Calculation on Friction Torque of Blade Bearings Without Load Based on Finite Element Analysis

Based on finite element analysis,the calculation of friction torque is introduced for wind turbine blade bearings with balls preloaded under no-load,and the ideal value for friction torque ratio of bearings filled with single row and two rows of balls is studied.The results show that the ideal friction torque ratio of blade bearings without load is smaller than 2,approximate 1.3~1.4.