Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 45, Problem 2SQ
Textbook Problem

When using a coil that is not designed for continuous duty, what may happen if a resistor is not added to the circuit?

To determine

What happens if a coil is used in the circuit which is not designed for continuous duty operations without adding a resistor.

Explanation of Solution

A starter is a device used to start and accelerate a motor and to limit inrush current, where it is necessary to prevent a motor from damage.

During the starting instant of a motor, the armature is stationary at the moment and no counter EMF develops. As the motor armature resistance is very low, the armature current will be maximum at the starting of a motor. The maximum current flows through the circuit coil causing damage to the installation and it can even burn out of the coil. Therefore, a current limiting resistor is used to minimize the current flow to coils or when the coils are overheating...

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