Generac Power Systems Quietpact 75 - Manual (Page 10)

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M MA AJ JO OR R G GE EN NE ER RA AT TO OR R C CO OM MP PO ON NE EN NT TS S
ROTOR ASSEMBLY
The Rotor is sometimes called the “revolving field”,
since it provides the magnetic field that induces a
voltage into the stationary Stator windings. Slip rings
on the Rotor shaft allow excitation current from the
voltage regulator to be delivered to the Rotor wind-
ings. The Rotor is driven by the engine at a constant
speed through a pulley and belt arrangement.
All generator models in this manual utilize a 2-pole
Rotor, i.e., one having a single north and a single
south pole. This type of Rotor must be driven at 3600
rpm for a 60 Hertz AC output, or at 3000 rpm for a 50
Hertz output.
Slip rings may be cleaned. If dull or tarnished, clean
them with fine sandpaper (a 400 grit wet sandpaper is
recommended). DO NOT USE ANY METALLIC GRIT
OR ABRASIVE TO CLEAN SLIP RINGS.
STATOR ASSEMBLY
The Stator is “sandwiched” between the upper and
lower bearing carriers and retained in that position by
four Stator studs. Windings Included in the Stator
assembly are (a) dual AC power windings, (b) an
excitation or DPE winding, and (c) a battery charge
winding. A total of eleven (11) leads are brought out
of the Stator as follows:
1. Four (4) Stator power winding output leads (Wires No. 11P,
22P, 33 and 44). These leads deliver power to connected elec-
trical loads.
2. Stator Power winding “sensing” leads (11S and 22S). These
leads deliver an “actual voltage signal to the electronic Voltage
Regulator.
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Figure 2-1. Exploded View of Generator