作者: Toshihito Shirai , Koichi Futsuhara , Junpei Tajima
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摘要: The present invention relates to a sensor for verifying that motor has stopped rotating including rotation due inertia. Respective signal input lines are connected three power supply of phase AC motor. A high frequency current is supplied one the lines, and difference in flowing other two sampled from made an output section. subjected threshold value operation processing circuit, resultant on-delay circuit as presence judgment output.