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Question:

What happens when a motor is spun faster than its rated RPM?

I have this AC single phase motor, 115 volts at 1800 RPM. If i spin the shaft faster than 1800 RPM will the voltage stay the same, increase, or decrease around 115 volts?

Answer:

voltage will increase and the motor may burn itself out
how r u going yo make it go faster a motor speed is set to its frequency. what will u be alterring to achieve a higher speed
Also, the mechanical design of the motor may not be designed for such speed. Vibration and wear may decrease the life of the motor without enough load to slow it down. The motor may start to screech from such vibration and oscillation.
an AC motor is not happy when out of phase with the applied AC, and if you spin it faster than the 1800 RPM is will soon be out of phase with the AC power and the motor will fight to get back into phase with the applied AC power. if you do this speed up of the motor with enough force, you will probably burn out the motor, just as if you put on too high a load on the motor.

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