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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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A 230 V DC shunt motor has a full-load efficiency of 89.9%. Rated (full) load is 40 hp. Motor losses, expressed as a percentage of output power are as follows: rotational losses - 3.7%; armature copper loss - 3.9%; and, field copper loss - 2.5%. Stray load losses can be neglected. At full load, the motor speed is 1150 rpm. Neatly sketch an equivalent circuit for the DC shunt motor, and determine: the field current; the armature current at full load; the armature current at half load; the armature current at no load; and, the shaft torque at full load. a. b. с. d. e. 18
Transcribed Image Text:A 230 V DC shunt motor has a full-load efficiency of 89.9%. Rated (full) load is 40 hp. Motor losses, expressed as a percentage of output power are as follows: rotational losses - 3.7%; armature copper loss - 3.9%; and, field copper loss - 2.5%. Stray load losses can be neglected. At full load, the motor speed is 1150 rpm. Neatly sketch an equivalent circuit for the DC shunt motor, and determine: the field current; the armature current at full load; the armature current at half load; the armature current at no load; and, the shaft torque at full load. a. b. с. d. e. 18
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