A three phase, four- pole, 30-hp, 220-V, 60-Hz, Y-connected induction motor draws a current of 77 A from the line source at a power factor of 0.88. At this operating condition, the motor losses are known to be the following:
Stator copper losses = 1033 W Stator core losses = 485 W
Rotor copper losses = 1299 W Rotational losses = 540 W
Determine the power transferred across the air gap, the internally developed torque, the slip, the horsepower output, the motor speed in rpm, the torque corresponding to the rotational losses, and the efficiency of operation at the stated condition.
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