Patent ID: 9458836
Filing Date: 2016-10-04
CPC Classification: F03D,F05B,F16F,F16H,Y02E

Claim Text:
1. A wind turbine, comprising: a wind-driven rotor for converting wind energy to a mechanical driving force; a power converter for converting the driving force to exploitable power; and a drive train for rotatably transmitting the driving force from the wind-driven rotor to the power converter, the drive train comprising: at least one rotatable driving element configured to provide at least one torsional resonance frequency in the drive train, wherein the at least one rotatable driving element comprises a gearbox arranged between the wind-driven rotor and the power converter, wherein the gearbox includes at least a first stage and a second stage, wherein the first stage includes a first input shaft and a first output shaft, wherein the second stage includes a second input shaft and a second output shaft, and wherein the respective output shafts are configured to rotate at higher speeds than respective input shafts; a first detuner having at least one first mass element with a first mass inertia and at least one first elastic element with first elastic properties, the first mass element and the first elastic element being arranged to rotate during operation of the wind turbine, wherein the torsional resonance frequency is influenced by the first mass inertia and the first elastic properties, wherein the first detuner is arranged at an output shaft of a final one of the stages of the gearbox; and a second detuner having at least one second mass element with a second mass inertia and at least one second elastic element with second elastic properties, the second mass element and the second elastic element being arranged to rotate during operation of the wind turbine, wherein the torsional resonance frequency is further influenced by the second mass inertia and the second elastic properties, and wherein the second detuner is arranged at an output shaft between two of the stages of the gearbox, wherein the first and second detuners are tuned for first and second frequencies, one of the first and second frequencies being lower than an operating frequency giving rise to tonality to be attenuated, and the other of the first and second frequencies being higher than the operating frequency.