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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
Electric Motors
33
The ideal situation
is
clearly
one
where
the
term
IR in
equation
1.18 is
negligible,
so
that
the
back
e.m.f. is
equal
to
the applied voltage.
We
would then have
an
ideal machine
with
an
efficiency
of 100 per
cent,
in
which
the
steady-state
speed would
be
directly proportional
to the
applied voltage
and independent
of the
load.
In practice
the
extent
to
which
we can
approach
the
ideal
situation discussed above depends
on the
size
of
the machine.
Tiny motors, such
as
those used
in
wrist watches,
are
awful,
in that most
of
the applied voltage
is
used
up in
overcoming
the resistance
of the
conductors,
and the
motional
e.m.f.
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Publisher Resources

ISBN: 9781483105277