Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 42, Problem 7SQ
Textbook Problem

Why is the PFR polarized with a DC coil?

To determine

Explain the reason for polarization of PFR with a DC coil.

Explanation of Solution

The polarized field frequency relay (PFR) is responsible for sensing the rotor speed of the synchronous motor and controlling the operating condition of the field contactor. It consists of two separate coils, one is the DC coil and other is the AC coil.

The DC coil of the relay is connected to the DC source excitation...

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