carbon brush body 61. In this embodiment, the cross-sectional area of the cavity 613 accounts for 18.25% of the cross-sectional area of the carbon brush body 61. By setting such a ratio, it can be ensured that the carbon brush has sufficient strength to frictionally contact with the brush 5, and the cavity 613 can have sufficient space to dissipate heat, thereby achieving stable operation of the motor 100 and improving the heat dissipation effect.
[0022] Please see again Figures 2 to 4 , a positioning portion 615 is provided on the mounting end 611. The positioning portion 615 can be positioned and contacted with the elastic element 7 of the motor 100, thereby improving the convenience of carbon brush assembly. The elastic element 7 is a compression spring. A limiting portion 616 is protrudingly provided on the outer side of the carbon brush body 61 near the mounting end 611. Since the carbon brush will be worn out by friction during use, its length will become shorter and shorter. Therefore, the setting of the limiting portion 616 can prevent the carbon brush from being overused, thereby ensuring the purpose of the motor 100. The limiting portions 616 are symmetrically arranged on the opposite sides of the carbon brush body 61.
[0023] The cross section of the cavity of the carbon brush may also be square or other shapes, such as Figure 5 As shown, in another embodiment of the carbon brush 6' of the present invention, the cross section of the cavity 613' is a square structure.
[0024] Compared with the prior art, the utility model has a cavity 613 formed inside the carbon brush body 61, and the cavity 613 extends to the contact end 612 penetrating the carbon brush body 61, and a through hole 614 is formed on the outer side of the carbon brush body 61 near the mounting end 611, and the through hole 614 is connected with the cavity 613, so that the cavity 613 is connected with the outside of the carbon brush body 61, so that the heat generated by the friction between the carbon brush and the brush 5 can flow out from the cavity 613 and the through hole 614 to the outside through the internal air, thereby allowing the air flow inside and outside the carbon brush to circulate, thereby accelerating the cooling of the carbon brush, achieving good heat dissipation effect, effectively reducing the temperature of the carbon brush, and preventing high temperature from being transferred from the carbon brush to the rotor 2 and the stator 3, thereby reducing the temperature of the motor 100 during operation, and effectively extending the service life of the motor 100.
[0025] The structures of the rotor 2 and the stator 3 involved in the motor 100 of the present invention are well known to those skilled in the art and will not be described in detail herein.
[0026] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.
Claims
1. A motor carbon brush, characterized in that: It includes a carbon brush body, which has a mounting end and a contact end. A cavity is opened inside the carbon brush body, and the cavity extends toward and passes through the contact end. A through hole is provided on the outer side of the carbon brush body near the mounting end, and the through hole is connected with the cavity, so that the cavity is connected with the outside of the carbon brush body.
2. The motor carbon brush according to claim 1, characterized in that: The cross section of the cavity is circular or square.
3. The motor carbon brush according to claim 1, characterized in that: The cross-sectional area of the cavity accounts for 16%-20% of the cross-sectional area of the carbon brush body.
4. The motor carbon brush according to claim 1, characterized in that: A positioning portion is provided on the mounting end.
5. The motor carbon brush according to claim 1, characterized in that: A limiting portion is protrudingly provided on the outer side of the carbon brush body close to the mounting end.
6. The motor carbon brush according to claim 5, characterized in that: The limiting parts are symmetrically arranged on two opposite sides of the carbon brush body.
7. A motor, characterized in that: It comprises a housing, a motor bracket, a rotor, a stator, a rotating shaft, a brush and the motor carbon brush according to any one of claims 1 to 6, wherein the motor bracket, the rotor and the stator are arranged in the housing, the stator is arranged in the motor bracket, and the rotor is rotatably arranged in the motor bracket; the rotating shaft is coaxially fixed with the rotor, the brush is arranged at one end of the rotating shaft and is electrically connected to the coil of the rotor, the motor carbon brush is symmetrically arranged on the motor bracket, and an elastic element is provided between the motor carbon brush and the motor bracket so that the two carbon brushes are electrically contacted with the brush respectively.