horrible schematics, but many manuals don't provide that good of technical documentation. IMO, there is no way to fit this generator with an AVR, short of a custom engineered circuit...
Here is how I understand this type. The rotor spins and residual magnetism induces a voltage in the aux winding that has a capacitor on it. This circuit resonates which inturn induces a voltage back onto the rotor via a coupling winding on the rotor. This voltage is rectified by a diode on the rotor and the resultant DC current excites the rotor winding which builds a magnetic field and induces voltage in the main stator windings. The rating for the capacitor controls how that aux winding resonates which inturn controlls how much voltage is produced at a given RPM. The load on the generator also has an effect on the aux winding which boosts voltage in response to load increase to help keep the voltage stable with load changes.
When working properly, it is my understanding that this type of excitation and regulation works very well. Just what exactly are you trying to operate that this thing wont power? This is a more advanced play on the harmonically excited generator. My simple harmonically excited ST generator runs every piece of electronic equipment I have thrown at it. The first step for most modern electronics is taking the AC power provided and immediatly using a switching power supply to convert it to DC. Since most electronics are made for a global market, the voltage input tollerances are pretty wide. It is not uncommon to see voltage input specs these days that range from 100VAC to 250VAC...
