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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 3, Problem 17SQ
Textbook Problem
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Select the best answer for each of the following.

An AC magnet may hum excessively due to

a. improper alignment.

b. foreign matter between contact surfaces.

c. loose laminations.

d. all of the above.

To determine

Choose the correct option that represents the causes of the excessive hum in an AC magnet.

Explanation of Solution

Discussion:

The following are the causes for the excessive hum (noise) in an AC magnet.

  • Improper alignment of the magnet.
  • Loose laminations of the magnet.
  • Foreign matter between the contact surfaces...

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