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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
40 Electric Motors and Drives
VOLTAGE CONTROL - D.C OUTPUT FROM D.C.
SUPPLY
For the sake of simplicity we will begin with the problem of
controlling the voltage across a resistive load, fed from a
battery. Three different methods are shown in Figure 2.2. The
battery voltage is assumed to be constant at 12 V, and we
seek to vary the load voltage from 0 to 12 V. Although this is
not quite the same as if the load was a d.c. motor the con-
clusions which we draw are effectively the same.
Method (a) uses a variable resistor (R) to absorb whatever
fraction of the battery voltage is not required at the load. It
provides smooth control, but the sna
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Publisher Resources

ISBN: 9781483105277