• A 120-V shunt motor has R₁ = 0.25 0 and Rfw = 80 2. The motor takes 4 A at a no-load speed of 1500 rpm. If the motor is to develop a torque of 20 N-m at a speed of 2000 rpm, determine the external resistance that must be added in series with the field winding. (352) • If the rotational loss is proportional to the speed, determine the efficiency and the horsepower rating of the motor at 2000 rpm.

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 120-V shunt motor has R₁ = 0.25 0 and Rfw = 80
2. The motor takes 4 A at a no-load speed of 1500
rpm. If the motor is to develop a torque of 20 N-m at
a speed of 2000 rpm, determine the external
resistance that must be added in series with the field
winding. (352)
• If the rotational loss is proportional to the speed,
determine the efficiency and the horsepower rating
of the motor at 2000 rpm.
Transcribed Image Text:• A 120-V shunt motor has R₁ = 0.25 0 and Rfw = 80 2. The motor takes 4 A at a no-load speed of 1500 rpm. If the motor is to develop a torque of 20 N-m at a speed of 2000 rpm, determine the external resistance that must be added in series with the field winding. (352) • If the rotational loss is proportional to the speed, determine the efficiency and the horsepower rating of the motor at 2000 rpm.
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