Articles | Volume 3, issue 1
Wind Energ. Sci., 3, 97–105, 2018
Wind Energ. Sci., 3, 97–105, 2018

Research article 14 Mar 2018

Research article | 14 Mar 2018

Friction torque of wind-turbine pitch bearings – comparison of experimental results with available models

Matthias Stammler et al.

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Cited articles

Baly, H.: Reibung fettgeschmierter Wälzlager, PhD-Thesis, IMKT, Leibniz Universität Hannover, Hannover, 2005. 
Burton, T.: Wind energy handbook, 2nd Edn., Wiley, Chichester, New York, 2011. 
Daidie, A., Chaib, Z., and Ghosn, A.: 3D Simplified Finite Elements Analysis of Load and Contact Angle in a Slewing Ball Bearing, J. Mech. Design, 130, 8 pp., 2008. 
Dowson, D. and Hamrock, B. J.: Isothermal Elastohydrodynamic Lubrication of point Contacts: Part III: Fully flooded results, J. Lubr. Technol., 99, 264–276, 1977. 
FVA: Wälzlagerreibung Fettschmierung: Reibung fettgeschmierter Wälzlager, Forschungsvorhaben 388/I, Frankfurt, 2005. 
Short summary
Modern wind turbines all share the ability to turn (pitch) the blades around their main axis. By pitching the blades, the aerodynamic forces created by the blades are controlled. Rolling bearings, consisting of two steel rings and balls that roll on raceways between them, are used to allow pitching. To design pitch drives, it is necessary to know the losses within the bearings. This article describes how such losses have been measured and compares them with calculation models.