Abstract: A wind turbine blade root having: an annular structure extending about a main axis and made of a composite material including a matrix and reinforcing fibers; first longitudinal reinforcing elements, which are incorporated in the annular structure, extend in the direction of the main axis, and are spaced apart in a circle about the main axis; and an annular reinforcing element connecting the first longitudinal reinforcing elements and having first coupling portions for connection to the first longitudinal reinforcing elements.

Abstract: A method of fabricating a wind turbine blade tubular spar, wherein the tubular spar extends along a designated axis, is made of reinforced polymer material having fibers arranged in at least two directions, and a polymer matrix incorporating the fibers, and has two caps and two webs; the method including the steps of: molding and cross-linking at least part of a cap or web in composite material; molding and cross-linking an L-shaped structure, which has two opposite parallel flanges, and at least partly incorporates the previously molded, cross-linked cap or web of composite material; repeating the above steps to mold and cross-link a further L-shaped structure; and joining the two cross-linked, L-shaped structures, with the flanges positioned facing in pairs.

Abstract: A wind turbine blade root having: an annular structure extending about a main axis and made of a composite material including a matrix and reinforcing fibers; first longitudinal reinforcing elements, which are incorporated in the annular structure, extend in the direction of the main axis, and are spaced apart in a circle about the main axis; and an annular reinforcing element connecting the first longitudinal reinforcing elements and having first coupling portions for connection to the first longitudinal reinforcing elements.

Abstract: A method of fabricating a wind turbine blade tubular spar, wherein the tubular spar extends along a designated axis, is made of reinforced polymer material having fibers arranged in at least two directions, and a polymer matrix incorporating the fibers, and has two caps and two webs; the method including the steps of: molding and cross-linking at least part of a cap or web in composite material; molding and cross-linking an L-shaped structure, which has two opposite parallel flanges, and at least partly incorporates the previously molded, cross-linked cap or web of composite material; repeating the above steps to mold and cross-link a further L-shaped structure; and joining the two cross-linked, L-shaped structures, with the flanges positioned facing in pairs.

Abstract: A wind turbine is provided with a rotor rotatable about a rotor axis and having a plurality of blades rotatably fitted to a hub about a blade axis and a plurality of pitch actuators configured to adjust the pitch angles of the blades; a brake controlled by a brake actuator configured to arrest the rotor; a rotating electric machine connected to the rotor; an inverter configured to control the rotating electric machine; and a control system including a plurality of image reflection measuring devices configured to detect the deformations of each blade and configured to emit control signals configured to selectively control at least one of pitch actuators; the brake actuator; and the inverter as a function of the deformations retrieved.