Generac Power Systems IM Series - Manual (Page 5)

Generator Block Diagran^
E
The Rotor (spinning fieid) is driven by the engine,
through a belt and pulley arrangement to maintain a fixed
operating speed. The Rotor’s magnetic field cuts across,
(a) a Stator a-c power winding, (b) a Stator excitation
winding, and (c) a Stator battery charge winding, to
induce a voltage Into those windings.
1. Stator Battery Charge Winding: Rectified direct
current output from this winding is delivered to the gen­
erator’s 12-volts battery, to maintain battery state-of-
charge.
2. Stator a-c Power Winding:- The a-c output from this
winding is used to supply electrical power to connected
electrical loads.
3. Excitation Winding:- Output from this winding is
delivered to an Electronic Voltage Regulator, where it is
rectified and, based on a-c power winding sensing sig­
nals, regulated. The regulated, rectified current flows
through the brushes and slip rings and into the Rotor
windings. Because the current flow is regulated, the
Rotor’s magnetic field strength Is regulated. In turn, be­
cause the field strength is regulated, the voltage induced
into the Stator windings is regulated.
12 VOLTS
BATTERY
1
Stator
Excitation
Winding
Customer
Load
Connections
Stator a-c
Power
Winding
BATTERY
CHARGE
DIODE
Stator a-c
Power
Winding
-r
Magnetic Field
8
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Slip Rings \
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