On Feb 20, 2005, at 4:39 PM, Paul G. Allen wrote:
If you wanted to cut current from the source and monitor this, you could (not that this is what the device is doing). Any coil (including those in motors) will induce current in wires connected to it /after/ it's current source has been disconnected, or if a magnetic field is passed near it. Cut the source current, and the motor becomes a sort of generator (alternator for AC motors) and a detector on the source wires can measure the speed at which it's turning, or if it's turning at all.
And it will induce a current *why*?
Most industrial and consumer motors do not have permanent magnets. In that case, a turned motor will *not* induce a returned current as there is no magnetic field to provide a change in flux.
Before continuing to speculate on electricity, please go read a basic electromagnetics textbook.
-a
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