Problem #7A three-phase, 4-pole, 60-Hz induction motor is runs at a no-load speed of 1790RPM and a full-load speed of 1720 RPM. Calculate the slip and the electricalfrequency of the rotor at no-load and full-load conditions. What is the speedregulation of this motor?

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Answered: Problem #7 A three-phase, 4-pole, 60-Hz…

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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Example -4. A three-phase. 60-Hz induction motor runs at 890 r/min at no load and at 840 r/min at full load. (a) How many poles does this motor have? (b) What is the slip at rated load? (c) What is the speed at one-quarter of the rated load? (d) What is the rotor's electrical frequency at one-quarter of the rated load?
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Problem #7 A three-phase, 4-pole, 60-Hz induction motor is runs at a no-load speed of 1790 RPM and a full-load speed of 1720 RPM. Calculate the slip and the electrical frequency of the rotor at no-load and full-load conditions. What is the speed regulation of this motor?