| 摘要 |
<p>A Savonius vertical axis wind turbine rotor, that is effective yet relative ly easy to manufacture, includes a number of spokes, vanes, and fasteners. Each spoke has a hub having a central opening, three at least partially arcuate ribs extending radially outwardly from the hub with inner (concave) and outer (convex) surfaces, and a number of channels defined in at least one of the inner and outer surfaces. The vanes are of sheet material generally conforming to an inner or outer surface of a rib and have openings aligned with the channels. First fasteners pass through the openings and cooperate with second fasteners provided in the channels. Each spoke is desirably in three substantially identical pieces, each piece comprising a hub segment and a generally radial rib. Two of the spoke pieces may be joined by a bridging piece, and two of the pieces joined by a clamping mechanism which draws the pieces toward each other to reduce the size of the central opening to clamp onto a shaft in the central opening . Each rib has a free end opposite the hub, and desirably a strut or bar extending between a central portion of the rib and a portion adjacent the free which increases the rib strength. A rigid spoke piece per se, as described above, is also provided. Still further there is a 2 or 3 blade Savonius rotor with the blades having generally convex and concave surfaces (or a helical rotor), a generat or or other driven element, and a drive connecting the generator to the rotor. The drive automatically increases the effective gear ratio between the generator and rotor as the speed of rotation of the rotor increases.</p> |
