Generators are devices that convert mechanical energy into electrical power. They can use this power in an external circuit. Various mechanical energy sources can be used to make generators, such as internal combustion engines, steam turbines, water turbines, hand cranks, and windmills. These machines can also be used for stationary energy storage purposes. However, the most common use for generators is to create electricity for home or industrial use. This article will explore the different kinds of generators available today.
Homopolar generators, also called unipolar generators and disk dynamos, typically produce low voltages, though larger research-scale generators can produce hundreds of volts. They are also able to generate huge electrical currents – up to millions of amperes! Their low internal resistance also makes them useful in producing electrical energy. The magnetic field produced by these devices is due to the movement of electrons. In addition to this, homopolar generators are designed to have low internal resistance.
Induction AC motors are another example of generators. These devices use magnetic induction to transform mechanical energy into electric current. This is done by mechanically turning the rotor faster than the synchronous speed of the motor. The result is negative slip. Unlike other AC generators, these machines do not require any external modifications. Furthermore, induction generators have simple controls that allow them to recover energy. Unlike other AC generators, induction generators are also able to operate at a frequency that is compatible with the grid.