A 6-pole, 50 Hz., 3-phase induction motor running on fullload develops a useful torque of 175 Nm when the rotor e.m.f. makes120 complete cycles per minute . Calculate the shaft power output,If the mechanical torque lost in friction and that for core-loss is15 Nm , Compute :
(a) The copper loss in the rotor winding.
(b) The input to the motor and the efficiency.
The total stator losses is given to be 1000W.