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Electrical Applications 2 by David W. Tyler

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DC machines
99
THE
DC
GENERATOR
shows
the
instant just before
the
complete wave
is
used,
f
3
. The
average voltage
is
now much higher. Generally
a
full-wave rectifier
giving twice
the
number
of
pulses
or a
three-phase bridge rectifier
giving six times the number
of
pulses illustrated will be used.
Shunt-wound
V I--L-L
Figure
6.42
If a d.c. machine connected
to a
supply and running as a motor,
has
the speed
of
its armature raised above that
at
which
it
operates as
a
motor
by
driving
it
with