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Excitation System Functional Overview
Exciter field control is established by the strength of the exciter field
current developed by the voltage regulator system. The DC voltage
and current levels of the exciter field signal from the voltage regulator
varies depending upon the generator output voltage and the loading of
the output lines. See Figure 10.
Figure 10 Excitation System Overview
PMG System
The permanent magnet generator (PMG) system consists of the PMG
stator and PMG rotor.
PMG Stator
The PMG stator is a stationary armature and is located within the
stator assembly that also contains the exciter stator or is a separate
stator mounted next to the exciter stator. The PMG stator consists
of steel laminations. The laminations are held in place by steel
compression rings and are welded to the frame bars of the exciter-
PMG frame. The PMG windings are placed in slots in the laminations.
Insulating wedges are inserted at the top of each slot to hold the coils
in position.
PMG Rotor
The PMG rotor consists of rectangular permanent magnets and cast
pole tips secured to a steel hub with nonmagnetic stainless steel bolts.
The PMG rotor is keyed to the shaft and secured with a nut and lock
washer.
Prime
Mover
Rotor
(DC)
Stator
(Armature)
Output Leads
Shaft
Rectifier
Armature
(AC)
Voltage
Regulator
Stator
(Field)
Power
Input
Stator
(Armature)
Rotor
(Field)
PMG
EXCITER
MAIN
Summary of Contents for 4P10
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