直线型超声波电机的研究
关键词 直线超声波电机 有限元 模态分析 谐响应分析
Title A Research on Linear Ultrasonic motor
Abstract
An ultrasonic linear motor is studied in this paper. The motor uses bending
and longitudinal vibrations coupling as a working mode, and the slider is
driven by two driving feet for linear motion. With the use of the inverse
piezoelectric effect of Piezoelectric ceramic, ultrasonic motor excites
stator vibration.
The principle of this ultrasonic motor is discussed and the necessary
excitation voltage and the conditions working mode needs to satisfy so as
to form the right elliptical motion at the driving feet is analyzed. By
establishing a model of stator in ANSYS software, the vibration mode of
stator is analyzed, and the appropriate mode and operating frequency is
selected. The harmonic response analysis is done, which determines the
stator structure is reasonable. In addition, a contact model of stator and
rotor is established, analysis shows that there is a great relationship
between the output of motor thrust and the fixed gap of stator and rotor.
Keywords Linear ultrasonic motor Finite element Modal analysis
Harmonic response analysis
目 次
1 引言 1
1．1 课题背景 . 1
1．2 超声波电机特点及应用 . 1
1．3 直线超声波电机研究现状 . 3
1．4 本课题的主要研究内容 . 4
2 弯纵复合直线超声波电机工作原理 5
2．1 压电陶瓷振动特性 . 5
2．2 弯纵复合直线超声波电机定子结构 . 5
2．3 弯纵复合直线超声波电机工作原理 . 6
2．4 本章小结 . 8
3 基于 ANSYS软件的定子模型 . 10
3．1 有限元分析原理 10
3．2 ANSYS 软件简介 . 10
3．3 定子模型建立 10
3．4 本章小结 12
4 定子振动分析 . 13
4．1 模态分析 13
4．2 谐响应分析 16
4．3 本章小结 20
5 定转子接触分析 . 22
5．1 定转子接触模型 22
5．2 最大推力计算 22
5．3 本章小结 23
结 论 25
致 谢 26
参 考 文 献 . 27
附 录 29 1 引言
1．1 课题背景
随着现代社会自动化水平的提高和人们探索世界的范围扩大，对电机的性能提出
了更高的要求。在这种情况下，超声波电机应运而生。相比于传统电机，超声波电机
具有体积小、低速大转矩、响应速度快、无电磁干扰等杰出优点。例如，超声波电机
采用定子和转子直接接触，靠摩擦驱动转子转动，并不像传统电机那样靠电磁场传递