8-1
8. Generator
OVERVIEW
These are 2-bearing, belt-driven, 2-pole revolving-
field generators with brushes and slip rings (Fig-
ure 8-1). Output voltage is regulated by microcon-
troller-based genset controller (Page 9-1).
Stator
The stator consists of steel laminations with three
sets of windings in the lamination slots. The main
windings (T1–T2, T3–T4) are for powering the con-
nected loads, the quadrature winding (Q1–Q2) is for
field excitation and the (B1–B2) winding for battery
charging.
Rotor
The rotor consists of a shaft with steel laminations
wrapped with field windings. A molded slip ring as-
sembly is pressed on to supply field current to the
rotor windings through the brush block assembly.
The rotor shaft is supported on both ends by sealed
ball bearings. The drive belt pulley and fan are cen-
ter-bolted to the tapered rotor ends.
Brush Block
Field current passes through the brush block which
has two spring-loaded carbon brushes that make
contact with the rotor slip rings.
Principle of Operation
During startup genset controller A1 flashes the field
with battery current for fast buildup of generator volt-
age as the engine accelerates to operating speed.
During operation, the controller maintains nominal
AC output voltage by varying field current in re-
sponse to load. In response to transient loads, the
controller lowers the voltage setpoint to allow for en-
gine recovery.
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