Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 54, Problem 3SQ
Textbook Problem

How is the AC frequency controlled in an alternator?

To determine

Explain the control of AC frequency in an alternator.

Explanation of Solution


The alternator is an AC generator. The alternator’s speed depends on the frequency of the supply current and number of poles of the alternator.

Write the expression to find the alternator’s speed as follows:

RPM=60×HertzPair of poles (1)


Hertz is the unit of frequency of supply current

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