同时，固定地基上有一个(供电的)金属环，房子通过绕着此环旋转的导电刷来获得电能。
Electricity, meanwhile, is delivered via a conductive brush that sweeps around a metal ring in the stationary base.
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.
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