The rotor of a 4-pole, 50 Hz, 3-phase slip-ring induction motor has a resistance of 0.252/phase and runs at 1440 r.p.m. on full-load. Calculate the external resistance per phase which must be added to lower the speed to 1200 r.p.m. , the torque remaining constant in both cases. Ans[ 12]

The rotor of a 4-pole, 50 Hz, 3-phase slip-ring induction motor has a resistance of 0.252/phase and runs at 1440 r.p.m. on full-load. Calculate the external resistance per phase which must be added to lower the speed to 1200 r.p.m. , the torque remaining constant in both cases. Ans[ 12]

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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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

The rotor of a 4-pole, 50 Hz, 3-phase slip-ring induction motor has a resistance of 0.252/phase
and runs at 1440 r.p.m. on full-load. Calculate the external resistance per phase which must be
added to lower the speed to 1200 r.p.m. , the torque remaining constant in both cases. Ans[ 12]

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