等间距螺旋电极压电驱动器制备与静态性能测试

基于阿基米德螺线方程提出一种等间距螺旋电极压电驱动器,该文分析了其电极结构与驱动原理,采用丝网印刷法对该驱动器螺旋电极进行了印制,并完成待测元件的制备。搭建了位移测试平台测试元件的静态性能,并对其静态的径向位移及平面扭转角进行了研究。试验结果表明,直径?25 mm、厚2 mm、电极宽0.6 mm、电极中心距1.2 mm的等间距螺旋电极压电驱动器在频率0.5 Hz、电压200 V的正弦激励信号作用下,径向峰值位移可达1.02μm,为传统电极压电元件的1.57倍,扭转角度可达0.12 mrad,与传统型压电驱动器相比,该元件具有较大的径向位移输出,且产生的扭转角度明显。     

局部环形电极压电驱动器正交异性分析

该文提出了一种平面内具有正交异性的局部环形电极压电驱动器,研究了该压电驱动器的分支电极中心距、分支电极宽度和电极区域角对压电驱动器正交异性的影响。研究结果表明,局部环形电极压电驱动器的方向性强,在平面内有明显的正交异性。减小分支电极中心距、增大分支电极宽度及电极区域角,有利于提高该压电驱动器有电极区域的驱动性能。当电极中心距为0. 8 mm,电极度为0.4 mm,元件厚为0.5 mm,加载电压为200 V时,局部环形电极压电驱动器的径向夹持应力横向效应系数能达45.60,径向自由应变横向效应系数能达1.82。局部环形电极压电驱动器有电极区域的径向夹持应力可达2.46 kPa,径向自由应变可达6.3×10~(-5)。因此,局部环形电极压电驱动器在指定方向上可实现高的力学性能。     

环形电极压电驱动器极化电压和力学性能分析

提出一种新型环形电极压电驱动器,运用ABAQUS软件对此驱动器进行电场和力学分析。着重研究环形电极分支中心距和电极宽度对极化电压和驱动性能的影响,并与普通形电极压电驱动器的极化电压和驱动性能对比。结果表明,环形电极压电驱动器的极化电压为普通形电极的1/2,环形电极结构降低压电驱动器对极化电压的要求;减小电极分支中心距、增大电极宽度,有利于降低环形电极压电驱动器的极化电压;当工作电压为90 V时,环形电极压电驱动器的径向夹持力达到普通形电极的5.2倍,径向自由位移达到普通形电极的2.6倍。     

大位移交叉环形电极压电驱动器结构优化

设计一种交叉环形电极与压电圆盘驱动器相结合的交叉环形电极（CREs）压电圆盘驱动器,利用分析软件ABAQUS进行静力学分析,着重研究CREs型压电圆盘驱动器电极结构几何尺寸以及驱动器厚度对驱动器径向驱动性能的影响。研究结果表明,减小电极中心距与驱动器厚度,有利于提高驱动器的驱动性能;加载相同电压,CREs型压电圆盘驱动器的径向夹持应力能达到普通型的2.1倍,径向自由应变能达到普通型的3.4倍。CREs型压电圆盘驱动器性能研究为CREs型压电圆盘驱动器的设计制造提供了一定的理论依据。     

螺旋电极压电扭转驱动器的设计与有限元分析

该文设计了一种新型叉指型电极（IDE）结构形式的螺旋电极压电扭转驱动器,推导并建立了螺旋电极平面有效电极区域内点的应变理论方程。利用ABAQUS对该理论方程进行验证,并着重研究了电压、径向尺寸、圆盘厚度对该压电驱动器应变的影响。结果表明,螺旋电极压电扭转驱动器能够产生较大的切向应变和径向应变输出;增大电压,减小压电圆盘径向尺寸和压电圆盘厚度,有利于提高驱动器的驱动性能;在螺旋角、压电圆盘径向尺寸和电压一定时,螺旋电极压电扭转驱动器的切向应变达到普通电极型的17.5倍,径向应变是普通电极型的16倍。     

压电双晶片阵列式直线驱动器的设计与研究

基于压电双晶片提出一种新型准静态直线压电驱动器,可通过阵列的方式获得所需机械输出力,结构简单,性能稳定,可控性强。利用有限元软件对驱动器结构进行设计与分析,并加工制造了该驱动器的物理样机。最后通过实验发现,当驱动频率为500~2 100Hz时,驱动器可直接输出直线运动。当驱动频率为1 100Hz,驱动电压峰-峰值为200V,预紧力为1.5N时,该驱动器最大输出速度可达95mm/s,最大输出力为0.7N。     

叉指形电极压电驱动器性能分析

分析了叉指形电极压电驱动器的结构特点和电场结构。给出了压电驱动器的本构方程,建立了叉指形电极压电驱动器的有限元模型,研究了指形电极关键尺寸和压电片厚度尺寸对驱动器应力、应变的影响,对比分析了普通电极压电驱动器的应力和应变性能。研究结果表明:叉指形电极压电驱动器比普通电极压电驱动器驱动应力大,最大可以高达5倍;具有明显的正交异性,横向效应系数为–2.16;减小电极中心距和压电片厚度能提高驱动器性能。     

端部双触点型压电驱动器

设计并制作了一种基于矩形块状压电陶瓷一阶纵振和二阶弯振模态耦合的直线型压电驱动器。该压电驱动器在矩形块状压电陶瓷的2个端部均布置1个氧化铝陶瓷触点,2个触点交替工作,提高了矩形块状压电陶瓷振子的振动利用率。采用有限元与实验结合的方法设计并优化了驱动器的结构尺寸。并通过实验发现,在电压峰-峰值600V下,该驱动器的最大空载速度为250mm/s,最大输出力为16N。最后,对驱动器中板簧发热问题进行了讨论和分析得出,板簧在设计时应尽可能远离驱动器的工作频率,否则会使板簧共振发热,影响驱动器的寿命,严重时将损坏驱动器内部结构。     

两级位移放大微夹持器的研究

微夹持器是完成微操作、微装配作业任务的重要工具,其体积、质量、张合量、微夹持力等是微夹持器设计过程中的重要指标。利用压电陶瓷作为微驱动元件设计了一种具有两级位移放大的微夹持器,并采用有限元软件对其进行张合量、微夹持力的分析。经实验测试,验证了所设计的微夹持器的合理性和实用性。     

叉指形电极管状压电元件电极制备与极化研究

该文制备了PZT-52压电陶瓷柱,采用丝网印刷法在压电陶瓷基体表面附着电极,研究了管状陶瓷表面电极的印刷工艺流程。利用油浴热极化法对元件进行极化实验,通过对元件自由位移的检测,研究了极化时间对压电驱动器位移的影响,分析了极化时间对电畴转向和银电极成型质量的影响原理。结果表明,随着极化时间的增加轴向驱动位移逐渐增强,在极化电压为500 V,极化温度为110 ℃,极化时间为60 min时,叉指形电极管状压电元件最大轴向位移为0.30 μm。     

Analysis of primary-on-slider type piezoelectric actuator and theapplication to two-degree-of-motion freedom plane actuator

The basic characteristics of a primary-on-slider type piezoelectric actuator were theoretically analyzed, and the relationship between the thrust force and the weight force was clarified, and was verified by the experiments. As a result, when the weight force was imposed on the slider, the thrust force increased, but when too heavy a weight force was applied, the thrust force decreased. Various prototypes of two-degree-of-motion freedom plane ultrasonic piezoelectric actuators were experimentally constructed, and the fundamental characteristics were measured. The vibration mode of actuators was also analyzed by ANSYS, and compared with the experimental results. The characteristics of the plane ultrasonic piezoelectric actuators were obtained similar to the theoretical characteristics. Since the shape of this plane ultrasonic piezoelectric actuator is very simple, it is suitable for applications that complicated motions are required in limited space     

基于双压电执行器的高频响伺服刀架实现研究

目前应用压电执行器的快速伺服刀架只能提供单向的驱动力,回复时间长,据此提出了一种双压电执行器构造的高频响伺服刀架。采用经典PI迟滞模型和其逆模型分别对2个压电执行器进行建模,在此基础上实现2个执行器的联动控制。为了提高控制精度,对经典PI模型进行改进,使其具有动态和非对称性。有限元软件分析得到该刀架的响应速度为10.21mm/s。最后实验结果表明刀架的响应速度为9.62mm/s。     

A hybrid inchworm linear motor

A hybrid linear motor that produces precise resolution with long travelling distance under inchworm motion principle is developed. The motor consists of one push and two clamping devices. The clamping device is innovated using multistack piezoelectric actuators with displacement amplifier since the displacement generated from multistack actuator is not enough for clamping. To secure the large push load and displacement, Terfenol-D magnetostrictive material is used for the push device. Design process of the push and clamping devices is conducted to meet the performance of the motor. The clamping and push devices are assembled and a control sequence is applied. The performance of the inchworm motor is tested in terms of speed and force. The moving speed is increasing when the input frequency and current are increased. To make the performance stable, time tuning between the push and clamping devices signals is necessary. Some remarks on improving the performance of the motor are addressed.     

PBP压电双晶片驱动器力学特性研究

为了获得后屈曲预压缩 （PBP）驱动器的力学特性,该文通过解析模型、有限元模型及实验验证对其进行了研究,3种结果符合较好。结果表明,PBP驱动器可达到10°的输出转角峰 峰值,3倍于施加同样电压的普通压电双晶片,设计空间增大。其一截频率达到178 Hz,远高于普通微小型电动伺服舵机。该文可为PBP舵机驱动器原理样机的研制提供理论基础和实验方法。     

Design considerations for complementary inchworm actuators

An inchworm actuator is described, which uses complementary configurations for the two clamping sections. In one configuration, clamping and release are achieved using high and low voltages, respectively, while for the other, clamping and release are achieved using low and high voltages, respectively. The resulting inchworm actuator can be driven by a two-channel controller with the two clamps sharing the first channel and the extender piezoelectric actuator using the second channel. The paper also describes a diode-shunted delay circuit that causes unclamping to occur more slowly than clamping. It is shown that by using the delay circuit in series with each clamp, the overall force drive capability of the actuator is increased. The paper presents simulated and experimental results of clamp force versus time during the switching transient. An analysis of a generalized delay circuit having both resistive and reactive elements shows that a purely resistive design provides the better tradeoff between increased force drive capability and power loss in the delay circuit.     

Micro–macro linear piezoelectric motor based on self-moving cell

This paper deals with the development of a piezoelectric linear motor that can control macro and micro movements. Concept of the motor is based on a self-moving cell, which consists of an elastic shell structure and a piezoelectric stack actuator. Three cells are connected in series and by activating piezoelectric actuators in these cells, macro movement can be achieved. Since these cells are fit into a guideway with interference, this motor can possess a high stall force and fail-safe lock. When one piezoelectric actuator is activated by open loop control with hysteresis compensation, micro movement can be obtained. Design of self-moving cell structure, fabrication, and control of the motor for macro and micro movements are explained. The maximum moving velocity of 1.05 mm/s and the maximum force of 4.3 N were observed. The possibility of nano scale movement was demonstrated by taking into account the hysteresis compensation of the piezoelectric actuator.