Vertical axis wind turbines
AssigneeCanadian Patents and Development Limited-Societe Canadienne Des Breyets et D'Exploitation Limitee
InventorPeter South
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Abstract
The invention relates to improvements in and relating to vertical axis wind turbines, particularly those of the "eggbeater" type. It has been found possible, in spite of previous beliefs that it was not so, to provide energy exchange means between the blades and the rotor to thereby smooth out cyclic variations in transmitted torque. The energy exchange means may be, for example, the provision of hinges between the blades and the rotor so that the blade is deflected in operation to transmit torque to the rotor in dependence not only on its fixed geometry but also in dependence on the deflection.
Claims10
A vertical axis cross-wind turbine having a number of blades, each blade being attached at its top and bottom end roots to a rotor and having energy exchange means provided between said blade roots and said rotor comprising means to provide lead/lag motion of said blade with respect to said rotor.
A vertical axis wind turbine having a number of blades, each having two ends and a body, the ends being mounted in upper and lower positions on a vertical axis rotor and the body extending outwards from the axis, the ratio of the height between the blade ends to the maximum diameter of the path described by their rotation being from 1 to 2, energy exchange means being provided between each blade and the rotor at said upper and lower positions, each energy exchange means comprising a hinge between the rotor and the respective blade, which hinge which permits lead/lag motion of the blade with respect to the rotor.
Dependencies are inferred from the claim text.