无电刷电机精确地控制旋转的钻头，它具有可编程编码器，每360度计数超过57,000次。
The brushless motor precisely controls the rotation of the auger, with a programmable encoder that provides more than 57,000 counts per 360 degree revolution.
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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