汽车启动机电刷具有短时工作制、电流密度大及接触压降小的特点。
Describing the specialities of the starting motor brushes are of short-time duty system, big current density and the contact voltage drop must be as small as possible.
直流电动机中的电刷能够指示直流励磁磁极的位置，又可以控制电枢电流的相位，直流电动机应是箝位电动机。
In DC motor, the locality of axis of armature MMF was determined by the brush position, here the brush possessed a function of clamping.
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