非接触式球形转子压电作动器驱动器技术

为了解决非接触式超声电机的近声场驱动问题,提出利用有限差分法求解转子转速的方法.首先,设计出一种新型的非接触式球形转子压电作动器,根据其结构建立数学模型,对定转子之间的挤压膜中气体的控制方程进行简化;然后,利用有限差分法对挤压膜和转子的耦合控制方程进行离散并求解出转子随时间的转速变化曲线和稳定后的压力振型;最后,加工出作动器样机并建立实验系统,得出的实验数据与理论计算数据一致.本研究工作对在非接触式超声电机中如何提高转子转速提供了理论分析的方法和途径.

Driving Technologies of Piezoelectric Actuator with Non-contact Spherical Rotor

A new approach to solve driving problems of non-contact motors in near-field acoustic levitation is presented.First,a novel piezoelectric actuator with non-contact spherical rotor is designed.Based on the structure of this actuator,the mathematical model is set up and the control equations of gas in the clearance between the stator and rotor(squeeze film) are simplified.Then,these equations,together with the control equation of rotor,are solved by using finite difference methods,and the vibration mode of pressure at stable time and revolving speed with time are evaluated.At last,a prototype of the actuator is manufactured and an experiment system is built.The experimental data agree with that of analysis results.This work will provide theoretical analysis methods of increasing revolving speed with studying on non-contact ultrasonic motors.