(a) A four-pole three-phase induction motor operate at 50-Hz. It has the no-load speed of 2940 rpm and the full-load speed of 2860 rpm. (i) Calculate the motor speed. (ii) Calculate the motor no-load slip and the electrical frequency of the rotor. (ii) Calculate the motor full-load slip and the electrical frequency of the rotor. (iv) Determine the speed regulation of this motor.

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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(a) A four-pole three-phase induction motor operate at 50-Hz. It has the no-load speed of
2940 rpm and the full-load speed of 2860 rpm.
(i) Calculate the motor speed.
(ii) Calculate the motor no-load slip and the electrical frequency of the rotor.
(ii) Calculate the motor full-load slip and the electrical frequency of the rotor.
(iv) Determine the speed regulation of this motor.
(b) Explain the DC series motor basic principle of operation and discuss the source of field
flux needed for the motor operation. State the advantages of DC motor over the other
types of DC motors.
Transcribed Image Text:(a) A four-pole three-phase induction motor operate at 50-Hz. It has the no-load speed of 2940 rpm and the full-load speed of 2860 rpm. (i) Calculate the motor speed. (ii) Calculate the motor no-load slip and the electrical frequency of the rotor. (ii) Calculate the motor full-load slip and the electrical frequency of the rotor. (iv) Determine the speed regulation of this motor. (b) Explain the DC series motor basic principle of operation and discuss the source of field flux needed for the motor operation. State the advantages of DC motor over the other types of DC motors.
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