Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 30, Problem 10RQ
How is the dynamic braking force of an alternating current motor controlled?
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Chapter 30 Solutions
Understanding Motor Controls
Ch. 30 - Name three methods of braking a motor.Ch. 30 - How is the braking force of drum type brakes...Ch. 30 - Why are mechanical brakes often used on cranes?
Ch. 30 - What is the advantage of dynamic brakes over...Ch. 30 - What is the disadvantage of dynamic brakes when...Ch. 30 - The amount of counter torque developed by a direct...Ch. 30 - When using dynamic braking for a direct current...Ch. 30 - Name three factors that determine the amount of...Ch. 30 - How is dynamic braking for direct current motors...Ch. 30 - How is the dynamic braking force of an alternating...
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- When using dynamic braking for a direct current motor, how is the braking time controlled?arrow_forwardHow is dynamic braking for direct current motors accomplished?arrow_forwardWhy is it not a good idea to use circuit protection devices to protect large motors from overload conditions?arrow_forward
- Which of the following is used as comparison element in speed control of motor shaft process.? a. Potentiometer b. Tachogenerator c. Motor shaft d. Differential Amplifierarrow_forwardName three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forwardIn the United States, the frequency in cycles per second (cps) at which an AC electric motor operates under normal conditions is A. 50. B. 60. C. 120. D. 208.arrow_forward
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