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A long-shunt compound motor 450 volts has an armature resistance and series-field resistance are 0.5N and 0.252 respectively. The full-load speed is 1,800rpm when the armature current is 25Amp. a) At what speed will the motor operate at no load if the armature current drops to 5 amperes with a corresponding drop in flux to 85% of the full-load value? Assume a brush drop of 5volts at full-load and 2.5volts at no load b) Calculate the percent speed regulation of the motor.

A long-shunt compound motor 450 volts has an armature resistance and series-field resistance are 0.5N and 0.252 respectively. The full-load speed is 1,800rpm when the armature current is 25Amp. a) At what speed will the motor operate at no load if the armature current drops to 5 amperes with a corresponding drop in flux to 85% of the full-load value? Assume a brush drop of 5volts at full-load and 2.5volts at no load b) Calculate the percent speed regulation of the motor.

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 long-shunt compound motor 450 volts has an armature resistance and series-field resistance are 0.5N and 0.252 respectively. The full-load speed is 1,800rpm when the armature current is 25Amp. a) At what speed will the motor operate at no load if the armature current drops to 5 amperes with a corresponding drop in flux to 85% of the full-load value? Assume a brush drop of 5volts at full-load and 2.5volts at no load b) Calculate the percent speed regulation of the motor.
Transcribed Image Text:A long-shunt compound motor 450 volts has an armature resistance and series-field resistance are 0.5N and 0.252 respectively. The full-load speed is 1,800rpm when the armature current is 25Amp. a) At what speed will the motor operate at no load if the armature current drops to 5 amperes with a corresponding drop in flux to 85% of the full-load value? Assume a brush drop of 5volts at full-load and 2.5volts at no load b) Calculate the percent speed regulation of the motor.
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