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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
90 Electric Motors and Drives
full load (i.e. when
the
current
is 20
A). From equation
3.8
we obtain
E
= 500 - 20 x =
480 volts.
We have already seen that
the e.m.f.
constant
is 480
volts/1000 rev/min,
so the
full load speed
is
clearly
1000
rev/min.
From no-load
to
full-load
the
speed falls linearly, giving
the torque-speed curve
for V = 500
volts shown
in
Figure
3.9. Note that from no-load
to
full-load
the
speed falls from
1040 rev/min
to 1000
rev/min,
a
drop
of
only
4 per
cent.
Over
the
same range
the
back
e.m.f.
falls from very nearly
500 volts
to
480 volts, which
of
course also represents
a
drop
of
4 per
cent.
Torque
(i)
125V
250 V 375
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Publisher Resources

ISBN: 9781483105277