Shaded pole AC motor question

[magnetman12003]

Hi,

I have a small shaded pole AC motor that speeds to 3,000 rpm using single phase 120 volts AC.

Say I disconnect the power wires from this motor entirely and spin the motor shaft itself by a mechanical means to 3,000 RPM.

Will the motor now act as a generator? Should electrical power be available at the power wires leading into the motor. If so just what kind of electronic energy should be present if any?

Your response will be most appreciated.

Thanks, Tom

 

[crutschow]

It will not act as a generator since there is no magnetic field without the windings being energized. The rotor is a magnetic material with no permanent field so spinning it without a field will have no effect.

If you apply ac power and then rotate it faster than synchronous speed for that particular motor (probably 3600 rpm for yours if the line is 60Hz) it should then change from a motor to a generator and force current out of the windings. But this will only add power to the connnected line. It won't work without the line.

(Some wind generators use induction motors as generators in this fashion to generate power on line. They must be disconnected from the line when the wind stops so they don't act as motors).