大位移压电陶瓷驱动器的设计与试验  

Design and experiment research on the actuators for large displacement

作　　者：崔艳梅[1] 刘向锋[1] 高志[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084

出　　处：《功能材料与器件学报》2007年第6期507-511,共5页Journal of Functional Materials and Devices

摘　　要：针对大位移压电陶瓷驱动器,研究了压电陶瓷双晶片的驱动效能。基于压电陶瓷材料的逆压电效应,应用压电陶瓷双晶片在机械自由、电学短路状态下,一片加正向电压缩短另一片加反向电压伸长共同作用产生弯曲变形,通过组合设计将压电陶瓷双晶片的弯曲变形位移叠加起来,实现了压电陶瓷驱动器的大位移输出。在相同电压的条件下,此压电陶瓷驱动器的输出位移量比叠层驱动器有较大的增加,达200μm,结构尺寸也大大减小。该驱动器不需要位移放大机构,可直接应用于有大位移要求的机构驱动。Characteristics of driving performance of piezoelectric bimorph were studied for large displacement piezoelectric actuator. Based on inverse piezoelectric effect of piezoceramics, bending distortion is produced when direct voltage was switched on one piece of piezoelectric bimorph which becomes shorter, and inverse voltage is switched on the other, which is lengthened, under the mechanic freedom and short circuit condition. Large displacement output of piezoelectric actuator is obtained by means of piling up bending distortion from combination of piezoelectric bimorphs. Experimental results show that the output displacement is 200 microns , which is larger than that of nappe actuators under the same voltage. The structural dimension is also greatly reduced. This kind of actuators can be used directly to produce large displacement without displacement amplifying mechanism.

关 键 词：压电效应 压电陶瓷双晶片 驱动器 

分 类 号：TH7[机械工程—仪器科学与技术] TN4[机械工程—精密仪器及机械]