超声波电动机输出性能的模拟分析

Simulation Analysis on Output Performance of Ultrasonic Motor

考虑定子弹性体的接触变形和摩擦驱动过程中的轴向及周向阻尼,以赫兹接触理论和库伦模型为基础,采用Simulink模块化方法建立超声波电动机接触界面的解析模型。以柔性转子和刚性定子构成的USM60电机为例,分析了预压力和压电激励频率对超声波电动机机械特性的影响。结果表明,预压力及其引起的定子弹性变形对超声波电动机的机械特性影响明显。当增大预压力时,电机转速和输出扭矩均有增大,但各自增幅有所差异。另外,在既定的算例中,压电激励频率对输出特性近似成正线性比例的影响。

Traveling wave ultrasonic motors are driven by uniform tangential forces within the interface between stator and rotor. The contact mechanism of motor depended upon the magnitude of mechanical inputs and material performances of the friction layer and stator, which determine the operating characteristics. Mostly, the output parameters are critical problem for the functional held life and engineering application of ultrasonic motors. The numerical analysis on output performance of ultrasonic motor（USM60） based on Simnlink model was constructed,considering the geometrical deformation of the stator by preloading with contribution to output performances. Numerical results show that the rotational speed and torque change linearly with the changing of preload in the normal direction, and the initial elastic deformation must not be disregarded, driving frequency of input power is positive to enlarge the output behaviors and then enhance the working efficiency of ultra-sonic motor.