This is a schematic-simulation of a NEMA 17 stepper motor being used to supply power. A 2S Lithium Polymer battery (7.2V) will be kept charged and supply supplemental power to the circuit. The generator (motor) is physically rotated, slowly by other means.
The (2) signal generators used in the schematic are symbolic of the windings of the stepper. These are 180 degrees out of phase with each other. They are both used in the circuit to double the voltage supplied.
290 RPM is where the zener kicks in and limits the maximum voltage limit. Running the generator faster than this will produce more wattage than the circuit design.
