本文采用反电动法控制永磁直流无刷电机，是通过检测反电动势过零点获得转子位置实现无传感器控制。
Using Back-EMF method to control BLDCM, it can realize sensor-free control method by detecting the zero point of EMF in this paper.
给出一种无互耦情况下圆形阵列天线零点综合的有效方法，分析了互耦对零点综合的影响，并采用互阻抗近似的方法在考虑互耦时对零点进行控制。
A null synthesis method for circular array without coupling is presented, and the effects of coupling to null are also analyzed by the method of moments.
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