QI//A 4-pole ,400 V, 1755 rpm, 60 Hz, 3-phase induction motor star connected has the following circuit model parameters: R, -0.2 ,R;' 0.1 2, X 0.5 2 X' 0.2 2, Xo- 20 2 and rotational loss 800 W (Ro is negligible). Calculate: a) The input current and efficiency of rotor. b) The mechanical power developed, gross torque and efficiency of motor. c) The maximum gross power and the slip at which it occurs when exciting circuit is omitted.

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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QI//A 4-pole ,400 V, 1755 rpm, 60 Hz, 3-phase induction motor star connected has the
following circuit model parameters: R, Q 0.2 ,R, 0.1 2, X 0.5 2 X' 0.2 2,
Xo 20 2 and rotational loss3800 W (Ro is negligible). Calculate:
a) The input current and efficiency of rotor.
b) The mechanical power developed, gross torque and efficiency of motor.
c) The maximum gross power and the slip at which it occurs when exciting circuit is
omitted.
Transcribed Image Text:QI//A 4-pole ,400 V, 1755 rpm, 60 Hz, 3-phase induction motor star connected has the following circuit model parameters: R, Q 0.2 ,R, 0.1 2, X 0.5 2 X' 0.2 2, Xo 20 2 and rotational loss3800 W (Ro is negligible). Calculate: a) The input current and efficiency of rotor. b) The mechanical power developed, gross torque and efficiency of motor. c) The maximum gross power and the slip at which it occurs when exciting circuit is omitted.
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