Wind Energy

In summary, a Wind Generator´s blade rotation converts the wind´s Kinetic Energy into rotational mechanical momentum to a shaft. The rotating shaft turns a Generator Assembly, which makes electricity. This electricity is transmitted through wiring down the tower to its end use.

The blades are engineered airfoils, matched to the Generator, that capture the wind´s mechanical energy. Most wind generators use three blades.

This is the best compromise between the highest efficiency possible (single blade) and the balance that comes with multiple blades. Together, the blades and hub are attached to the rotor, which is the collector of the system, intercepting the winds that pass by. Most turbines on the market today are upwind facing—their blades are on the windward side of the tower. A few downwind facing machines are available, but neither configuration has a clear performance advantage over the other.

 In most smaller-scale designs, the rotor is connected directly to the shaft of a generator, which creates three-phase AC.  Three-phase electricity means that the voltage and frequency vary continuously with the wind speed. They are not fixed like the 50/60 Hz, 110/120 VAC electricity coming out of common household outlets. The output is rectified to DC to either charge batteries or feed a Grid Inverter. In most designs, the rotor is usually connected directly to the generator, which eliminates the additional maintenance of gears. In systems 20 KW and larger, as well as some smaller wind systems (like the Endurance, Tulipo, or Aircon), a gearbox is used to increase alternator speed from a slower turning rotor.

In the most common systems, the blades must turn to face the wind, so a yaw bearing is needed, allowing the wind turbine to track the winds as they shift direction. The tail directs the rotor into the wind. A governing system limits the rotor rpm as well as generator output to protect the turbine from high winds. A shutdown mechanism is also useful to stop the machine when necessary, such as during an extreme storm, when you do not needthe energy, or when you want to service the system.