What are the types of generators?

There are various types of generators, and the following are the types of generators classified according to different standards:
According to principles:
Synchronous generator: It is the most commonly used type of generator, whose rotor (i.e. magnetic pole) is excited by DC current. During the rotation process, there is a constant magnetic tension between the rotor magnetic pole and the stator core. In modern power plants, synchronous generators dominate.
Asynchronous generator: It is not common, and its rotor speed is always slightly lower than the speed of the rotating magnetic field.
Single phase generator: A generator that outputs only one phase.
Three phase generator: A generator that outputs three phase differences, which is very common in modern power systems.
Divided by generation method:
Steam turbine generator: a generator driven by a steam turbine.
Hydroelectric generator: a generator driven by a water turbine.
Diesel generator: A generator driven by a diesel engine, commonly used as an emergency or backup power source.
Gasoline generator: a generator driven by a gasoline engine.
Divided by energy:
Thermal power generator: a generator that converts the thermal energy generated by the combustion of fossil fuels (such as coal, oil, natural gas, etc.) into electrical energy.
Hydroelectric generator: a generator that converts the kinetic energy generated by water flow into electrical energy.
Classified by power source:
Diesel generator set: a generator set driven by a diesel engine.
Gas generator set: a generator set driven by a gas turbine.
Gasoline generator set: a generator set driven by a gasoline engine.
Wind turbine: a generator set driven by wind power, commonly found in areas with abundant wind resources.
Solar power generation unit: A generator set driven by solar energy, usually used in conjunction with solar panels.
Hydroelectric generator set: a generator set driven by water flow, commonly found in hydroelectric power plants.
Coal fired power generation unit: a power generation unit that converts the thermal energy generated by coal into electrical energy.
Classified by electric energy method:
AC generator: A generator that outputs alternating current and is the main type in modern power systems.
DC generator: A generator that outputs direct current, but is less commonly used in modern power systems.