Abstract
We evaluated the performance and fatigue life of a pitch bearing for multi-megawatt wind turbine. The test pitch bearing was a fourpoint contact ball bearing of internal-gear type designed to meet all specifications required for wind turbine pitch bearings. The tests used a test rig capable of reproducing the operational environment of pitch bearings, and the test items were selected on the basis of the actual operational conditions of the pitch bearing: a performance test to investigate friction torque and stiffness characteristics under extreme loads, and a fatigue life test to investigate friction torque and raceway surface temperature characteristics under fatigue loads.
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