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无刷直流电机位置检测

Other Parts Discussed in Thread: CONTROLSUITE

 我想询问下:无刷直流电机端电压过零检测后,要进行30°延迟才进行换向,我想询问下如何检测到这个30°的信号差呢?
我所能检测的也就开关管的信号,和过零信号,如何判断之间的信号差是30°呢? 能解释下么?