Charging System; General Description; Alternator - Daewoo G424 Gasoline Service Manual

CHARGING SYSTEM

General Description

The alternator is an electrical and mechanical
components driven by a belt from engine rotation. It
is used to charge the storage battery during the
engine operation. The alternator is cooled by an
external fan mounted behind the pulley. The fan pulls
air through the holes in the back of the alternator.
The air exits the front of the alternator, cooling it in
the process. The Daewoo CS-121 series also has an
internal fan. This fan is mounted on the rotor. This
fan pulls air through the holes in the back of the
alternator to cool the rectifier bridge and regulator.
The air exits the front of the alternator.
The alternator converts mechanical and magnetic
energy to alternating current (AC) and voltage. This
process is done by rotating a direct current (DC)
electromagnetic field (rotor) inside a three phase
stator. The alternating current and voltage (generated
by the stator) are changed to direct current by a
three phase, full wave rectifier system using six
silicone rectifier diodes. Some alternators have three
exciter diodes or a diode trio. They rectify the current
needed to start the charging process. Direct current
flows to the alternator output terminal.
A solid state regulator is installed in or on the back of
the alternator. Two brushes conduct current, through
two slip rings, to the rotor field. Some alternators
have a capacitor mounted on them. The capacitor
protects the rectifier from high voltages. It also
suppresses electrical noise through a radio, if
equipped.
The alternator is connected to the battery through the
ignition switch for alternator turn on . Therefore,
alternator excitation occurs when the switch is turned
on.
G424 Service Manual
Alternators
The alternators used on these engines have three
phase, full-wave, rectified output. They are the brush
type. Refer to the Alternator Coverage chart for
detailed systems operation information
ALTERNATOR COVERAGE

Alternator

Part Number
D167411
D187478
IDES081P
Daewoo CS-121 Alternator
IDES082P
Mico K1 Enclosed Alternator
47
Manufacturer/
Series
Daewoo/CS-121
MICO/K1 Sealed
Charging System