Generac Power Systems GP Series Diagnostic Repair Manual page 7

Description and Components
Section 1
Introduction
The generator revolving field (rotor) is driven by an air-
cooled engine at 3600 rpm.
The generator may be used to supply electrical power
for the operation of 120 and, or 240 volts, single-phase,
60 Hz, AC loads.
A. Brush Holder Assembly
B. Rotor
C. Stator
D. Rear Bearing Carrier
E. Engine Adapter
F. Engine
A
The AC Generator
Figure 1-1 shows major components of the AC
generator.
Rotor Assembly
The 2-pole rotor must maintain 3600 rpm to supply a 60
Hertz AC frequency. The term "2-pole" means the rotor
has a single north magnetic pole and a single south
magnetic pole. As the rotor rotates, the lines of magnetic
flux cut across the stator assembly windings and a
Diagnostic Repair Manual
C
B
D
Figure 1-1. AC Generator Major Components
Engine-Generator Drive System
See Figure 1-1. The generator revolving field is driven
by an air-cooled, horizontal crankshaft engine. The
generator is directly coupled to the engine crankshaft.
Both the engine and generator rotor are driven at
approximately 3600 rpm, to provide a 60 Hz AC output.
voltage is induced into the stator windings. The rotor
shaft mounts a positive (+) and a negative (-) slip ring,
with the positive (+) slip ring nearest the rear bearing
carrier. The rotor bearing is pressed onto the end of the
rotor shaft. The tapered rotor shaft is mounted to a
tapered crankshaft and is held in place with a single
through bolt.
F
E
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