Generator - Hobart 100D20 Operation And Maintenance Manual With Illustrated Parts List

OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
1. Exhaust pipe
d. Generator
The 400-Hz generator is a brushless, revolving field, three-phase, alternating current type. The
rotor assembly is mounted by two, permanently lubricated, sealed ball bearings. The front bearing
is supported by the fan housing; the rear bearing is mounted in the exciter housing and both of
these are attached to the main generator stator housing. The front end of the rotor shaft extends
forward beyond the bearing and is attached to the engine flywheel by a hub and flexible disc
coupling assembly. The rear end of the rotor shaft extends rearward beyond the rear bearing into
the exciter stator housing. The exciter rotor is mounted on the shaft extention with a standard key
and is secured by a washer and 1/2" -13 thd., cap screw.
A rectifier with six diodes is mounted on the exciter rotor and converts exciter AC output to DC for
excitation of the generator revolving fields. The exciter DC output to the generator fields, and
consequently, the generator output is controlled by the amount of DC voltage supplied to exciter
fields by the static voltage regulator. A centrifugal, radial-blade fan, which is part of the hub and
coupling assembly, draws cooling air over all internal windings. Air enters at the exciter end and is
discharged at the drive end. The complete generator is bolted to the engine flywheel housing.
March 31/94 Revised
2. Muffler assembly
Noise Reduction Exhaust System
Figure 6
3. Manifold pipe
Chapter 1-1
Page 9