Generac Power Systems 75, 55 Section MAJOR GENERATOR COMPONENTS, Rotor Assembly, Stator Assembly

Section 2

MAJOR GENERATOR COMPONENTS

Figure 2-1. Exploded View of Generator

ROTOR ASSEMBLY STATOR 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.

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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