Blade pitching

A blade pitch system for a wind turbine, comprising:

• a blade;
• a rotor hub;
• a first bearing ring fixed to the rotor hub, and a radially opposite second bearing ring fixed to the blade, with rolling elements between the first bearing ring and the second bearing ring;
• a mobile link having an outer circumference fixed to the blade or to the second bearing ring;
• a static link having an outer circumference fixed to the rotor hub or to the first bearing ring;
• a motor coupled to a central reduction gearing, wherein
• a rotatable output of the central reduction gearing is fixed to the mobile link that is joined to a blade and allows rotation of the blade around a longitudinal axis of the blade, and
• a static part of the central reduction gearing fixed to the static link, wherein
• the system further comprises one or more flexible couplings configured to:
• (1) directly couple the rotatable output of the central reduction gearing to the mobile link;
• or (2) directly couple the static part of the central reduction gearing to the static link such that a torque about the blade longitudinal axis is transmitted between the blade and the reduction gearing while substantially limiting transmission of other loads.