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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 21, Problem 1SQ
Textbook Problem
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How is a change in the direction of rotation of a three-phase motor accomplished?

To determine

Explain how the change in the direction of rotation of a three-phase motor is accomplished.

Explanation of Solution

The rotational direction of a three-phase motor can be reversed by interchanging any two motor terminals in the line.

The reversal of direction of the motor is accomplished by the reversing the starters with the help of two contactors; one is used for the forward direction and another is used for the reverse direction.

Refer to Figure 21-3 in the textbook; the contactor represented as “F” is turned on for the forward direction of the motor. Also, the contactor represented as “R” is turned on for the reversal direction of the motor because lines L1 and L3 are interchanged.

Conclusion:

Thus, the process of changing the direction of three-phase motor is explained.

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