Patent ID: 8523521
Filing Date: 2013-09-03
Classification: F03D,F05B,Y02E,Y10T

Abstract:
1. A wind turbine generator, comprising: a rotor hub; a wind turbine blade; a bearing including an outer ring and an inner ring, the outer ring being coupled to the rotor hub, the inner ring being coupled to the wind turbine blade; a ring gear provided on the inner surface of the inner ring; a motor; a pinion gear that meshes with the ring gear; an electric pitch-control device configured to perform pitch-angle control by using the motor to drive the pinion gear; and a meshing-region changing mechanism configured to change a pitch-angle-control meshing region of the ring gear that meshes with the pinion gear during the pitch-angle control; wherein the meshing-region changing mechanism comprises a fixing/releasing switching part that switches between a fixed state and a released state, the outer surface of the ring gear being fixed to the inner surface of the inner ring in the fixed state, the outer surface of the ring gear being released from the inner surface of the inner ring in the released state.