Patent ID: 7866946
Filing Date: 2011-01-11
Classification: F03D,F05B,Y02E

Abstract:
1. A method for operating a device to vary a blade setting angle on a rotor blade of a wind power plant, comprising a first variable drive ( 6 ) and a second variable drive ( 7 ) per rotor blade, a bearing element ( 5 ) acting between the rotor blade and a rotor hub which has a freely rotatable bearing ring ( 10 ), wherein the method comprises initiating a permanent rotation of the bearing ring ( 10 ) by the first variable drive ( 6 ), and adjusting the setting angle of the rotor blade by the second variable drive ( 7 ), characterized in that the first variable drive ( 6 ) initiates the permanent rotation of the bearing ring ( 10 ) only after a predetermined threshold value for a load is exceeded.