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Improvements in the output power and accuracy of an ultrasonic stepping motor

超声波步进电机的输出功率和精度的改进

基本信息

批准号：
07650061
负责人：
NAKAMURA Kentaro
金额：
$ 1.54万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650061/
关键词：
Stepping Motor Ultrasonic Motor Standing Wave Nodal Circle Positioning Linear Motor たわみ振動

项目摘要

This study was focused on the improvements of an ultrasonic stepping motor for its practical use. In this motor, a stepping motion is realized by shifting spatially the standing vibrations of a ring/disk stator.1) To support the stator firmly, a bending vibration mode of a disk with a nodal circle was introduced. An appropriate stator configuration was designed by Finite-Element-Method and made. We succeeded in fix the stator without reduction in vibration characteristics.2) An experimental investigation on the contact mechanism at the rotor/stator interface revealed that the accuracy of step position becomes high when the width of contact region is designed at a quarter wavelength of the stator vibration.3) A motor with 4.5 degree-step was designed and made being based on these new knowledge.4) A high speed operation algorithm for accurate positioning was developed, where a large step high spped coarse positioning and a small step fine positioning were used complementarily.It was clarified that the accuracy of the electrode pattern and the dimensions of the stator should be improved for much higher precision. A design for higher vibration amplitude is also important for larger mechanical output5) A principle of linear stepping motor was also proposed. A reversible stepping motion of 10 steps for 50 mm span was realized by exciting several bending vibration of a bar with different order.

本研究主要针对超音波步进马达进行改良，使其能实用化。在该电机中，步进运动是通过空间移动的环/盘定子的驻波振动实现的。1）为了牢固地支撑定子，引入了具有节圆的盘的弯曲振动模式。采用有限元法设计并制造了合适的定子结构。2）对转子/定子界面接触机理的实验研究表明，当接触区宽度设计在定子振动的四分之一波长处时，步进位置的精度较高。3）基于这些新知识，设计并制造了4.5 °步进电机。4）提出了一种大步长高速粗定位与小步长精定位相结合的精确定位高速运算算法，并阐明了要提高定位精度，必须提高电极图形和定子尺寸的精度。5）提出了直线步进电机的工作原理。通过激励杆的多阶弯曲振动，实现了跨度为50 mm的10步可逆步进运动。