I am looking for a simple circuit to control the balde pitch on my wind turbine. I am using a 12v motor that will adjust the blade pitch, I will also mount a hall sensor on the generator, I am looking to keep it at 1800 RPM. Are there any simple circuits out there that can do this?

 

Maybe not too simple, but should be doable. Some parts might be:
Ref. oscillator
Hall sensor frequency conditioner
H bridge motor driver
Frequency comparator
Wind speed sensor
Load monitor