Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 43, Problem 6SQ
Textbook Problem

Explain why reducing current flow to the shunt field causes the motor speed to increase.

To determine

Explain the reason for the increase in the speed of motor with the decrease of current flow to shunt field.

Explanation of Solution

The shunt field circuit in DC motor acts as a heater in motor to keep moisture out of the motor.

When the current flows to shunt field decreases, it produces less counter emf in the armature. Hence, more current will tend to flow through armature where it results in a net gain in torque and causes to increase the speed of motor...

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