The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 2015
Filed:
Nov. 22, 2011
Applicants:
Jesper Lykkegaard Andersen, Hornslet, DK;
Jens Bay Madsen, Arhus, DK;
Inventors:
Jesper Lykkegaard Andersen, Hornslet, DK;
Jens Bay Madsen, Arhus, DK;
Assignee:
Vestas Wind Systems A/S, Aarhus N., DK;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F03D 7/02 (2006.01);
U.S. Cl.
CPC ...
F03D 7/0224 (2013.01); F03D 7/0264 (2013.01); F05B 2260/76 (2013.01); F05B 2270/1074 (2013.01); F05B 2270/506 (2013.01); F05B 2270/604 (2013.01); Y02E 10/723 (2013.01);
Abstract
A pilot circuitry is disclosed for controlling the activation of an emergency feathering system of a wind turbine by means of a pilot pressure, wherein the pilot circuitry comprises at least two parallel control circuits for providing a pilot pressure. Additionally, a selector may be provided for selectively preventing a control circuit from providing the pilot pressure to the emergency feathering system in case of malfunction of the control circuit.