A 240-V series motor has an armature resistanceof 0.42Ω and a series-field resistance of0.18Ω . If the speed is 500 r/min when the current is36 A, what will be the motor speed when the loadreduces the line current to 21 A? (Assume a 3-Vbrush drop and that the flux is proportional to thecurrent.)
A 240-V series motor has an armature resistanceof 0.42Ω and a series-field resistance of0.18Ω . If the speed is 500 r/min when the current is36 A, what will be the motor speed when the loadreduces the line current to 21 A? (Assume a 3-Vbrush drop and that the flux is proportional to thecurrent.)
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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Question
A 240-V series motor has an armature resistance
of 0.42Ω and a series-field resistance of
0.18Ω . If the speed is 500 r/min when the current is
36 A, what will be the motor speed when the load
reduces the line current to 21 A? (Assume a 3-V
brush drop and that the flux is proportional to the
current.)
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