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8
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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 BRUSH/ 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.
5-2-4
A.V.R. (AUTOMATIC VOLTAGE REGULATOR)
The automatic voltage regulator employs an elec-
tronic circuit to automatically regulate voltage.
Fig. 5-3
Fig. 5-4
Fig. 5-5
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