A 6-pole, 50 Hz, 3-phase induction motor has rotor resistance and reactance per phase of 0.0 and 0.1 2 respectively. At what speed is the torque maximum? What must be the value of exte- rotor resistance per phase to produce two-third of the maximum torque at starting? Ans[800 r.p.m; 0.0182]

A 6-pole, 50 Hz, 3-phase induction motor has rotor resistance and reactance per phase of 0.0 and 0.1 2 respectively. At what speed is the torque maximum? What must be the value of exte- rotor resistance per phase to produce two-third of the maximum torque at starting? Ans[800 r.p.m; 0.0182]

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

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

A 6-pole, 50 Hz, 3-phase induction motor has rotor resistance and reactance per phase of 0.022
and 0.1 2 respectively. At what speed is the torque maximum? What must be the value of external
rotor resistance per phase to produce two-third of the maximum torque at starting?
Ans[800 r.p.m; 0.0182]

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