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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 46, Problem 6SQ
Textbook Problem
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How do individual timers, which have only light, single-pole control contacts, control the acceleration steps of a large DC motor?

To determine

Explain the controlling process of acceleration steps of a large DC motor by individual timers that have only light, single-pole control contacts.

Explanation of Solution

A timing relay can provide a definite time interval that is used to control the acceleration of the DC motor when it is being brought up to a speed. Using the inserted resistors in the line ahead of the DC motor, the acceleration of the motor can be controlled.

A definite time interval is provided by a timing relay contacts, it means that the resistors remain in the line for a fixed time period before the DC motor is connected across the line...

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