Answered: A 75 kW, 440 V, 3-phase, 6-pole, 50 Hz…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 75 kW, 440 V, 3-phase, 6-pole, 50 Hz wound rotor induction motor has a full load slip of 0.04 and the slip at maximum torque of 0.2 when operating at rated voltage and frequency with rotor winding short circuited at the slip rings. Assume the stator resistance and rotational losses to be negligible.power factor 0.8. Find
(a) maximum torque (b) starting torque (c) full load copper loss. The rotor resistance is now doubled by adding an external series resistance. Determine (d) slip at full load (e) full-load torque (f) slip at maximum torque.

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