WIND TURBINE BLADE PITCH VARIATION DEVICE, PITCH VARIATION METHOD, PITCH VARIATION CONTROL DEVICE, AND WIND TURBINE

摘要

A pitch varying device, a pitch varying method and a pitch varying control device for a wind turbine blade and a wind turbine are provided according to the present application. The blade pitch varying device includes: a disc-type driving structure perpendicular to an axis of a pitch bearing, a track surrounding the axis of the pitch bearing being provided on the disc-type driving structure; a first linear telescopic driving mechanism connected to the track through a first clamping member capable of clamping the track, and the first linear telescopic driving mechanism and the first clamping member being connected through hinge connection; and a second linear telescopic driving mechanism connected to the track through a second clamping member capable of clamping the track, and the second linear telescopic driving mechanism and the second clamping member being connected through hinge connection. The pitch varying device for the wind turbine blade provided in the present application replaces an existing integral-type pitch varying system driven by a gear, realizes segmental pitch varying of the wind turbine, thereby overcoming friction loss between tooth faces of a driving gear and the pitch bearing in a pitch varying process, and prolonging the service life of the pitch bearing.