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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 39, Problem 1SQ
Textbook Problem
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Why is it necessary that the rotor and stator have an equal number of poles?

To determine

Explain the reason why both rotor and stator should possess equal number of poles.

Answer to Problem 1SQ

The reason why both rotor and stator should possess equal number of poles is to synchronize with each other.

Explanation of Solution

An independent field is established around the rotor, which is energized by a direct current through slip rings mounted on the shaft. The rotor has the same number of coils as the stator, so that each and every rotor pole (north and south) can have an alternative stator poles (north and south), and synchronize with each other. Therefore, the motor’s stator and rotor are in relative speed due to magnetism.

Conclusion:

Thus, the reason why both rotor and stator should possess equal number of poles is to synchronize each other.

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