Porous electric brush

Abstract

The invention relates to a porous electric brush, wherein through holes are formed on an electric brush body. The porous electric brush comprises the electric brush body and a lead fixedly connected with the electric brush body. The porous electric brush is characterized in that: the through holes are formed on the electric brush body and are the through holes passing through an arc bottom face of the electric brush body and the face opposite to the bottom face. The porous electric brush has the advantages of noise-reducing and temperature rise-reducing functions and high wear resistance on the premise of guaranteeing the comprehensive technical indexes of electrical property.

Description

Technical field [0001] The invention relates to a metal graphite brush or carbon graphite brush with through holes provided on a brush body. technical background [0002] At present, the technical indicators of noise, temperature rise, service life and electrical performance are mutually restricted and contradictory during the use of brushes. To ensure good electrical performance, other technical indicators must be sacrificed. [0003] The high-speed relative rotational movement between the brush, commutator and slip ring generates frictional noise and frictional heat. In addition, high-current reversing sparks accelerate the galvanic wear of the brush, commutator and slip ring and reduce service life. In order to improve the service life, it is necessary to increase the resistance of the brush appropriately and reduce the friction coefficient of the brush. The increase of the resistance will lead to the increase of the heat generation of the brush, so that the temperature ...

AI Technical Summary

Problems solved by technology

[0003] The high-speed relative rotation between the brushes, commutator and slip rings generates friction noise and friction heat. In addition, the high-current commutation sparks accelerate the electric erosion and wear of brushes, commutators and slip rings, reducing the service life

In order to improve the service life, it is necessary to appropriately increase the resistance of the brush to reduce the friction coefficient of the brush, and the increase in resistance will lead to an increase in the calorific value of the brush, so that the temperature rise index will not be guaranteed. It will cause the brushes, commutator, and slip rings to heat up. The result of exceeding the allowable temperature is to reduce the service life of the whole machine, and at the same time sacrifice the electrical performance of some brushes.

To ensure the electrical performance of the brush, it is necessary to increase the conductivity of the brush, which will lead to an increase in the friction coefficient and reduce the service life of the commutator and slip ring

[0004] High-speed relative rotation motion, friction noise is also not allowed for high-end brush products. If you want to reduce noise by impregnating lubricant and improving the porosity of the material, the effect is also limited

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