Brake system with expansion absorbing means, generator and wind turbine

Abstract

A brake system which includes rotor assembly and a brake disc is disclosed. The brake system is arranged to rotate around an axis of rotation. The brake disk includes at least one flexible portion. The at least one flexible portion is configured for absorbing the expansion of the brake disc.

1 . A brake system, comprising:
 a rotor assembly comprising an axis of rotation;   a brake disc arranged to rotate around the axis of rotation, the brake disk comprising a an first part connected to the rotor assembly, a second part radially offset from the first part, a flexible portion flexibly attaches the first part to the second part, the flexible portion configured for bending at the attachment between the flexible portion and the first part and between the flexible portion and the second part in order to absorb an expansion of the brake disk.   
     
     
         2 . The brake system as claimed in  claim 1 ,
 wherein the brake system further comprises a stator assembly.   
     
     
         3 . The brake system as claimed in  claim 1 ,
 wherein the rotor assembly comprises an outer portion which is located radially outward of the stator assembly,   wherein the brake disk connects to the rotor assembly at the outer portion,   wherein the stator assembly comprises a frictional member configured for frictionally engaging at least a portion of the brake disc.   
     
     
         4 . The brake system as claimed in  claim 3 , wherein the frictional member comprises a brake calliper. 
     
     
         5 . The brake system as claimed in  claim 3 ,
 wherein the brake disc extends radially inward from the outer portion of the rotor assembly to the rotation axis.   
     
     
         6 . The brake system as claimed in  claim 3 ,
 wherein the stator assembly comprises a stationary shaft and the frictional member is connected to the stationary shaft.   
     
     
         7 . The brake system as claimed in  claim 6 ,
 wherein the frictional member extends radially outward from the stationary shaft.   
     
     
         8 . The brake system as claimed in  claim 3 ,
 wherein the frictional member comprises a brake calliper on each side of the brake disc.   
     
     
         9 . The brake disk system as claimed in  claim 1 ,
 wherein the bending is effective to radially displace at least the first or second part.   
     
     
         10 . The brake disk system as claimed in  claim 1 ,
 wherein the first and second parts are longitudinally offset from each other along the axis of rotation.   
     
     
         11 . The brake disk system as claimed in  claim 10 ,
 wherein at least the first or second part is longitudinally displaced by the bending.   
     
     
         12 . The brake disk system as claimed in  claim 1 ,
 wherein the first part is annular.   
     
     
         13 . The brake disk system as claimed in  claim 1 ,
 wherein the second part is annular.   
     
     
         15 . A generator for a wind turbine, comprising:
 a brake system according to  claim 1 .   
     
     
         16 . A wind turbine, comprising:
 a tower;   a nacelle located on top of the tower;   a hub mounted to the nacelle; and   a generator located inside the nacelle, wherein the generator comprises a brake system according to  claim 15 .   
     
     
         17 . The wind turbine as claimed in  claim 16 ,
 wherein the brake system is connected to the generator and/or to the hub.