wind turbine generator and maintenance method for wind turbine generator

摘要

A wind turbine generator is provided with: a main shaft which supports a wind turbine rotor; a main bearing which rotatably supports the main shaft; a generator provided with a generator rotor and a stator; and a sleeve coupled to the generator rotor and is inserted onto the main shaft. The stator is provided with: stator magnetic poles arrayed in the circumferential direction of the main shaft; and first and second stator plates which are coupled to the main shaft relatively rotatably thereto to support the stator magnetic poles and arranged in the axial direction of the main shaft. The generator rotor is provided with: rotor magnetic poles arrayed in the circumferential direction; and at least one magnetic pole supporting structure coupled to the main shaft to support the rotor magnetic poles and provided between the first and second stator plates. The first and second stator plates and the rotor magnetic pole supporting structure are configured such that the rotor magnetic poles and the stator magnetic poles are detachable from the sleeve. With respect to the first and second stator plates and the rotor magnetic pole supporting structure, positions at which the rotor magnetic poles and the stator magnetic poles are detached from the sleeve are closer to the main shaft as reduction of distances from a closer end of the main shaft to the generator.