- What mechanisms and materials are used when a wind turbine converts the rotational mechanical energy to electrical energy within the generator? And is it possible to create a very small turbine for generating small amounts of DC power this way?
I understand that the turbine drives rotational motion of a low and high speed shaft which rotates within the generator, but how exactly, and with what components/materials does this create electrical energy? Is there a minimum required rotational speed or torque required to generate electricity? Does this minimum vary by size of turbine and generator? Does it vary by load? Is there a simple way to generate or convert this AC current into DC instead? Is it possible to make a very small version of this, potentially around 15mm in diameter of turbine blades?