关键词: 直驱风力发电机轴承, 数值计算, 非线性弹簧接触模型, 接触应力, 摩擦力矩

Abstract: For the bearing of high-power direct-driven wind power generator, the finite element model based on full entity element contains a large number of nonlinear roller/raceway contact, which makes the calculation difficult to converge. In order to simplify the calculation model, a feasible way is to use nonlinear spring element to simulate roller/raceway contact. According to the finite length line contact model, the roller/raceway contact stiffness curve was obtained by numerical calculation method. Based on the stiffness curve, the nonlinear unidirectional compression spring element was used to simulate the roller/raceway contact, and the overall calculation model of the direct-driven wind power generator shaft system was constructed.The load distribution and contact stress of the bearing under the ultimate load were obtained. The results show that the simulation model based on this method is effective. Application of the proposed model to other complex bearing analysis can be expected.

Key words: bearing of direct drive wind turbine, numerical calculation, nonlinear spring contact model, contact stress, friction torque