Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 42, Problem 6SQ
Textbook Problem

What influence do both of the polarized field frequency relay (PFR) coils exert on the normally closed contact?

To determine

Explain the influence exerted on the normally closed contact by the polarized field frequency relay coils.

Explanation of Solution


The starting of the synchronous motor is accomplished by accelerating the motor to very high possible speed from the squirrel cage winding and then the DC excitation is provided to the field circuit. A polarized field frequency relay and a reactor are the two components that are responsible for applying and removing of the field excitation...

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