Wind turbine generator

Abstract

Provided is a wind turbine generator including an electric pitch-control device that efficiently utilizes the entire circumferential teeth of a ring gear of a wind turbine blade so as to eliminate the need for work at high elevation using a crane or the like even when the teeth of the ring gear are partly broken. A wind turbine generator having an electric pitch-control device that performs pitch-angle control by using a motor to drive a pinion gear that meshes with a ring gear of a wind turbine blade includes a plurality of pinion-driving-mechanism securing supporters or a fixing/releasing switching part as a meshing-region changing mechanism that changes a pitch-angle-control meshing region of the ring gear that meshes with the pinion gear during the pitch-angle control.

1 . A wind turbine generator having an electric pitch-control device that performs pitch-angle control by using a motor to drive a pinion gear that meshes with a ring gear of a wind turbine blade, the wind turbine generator comprising:
 a meshing-region changing mechanism that changes a pitch-angle-control meshing region of the ring gear that meshes with the pinion gear during the pitch-angle control.   
     
     
         2 . The wind turbine generator according to  claim 1 , wherein the meshing-region changing mechanism comprises selectable securing supporters for the electric pitch-control device, the securing supporters being provided in a rotor hub at multiple locations in a circumferential direction of the ring gear. 
     
     
         3 . The wind turbine generator according to  claim 1 , wherein the meshing-region changing mechanism comprises fixing/releasing switching part provided between the ring gear and the wind turbine blade.