| 摘要 |
The present invention disclosed a detector for sensing the rotational movement of an electric motor in stand-by mode, comprising a control circuit, a thyristor, and a power supply circuit; wherein, one output terminal of said control circuit is connected to the gate of said thyristor, and wherein said power supply circuit, electric motor and thyristor are connected in series; wherein said detector further includes a sensing circuit and an indicator light, said sensing circuit for detecting whether the loop of said power supply circuit, electric motor and thyristor are conducting; wherein one output terminal of said sensing circuit is connected to said control circuit for providing a feed-back signal to said control circuit; wherein said control circuit has an output terminal connected to said indicator light so as to control an on/off state of the indicator light.
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