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Electrical Applications 2 by David W. Tyler

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100 DC
machines
Series-wound This
is
rarely
if
ever used since with
no
load
on the
machine there
is
no current
in the
field winding
and the
output voltage
is
near zero.
When
a
current flows
a
flux
is
produced
and the
output voltage
rises.
The
terminal voltage
is
therefore
a
function
of the
load cur-
rent.
Compound-wound Cumulative compounding
is
used
to
overcome the drooping voltage
characteristic shown
in
Figure
6.43 for the
shunt machine.
As
load
current flows
in the
series winding
a
flu