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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
105
the motor
is
said
to be
'differentially compounded'.
In
this
case
an
increase
in
current results
in a
weakening
of
the flux,
a reduction
in the
torque
per
ampere,
but a
smaller drop
in
speed than
in a
simple shunt motor. Differential com-
pounding
can
therefore
be
used where
it is
important
to
maintain
as
near constant-speed
as
possible.
FOUR QUADRANT OPERATION
AND
REGENERATIVE BRAKING
One
of
the great beauties
of
the separately-excited d.c. motor
is
the
ease with which
the
torque
can be
controlled.
The
torque
is
directly proportional
to the
armature current,
which
in
turn depends
on the
difference between
the
applie ...
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Publisher Resources

ISBN: 9781483105277