轴/径向耦合式球转子非接触式压电作动器的研究

本文提出了一种基于逆压电效应的轴/径向耦合式球转子非接触式压电作动器，由轴向悬浮装置及径向悬浮装置组成，且两者均可形成行波，为球转子提供悬浮力和驱动力。由于轴向悬浮装置和径向悬浮装置的工作模式可进行不同组合，使得被诱发出的声场具有不同耦合强度的悬浮和旋转驱动力，进而球转子可获得不同的悬浮和转速效果，易于对球转子进行状态控制。建立了轴向悬浮装置及径向悬浮装置的有限元模型，对定子进行了动力学分析与设计，确定了结构方案，并加工、制造了样机。通过试验得到了定子的振动参数、轴向悬浮装置的悬浮及驱动特性，结果表明轴向悬浮装置可成功的悬浮和驱动球转子。

Study on the Axial/Radial Coupling Non-contact Piezoeletric Ultrasonic Motor with a Spherical Rotor

In this paper, the axial/radial coupling non-contact piezoelectric ultrasonic motor with a spherical rotor based on inverse piezoelectric effect is proposed. It is made up of an axial suspension device and a radial suspension device, both of them can form a travelling wave, which provides levitation force and driving force for the spherical rotor. As the axial and radial levitation device have different working mode combination, which makes the induced sound field have different coupling strength of levitation and rotary driving force. Then, the spherical rotor can acquire different levitation effect and rotary speeds; it is easy to get control of the state of the spherical rotor. In this article the finite element model of the axial and the radial levitation device are built and the dynamics analysis is conducted. The prototype is manufactured and the stator vibration parameters, levitation and driving characteristics of the axial levitation device are obtained by test. The experimental results primarily show that the axial levitation device successfully levitates and drives the spherical rotor.