Exercise 6.30a• A 120-V shunt motor has R₁ = 0.25 Q and Rf = 80Q. The motor takes 4 A at a no-load speed of 1500rpm. If the motor is to develop a torque of 20 N-m ata speed of 2000 rpm, determine the externalresistance that must be added in series with the fieldwinding. (352)• If the rotational loss is proportional to the speed,determine the efficiency and the horsepower ratingof the motor at 2000 rpm.

(1): Step 1: Step 2: Step 3: Step 4: (2):Step 1: Step 2:

Answered: Exercise 6.30 a • A 120-V shunt 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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