9. Generator
9-1
GENERATOR DESCRIPTION
The KY genset uses a 2-pole, revolving field, gener-
ator design. Output voltage is controlled by an elec-
tronic voltage regulator. A circuit breaker provides
overcurrent protection for the generator and also
functions as an on/off switch in the load circuit. AC
load connections are made through generator lead
wires that connect directly to a customer supplied
junction box.
The generator section consists of the following
components and controls:
• Stator and housing
• Rotor
• Brushes
• Electronic Voltage Regulator (VR1)
• Circuit Breaker (CB1)
• Wiring Harness
Stator and Housing
The stator consists of steel laminations stacked to-
gether, with three separate windings wound into
slots in the laminations. Winding T1-T2 is the main
power winding that provides the voltage and current
to operate the connected loads. Winding B1-B2 is
for battery charging and internal low voltage loads.
Winding Q1-Q2 is an excitation winding that pro-
vides power to the voltage regulator for the rotor
field winding. The stator assembly mounts inside
the stator housing. Refer to Figure 9-1 on Page
9-3.
Rotor
The rotor consists of steel laminations stacked to-
gether on a shaft. A field winding is wrapped around
the laminations. The rotor shaft also has molded
slip rings and a pressed on bearing. The entire as-
sembly is connected directly to the tapered engine
crankshaft by means of a through bolt. The rotor is
supported by the engine bearing and by the endbell.
The rotor field winding provides the rotating mag-
netic field which in turn generates the voltage in the
stator windings to power the connected loads. The
magnetic field is established by a DC current flow-
ing from the brushes through the slip rings and the
field winding.
Generator Cooling
Cooling air for the generator is provided by a centrif-
ugal fan mounted on the rotor shaft next to the bear-
ing. A portion of the airflow from the fan is directed
into the generator. Airflow through the generator
cools the rotor and stator windings.
Brushes and Brush Block
The brush block is a one piece molded part that
mounts on the endbell. There are two carbon
brushes in the brush block that make contact with
the slip rings on the rotor. The brushes provide the
path for the controlled DC current from the regulator
to the rotor field winding. Each brush is kept in con-
tact with a slip ring by a spring located inside the
brush block, behind the brush. The spring exerts the
right amount of pressure to provide good contact
and long brush life.
Electronic Voltage Regulator (VR1)
The electronic voltage regulator controls the output
of the generator so the voltage remains constant
under any load condition. The electronic voltage
regulator takes power from the stator excitation
winding, rectifies it, and feeds it into the field winding
through the brushes and slip rings. The regulator
continually measures the output of the power wind-
ing and regulates how much current should be fed
into the field winding to maintain the proper output
at various load levels.
Circuit Breaker (CB1)
AC output from the generator is supplied to a circuit
breaker located along side the control panel. The
circuit breaker protects the generator windings from
an overload or short circuit.
Wiring Harness
A wiring harness is provided for connecting the gen-
set to the RV electrical system. All lead wires are
stranded copper wire to withstand vibration. The
lead wires must be protected with flexible conduit
that must be provided by the RV manufacturer or
genset installer. A 1/2-inch conduit elbow is pro-
vided to facilitate installation. The load wire conduc-
tor is black, the neutral conductor is white, and the
ground conductor is green.
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