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US 9,803,620 B2Granted
Pitch system for a wind turbine
AssigneeVestas Wind Systems A/S
InventorErik Garde
Life of this patent
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Abstract
A wind turbine comprises a hub, a blade rotatably mounted to the hub, and a pitch system. The pitch system includes a support, a first drive configured to rotate the blade relative to the support, a second drive configured to rotate the support relative to the hub. The support is configured to be selectively fixed relative to the blade and the hub such that the first or second drive may be used to pitch the blade. A method of pitch corresponding to this operation is provided.
Claims8
A wind turbine, comprising:
- a hub;
- a blade rotatably mounted to the hub;
- and
- a pitch system including:
- a support;
- a first drive configured to rotate the blade relative to the support;
- and
- a second drive configured to rotate the support relative to the hub;
- wherein the support is configured to be selectively fixed relative to the blade and the hub, wherein one of the first and second drives is externally powered and comprises an electric motor, and the other of the first and second drives is internally powered and comprises a hydraulic actuator, and wherein the externally-powered drive is configured to charge the internally-powered drive.
6 more elements
Dependencies are inferred from the claim text.