Electric brush installing assembly and motor

Abstract

The invention discloses an electric brush installing assembly and a motor. The electric brush installing assembly comprises a fixed installing box (3), an electric brush (1) arranged inside a box cavity of the fixed installing box (3) and an elastic pressing piece, the elastic pressing piece is installed in the fixed installing box (3) and applies elastic pressure to the electric brush (1), and the elastic pressure is kept generally constant during the contact and wear process. The elastic pressing piece in the electric brush assembly can apply the generally constant elastic pressure to the electric brush, so that the contact pressure of the elastic brush between the elastic brush and a commutator can remain the same, and a motor can constantly and stably operate, and electromagnetic sparkand working noises which are caused by insufficient contact pressure can be effectively reduced, thereby improving the reliability of the motor. In addition, it is due to the fact that the elastic pressing piece is fixedly arranged in the fixed installing box, the assembling stability of the electric installing assembly is better, and the working stability of the motor can be improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a brush installation assembly and a motor. Background technique [0002] Brushed motors require sliding frictional contact between the brushes and the commutator to commutate the winding current to ensure continuous smooth operation of the motor. In order to ensure good contact between the brush and the commutator, it is necessary to maintain a certain contact pressure between the two. Therefore, in the existing brushed motors, a helical compression spring or torsion spring capable of exerting elastic pressure is usually provided at the end of the brush. In the process of continuous wear of the brush, the compression spring or torsion spring can always push The brushes are pressed against the commutator, so as to ensure that the brushes and the commutator are pressed against each other to achieve good conduction. [0003] However, in the case of using the above-mentioned compres...

AI Technical Summary

Problems solved by technology

[0003] However, in the case of using the above-mentioned compression spring or torsion spring to apply elastic pressure to the brush, the contact pressure between the brush and the commutator varies greatly from the beginning of use to the end of its service life, that is, the fluctuation range of the contact pressure larger

For the contact pressure, if it is too large, the friction between the brush and the commutator will increase, and the brush will wear out faster, its life will be shortened, or it will be stuck, which will cause the motor to heat up. louder noise

When the contact pressure is too small, it is prone to poor contact between the brush and the commutator, resulting in unstable motor speed or electromagnetic sparks

In short, too large or too small contact pressure between the brush and the commutator will affect the normal operation of the motor, that is, the reliability will be greatly reduced

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