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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 33, Problem 1SQ
Textbook Problem
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When a four-speed, two-winding motor is running, why is it desirable to allow the idle winding to remain open circuited?

To determine

Explain the reason for the idle winding to remain open circuited in the running condition of a four speed, two winding motor.

Explanation of Solution

Refer to Figure 33-2 in the Textbook, which illustrates the common motor connections of the four-speed, two winding motors with different speeds.

The idle winding of the motor remains to be open circuited in running state on given speeds. Through open circuiting, energizing windings can be prevented from imposing of unnecessary electrical loads. These loads can result from the transformer action which produces the circulating currents in the secondary, idle winding.

Conclusion:

Thus, the reason for the idle winding to remain open circuited in the running condition of a four speed, two winding motor is explained.

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