摘要
为减小纵弯直线超声电机的模态间耦合效应,提高电机的控制性能和效率,研制了一种新构型的模态解耦型超声电机.该电机采用兰杰文换能器结构,压电陶瓷布置模式为:纵振压电陶瓷置于电机中部,弯振压电陶瓷置于电机纵弯振型的波腹处.利用有限元模态分析方法,通过调整结构参数对电机纵弯固有频率进行调谐使其趋于一致.对样机的阻抗特性分析和多普勒激光测振结果显示:纵弯模态间耦合程度明显降低,其典型机械输出特性中最大速度为920mm/s,最大推力为45N,指标优于在基本尺寸和激励条件相近前提下的非解耦构型的480mm/s和25N.
To reduce modal coupling effect of longitudinal and bending hybrid linear ultrasonic motor and improve the controllability and efficiency,a new modal decoupling motor is proposed and investigated.The motor contains a Langevin transducer configuration where longitudinal piezoceramics are positioned in the middle part of the motor,and the bending piezoceramics are positioned at longitudinal and bending antinodal plane.The longitudinal and bending natural frequencies are degenerated by adjusting structure parameters following FEM modal analysis,and the modal coupling reduces obviously in impedance analysis and laser vibrometer measurement.The typical output performances get the maximum as speed 920mm/s and thrust force 45N,which outperform 480mm/s and 25N of the previous motor.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2010年第8期101-105,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50875057)
关键词
超声电机
压电陶瓷
耦合效应
兰杰文换能器
ultrasonic motor
piezoceramic
coupling effect
Langevin transducer
