Patent ID: 6283710
Filing Date: 2001-09-04
Classification: F03D,F05B,Y02E,Y10S

Abstract:
A vertical axis wind turbine rotor, comprising:a turbine rotor supported at a given level on a support structure for wind-driven rotation in a selected direction about a vertical axis;a hub having a rotational axis substantially coinciding with said vertical axis;a plurality of vanes equiangularly distributed about said hub;structural members connecting said vanes with said hub such that as wind acts on said vanes in rotational succession, said hub is caused to rotate about said rotational axis;each of said vanes including a generally inclined planar outer frame including a top section and a bottom section extending generally outwardly, so as to have a proximal end located nearer to said hub and a distal end located further from said hub, with said top section rotationally leading said bottom section in said direction of rotation, said top and bottom sections constituting a substantially rigid frame structure, said frame structure being inclined at an angle of about 45 degrees relative to the instantaneous direction of movement of the respective frame as said turbine rotor rotates in said selected direction;each of said vanes further including a sail made of lightweight, resilient, substantially wind-resistant material having a head edge and a foot edge, said sail having said head edge and foot edge thereof respectively attached to the top and bottom sections of a respective said frame structure so as to be effectively spread within the respective frame to become full when facing and moving with the wind, and to collapse to a drag-minimizing shape when moving across and against and not facing the wind; andsaid vanes having respective centers of pressure which are all disposed substantially in a same substantially horizontal plane, which is substantially coplanar with said level at which said turbine rotor is supported for rotation on said support structure.