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Exercise 6.30 a • A 120-V shunt motor has R₁ = 0.25 Q and Rf = 80 Q. 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.

Exercise 6.30 a • A 120-V shunt motor has R₁ = 0.25 Q and Rf = 80 Q. 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.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Exercise 6.30 a • A 120-V shunt motor has R₁ = 0.25 Q and Rf = 80 Q. 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:Exercise 6.30 a • A 120-V shunt motor has R₁ = 0.25 Q and Rf = 80 Q. 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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