Downwind turbine system with free yawing

A turbine downwind horizontal axis (100) comprising a nacelle (150) having a rotor (130) comprising a hub and at least one blade in arrow (132), nacelle (150) which is suitable for swivel fastening to a tower (140) defines a pivot axis (151) about which winking nacelle (150), said turbine further comprising (100): - a generator (120) integrated into the hub; and - a damping yaw (110); wherein said yaw damper (110) comprises a permanent magnet generator (112).