Basics: Alternator

Wind Turbine Works builds axial flux permanent magnet wind turbine alternators developed by Hugh Piggott.

Advantages of the axial flux permanent magnet alternator:

Disadvantages of the axial flux permanent magnet alternator:

The magnets are mounted on two steel disks to concentrate and channel the magnetic fields across the stator coils sandwiched between the magnet disks.  If a paper clip will stick to the back side of a steel disk, the steel is not thick enough and magnetic flux is being wasted.  The stators are typically 3 phase, with 3 coils per every 4 magnets, wired in star connection with the wild AC converted to DC using rectifiers.