基于PZT扭振模式的纵-弯耦合模态驻波型直线超声波电机  

Linear ultrasonic motor based on longitudinal-bending coupled modal standing wave excited by the shear vibration mode of PZT ceramics

作　　者：陆旦宏[1] 林秋香 徐健乔 蒋春容[1] 孙芮 LU Danhong;LIN Qiuxiang;XU Jianqiao;JIANG Chunrong;SUN Rui(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211100,China)

机构地区：[1]南京工程学院电力工程学院,南京211100

出　　处：《振动与冲击》2021年第22期121-127,187,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51507076);江苏省“六大人才高峰”高层次人才项目(KTHY-040);江苏省配电网智能技术与装备协同创新中心开放基金(XTCX202008)。

摘　　要：基于耦合振动理论设计出一种新型偏心式结构的驻波型直线超声波电机,其工作模态为包含一阶纵振成分与二阶弯振成分的耦合振动模态。与纵振和弯振的复合振动模态不同的是,该研究所设计超声波电机的工作模态通过构造定子的质心偏移条件,将这两种振型成分耦合,形成定子的耦合模态。其中,二阶弯振成分由金属弹性体两端压电陶瓷(piezoelectric ceramics,PZT)的扭振模式(d_(15)模式)激励产生,一阶纵振成分通过耦合同时产生。设计了工作于d_(15)模式的压电陶瓷的极化以及电源激励方案,详细阐述了电机的工作原理。利用有限元分析软件对定子的结构尺寸进行了设计,并对定子进行瞬态分析以得到各驱动足的运动轨迹。制作电机的试验样机并搭建试验平台,测试了样机的频率特性、电压特性以及机械特性。Based on the coupled vibration theory,a novel standing wave linear ultrasonic motor with eccentric structure was designed.Its working mode was a coupled vibration mode including the first longitudinal vibration component and the second bending vibration component.Different from the conventional composite mode of longitudinal vibration mode and bending vibration mode,the working mode of the linear ultrasonic motor designed in the paper coupled the two vibration components into a coupled mode of the stator by constructing the condition of centroid deviation of the stator.The second bending vibration component of the stator was excited by the d_(15) mode of piezoelectric ceramics(PZT)ceramics at two ends of the elastomer,and the first longitudinal vibration component was simultaneously generated by coupling.The polarization of PZT ceramics working in d_(15) mode and the power supply excitation scheme were designed.The working principle of the motor was described in detail.The structural parameters of the stator were designed by ANSYS,and the transient analysis of the stator was carried out to obtain the trajectories of driving feet.A prototype was made,and an experimental system was established to test the frequency characteristics,voltage characteristics and mechanical characteristics.

关 键 词：直线型超声波电机 耦合模态 d_(15)模式 

分 类 号：TM383[电气工程—电机]