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 TM 55-1905-220-14-5
3-63. GENERATOR. (40 KW)-MAINTENANCE INSTRUCTIONS
a. The generator is an alternating current (AC) brushless type. The generator produces 450/VAC, 3 phase,
60 hertz, 40 kilowatts at 1800 revolutions per minute (RPM).
b. The generator consists of two major components: The alternator, and a direct-connected exciter.
c. The alternator is made up of a rotating coil assembly, or rotor, and a fixed stator-coil assembly, or
stator. The rotor consists of four coil and pole piece assemblies bolted to a shaft. These coils are connected in
series with leads brought out to the rotating rectifier assembly. The stator consists of coil groups placed in slots
in a laminated steel cove. The stator and coils are mounted in the frame. The rotating rotor is energized by
exciter armature. The output of the exciter armature is converted to direct current (DC) by the rotating rectifier
assembly.
d. The rotating rectifier assembly and the exciter armature are mounted on the shaft. The exciter
armature rotates inside the exciter field assembly. The exciter field assembly consists of twelve coils
connected in series and is attached to the frame. The exciter armature is of the twelve pole type. It is
connected in a three-phase, three wire, wye coil group. These groups are mounted on the shaft. The output of
the armature is rectified by the rotating rectifier assembly.
e. The rotating rectifier assembly is a bridge rectifier with surge protection and control components.
3-1110
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