On Sunday, October 6, 2019 at 11:07:35 PM UTC-4, Ralph Mowery wrote:
In article ,
says...

No way to find the voltage sensing circuit that controls the voltage.
There must be a circuit that drives the current to the rotor.
See what it's doing, maybe put a resistor in series to trick it out?
Probably no schematics that show what the board or boards do though.




Most of the simple generators only have a governed speed control. There
is usually a mechanical adjustment for this somewhere in the 'fixed
throttle'.

That's one way of trying to change the voltage, but I doubt it would
work. Absent a voltage regulator, changing the speed would change the
voltage, but it will also change the frequency. I would think there
must also be some voltage regulating circuit in there that adjusts
the rotor field to maintain the proper voltage as the load varies.
I know that's how it's done on the home Generac standby generators and
it makes sense. And if it has a VR, then changing the speed should not
change the voltage.





I have not looked over my 5 kw generator in a while, but my little 700
watt Harbor Freight does have an adjustment screw that can set the speed
of the engine.