Wacker Neuson G2.5A, Repair Manual

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Portable Generator Repair G 3.7A;G/GS 5.6A;GS 8.5V;GS 9.7V
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6.2 Rotor
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The inside of the rotor shaft is tapered and connected directly to the
taper on the engine crankshaft. This end is supported by the engine
crankshaft bearing. The opposite end of the rotor is supported by a
bearing housed in the generator housing. This end also contains the
two slip rings. There are two individual coils wound on the rotor (a).
When the engine is running, these two windings create the magnetic
field for the main stator windings.
6.3 Stator
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The stator (b) houses both the main windings and auxiliary winding.
The main windings are connected directly to the main circuit breaker
and voltage selector switch to supply power to the output receptacles.
The auxiliary winding induces the initial current in the field windings of
the rotor. It is connected directly to the choke and the AC input to the
bridge rectifier.
6.4 Automatic Voltage Regulator
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The Automatic Voltage Regulator (AVR) (c) provides the generator
with a means of maintaining a specific voltage regardless of load. The
AVR accomplishes this by regulating DC current from the auxiliary
winding. When the load on the generator increases, the AVR allows
additional DC current into the rotor. The additional DC voltage allows
the generator to increase output and maintain volta
6.5 Choke
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The purpose of the choke (d) is to bring the auxiliary winding “in phase”
with the main windings.