A 250 V dc shunt motor takes a current of 30A on a certain load. R= 12 and Rh= 125 Q. Find the resistance to be inserted in series with the armature to reduce the speed to 60% of its original value if the load torque is constant.

A 250 V dc shunt motor takes a current of 30A on a certain load. R= 12 and Rh= 125 Q. Find the resistance to be inserted in series with the armature to reduce the speed to 60% of its original value if the load torque is constant.

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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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

A 250 V de shunt motor takes a current of 30A on a certain load. R= 12 and Rsh=
125 Q. Find the resistance to be inserted in series with the armature to reduce the
speed to 60% of its original value if the load torque is constant.

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