PITCH DRIVE SYSTEM AND METHOD

摘要

Pitch drive system for actively adjusting a pitch angle of a wind turbine blade (210) relative to a wind turbine hub (220), the system comprising a fine pitch drive and a coarse pitch drive, characterized in that the fine pitch drive comprises a first bearing arrangement (260) and first actuation means (TF), for rotationally supporting and driving the blade through a relatively small range of angular motion, and in that the coarse pitch drive comprises a second bearing arrangement (250) and second actuation means (TC) for rotationally supporting and driving the blade through a relatively large range of angular motion.