This wind turbine model makes its electricity with a simple generator which produces pulses of current, or alternating current. It does so by passing strong magnets over coils of fine wire. Each time a magnet passes over a coil, the coil becomes energized with electricity. With 4 coils connected together in series, the result is a quadrupling of the voltage.
The small Wind Turbines are upwind, horizontal-axis wind machines where the rotor spins in front of the tower about a line parallel with the horizon.
There are three blades made of mainly wood although cheap composite materials, such as fiberglass (glass reinforced polyester) can also be used.
Because of their tiny size, small Windmills cannot afford the complexities of having yaw motors and mechanical gear drives of the bigger upwind Wind Turbines.
Small Wind turbines use tail vanes to point the rotor into the wind. These Turbines also have a system for controlling the rotor in high winds. The Wind turbine "furl" or fold about a hinge so that the Blade rotor assembly swings toward the tail vane.
The alternator is a Permanent Magnet Axial Flux type comprising of strong ‘Rare Earth’ Neodymium Iron Boron Magnets.
The vertical axis wind turbine is, modelled after a design by the Finnish engineer S.J. Savonius in 1922. His idea was to mount two half-cylinders on a vertical shaft. It is simple to build, and can accept wind from any direction