What is a generator?

A generator turns mechanical input into DC electricity.
The mechanical input requires energy, this energy can be from a number of sources.
e.g. Hydro (water), wind, fossil fuels, bio fuels etc.

The heart of the generator is the alternator, there are 2 main types of alternator using permanent magnets.

The first is a radial flux alternator. The rotor has magnets are mounted around a cylinder. The stator is on the inside of a larger cylinder. When the rotor spins inside the stator, AC electricity is made.

The second is a twin rotor axial flux generator. The rotors are flat metal plates that have magnets mounted on one face. The rotors are set-up with the magnet face attracting to each other. The stator is between the 2 rotors. When the rotors spin, AC electricity is made.

To turn AC to DC a bridge rectifier and capacitor are used.

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