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. 07, 2016
Filed:
Nov. 16, 2011
Alf Trede, Immerstedt, DE;
Matthias Bruckner, Rendsburg, DE;
Alf Trede, Immerstedt, DE;
Matthias Bruckner, Rendsburg, DE;
SENVION SE, Hamburg, DE;
Abstract
The present invention provides an apparatus for the controlled rotation of a nacelle of a wind turbine, which includes a control device and n of yaw brakes. In standstill operation, the n yaw brakes are actuated to impart a standstill holding moment Mfor holding the nacelle, and the n yaw brakes impart a substantially equal first holding moment. In tracking operation, the n yaw brakes are actuated to impart a tracking holding moment, M, which is lower than the standstill holding moment M(M>M). The control device, in tracking operation, actuates a number m of the n yaw brakes to generate substantially the same constant holding moment M, where M/n>M>M/n, and where the other (n−m) yaw brakes are actuated to generate substantially the same constant holding moment M, where m*M+(n−m)*M˜=M, and M/n>M/n>M