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zero speed switch

zero speed switch

zero speed switch

(OP)
Is there any way to use the voltage from a coasting down motor for a zero-speed detection switch instead of installing a mechanical one?

RE: zero speed switch

It won't be reliable because the voltage will usually drop to zero, or very close to zero long before the motor coasts to a stop.  

Once an induction motor is de-energized, it loses it excitation source and the voltage decays rapidly within a few cycles.   There might be a very small voltage due to magnetization of the iron, but I don't think you could count on it.  

Not that I've ever tried it.  

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