Patent ID: 6921243

Claim:
A system for producing electricity from wind energy, the system comprising a vertical mast having a bottom end portion fixed to a support surface, a nacelle mounted to turn about a vertical axis on atop end portion of the mast, a rotary portion comprising a hub and two or more substantially radial blades fixed to the hub, a bearing in which the rotary portion rotates and which has a substantially horizontal axis, and an electricity generator comprising a stator secured to the nacelle and a rotor secured to the hub of the rotary portion by a fixing member substantially perpendicular to the rotation axis of the rotary portion, wherein: both the rotor and the stator have respective active portions each in the form of a disk carrying facing electromagnetic members, the rotary portion rotates on the nacelle in a single bearing whose diameter is 80%-100% the diameter of a circle inscribed in the cross section perpendicular to the axis of the rotary portion of a surface formed by areas in which the blades are connected to the hub, and the fixing member fixing the rotor to the hub is adjacent the bearing along the axial direction of the bearing.