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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 129
Armature voltage feedback and IR compensation
In low-power drives where precision speed-holding is not
essential, and cost must be kept to a minimum, the
tachogenerator is dispensed with and the armature voltage is
used as a 'speed feedback' instead. Performance is clearly not
as good as with tacho feedback, since whilst the steady-state
no-load speed is proportional to armature voltage, the speed
falls as the load (and hence armature currrent) increases.
We saw in Chapter 3 that the drop in speed with load was
attributable to the armature resistance volt-drop (IR), and
the drop in speed can therefore be compensated b
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Publisher Resources

ISBN: 9781483105277