拉压负载下的大推力压电直线作动器  

Large-thrust piezoelectric linear actuator under tension and pressure load

作　　者：时运来[1] 程丁继 张军[1] 王富刚 SHI Yun-lai;CHENG Ding-ji;ZHANG Jun;WANG Fu-gang(State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,江苏南京210016

出　　处：《光学精密工程》2019年第4期832-841,共10页Optics and Precision Engineering

基　　金：南京航空航天大学研究生创新基地(实验室)开放基金资助项目(No.kfjj20170106);航空科学基金资助项目(No.2016ZA52014);江苏高校优势学科建设工程基金资助项目;工信部2017年智能制造综合标准化与新模式应用专项

摘　　要：为解决压电直线作动器在受到拉力和压力负载时的驱动问题,本文提出了一种双向压电直线作动器。该作动器主要采用双向螺旋箝位原理,实现双向大推力作动。结构上,将两个压电叠堆对称布局,梯形丝杠螺母组成螺旋箝位,匹配二者驱动时序实现压力和拉力下的驱动。为研究双向尺蠖驱动机理,设计了双向螺旋箝位机构和作动器总体结构;而螺旋箝位作为尺蠖驱动的关键因素,为了准确地表达箝位的可靠性,研究了力矩电机与柔性联轴器及压电叠堆的匹配关系,并通过ANSYS软件对箝位功能进行了仿真分析。设计加工的样机机身总长为233mm,最大外径为63mm,质量为1.1kg。搭建样机的测试系统,试验表明:该作动器的最大输出力可达190N,最高速度可达2.58mm/s,行程为60mm。A bidirectional piezoelectric linear actuator was proposed to solve the issue of the piezoelectric linear actuator being incapable of functioning under tension and pressure load. The actuator mainly adopted the principle of the two-way screw clamping to realize two-way large-thrust actuation. Structurally, the two piezoelectric stacks were symmetrically arranged, and the trapezoidal screw nut constituted a screw clamp. By matching the driving timing of the piezoelectric stack and screw clamp, the actuator could achieve driving under pressure and tension. To study the driving mechanism of the two-way inchworm, the bidirectional screw clamping mechanism and the overall structure of the actuator were designed. The screw clamp was the key factor in the driving of inchworm. To accurately express the reliability of the clamp, the matching relationship of the torque motor with the flexible coupling and piezoelectric stack was studied. The clamping function was simulated and analyzed by ANSYS software. The total length of the prototype is 233 mm. The maximum diameter is 63 mm, and the weight is 1.1 kg. An experimental test system of the prototype was built. According to the testing results, the maximum output force of the actuator can reach 190 N , while the maximum speed is 2.58 mm/s, with a stroke range of 60 mm.

关 键 词：压电直线作动 大推力 压电叠堆 螺旋箝位 尺蠖 

分 类 号：TM359.4[电气工程—电机]