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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
Conventional
d.c.
Motors
93
The maximum allowable speed under weak field con-
ditions must
be
limited
(to
avoid excessive sparking
at the
commutator),
and is
usually indicated
on the
motor rating
plate.
A
marking
of
1200/1750 rev/min,
for
example, would
indicate
a
base speed
of
1200 rev/min,
and a
maximum speed
with field weakening
of
1750 rev/min.
The
field weakening
range varies widely depending
on the
motor design,
but
maximum speed rarely exceeds three
or
four times base
speed.
To
sum up, the
speed
is
controlled
as
follows:
Below base speed,
the
flux
is
maximum,
and the
speed
is
set
by the
armature voltage. Full torque
is
available
a
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Publisher Resources

ISBN: 9781483105277