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5-2-2
ROTOR
The
rotor consists of
a
laminated silicon
steel
sheet
core
and
a
field
coil which
is
wound over
the
core.
DC
current
in
the
field
coil magnetizes
the
steel
sheet
core.
Two
permanent magnets are provided
for
the
primary exciting action.
Slip
rings
are
provided
on the rotor shaft to
re-
ceive
DC
exciting current from
A.V.R..
5-2-3
BRUSW
BRUSH
HOLDER
An
exciting current
is
supplied
from
the
A.V.R
to
the rotor. The brushes are made
of
carbon and
the
brush-holder of plastic.
It
is
necessary to
keep
the
contact
pressure
be-
tween
the brushes
and
slip
rings
withing
specific
limits.
Thus,
care
must
be taken of
brush
length.
Fig.
5-3
5-2-4
A.V.R. (AUTOMATIC VOLTAGE REGULATOR)
The
automatic voltage regulator employs an elec-
tronic circuit
to
automatically regulate voltage.
Fig.
5-5
~
Fig.
5-4
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a-