Question

A 3 phase, 460V, 60Hz, 6-pole induction motor has the following equivalent circuit parameters per phase:

R1 = 0.2 ohms R2 = 0.28 ohms X1 = X2 = 1.055 ohms Xm = 33.9 ohms

The no load losses, comprising friction, windage, and iron losses equal 26W. The motor is coupled to a load and connected to a 460V supply, and the rotor speed is found to be 1156 RPM.

For this motor connected to a 460V supply calculate the following:

a. The starting torque

b. The slip at which it develops maximum torque

c. The maximum torque it develops

Answer 1

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