Hi, can someone please explain why measured mechanical power might be considerably lower than the value calculated using Rr and Xr?(in a 3 phase induction motor)Thanks for your help!
In any motor the measured mechanical power is always lower then calculated power because of losses such as copper losses, iron losses and friction.
Not sure of your Rr and Xr. An AC motor has slip. Think of it this way: The electricity is moving at a speed around the outside of the motor. This moving electric field is felt by the moving part and it now moves. Because no motor is 100% efficient, the moving part lags the speed of the rotating field. This slip also provides the torque of the motor.
