针对无刷直流电机转子位置检测,提出了一种新颖的反电动势过零点检测方法及其电路实现,与现有反电势法相比,不需要对相电压进行滤波,不会带来相移问题,因此也无需进行补偿[1-3].实验中,即使速度低至100 r/m,该方法依然有效,而目前普遍采用的反电势法只能在速度大于150 r/m条件下有效,扩展了反电动势法的适用范围.%This paper presented a new back-electromotive force( EMF) detection technique which provided wide range control for brushless dc motor( BLDCM) drives and implemented it using electronic circuit.it didn' t need to filter the phase voltage,and wouldn' t bring phase shift problem. The effectiveness of the proposed method was demonstrated through hardware results . After experiment, it was proved that this method could work well at the speed down to 100 r/m. This method was used in the sensorless control of BLDCM and was proved to be of great practical value.
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