How do you overhaul induction motor?

Answer 1

have to install individual capacitors or capacitor banks.power factor analyzing prior to this important as well harmonic analyzing.refer wikipedia for power factor correction

most single phase motors are corrected by single capacitor parallel to motor input ,

Answer 2

efficiency is the ration of Power_Out/Power_In.

So simply take the Power out Rpm*Torque

and divide by the Power in Volts * Amps

Note: You need to you numbers found while the motor is running. Name Plate or Maximum values will not work for this.

Also the Efficiency will vary depending on the motor speed.

Answer 3

Use thicker wire in the windings, use a larger magnetic core, use low-friction bearings. These features reduce the power losses but might increase the mass of the motor.

Answer 4

turn them off