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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
132 Electric Motors and Drives
DEVELOPMENTS IN INDUSTRIAL D.C. DRIVES
Some drives now feature digital speed feedback, in which a
pulse train generated from a shaft-mounted encoder is
compared (using a phase-locked-loop) with a reference pulse
train whose frequency corresponds to the desired speed. The
reference frequency can easily be made accurate and drift-
free;
and noise in the encoder signal is easily rejected, so that
very precise speed holding can be guaranteed. This is especi-
ally important when a number of independent motors must
all be driven at identical speed. Phase-locked loops are also
used in the firing-pulse synchronizing circuits ...
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Publisher Resources

ISBN: 9781483105277