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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 40, Problem 4SQ
Textbook Problem
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When the rotor and stator fields lock into step, why may the reading of the AC ammeter decrease?

To determine

Explain why the AC ammeter reading will decrease when the rotor and stator fields lock into step.

Explanation of Solution

Refer to Figure 40-1 in the textbook, which shows the arrangement of DC ammeter and rheostat, when the rotor and stator fields lock into step and the rheostat is adjusted, the full load current to the motor will change with respect to the rated field current as shown in Figure 40-2 in the textbook. The full load current reads in ammeter minimum at the unity power factor...

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