The rotor of a four-pole, 50 Hz slip-ring induction motor has a resistance of 0.2 Q per phase and runs at 1425 rpm at full-load. Determine the external resistance per phase which must be added to reduce the speed to 1200 rpm, the torque remaining same in both the cases.

The rotor of a four-pole, 50 Hz slip-ring induction motor has a resistance of 0.2 Q per phase and runs at 1425 rpm at full-load. Determine the external resistance per phase which must be added to reduce the speed to 1200 rpm, the torque remaining same in both the cases.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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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.

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The rotor of a four-pole, 50 Hz slip-ring induction motor has a resistance of 0.2 0 per phase and runs at 1425 rpm at full-load. Determine the external resistance per phase which
must be added to reduce the speed to 1200 rpm, the torque remaining same in both the cases.

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