A 6-pole, wound induction motor operates from a 3-phase , 50 Hz supply. The rotor parameters are R2=0.192/phase and X2=0.552/phase. Calculate the speed at which maximum torque occurs and the value of external resistance necessary in the rotor circuit from this torque to occur the starting.

A 6-pole, wound induction motor operates from a 3-phase , 50 Hz supply. The rotor parameters are R2=0.192/phase and X2=0.552/phase. Calculate the speed at which maximum torque occurs and the value of external resistance necessary in the rotor circuit from this torque to occur the starting.

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

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

A 6-pole, wound induction motor operates from
a 3-phase, 50 Hz supply. The rotor parameters
are R2=0.192/phase and X2=0.552/phase.
Calculate the speed at which maximum torque
occurs
and the value of external resistance necessary
in the rotor circuit from this torque to occur the
starting.
Ans[800r.p.m., 0.492/phase]

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