Type your question here The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load. Calculate the extemal resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?

Type your question here The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load. Calculate the extemal resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?

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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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per
phase and runs at 1440 rpm at full-load. Calculate the external resistance per phase, which
must be added to lower the speed to 1200 rpm, torque remaining the same?
2- Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at

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