Copper-graphite composite brush for motor

A composite material and graphite technology, which is applied in the direction of circuits, current collectors, electrical components, etc., can solve the problems of rated current, low speed, complicated manufacturing process, high quality of copper powder, etc., and achieve increased copper hardness, increased mass fraction, and improved Effect of Quality Score

Inactive Publication Date: 2011-11-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN101379680A discloses a copper-graphite brush for motors (Xiao Linbo, Manufacturing method of metal-graphite brush materials for motors, 2009, CN101379680A), in which the copper powder is 45wt%, and its resistivity and wear amount can reach 0.012μΩ r

Method used

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  • Copper-graphite composite brush for motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: 50 parts of graphite powder with a particle size of less than 300 meshes, 25 parts of graphite powder with a purity of 99.5%, and 0.4 parts of electrolytic copper powder with a particle size of less than 400 meshes, with a purity of 95%, and a particle size of less than 300 mesh silicon powder and 7 parts of asphalt powder with a particle size of less than 400 mesh are mixed uniformly, and then uniformly mixed according to the traditional powder metallurgy manufacturing copper graphite electric brush process, and then pressed and sintered. After testing, its resistivity is 0.41μΩ·m, Rockwell hardness is 96.8, peripheral speed is 15m / s, wear rate is 0.06mm / 50h, friction coefficient is 0.20, and the total voltage drop of a pair of brushes is 1.92V. Rated current density is 15A / cm 2 .

Embodiment 2

[0014] Example 2: According to mass parts, 80 parts of graphite powder with a particle size of less than 300 mesh, 50 parts with a purity of 99.5%, a particle size of less than 400 mesh, 1.5 parts with a purity of 95%, and a particle size of less than 300 mesh silicon powder and 18 parts of asphalt powder with a particle size of less than 400 mesh are mixed uniformly, and then uniformly mixed according to the traditional powder metallurgy manufacturing copper graphite electric brush process, pressed and sintered. After testing, its resistivity is 0.09μΩ·m, Rockwell hardness is 90, peripheral speed is 15m / s, wear rate is 0.06mm / 50h, friction coefficient is 0.21, and the total voltage drop of a pair of brushes is 0.5V. Rated current density is 20A / cm 2 .

Embodiment 3

[0015] Example 3: According to the number of parts by mass, 60 parts of graphite powder with a particle size of less than 300 mesh, 35 parts with a purity of 99.5%, a particle size of less than 400 mesh, 1.0 part with a purity of 95%, and a particle size of less than 300 mesh silicon powder and 13 parts of asphalt powder with a particle size of less than 400 mesh are mixed uniformly, and then uniformly mixed according to the traditional powder metallurgy manufacturing copper-graphite electric brush process, pressed and sintered. After testing, its resistivity is 8.9μΩ·m, Rockwell hardness is 69.2, peripheral speed is 15m / s, wear rate is 0.03mm / 50h, friction coefficient is 0.20, and the total voltage drop of a pair of brushes is 2.8V. Rated current density is 15A / cm 2 .

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Abstract

The invention discloses a low-cost and high-performance copper-graphite composite material electric brush. The electric brush is made of graphite powder, copper powder, silicon powder and asphalt binder raw materials, which are first stirred and mixed through the traditional powder metallurgy copper-graphite electric brush process. It is manufactured by post-pressing and re-sintering process, the process and material cost of the present invention are low, the performance of the brush is significantly improved, and it can meet the use requirements of the commutator and the brush used in the slip ring motor.

Description

Technical field [0001] The invention belongs to the field of electrical contact materials, and specifically relates to a copper-graphite composite material brush for motors. Background technique [0002] Copper-graphite composite brushes are mainly used in low-voltage DC motors, AC asynchronous motor collector rings and commutators used in the automotive, aviation, and electrical industries, and collector rings and commutators of automobile and motorcycle starters and synchronous motors. The copper and graphite phases in the copper-graphite composite brushes respectively play the requirements of electrical conductivity and improve wear resistance and service life. However, there is a contradiction between the two using traditional powder metallurgy technology, that is, by increasing the copper content in the brush, It can improve the conductivity requirements, but reduce the wear resistance and service life, and vice versa. In order to obtain good electrical performance and wear...

Claims

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Application Information

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IPC IPC(8): H01R39/20
Inventor 熊信柏黄剑锋曾燮榕邹继兆谢盛辉曹丽云王勇
Owner SHAANXI UNIV OF SCI & TECH
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