Answered: The full-load slip of 4-pole,60Hz,440v

Engineering

Electrical Engineering

The full-load slip of 4-pole,60Hz,440v

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.

Question

The full-load slip of 4-pole,60Hz,440v (line -to-line) three phase induction motor is 0.05.

i.What is the speed of the rotating stator field?What is the frequencey (in Hz) of the rotor current.

ii.When the output power of the motor is 90 hp at a speed of 1732rpm,rotational losses(which includes frictional and core losses) are 10,100W,while copper losses for both rotor and stator total 3700W.Determine the motor efficiency and line current,assuming the motor has a 0.8 pf lagging under these conditions.

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