Up-Tower Investigation of Main Bearing Cage Slip and Loads

Roger Bergua Archeli, Jon Keller, Olle Bankestrom, Mark Dunn, Yi Guo, Alicia Key, Emma Young

Research output: NRELTechnical Report


This paper described the operational conditions of an SRB in the main bearing position of a three-point mount wind turbine drivetrain. A commercial wind turbine was instrumented to measure load characteristics on the outer ring of the bearing, which were used to examine the roller load characteristics qualitatively and the cage slip quantitatively in a range of operational states. Further, a simple analytic model estimated the bearing loads and was used as input conditions to a three-dimensional finite element model. The finite element roller load results were compared to the measurements and contact stresses were also described.
Original languageAmerican English
Number of pages29
StatePublished - 2021

NREL Publication Number

  • NREL/TP-5000-81240


  • load
  • main bearing
  • reliability
  • sliding
  • strain


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