Vertical axis wind turbine rotor construction

Abstract

A Savonius vertical axis wind turbine (VAWT) rotor is easily and simply constructed while having enhanced functionality. The rotor includes a shaft that is vertical in use, a number (desirably at least four) of vane support hubs each having a number (desirably three) of at least partially curved spokes extending radially outwardly, and a number of vanes corresponding to the number of spokes. The vane support hubs are operatively connected directly to the shaft and spaced vertically from each other along the shaft to provide a plurality of sets of vertically spaced spokes. The vanes, one for each set of spokes, are operatively connected to the spokes to provide surface area for engaging wind and rotating the shaft when in use. Desirably the vane support hubs are operatively connected to the shaft using mechanical fasteners, and the vanes are connected to the spokes using mechanical fasteners. Structural end caps are not necessary, and therefore the rotor is devoid of them. The vane support hubs and spokes are desirably integral and made of metal or fiber reinforced plastic, and the vanes may be made of sheet metal. Further provided is a vane support assembly for a Savonius or open helix VAWT including a vane support hub defining an opening, a number of at least partially curved spokes integral with the vane support hub and extending radially outwardly, and an adaptation part of the hub which allows it to be operatively connected to a shaft extending through the opening. Also provided is a complete Savonius or open helix VAWT.