Question

A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 160 Nm when the rotor emf makes 120 complete cycles per minute. The windage and friction loss is 1005.30 Watt. It is assumed; the core loss is lumped together with the windage and friction loss. The total stator loss is given to be 800 Watt. Compute: 

a) Shaft power output, 

b) The copper loss in the rotor winding,

c) The input power to the motor, and 

d) The efficiency.

Answer 1