Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 43, Problem 1RQ
To determine
The three methods of breaking a motor.
Expert Solution & Answer
Explanation of Solution
The electrical motor uses three types of braking the
Mechanical braking
In mechanical braking there are two type breaks drum and disc. In drum the pressure is applied to the metal cylinder called the drum by the help of break shoe. The drum is connected to the motor shaft. The pressure on the drum stops the motor from rotating. The disc rakes is most common braking, its working is similar to drum brake with difference that the brake pads exert the pressure on the spinning disc.
Dynamic braking
The dynamic braking is used to limit the dc motor and ac motor speed, in this method the motor supply is cut and rotating motor is connected across a load the power so produced is dissipated in the load thus stopping the motor.
Plugging
The plugging is the method used by the dc motor with the squirrel cage motor in this method. This is done by reversing the magnetic field in which the motor is operating. The reversing of the field reduces the speed and hence the motor.
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Chapter 43 Solutions
Industrial Motor Control
Ch. 43 - Prob. 1RQCh. 43 - How is the braking force of drum-type brakes...Ch. 43 - Why are mechanical brakes often used on cranes?Ch. 43 - What is the advantage of dynamic brakes over...Ch. 43 - What is the disadvantage of dynamic brakes when...Ch. 43 - The amount of countertorque developed by a...Ch. 43 - When using dynamic braking for a direct-current...Ch. 43 - Name three factors that determine the amount of...Ch. 43 - How is dynamic braking for direct-current motors...Ch. 43 - How is the dynamic braking force of an...
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