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Electric Motors and Drives
book

Electric Motors and Drives

by Austin Hughes
October 2013
Beginner to intermediate content levelBeginner to intermediate
316 pages
13h 14m
English
Newnes
Content preview from Electric Motors and Drives
D.C. Motor Drives 123
CONTROL ARRANGEMENTS FOR D.C
DRIVES
The most common arrangement, which is used with only
minor variations over the whole size range from small servo-
type drives up to the largest industrial drives, is the so-called
two-loop control. This has an inner feedback loop to con-
trol the current (and hence torque) and an outer loop to
control speed. When position control is called for, a further
outer position loop is added.
A two-loop scheme for a thyristor d.c. drive is discussed
first, but the essential features are the same in a chopper-fed
drive. Later the simpler arrangements used in low-cost small
drives are discussed. ...
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Publisher Resources

ISBN: 9781483105277