Generator points: DC generators and alternators.
Alternator points: Synchronous generators and asynchronous generators (rarely used).
Alternator can also be divided into single-phase generator and three-phase generator. There are many kinds of generators. The principle is divided into synchronous generator, asynchronous generator, single-phase generator and three-phase generator. It is divided into turbogenerator, hydro-generator, diesel generator, gasoline generator and so on from the way of production.From the energy is divided into firepower generators, hydroelectric power machines and so on.