Assignment:
A three phase Y-connected 480 V (line to line) 30 hp 60 Hz four pole induction motor has the following equivalent circuit constants in Ohms-per-phase referred to the stator:
R1=0.21 R2= 0.20 X1=1.2 X2=1.1 Xp=39
The total friction windage and core losses may be assumed constant at 1340 Watts. The motor is connected directly to a 480 V source. Compute speed, shaft output torque in Nm, power in horsepower, efficiency, and terminal power factor for slips of 1, 2, and 3 %.