SAVONIUS TYPE WINDMILL

PROBLEM TO BE SOLVED: To solve the problem of becoming a large-scale constitution as a whole of a windmill, due to necessity of a strong installation frame, as stable and efficient rotation in a strong wind requires a structure of supporting at its opposite ends from both sides in the vertical direction of the windmill. SOLUTION: An impeller 1 has three blades 8 connected by a hub 9 arranged in the center in the vertical direction of the impeller 1 being a gravity center position. A disk plate 10 of a disk shape is also arranged in an end part in the vertical direction of the impeller 1. The impeller 1 is connected to a rotary shaft 2 in a central part of the hub 9. A distance between the hub 9 and a bearing 3 is set equal to a diameter or less of the rotary shaft 2. A round hole is opened in the disk plate 10 on the lower end of the impeller 1 so as not to contact with a casing 6. A natural frequency of the impeller 1 is designed so as not to exist in a rotating speed range having the possibility of rotating, by adjusting curvature of the blades 8 by considering so as not to impart adverse effect to the performance of the windmill. COPYRIGHT: (C)2008,JPO&INPIT