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A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance is 50 2 and connected to the armature resistance of 0.25 . The total iron, friction and windage losses of the motor is 2 kW. (i) With proper label, sketch an equivalent circuit of the DC motor. (ii) Calculate the armature current. (iii) Calculate the difference of motor efficiency if the motor operates at no-load and full-load. At which condition the motor efficiency is the highest? Justify your answer.

A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance is 50 2 and connected to the armature resistance of 0.25 . The total iron, friction and windage losses of the motor is 2 kW. (i) With proper label, sketch an equivalent circuit of the DC motor. (ii) Calculate the armature current. (iii) Calculate the difference of motor efficiency if the motor operates at no-load and full-load. At which condition the motor efficiency is the highest? Justify your answer.

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 DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance is 50 2 and connected to the armature resistance of 0.25 Q. The total iron, friction and windage losses of the motor is 2 kW. (i) With proper label, sketch an equivalent circuit of the DC motor. (ii) Calculate the armature current. (iii) Calculate the difference of motor efficiency if the motor operates at no-load and full-load. At which condition the motor efficiency is the highest? Justify your answer.
Transcribed Image Text:A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance is 50 2 and connected to the armature resistance of 0.25 Q. The total iron, friction and windage losses of the motor is 2 kW. (i) With proper label, sketch an equivalent circuit of the DC motor. (ii) Calculate the armature current. (iii) Calculate the difference of motor efficiency if the motor operates at no-load and full-load. At which condition the motor efficiency is the highest? Justify your answer.
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