中文摘要：

针对摩擦材料粘贴在定子表面的设计问题，假设转子为刚性体，定子表面摩擦材料为粘弹性材料，提出一种新的行波型超声电动机粘弹性接触模型。在建模中，考虑接触层惯性的影响，引入定子接触层的切向和法向等效质量的概念，并修改接触区域的边界条件。应用牛顿力学定律，推导出接触界面的驱动方程。该模型不仅可以模拟分析定子和转子接触区的法向压力和切向速度分布，模拟计算超声电动机的负载特性和传动效率，而且还可以研究定子和转子接触界面参数对超声电动机输出特性的影响。基于所建立的接触模型，利用Mauab方法，模拟分析一种行波超声电动机的负载特性，并与试验结果进行了比较。结果表明，数值计算的电动机负载特性与试验结果基本一致，证实驱动模型的合理性。

英文摘要：

According to design problem of friction material stuck onto the stator surface, the rotor is assumed to be rigid body and the frictional material on stator surface to be visco-elastic material, a new visco-elastic contact model of traveling wave ultrasonic motor （TWUSM） is presented. In modeling, the influence of the inertia of frictional layer is considered, then two parameters, tangential and normal equivalent mass of the stator contact layer, are introduced, and the initial border term is revised. Newton＇s dynamics law is applied to build an interface drive model. By means of this model, not only the normal pressure and the tangential speed distribution of the contact zone, load characteristics and transmission efficiency of TWUSM can be simulated and analyzed, but also the effects of interface parameters between stator and rotor on out-put characteristic of TWUSM can be calculated numerically. Based on this contact model, load characteristic of TWUSM is simulated numerically by using MATLAB method, and the simulated result is compared with test result. It is shown that their load characteristics have good agreement, and then the rationality of driving model is testified.