D439E Service Manual 3. Engine Electrical System (D439E)
131
Charging System
Description
Alternator
Alternator is of a built-In type with an IC regulator. A
brush holder is installed in the rear bracket.
When IC regulator falls, regulator assembly should
be replaced because the voltage cannot be
controlled.
Rotor
When the rotor is driven by the rotation of the pulley,
the current flows from the brush to rotor coil through
slip ring. Then, rotor core becomes an electro-
magnetic.
Stator
Stator core forms the magnetic flux path together
with rotor core. The magnetic flux in the stator core
is affected by the passage of the rotor core field so
that electricity is generated as each rotor core
rotates.
Commutator
Commutator comprises of 3 pails of diodes (6 in
total) and 2 heat sinks. It converts AC output of the
stator to DC power.
Regulator
Regulator assembly comprises of IC regulator,
brush and brush spring. It stabilizes the output
varying according to the engine rpm.
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