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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 49, Problem 8SQ
Textbook Problem
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What may cause a de-energized brake to slip under load with maximum spring tension?

To determine

Explain the reason that may cause a de-energized brake to slip under load with maximum spring tension.

Explanation of Solution

Discussion:

An electric brake consists of two friction surfaces, or shoes that can be made to bear on a wheel on the motor shaft. The shoe on the wheel is held by the spring tension. Due to the friction between the shoes and wheel, the braking is achieved.

Generally, the brakes are sized in a range of 1 inch to 30 inches. Brakes with larger diameters are provided with protective resistor and a relay to allow the operation at a high speed...

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