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A dc series motor takes 18 A from a 220 V main and runs at a speed of 750 rpm. When this motor is run as a generator with its field separately excited, it generates an emf of 160 V at a speed of 900 rpm with 4 A as field current and it has been observed that the characteristic is linear from 4 A to 22 A. Calculate the speed of the motor when the series field is shunted by a 2 ohm resistance and the load torque is reduced 60 %. The motor has an armature resistance of 0.5 ohm and field resistance of 1 ohm. Neglect the effect of armature reaction.

A dc series motor takes 18 A from a 220 V main and runs at a speed of 750 rpm. When this motor is run as a generator with its field separately excited, it generates an emf of 160 V at a speed of 900 rpm with 4 A as field current and it has been observed that the characteristic is linear from 4 A to 22 A. Calculate the speed of the motor when the series field is shunted by a 2 ohm resistance and the load torque is reduced 60 %. The motor has an armature resistance of 0.5 ohm and field resistance of 1 ohm. Neglect the effect of armature reaction.

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 dc series motor takes 18 A from a 220 V main and runs at a speed of 750 rpm. When this motor is run as a
generator with its field separately excited, it generates an emf of 160 V at a speed of 900 rpm with 4 A as field current
and it has been observed that the characteristic is linear from 4 A to 22 A. Calculate the speed of the motor when the
series field is shunted by a 2 ohm resistance and the load torque is reduced 60 %. The motor has an armature
resistance of 0.5 ohm and field resistance of 1 ohm. Neglect the effect of armature reaction.

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