Jiang Chunrong, Zhao Zilong, Lu Danhong, Xu Zhike, Jin Long
School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China.
School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China.
Ultrasonics. 2023 Jan;127:106851. doi: 10.1016/j.ultras.2022.106851. Epub 2022 Sep 21.
A surface contact model of ring type traveling wave ultrasonic motors is proposed in this paper in order to describe the circular three-dimensional contact and friction problem between the stator and rotor accurately. Differing from previous contact models of traveling wave ultrasonic motors, the flexibility of the rotor, which results in the irregular shape of contact area and inhomogeneous distribution of contact pressure along radial direction, is taken into account in the proposed model. The normal contact between the stator and rotor is analyzed with finite element method and the tangential force transmission on the contact surface is investigated with analytical method. The contact pressures and the tangential stresses on the contact surface are obtained. Mechanical performances of the motor are also studied based upon the proposed model. Finally, torque-speed curves of a prototype motor are measured and compared with the calculated results of the proposed model, and good agreements are obtained. In addition, the proposed surface contact model is compared with previous line contact models. It is found that the calculated results of the surface contact model are closer to measured results than those of line contact models. The comparison results verify the accuracy of the proposed surface contact model.
为了准确描述行波超声电机定子与转子之间的圆周三维接触和摩擦问题，本文提出了一种环形行波超声电机的表面接触模型。与先前的行波超声电机接触模型不同，该模型考虑了转子的柔性，这种柔性导致接触区域形状不规则以及接触压力沿径向分布不均匀。采用有限元法分析定子与转子之间的法向接触，并用解析法研究接触面上的切向力传递。得到了接触面上的接触压力和切向应力。基于所提出的模型还研究了电机的机械性能。最后，测量了一台原型电机的转矩 - 速度曲线，并与所提出模型的计算结果进行比较，得到了良好的一致性。此外，将所提出的表面接触模型与先前的线接触模型进行了比较。结果发现，表面接触模型的计算结果比线接触模型的计算结果更接近测量结果。比较结果验证了所提出表面接触模型的准确性。
