Automobile generator is the main power source of automobile. Its function is to supply power to all electrical equipment (except
starter) and charge the battery when the engine is running normally (above idle speed). On the basis of three-phase stator windingof common alternator, increase the number of winding turns and lead out the terminal, and add a set of three-phase bridge rectifier. At low speed, it is output by the primary winding and the secondary winding in series, while at high speed, it is only output by the primary three-phase winding. Automobile generator can be divided into DC generator and AC generator.