Design and Development of Vertical Axis Wind Turbine Using Maglev System

A combined savonius and darrieus vertical axis wind turbine would have many advantages over an individual savonius or darrieus rotor. A savonius produces high torque which would be useful in self-starting and darrieus rotor having a high tip speed ratio useful for electrical generation. Therefore the combined effect is more. This developed a two bucket savonius rotor and placed it on the central shaft of a traditional darrieus. Though the tip speed ratio is a still a little low for use as an electrical generator, the research demonstrated a simple way to enable a darrieus VAWT to be self-starting and achieve higher efficiencies. Historically VAWTs cost more to operate and maintain than HAWTs Finally, traditional Darrieus rotors are not self-starting under most of wind conditions and manufacture of their blades is a challenge because of the complex shape which adds expense to the turbine. However, evidence shows that a Darrieus turbine using fixed geometry symmetrical airfoils can self-start in the field during atmospheric gusting it was suggested that using a Darrieus blade together with a Savonius blade has better performance than using them individually according to self-start ability and efficiency of the turbine. Using a counter rotating wind turbine with a freely rotating generator can produce higher amounts of electric power than common wind generators.