A 400 V, 50 Hz, 4-pole, 3-phase, star-connected induction motor has per phase stator impedance Z, = (0.7 + j0.3) 2 and per phase rotor impedance referred to stator side Z = %3D (0.08 + j0.3) 2. The per phase magnetizing reactance is 10 2 and resistance representing core-loss is 50 2. The slip is 4%. Using approximate equivalent circuit, calculate (i) stator current and stator power factor, (ii) developed torque, and (iii) gross efficiency.

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Question

A 400 V, 50 Hz, 4-pole, 3-phase, star-connected induction motor has per phase stator
impedance Z, = (0.7 + j0.3) 2 and per phase rotor impedance referred to stator side Z =
%3D
(0.08 + j0.3) 2. The per phase magnetizing reactance is 10 2 and resistance representing
core-loss is 50 2. The slip is 4%. Using approximate equivalent circuit, calculate (i) stator
current and stator power factor, (ii) developed torque, and (iii) gross efficiency.
Transcribed Image Text:A 400 V, 50 Hz, 4-pole, 3-phase, star-connected induction motor has per phase stator impedance Z, = (0.7 + j0.3) 2 and per phase rotor impedance referred to stator side Z = %3D (0.08 + j0.3) 2. The per phase magnetizing reactance is 10 2 and resistance representing core-loss is 50 2. The slip is 4%. Using approximate equivalent circuit, calculate (i) stator current and stator power factor, (ii) developed torque, and (iii) gross efficiency.
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