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Excitation System
The excitation system consists of the exciter stator assembly and the
exciter armature assembly. See Figure 9.
The exciter stator assembly consists of windings in a core. The core
is made from steel laminations that are stacked and welded together.
The main exciter stator coils are placed in slots in the core and form
alternate north and south poles. The entire assembly is either mounted
to the end bracket or mounted in a frame, which is mounted to the
end bracket. The stator is a stationary field, which is powered by the
voltage regulator.
Figure 9 Excitation System
The assembly consists of two subassemblies: the exciter armature
and the rotating rectifier. The exciter armature assembly contains
steel laminations that are stacked and keyed on the shaft or onto a
sleeve, which is keyed to the generator shaft. A three-phase winding
is inserted into slots in the laminations. The coils are held in place by
insulating wedges. The coil extensions are braced with tape. Output
leads from the winding are connected to the rotating rectifier assembly.
The rotating rectifier is a three-phase, full wave bridge rectifier,
converting the AC from the exciter armature to DC, which is
transferred to the revolving field windings. Two aluminum steel
plates, each containing three rotating rectifier diodes, are mounted
on each side of an insulating hub to form the negative and positive
terminals. The plates also act as heat sinks for the diodes.
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