ENGINE
A. STA R T E R
The magnet-switch type starter is composed of two
main section. The first section converts electrical
energy into mechanical rotaion to turn the engine
crankshaft. It is composed of the field coil, armature,
brush, commutator, pinion, overrunning clutch etc.
The second section allows the pinion and flywheel
to engage together and current to flow through the
motor section. It is composed of the pull-in coil,
holding coil, plunger, drive lever, contact plate, etc.
B. CHARGING SYSTEM
The charging system consist of an AC alternator and a regulator which is built in the alternator. The alternator
generates AC(Alternating Current) and the regulator converts AC into DC(Direct Current), also controls the
output voltage for charging current to the battery.
a) Alternator
The AC alternator produces higher voltage in slow speed, compared with DC dynamo and charge more
current to battery even during engine idling. The provided alternator is an alternating current generator
containing a rectifier, Alternating current is induced in stator coil by rotating magnetic pole around the coil. The
alternating current is then rectified into a direct current through diodes.
b) Regulator
The regulator regulates the charging voltage. Since the alternator speed is varied by engine speed variation,
the output voltage from alterantor varies. However, constant voltage(12V) must be supplied to the battery.
That is the regulator which works to keep the charging voltage at 12V.
Note :
• regulator of 13.8V to 14.8V must be used.
2.6 ELECTRICAL SYSTEM
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