Answer to Question #203134 in Electrical Engineering for Anusha

Question #203134

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.


1
Expert's answer
2021-06-07T05:46:24-0400

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

Output torque,

d. Total power output = 42.536 kW

Total power input =


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