1 Description
1.1 Separately-Excited AVR Controlled Alternators
1.1.1 Permanent Magnet Generator (PMG) excited - AVR
controlled alternators
WARNING
Strong Magnetic Field
The strong magnetic field from a permanent magnet generator (PMG) can cause serious
injury or death by interference with implanted medical devices.
To prevent injury, do not work near a PMG if you have an implanted medical device.
The AVR provides closed loop control by sensing the alternator output voltage at the main
stator windings and adjusting the exciter stator field strength. Voltage induced in the exciter
rotor, rectified by the rotating diodes, magnetises the rotating main field which induces
voltage in the main stator windings. A separately-excited AVR is independently powered
from a separate permanent magnet generator (PMG), mounted on the main alternator rotor
shaft. Voltage is induced in the stator of the PMG by a rotor of permanent magnets.
No. Description No. Description No. Description
1 Main field (rotor) 5 PMG armature (stator) 9 Main armature (stator)
2 Rotating diodes 6 Exciter field (stator) 10 Output
3 Exciter armature (rotor) 7 AVR 11 Rotor shaft
4 PMG field (rotor) 8 Isolating transformer (if
fitted)
A043Y699 (Issue 2) 1
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