A 3 phase, 400 V, 50 Hz, 4 pole, star connected SCIM has the following per phase constants
in ohms referred to stator:
r1= 0.15, x1=0.45, x2=0.45, Xm= 28.5
Rotational losses= 400W.
Compute stator current, rotor speed, output torque and efficiency when the motor is operated at
rated voltage and frequency at 4% slip.
a. State current,
b. Synchronuos speed
c. Air gap power,
Rotor power developed =(1-s)Pg =(1-0.04)(44.7246)kW=42.936 kW
Rotational loss =400 W = 0.4 kW
Shaft power = 42.936 -0.4 =42.536 kW
d. Total power output = 42.536 kW
Total power input =