环形行波超声波电机动态接触摩擦特性建模与分析  

Modeling and Analysis on Dynamic Contact and Friction Characteristics of Ring Type Traveling Wave Ultrasonic Motors

作　　者：蒋春容[1] 赵子龙 陆旦宏[1] 金龙[2] Jiang Chunrong;Zhao Zilong;Lu Danhong;Jin Long(School of Electric Power Engineering Nanjing Institute of Technology,Nanjing 211167 China;School of Electrical Engineering Southeast University,Nanjing 210096 China)

机构地区：[1]南京工程学院电力工程学院,南京211167 [2]东南大学电气工程学院,南京210096

出　　处：《电工技术学报》2023年第8期2036-2047,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51777029);江苏省“六大人才高峰”高层次人才项目(KTHY-040);南京工程学院校级科研基金项目(CKJB202103)资助。

摘　　要：超声波电机的接触摩擦模型对电机结构设计和性能优化具有重要作用。该文考虑定子齿结构,基于Dahl摩擦这一动态摩擦定律,分析了定子振动的瞬态响应过程、定子齿质点与转子的法向接触和切向摩擦及转子运动方程,建立了环形行波超声波电机定转子动态接触摩擦解析模型。基于所建立的模型,研究了定转子间的接触状态和法向接触应力,以及相对速度和切向摩擦应力,并分析了电机的输出性能。最后,测量了样机的输出特性,将测量值与所建立模型的计算值进行比较,二者基本吻合。此外,也对比了忽略定子齿结构并采用库仑摩擦定律的接触摩擦模型的计算值,结果表明,所建立模型的计算值能更好地与实验值相吻合,说明所建立的模型能够更准确地描述定转子接触摩擦传动特性。The contact and friction model plays an important role in structure design and performance optimization of ultrasonic motors.Studies on the contact and friction problem of ring type traveling wave ultrasonic motors have been widely reported,and different contact models have been proposed.However,due to the complicated contact and friction mechanism on the contact surface,the stator teeth have been ignored by assuming teeth surface to be continuous in previous models,which is inconsistent with the actual contact situation.On the other hand,the majority of existing contact models of traveling wave ultrasonic motors are derived by using Coulomb friction law.The Coulomb friction,which is a typical static friction model,usually describes the steady-state behavior of friction force.However,the relative velocity of the stator and rotor in traveling wave ultrasonic motors changes all the time even when the motor runs to steady state.In this case,dynamic friction models such as Dahl friction are more accurate than Coulomb friction during dynamic analysis.To address these issues,a dynamic contact and friction model of ring type traveling wave ultrasonic motors is proposed by taking stator teeth into account and meanwhile adopting Dahl friction law to describe the dynamic friction drive mechanism on the contact surface.Firstly,the transient response of the stator vibration when the motor is energized is simulated with finite element software ANSYS.The numerical result of stator vibration amplitude is extracted and fitted with a polynomial in order to obtain the stator vibration model in analytical form.Secondly,normal contact between the stator teeth and rotor under preload force is modeled with analytical method.The dynamic contact pressures at both transient and steady state operation of the stator are analyzed.Thirdly,tangential friction mechanism on the contact surface is modeled by using Dahl friction law.The dynamic tangential friction stress is investigated.Finally,the stator vibration model,the normal contact model

关 键 词：超声波电机 行波 接触 摩擦 定子齿 输出特性 

分 类 号：TM35[电气工程—电机]