Senvion Se

Matthias Bruckner

Alf Trede

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&#x3e;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&#x3e;M&#x3e;M/n, and where the other (n&#x2212;m) yaw brakes are actuated to generate substantially the same constant holding moment M, where m*M+(n&#x2212;m)*M&#x2dc;=M, and M/n&#x3e;M/n&#x3e;M

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Rendsburg, Germany

Matthias Bruckner