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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
26 Electric Motors
and
Drives
The motional
e.m.f. in
Figure
1.12 is
shown
as
opposing
the applied voltage, which applies
in the
'motoring' con-
dition
we
have been discussing. Applying KirchofFs
law we
obtain
the
voltage equation
as
V
= E + IR or I =
V
~
E
.
(1.18)
Multiplying equation
1.18 by the
current gives
the
power
equation
as
Electrical Input Power
(VI) =
Mechanical Output Power (EI)
+
Copper Loss (PR). (1.19)
It
is
worth seeing what
can be
learned from these equations
because,
as
noted earlier, this simple set-up encapsulates
all
the essential features
of
real motors. Lessons which emerge
at this stage will
be
invaluable later, when
w ...
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Publisher Resources

ISBN: 9781483105277