Spar cap, wind turbine blade as well as method of manufacturing a spar cap

EP4680855A1Pending Publication Date: 2026-01-21GAMESA INNOVATION & TECH SL
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Patent Information

Application Number
EP2024722623
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-05-12
Filing Date
2024-04-29
Publication Date
2026-01-21

AI Technical Summary

Technical Problem

Large wind turbine blades manufactured with stacked pultruded planks experience sudden axial stiffness increases at plank ends, leading to non-optimum design and increased costs due to material extension to manage strain, resulting in a structurally safe but expensive blade.

Method used

A spar cap design featuring plate-shaped pultruded main bodies stacked with tapered ends and strategically placed stiffening bodies to distribute loads uniformly, reducing axial strain fluctuations and allowing shorter plank lengths, thus enhancing durability and cost-effectiveness.

Benefits of technology

The design achieves a more uniform stiffness distribution along the wind turbine blade, reducing material usage and costs while maintaining structural integrity, resulting in a cost-effective and durable spar cap and blade.

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    Figure EP2024061772_21112024_PF_FP_ABST
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Abstract

Spar cap, wind turbine blade as well as method of manufacturing a spar cap The invention relates to a spar cap (1), a wind turbine blade (200) and a method of manufacturing a spar cap (1) for a wind turbine blade (200). The spar cap (1) comprises a plurality of plate-shaped pultruded main bodies (21, 22, 23, 24) which are arranged one above the other in a stacking direction (SD) to form a main body stack (10). Furthermore, the spar cap (1) comprises at a first end face (11) of the main body stack (10) a first main body end (21a) of a first main body (21) of the plurality of main bodies (21, 22, 23, 24) which is arranged offset in the longitudinal direction (LD) of the spar cap (1) relative to a first main body end (22a) of a second main body (22) of the plurality of main bodies (21, 22, 23, 24) on an upper side of the second main body (22) in such a manner that a transition portion is formed by the second main body (22) between the first main body end (21a) of the first main body (21) and the first main body end (22a) of the second main body (22), wherein the second main body (22) is arranged adjacent to the first main body (21). In addition, the spar cap comprises at least a first stiffening body (31, 32), wherein the at least one first stiffening body (31, 32) is arranged at least at the first main body end (21a) of the first main body (21) and at least partially at an upper side (22c) of the second main body (22) in the transition portion formed by the second main body (22) for at least partially carrying longitudinal loads running at least in the longitudinal direction (LD) of the spar cap (1) and transmitting the longitudinal loads to the main body stack (10).
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