Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 39, Problem 11SQ
Textbook Problem

Varying the DC voltage to the rotor field changes the

  1. a. motor speed.
  2. b. power factor.
  3. c. phase excitation.
  4. d. slip.

To determine

Choose the correct option to find the factor that can change by varying the DC voltage of the rotor field.

Explanation of Solution

The synchronous motor is a three-phase AC motor that can be operated at constant speed from no-load condition to the full load. This motor includes a revolving field that is separately excited using DC source. Such an excitation process from the DC source is similar to the process followed in the three-phase AC generator.

If the excited DC field changes in the synchronous motor, the power factor can vary over a wide range of leading and lagging values. The armature current of the motor mainly corresponds to unity power factor...

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