Small Wind turbine for Variable Speed with Flexible Blades and Automatically Mechanical Pitching

Wind energy have for many years been a growing alternative to fossil energy. The sizes of turbines are increasing to megawatt level. Wind turbines operate in a wide range of wind speeds but are shot down for high wind speeds. Traditional concepts are relatively stiff and have a cause stress on the gearbox. The turbine described in this paper overcomes some of these challenges by having flexibly and pitchebly blades. This means that the turbine can operate at turbulent sites and withstand wind burst without high stress level on the gearbox. This paper describes the mechanical principle, electrical power production and measurements from the sites. At the end of the paper conclusions are described.