GP Repair Theory of Operation
wc_tx000547gb.fm 69
5.3 Voltage Regulation
See Graphic: wc_gr003117
The Automatic Voltage Regulator (AVR) (c) is an encapsulated,
electronic control device that is rectangular in shape and located inside
the end cover of the generator. Its function is to maintain constant
generator voltage over varying load conditions. The AVR controls
generator voltage by sensing AC voltage from the main stator winding
via two sensing wires (e). Voltage induced through the excitation
winding of the stator is rectified to DC by the voltage regulator. The
resulting DC voltage is sent to the field terminals (brushes) (f). The DC
output controls the field strength of the excitation winding. Thus, as
more load is sensed, the more DC voltage is sent to the excitation
winding in the rotor via the brushes and slip rings (g). This voltage
increases the strength of the magnetic field of the rotor (b) which in
turn, allows more voltage to be induced in the stator (a) and used via
the receptacles.
wc_gr003117
a
g
c
e
d
f
b
DC
DC
AC
AC
AC
AC
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