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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 36, Problem 7SQ
Textbook Problem
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If frequency relays are used in starting, why is the starting cycle prolonged with an increase in motor load?

To determine

Explain why the starting cycle can persist for a long time with an increase in the motor load.

Explanation of Solution

Frequency relay use the principle of electrical resonance to operate. It is typically used as one type of compensating timer.

The rotor frequency of induction motor is expressed as follows:

fr=sfe (1)

Here,

s is the slip, and

fe is the frequency of induced voltage.

In equation (1), the supply frequency induced in the secondary rotor circuit is the maximum at zero speed and it will be the minimum at the high speed

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