Section 1 Description And Components; Introduction; Engine-Generator Drive System; The Ac Generator - Generac Power Systems GP Series Diagnostic And Repair Manual

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

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
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.
Diagnostic Repair Manual
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
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.

The AC Generator

Figure 1-1 shows major components of the AC
generator.
C
E

Stator Assembly

The stator can houses the dual AC power windings, an
excitation winding, and two battery charge windings.
See Figure 1-2. A total of thirteen (13) stator leads
extend from the stator can.
NOTE: On older style generators the sense leads are
11S and 44S. On newer style generators the sense leads
are 11S and 22S.
The stator can is positioned between an engine adapter
and a rear bearing carrier. It is retained in position by four
stator studs.
crankshaft engine. The
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