If there is a locked rotor in the secondary circuit, what will be the value of the frequency?

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

Chapter
Section

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 36, Problem 8SQ
Textbook Problem
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If there is a locked rotor in the secondary circuit, what will be the value of the frequency?

To determine

Find the value of the frequency, when there is a locked rotor in the secondary circuit.

Explanation of Solution

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.

The slip of an induction motor is expressed as follows:

Slip, s=NsNrNs (2)

Here

Ns is the synchronous speed, and

Nr is the rotor speed.

When a wound rotor motor is locked, it means that the rotor does not rotate. If the rotor does not rotate, the speed of a motor (Nr) is zero

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