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Electric Motor Control

10th Edition
Herman
ISBN: 9781133702818

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BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
ISBN: 9781133702818
Textbook Problem

At what speed can a four-pole, 240-volt, 5-hp, 50-hertz motor operate?

To determine

Calculate the speed in rpm for a four pole 240V, 5hp, and a 50hertz squirrel cage induction motor.

Explanation

Given data:

The number of poles (n) is 4.

The frequency (f) is 60Hz.

The line voltage (E) is 240V.

Formula Used:

The total number of poles in the motor is 4. Therefore, the number of pairs of poles of the motor is 2.

Write the expression to calculate the speed in rpm of a squirrel cage induction motor as follows:

Speedinrpm=60×HertzPairsof

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