| 摘要 |
PROBLEM TO BE SOLVED: To generate power even by gentle wind and having durability to strong wind.SOLUTION: A lift type wind turbine having a fixed shaft 1, a rotating shaft 2 rotating around the fixed shaft, and blades 3 disposed in parallel with the rotating shaft 2, further includes blade supporting arms 4 connecting the blades and the rotating shaft 2, and supporting the blades so as to be expandable and contractable in the radial direction on the rotating shaft 2 as a center to move the blades in parallel, and energizing means 13, 14 expanding the blade supporting arms 4 radially outward by energizing the blades radially outward at all times, on the other hand, energizing the blades 3 radially inward by utilizing centrifugal force in rotating the blades 3, and contracting the blade supporting arms 4 radially inward when the force for energizing the blade radially inward is more than the force for energizing the blades 3 radially outward. In starting up, the blade supporting arms 4 are expanded radially outward to expand a radius of rotation of the blade 3 to a maximum radius, the blade supporting arms 4 are contracted radially inward by centrifugal force when a wind turbine starts the rotation, and a cut-in wind speed is achieved by the time when at least the radius of rotation of the blades 3 becomes minimum. |
