Fixation device

Abstract

A fixation device for fixing a shaft connecting a rotor and a generator of a wind turbine, the fixation device comprising: a rotor lock for locking the shaft providing a locking clearance; and a rotor brake for braking the shaft; wherein the rotor lock is arranged for positioning the shaft in a selectable angular position within the locking clearance of the rotor lock.

What is claimed is: 
     
         1 . A fixation device for fixing a shaft connecting a rotor and a generator of a wind turbine, the fixation device comprising:
 a) a rotor lock for locking the shaft providing a locking clearance; and   b) a rotor brake for braking the shaft;   c) wherein the rotor lock is arranged for positioning the shaft in a selectable angular position within the locking clearance of the rotor lock.   
     
     
         2 . The fixation device of  claim 1 , wherein the rotor lock comprises a positioning member for positioning the shaft in the selectable angular position. 
     
     
         3 . The fixation device of  claim 2 , wherein the positioning member comprises a spring member for a flexible positioning of the shaft in the selectable angular position. 
     
     
         4 . The fixation device of  claim 2 , wherein the positioning member comprises a locking pin with a flexible portion for engagement with a locking recess of the rotor lock. 
     
     
         5 . The fixation device of  claim 4 , wherein the locking pin comprises a stiff portion for an engagement with the locking recess of the rotor lock only above a threshold torque. 
     
     
         6 . The fixation device of  claim 2 , wherein the positioning member comprises a flexible support for the locking pin of the rotor lock. 
     
     
         7 . The fixation device of  claim 2 , wherein the positioning member comprises a positioning disk with a positioning hole. 
     
     
         8 . The fixation device of  claim 7 , wherein the positioning disk with the positioning hole is arranged for an engagement of the positioning hole with the locking pin of the rotor lock. 
     
     
         9 . The fixation device of  claim 8 , wherein the positioning hole provides less clearance than the locking recess in case of an engagement with the locking pin. 
     
     
         10 . The fixation device of  claim 2 , the positioning member comprising a positioning region and a locking region for an engagement with a locking recess. 
     
     
         11 . The fixation device of  claim 2 , the positioning member comprising a pin with a profile selected from a stepped profile, an elliptical profile and a tapered profile. 
     
     
         12 . The fixation device of  claim 2 , wherein the positioning member provides a positioning clearance smaller than the lock clearance. 
     
     
         13 . A method for locking a shaft of a wind turbine with a rotor lock for locking the shaft, a rotor brake for braking the shaft and a positioning member for a positioning of the shaft in a selectable position, the method comprising:
 a) applying the positioning member;   b) waiting until the shaft is positioned in a selectable position by the positioning member;   c) applying the rotor brake; and,   d) applying the rotor lock.   
     
     
         14 . The method of  claim 13 , wherein the shaft is positioned in a selectable position within a middle range between a first limit stop and a second limit stop of the rotor lock using the positioning member. 
     
     
         15 . The method of  claim 14 , wherein the middle range is within the middle third of the clearance of the rotor lock. 
     
     
         16 . A wind turbine comprising a rotor, a generator, a shaft for transmitting torque between the rotor and the generator, and a fixation device for fixing the shaft, the fixation device comprising:
 a) a rotor lock for locking the shaft providing a lock clearance between a first limit stop and a second limit stop; and,   b) a rotor brake for braking the shaft;   c) wherein the rotor lock is arranged for positioning the rotor shaft within the lock clearance, wherein the positioning clearance is smaller than the lock clearance.   
     
     
         17 . The wind turbine of  claim 16 , wherein the rotor lock is adjusted for a positioning of the shaft within a middle range between the first limit stop and the second limit stop of the rotor lock. 
     
     
         18 . The wind turbine of  claim 16 , wherein a sum of the brake clearance and the brake deflection is smaller than half of the sum of the lock clearance and the lock deflection. 
     
     
         19 . The wind turbine of  claim 16 , wherein the rotor lock comprises a flexible member for a locking pin of the rotor lock. 
     
     
         20 . The wind turbine of  claim 19 , wherein the flexible member of the locking pin is arranged for an exclusive engagement with a locking stop in case of a torque of the shaft below a threshold torque.