Patent ID: 8177510
Filing Date: 2012-05-15
Classification: F03D,F05B,Y02E

Abstract:
1. A braking system in a wind turbine, the braking system comprising: one or more motors for driving a part of the wind turbine; a first group of one or more brakes for braking the part of the wind turbine, each brake in the first group of one or more brakes having a normally-closed default state; a second group of one or more brakes for braking the part of the wind turbine, each brake in the second group of one or more brakes having a normally-open default state; wherein the first group of one or more brakes is in a normally closed condition and the second group of one or more brakes is in a normally open condition, so that a default brake torque can be selectively chosen that is less than a maximum brake torque.