Patent ID: 8915715
Filing Date: 2014-12-23
Classification: F03D,F05B,F16C,Y02E

Abstract:
1. A wind energy installation ( 17 ) whose rated electrical power P W,rated is at least 1.5 MW comprising a rotor whose rotor diameter is at least 70 m, and/or which has at least one rotor blade bearing with a pitch diameter D pw of at least 1,500 mm, wherein the rotor blade bearing is configured as a rolling slewing bearing comprising two annular, mutually concentric, oppositely rotatable elements for connection to a rotor hub, on the one hand, and for connection to a rotor blade, on the other hand, wherein provided between the two connecting elements is a fully circumferential, slot-shaped clearance that is sealed on both end faces of said bearing and is filled with a lubricant, with a surface area F Q of the entire bearing-ring cross-section, without voids, and with a radius R F,SP of the centroid of the cross-sectional area, with a volume V=F Q *2*π*R F,SP , calculated from the surface area F Q of the entire bearing-ring cross-section, without voids, multiplied with the perimeter 2*π*R F,SP at the centroid of the cross-sectional area, and with a total dynamic axial load rating C a,total , defined according to DIN ISO 281, of all rows (μ) of rolling elements ( 9 , 10 ), which participate in a force transmission in an axial direction, and wherein provided for adjusting said rotor blade is at least one open-loop and/or closed-loop control system, which, to minimize the static or dynamic structural load and/or to damp vibrations and/or to compensate for interference forces and moments, as by generating counterforces, adjusts said rotor blades even when a constant wind velocity v ∞ does not warrant it, characterized in that in the context of said rotor blade rolling bearings, a) for those rows of rolling elements which participate at the force transfer in axial direction, surface-hardened raceways without any prominences or depressions are provided, b) and wherein the thickness d c) the total dynamic axial load rating C if F if F d) and wherein, for minimizing the structural load and/or for damping of vibrations, there is provided an open- or closed-loop control system for adjusting said rotor blades, which uses as an input variable a signal from at least one sensor disposed on, at or in said wind power installation, namely the signal of at least one position or angle sensor coupled to a main shaft of the rotor, and the signal of at least one sensor for a wind velocity disposed in an upper region of a tower of the wind power installation, e) and wherein there is provided an interconnection between the wind power installation and adjacent wind power installations, so that the wind power installation can learn via sensors, which are not disposed on, at or in said wind power installation, but at adjacent wind power installations, from a squall even before the latter hits, to adjust the pitch of the rotor blades in such a way that when the squall does hit, the wind force is wholly or partially kept away from the tower of the wind power installation.