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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 15SQ
Textbook Problem
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A synchronous motor can be used to increase the power factor of an electrical system by

  1. a. reducing the speed.
  2. b. overexciting the stator field.
  3. c. operating at unity power factor.
  4. d. applying DC to the stator field.

To determine

Choose the correct option to find how the synchronous motor can be used to increase the power factor of an electrical system.

Explanation of Solution

The synchronous motor is used to provide correction of the power factor. This type of motor is mainly designed to operate at unity power factor or 0.8 leading power factor. By increasing the DC excitation voltage, which is done by increasing the field current, the power factor of the motor can be varied widely. The main advantage of the motor is that it is used to increase the power factor. The motors that are overexcited can be operated at leading power factor and can be used to provide the reactive kVAR such as capacitors.

The highest power factor that is the unity power factor is obtained in synchronous motor

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