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ENGINE, GENERATOR ARMATURE
AND FRAME, ALTERNATOR
STATOR AND ROTOR
EXCITATION (FLASHING)
When the engine is started and running, the residual
magnetism voltage is applied to the alternator rotor via
a brush and slip ring configuration. This excitation
(“flashing”) voltage magnetizes the rotor lamination.
The alternator rotor is connected to the armature shaft,
which is mechanically coupled to the engine. The rotat-
ing magnet (rotor) induces a voltage in the stationary
windings of the alternator stator.
AUXILIARY AND FIELD FEEDBACK COILS
There are two isolated windings incorporated in the sta-
tor lamination assembly. One of these windings is
tapped and provides 115VAC and 230VAC of auxiliary
power to the appropriate receptacles. The other
115VAC isolated winding is rectified to a DC voltage
and is used to supply field feedback voltage to the
rotor. It also supplies voltage, through the generator
field rheostat control, to the field shunt windings in the
main generator frame.
INTERPOLE AND SERIES COILS
The generator armature rotates within the magnetic
field created by the shunt field windings. A DC voltage
is induced in the armature and is transferred, through
the armature commutator and brushes, to the series
and interpole coils. The interpole coils, which are con-
nected in series with the positive output terminal, are
located so as to counteract any magnetic influences
that could cause mechanical distortion in the rotating
armature. The series coils are designed to oppose or
“buck” the DC voltage that is generated in the arma-
ture.
THEORY OF OPERATION
E-3 E-3
CLASSIC II
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.3 – ENGINE, GENERATOR ARMATURE AND FRAME, ALTERNATOR STATOR AND ROTOR
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
115 & 230VAC
RECEPTACLES
CURRENT
TRANSFORMER
FIELD
RECTIFIER
FLASHING
RESIDUAL
MAGNETISM
ALTERNATOR STATOR
ROTOR
SLIP
RINGS
ARMATURE
SHAFT
GENERATOR
ARMATURE
BRUSHES
&
COMMUTATOR
GENERATOR
FRAME
SERIES
COILS
INTERPOLE
COILS
SHUNT
WINDINGS
GENERATOR
FIELD CONTROL
FIELD
MECHANICAL
COUPLING
REED
RELAY
CR2
SELECTOR
SWITCH
IDLER
BOARD
IDLER
SOLENOID
OIL
PRESSURE
SENSOR
OIL
TEMPERATURE
SENSOR
FUEL
SOLENOID
RELAY
CR1
ENGINE
ALTERNATOR
STARTER
MOTOR
BATTERY
ENGINE
PROTECTION
RELAY
IGNITION
SWITCH
ON LATER MODELS
PROTECTION AND IDLER CIRCUITS
ARE ON ONE PC BOARD
(NOT PRESENT
ON LATER MODELS)