TM 5-6115-584-12
NAVFAC P-8-622-12
Section XIV. MAINTENANCE OF GENERATOR ASSEMBLY
TO-35C2-3-456-1
TM-05682C-12
4-53. DESCRIPTION AND FUNCTION.
semi-conductor “diodes mounted on two heat sinks, a
voltage regulator and current-voltage transformers.
The generator (main alternator) (see figure l-l) is
The exciter armature and the bridge rectifier assem-
a single bearing, splashproof, self -ventilated unit, with
bly are mounted on the rotor shaft of the synchronous
a flange to attach to the engine flywheel housing.
Major generator components are stator, rotor, and
generator and are connected to the generator field
windings.
The stator of the brushless exciter con-
brushless exciter. The stator is composed of a com-
sists of field coils wound on the poles and attached
pressed stack of one piece laminations held in posi-
to the generator endbell. During operation of the
tion by stator bars welded axially on the outside
generator, the three-phase power generated in the
diameter of the laminations. A steel wrapper welded
rotating exciter armature is applied directly to the
to these bars provides the generator frame. The
rotating rectifier assembly. The six diodes, mounted
generator windings each occupy two groups of slots
on rotating heat sinks, are connected to forma three-
180 mechanical degrees apart. The generator rotor is
phase, full-wave bridge. The direct current output of
composed of one piece rotor laminations, stacked,
the bridge rectifier is applied to the rotating field
compressed, and held in position by copper damper
of the generator. Thus, the two assemblies; exciter
bars welded to the copper end laminations. Rotor
armature and synchronous field form a single rotating
windings are made of Type L2 Class 155 copper wire
assembly, enabling electrical connections to be made
insulated from ground with MIL-I-22834A synthetic
without the use of brushes, collector rings or com-
bonded paper. The rotor is press fitted and keyed to
mutator. Excitation current for the stationary field
the rotor shaft, and balanced. The brushless ro-
coils of the excitation unit is supplied by the synchron-
tating exciter with rotating rectifier unit is used for
ous generator, and controlled through the static type
providing excitation current to the rotating field of the
automatic voltage regulator. The voltage regulator
generator. The complete excitation unit consists of
continuously compares the output voltage of the
four basic component assemblies: a three-phase ro-
tating armature,
synchronous generator with a stable reference volt-
alternating current generator; a
age. The difference between the two voltages con-
three-phase full-wave bridge rectifier composed of six
stitutes an error signal which indicates an output
4-56
Figure 4-45. Generator Screen-Guard
