Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 34, Problem 2RQ
To determine
Identify why high-impedance stator windings are used in induction motors intended to be controlled by variable voltage.
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For what purpose are synchronous motors used? Explain the V curves of the synchronous motor.
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Understanding Motor Controls
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- Why is it not a good idea to use circuit protection devices to protect large motors from overload conditions?arrow_forwardWhy can a multispeed fan motor be operated at lower speed than most induction motors without harm to the motor windings?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forward
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