ااا 1. A six-pole, three-phase induction motor runs at970 rev/min at a certain load. If the stator is con-nected to a 50 Hz supply, find the percentageslip at this load.2.A three-phase, 50 Hz induction motor has eightpoles. If the full load slip is 2.5%, determine(a) the synchronous speed, (b) the rotor speed,and (c) the frequency of the rotor e.m.f.s.3. A three-phase induction motor is supplied froma 60 Hz supply and runs at 1710 rev/min whenthe slip is 5%. Determine the synchronousspeed.

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Answered: 1. A six-pole, three-phase induction…

1. A six-pole, three-phase induction motor runs at 970 rev/min at a certain load. If the stator is con- nected to a 50 Hz supply, find the percentage slip at this load.

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

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

ااا

1. A six-pole, three-phase induction motor runs at
970 rev/min at a certain load. If the stator is con-
nected to a 50 Hz supply, find the percentage
slip at this load.
2.
A three-phase, 50 Hz induction motor has eight
poles. If the full load slip is 2.5%, determine
(a) the synchronous speed, (b) the rotor speed,
and (c) the frequency of the rotor e.m.f.s.
3. A three-phase induction motor is supplied from
a 60 Hz supply and runs at 1710 rev/min when
the slip is 5%. Determine the synchronous
speed.

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