The operating principle of a generator is based on Faraday's law of electromagnetic induction, which states that an electromotive force (voltage)-and thus an electric current-is induced in a conductor placed within a changing magnetic field. Generators convert mechanical energy (such as the rotation of a turbine) into electrical energy; typical generators consist of components such as a rotor, a stator, and either slip rings and brushes or a commutator. An external power source drives the rotor to spin, causing the magnetic field strength within the stator coils to vary periodically. In accordance with Faraday's law, this induces an alternating electromotive force in the coils, generating sinusoidal alternating current (AC), which is then conducted to an external circuit via slip rings and brushes.
Wind power generation systems convert wind energy into electrical energy. The process begins not with the wind simply "pushing" the turbine blades, but rather flowing across them to create a pressure difference between the front and back surfaces. This pressure difference generates lift, causing the turbine to rotate and drive the rotating shaft within the gearbox. The mechanical energy from the rotating turbine subsequently drives the generator rotor to spin and produce electricity, thereby outputting an alternating voltage.
The triboelectric nanogenerator (TENG) is an emerging platform technology for achieving electromechanical energy conversion.
