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Question:

How to calculate AC motor efficiency at no load?

How to calculate AC motor efficiency at no load?

Answer:

Naresh, With the motor on no load, none of the energy being consumed by the motor is being gainfully used, so the efficiency must be zero. You should also remember that with a motor on no load, the power factor is very low.
Yo okorder
efficiency is zero because the output power is zero. however, there still is input power which is wasted as losses in the motor (mechanical losses, copper losses)

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