Electric Motor Control
Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 54, Problem 1SQ
To determine

Write the formula for finding the speed of an AC squirrel cage induction motor.

Expert Solution & Answer
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Answer to Problem 1SQ

The formula to find the speed of an AC squirrel cage induction motor is 60×HertzPair of poles_.

Explanation of Solution

Discussion:

The squirrel cage induction motor’s speed depends on the frequency of the supply current and number of motor’s poles.

Write the expression to find the speed of an AC squirrel cage induction motor as follows:

RPM=60×HertzPair of poles (1)

Here

Hertz is the unit of frequency of supply current.

Rewrite the expression in Equation (1) in terms of number of poles of the motor as follows:

RPM=120×HertzNumber of poles

Conclusion:

Thus, the formula for finding the speed of an AC squirrel cage induction motor is 60×HertzPair of poles_.

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