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A 220 V dc shunt motor develops a total torque of 100 N-M and takes 29A at 600 rpm. The armature and shunt field resistance are 0.3 ohm and 220 ohms respectively. If the speed is to be increased to 800 rpm determine the percentage reduction of the field and additional resistance to be inserted in the field circuit. The torque develop at 800 rpm is 70 N-M.

A 220 V dc shunt motor develops a total torque of 100 N-M and takes 29A at 600 rpm. The armature and shunt field resistance are 0.3 ohm and 220 ohms respectively. If the speed is to be increased to 800 rpm determine the percentage reduction of the field and additional resistance to be inserted in the field circuit. The torque develop at 800 rpm is 70 N-M.

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
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A 220 V dc shunt motor develops a total torque of 100 N-M and takes 29A at 600 rpm. The armature and shunt field resistance are 0.3 ohm and 220 ohms respectively. If the speed is to be increased to 800 rpm determine the percentage reduction of the field and additional resistance to be inserted in the field circuit. The torque develop at 800 rpm is 70 N-M.
Transcribed Image Text:A 220 V dc shunt motor develops a total torque of 100 N-M and takes 29A at 600 rpm. The armature and shunt field resistance are 0.3 ohm and 220 ohms respectively. If the speed is to be increased to 800 rpm determine the percentage reduction of the field and additional resistance to be inserted in the field circuit. The torque develop at 800 rpm is 70 N-M.
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