DC motor and carbon brush thereof

A technology of DC motors and carbon brushes, applied in circuits, current collectors, electrical components, etc., can solve problems such as complex processes, and achieve the effects of improving fluctuations, increasing differences, and reducing contact points

Inactive Publication Date: 2010-09-08
JOHNSON ELECTRIC SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of calculating the motor speed requires the use of Hall elements to sense the rotation

Method used

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  • DC motor and carbon brush thereof
  • DC motor and carbon brush thereof
  • DC motor and carbon brush thereof

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Experimental program
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Embodiment Construction

[0026] The present invention will be described below in conjunction with the accompanying drawings.

[0027] figure 1 Shown is a three-dimensional schematic diagram of a carbon brush according to an embodiment of the present invention.

[0028] see figure 1 A. A carbon brush 10 according to an embodiment of the present invention includes a carbon brush body 12 and a brush 14 fixed to the body 12 . The carbon brush body 12 is substantially hexahedral, including a front face 12a, a rear face 12b, a top face 12c, a bottom face 12d and a pair of side faces 12e. In the present invention, the distance between the front face 12a and the back face 12b of the carbon brush body 12 is defined as the length of the carbon brush body, the distance between the top surface 12c and the bottom surface 12d is the height of the carbon brush body, and the distance between the two sides 12e is the carbon brush body. The width of the body.

[0029] The brush section 14 extends from a side surfac...

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PUM

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Abstract

The invention relates to a DC motor and a carbon brush thereof. The DC motor comprises a rotor and a stator, wherein the rotor comprises a rotation shaft and a commutator which is fixed on the rotation shaft, the stator comprises at least a pair of carbon brushes, the carbon brush comprises a contact surface which is used for being contacted with an arc surface of the commutator, the contact surface is of a V shape in the direction which is parallel to the axis of the rotation shaft, and the contact surface is inclined relatively to the axis direction of the rotation shaft, so the initial contact between the contact surface and the arc surface of the commutator is of the point contact, the fluctuation of the motor current can be improved, and the vibration source can be conveniently reduced so as to realize the noise reduction; and moreover, the contact points between the carbon brush and the commutator can be reduced so as to increase dBA difference value between a fundamental wave and a harmonic wave, so the speed of the motor can be calculated without a Hall element.

Description

【Technical field】 [0001] The invention relates to a direct current motor, in particular to a carbon brush of the direct current motor. 【Background technique】 [0002] In DC motors, noise is an important indicator to measure the performance of the motor. [0003] The traditional noise reduction technology is to use vibration-absorbing glue to stick to the vibration source point. This kind of process is complicated and requires additional vibration-absorbing glue. [0004] Some motors, such as those used in car windows, need to calculate the motor speed to obtain the degree of opening of the window. The traditional method of calculating the rotational speed of the motor needs to use Hall elements to sense the rotation of the motor to calculate the rotational speed of the motor. The process is complicated and additional Hall elements are required. 【Content of invention】 [0005] The invention provides a new type of carbon brush, which includes a top surface, a bottom surfac...

Claims

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Application Information

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IPC IPC(8): H01R39/18H02K13/00
Inventor 刘清式黄耀龙金昌林雷远东
Owner JOHNSON ELECTRIC SHENZHEN
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