Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 30, Problem 1RQ
Name three methods of braking a motor.
Expert Solution & Answer
To determine
Identify three methods of braking a motor.
Explanation of Solution
The motors are generally slowed to stop by disconnecting thee power supplied. But, there are instances where that is not convenient. In these instances, brakes are applied to the motor to slow or stop the motor.
Some of the methods of braking a motor are:
- Mechanical brakes.
- Dynamic brakes.
- Plugging.
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The cable exerts a force of P = 4 kN at the end of the 8-m-long crane boom.
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If 0 = 30°, determine the placement x of the boom at B so that this force creates a maximum moment about point O.
Express your answer to three significant figures and include the appropriate units.
x = 9.81 m
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▾ Part B
What is this moment?
Express your answer to three significant figures and include the appropriate units. Assume the positive direction is
counterclockwise.
(Mo) max 43.7
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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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