PMG, DPE Winding, Auxiliary Winding, and
Harmonic/Resonant Winding Use
The XR8 Universal Voltage Regulator is compatible with some of these types of generators but
not others. It is necessary to determine which type of generator you have before proceeding
since some styles will connect differently than others while the XR8 cannot be used with some
of these generators at all.
PMG (Permanent Magnet Generator/Exciter):
This type of generator generally has a permanent magnet generator mounted on the main shaft along
with a brushless exciter and finally the main rotor itself. The XR8 is a very fast responding regulator
(1/2 cycle response time) and low enough burden on the main stator that it can be used on these
generators without any need for the PMG input.
To connect the XR8 to this type of generator, isolate and insulate the PMG leads that were connected
to the original voltage regulator. Measure your field resistance and proceed with sizing on Page 4.
DPE Winding and Auxiliary Winding:
These generators use an extra winding in the main stator as a power supply for the voltage regulator
in an attempt to give the regulator a clean power source that isn’t affected by load. The XR8 has
proprietary filtering circuitry in its sensing stage that is largely unaffected by generator load. Because
the regulator isn’t affected by loading, these types of windings are not needed.
To connect the XR8 to this type of generator identify, isolate, and insulate the Auxiliary or DPE wiring
that were connected to the original voltage regulator. Measure your field resistance and proceed with
sizing on Page 4.
Harmonic and Resonant Windings:
This type of generator rarely has a voltage regulator, and instead relies on a phase-shifted “harmonic”
winding and a capacitor to adjust the terminal voltage with load. They often have a brushless
“exciter”, but because they operate on harmonics from the AC waveform, they do not operate like a
typical brushless exciter.
Because these generators rely on AC waveform
phasing for their voltage regulation, the XR8
cannot be used with this type of generator.
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