Electric brush assembly and motor

Abstract

The invention discloses an electric brush assembly and a motor. The electric brush assembly includes an electric brush (1), an electric brush sleeve (2) and an elastic pressing piece. The end, sleevedwith a sleeve cavity of the electric brush sleeve (2), of the electric brush (1) is a pressure bearing sleeving end, and the other end of the electric brush is a sliding contact end protruding from asleeve end face of the electric brush sleeve (2). According to the arrangement of the elastic pressing piece, during wearing of the sliding contact end, basically constant elastic pressure is performed at the pressure bearing sleeving end. The elastic pressing piece in the electric brush assembly can perform the basically constant elastic pressure on the electric brush to render the contact pressure between the electric brush and a commutator basically constant during wearing, so that continuous stable running of the motor is ensured. Electromagnetic sparks and work noise which are caused byinsufficient contact pressure are effectively reduced, and therefore the reliability of the motor is improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a brush 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 compression spring o...

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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