压电陶瓷驱动器动态驱动电源设计

针对大位移压电陶瓷驱动器的特点,设计了一种可动态应用的驱动电源,并给出了详细的电路原理图.对驱动电源的性能试验表明,在输入为正弦波、三角波和方波等动态信号时,该驱动电源可以很好的跟随输入信号的变化,显示出优异的动态性能.对压电陶瓷驱动器的驱动试验表明,该驱动电源具有较强的带负载能力,可满足大位移压电陶瓷驱动器的动态驱动...     

压电驱动器驱动电源设计

针对提高电源的输出质量、容性负载的响应速度等设计要求,设计了一种基于PA78的电压控制型压电陶瓷驱动电源。从理论角度研究了电压控制型驱动电源特点并初步制定了设计方案,以PA78高压功放作为核心器件,对驱动电源的核心电路、直流稳压电路及放电回路等进行设计。在此基础上,对驱动电源电路的稳定性、频响特性等关键性能进行研究。最后搭建了驱动电源测试系统,在容性负载情况下,对驱动电源的线性度、纹波电压等基本性能进行测试和分析,实验结果表明所设计的驱动电源满足设计要求。     

行走式尺蠖压电直线驱动器研究现状及关键技术综述

尺蠖压电驱动器具有大行程、高精度、大输出力、快速响应、无磁场影响等优点,在超精密定位领域具有广泛的应用前景。而行走式尺蠖压电驱动器又以箝位机构结构简单、刚度和动态性能好,中间驱动机构偏摆小,整体体积小,运动稳定性好等特性引起世界各国的关注。在阐述行走式尺蠖压电驱动器的本质、组成结构及运动原理的基础上,对其国内外研究现状及其关键技术进行了分析,并对其发展趋势进行了展望。     

高精度压电陶瓷相移器设计

文中采用压电陶瓷柱和自行设计的0-300V直流可调电源制作高精度压电陶瓷相移器,并由计算机通过D/A转换板输出电压进行控制,采用CCD组成闭环反馈.经过标定,相移器的相位误差在±3°之内.该相移器的使用提高光学无损检测的测量精度,而且经济性很好.     

基于开关电源的蠕动式压电驱动电源研究

研制了一台被动箝位蠕动式直线压电驱动器专用驱动电源。电源电路主要由信号发生电路、升压电路和斩波电路组成。信号发生电路采用51单片机作为核心元件,实现3路频率可调的控制信号。升压电路基于反激式开关电源的工作原理将低压直流转换为高压直流,实现输出电压的连续调节。斩波电路采用半桥斩波的方法将升压电路的输出电压进行斩波,产生驱动器控制电压,实现驱动器的运动控制。     

一种新型的压电陶瓷驱动电源研究

为了满足压电陶瓷对驱动电源纹波小的要求,基于两路交错并联电源电路的研究,提出了四路交错并联boost 驱动电源电路的拓扑.四路交错并联boost驱动电源电路中的四条支路可减小输入电流纹波,同时还可减小输出电压纹波,可满足压电陶瓷对驱动电源高稳定性、低纹波、高效率的要求.分析了四路交错并联boost电源电路的基本原理,通...     

基于Buck电路的高压压电陶瓷驱动电源设计

研究设计一款基于Buck电路的高压大电流压电陶瓷驱动电源。介绍了该驱动电源的设计方案、主要功能、硬件电路、控制软件以及实验结果。该驱动电源通过Buck并联电路,电流反馈调节输出电压电流。输入信号经巴特沃斯滤波器进行最大限度还原,通过归一化算法将计算结果写回寄存器控制电路。当等效电容5μF压电陶瓷为负载时,在5 Hz～2 kHz正弦信号输入,直流电压1 kV输入条件下,该驱动电源输出驱动电压峰值最高为900 V,输出电流峰值最大为6 A,并且增益可变。实验结果表明,该驱动电源具有高电压大电流的驱动性能,动态性能良好,转换效率高达90%以上,满足压电陶瓷驱动电源的要求。     

尺蠖型压电直线电动机制作及性能测试

为了实现机械元件的高精密驱动,设计和研究了一种应用自然界中尺蠖原理的压电驱动直线电动机,完成压电直线电动机的样机制作并对其进行了试验测试。试验结果表明,制作和测试的尺蠖型压电直线电动机工作行程20 mm,最大驱动力38 N,在驱动电压200 V时,具有最大的运动步长35.15μm,步长稳定性误差小于3%,在驱动电压为10 V时,实现最小的运动步长20 nm。电机在无负载状态,驱动频率30 Hz,驱动电压200 V时达到的最大驱动速度484.2μm/s。该电机具备良好的工作性能,在精密驱动领域具有广泛的应用前景。     

基于压电驱动技术的细胞微量注射装置

提出了用压电陶瓷在通电下产生的微小变形的原理来设计压电驱动器,利用微位移压电驱动器来完成细胞微量注射微动平台的定位和注射,并且将微动平台和由电机带动的细胞微载台来构成细胞药物微量注射的机械结构与控制系统。压电式细胞微量注射装置的定位和注射动作全部由压电驱动器来完成,和目前国内外的细胞微量注射装置相比主要特点是定位精度和注射精度都比较高。     

基于虚拟仪器的压电陶瓷线性化研究

本文根据压电陶瓷的非线性特性,提出了一种采用离散电压点线性化压电陶瓷的方法。利用数模输出卡,输出不同步长的单个的离散电压,控制电陶瓷伸长的速度,从而达到利用选取的电压值参数来控制压电陶瓷伸长速度的目的。选取恰当的电压值,可以使得压电陶瓷在时间域上线性的伸长而达到线性化的。设计基于LabVIEW的控制系统,并对线性化方法进行了原理分析和实验。实验结果表明,该系统可以有效的在0~300V范围内使压电陶瓷的伸长量与时间成线性关系,定位精度为1nm。     

用于大范围纳米级压电微动台的驱动控制系统

介绍了一种基于尺蠖运动原理大范围纳米级步距压电微动工作台。根据其运动原理特点,设计完成了该压电微动台的控制系统。在电压控制下,利用压电陶瓷的逆压电效应,通过机械装置将压电陶瓷的微小位移输出,达到精密定位的目的。最后对该控制系统进行了性能测试。实验表明,该控制系统所产生的三角波、方波信号纹波电压小,信号稳定,其中放大电路部分放大倍数为57,能够驱动所选用的压电陶瓷,满足微动台驱动要求。     

提高蠕动式压电直线驱动器输出力的研究进展

蠕动式压电直线驱动器具有大位移行程和高位移分辨率的特点,但是箝位机构利用静摩擦力输出负载的方式大大限制了系统的进给刚度和输出推力.从箝位机构的结构类型、运动方式以及和新材料新技术的交叉应用等方面,介绍了几种典型尺蠖驱动器的研究进展,为提高系统的输出力,指出了今后的研究方向.     

Hysteresis nonlinearity compensator for piezoelectric actuator

The purpose of this paper is to improve the hysteresis characteristics of a stack type piezoelectric actuator using the hysteresis nonlinearity compensator. Recently, several printing methods that cost less and are faster than previous semiconductor processes have been developed for the production of electric paper and RFID. The system proposed in this study prints by spraying the molten metal, and consists of a nozzle, heating furnace, operating actuator, and an XYZ 3-axis stage. As an operating system, the piezoelectric (PZT) method has very valuable uses. However, the PZT actuator has a hysteresis nonlinearity due to the ferroelectric characteristics of the PZT element. This causes problems in the system position control characteristics and deteriorates the performance of the system. This study proposed an inverse hysteresis model, a mathematic modeling method that can express the geometric relationship between voltage and displacement, in order to reduce the hysteresis of the PZT actuator. In addition, system identification and PID control methods were examined. Also, it was confirmed that the proposed control strategy gives good tracking performance.     

Analysis of primary-on-slider ultrasonic piezoelectric actuators and experiments on multidegree of motion freedom plane actuator

Recently, various machines and tools have been miniaturized, and with this trend, the size of an actuator becomes a very important factor. An ultrasonic actuator is different from other actuators using electromagnet force in the driving principle. The structures of an ultrasonic piezoelectric actuator is simple. An ultrasonic actuator converts the ultrasonic mechanical energy to mechanical thrust force by a friction force. Based on this idea, various ultrasonic actuators have been proposed and experimentally constructed. In this paper, the basic characteristics of a piezoelectric actuator are analyzed theoretically. The relationship between the thrust force and the weight force is clarified and verified by experiments. Various prototypes of plane ultrasonic piezoelectric actuators are constructed experimentally, and the fundamental characteristics are measured.     

Investigation of omnidirectional piezoelectric actuator

A study of a novel design composite piezoelectric actuator for omnidirectional object positioning is given in the paper. The actuator consists of a vibrating disc with a small cylinder mounted at the centre and a piezoceramic disc. The cylinder magnifies resonant bending vibrations of the vibrating disc and transmits driving force to the slider. Electrodes of the piezoceramic disc cover all the surface of the bottom and are divided into four equal sectors. 2D motion and rotation of the slider is achieved depending on the excitation scheme of the electrodes. Numerical modeling based on the finite element method was performed to obtain resonance frequencies and modal shapes of the actuator and to calculate the trajectories of contact point’s movements under different excitation schemes of the electrodes. A prototype actuator was made and experimental outcomes of the oscillations of the working surfaces are given. Results of the numerical and experimental investigations are analyzed and discussed.     

A 2-dimensional impact driven precise actuator using piezoelectric bimorphs

A new precise actuator is proposed, which is actuated by the impact force of an end-loaded piezoelectric bimorph cantilever, and bears two degrees of freedom for translation and rotation. The dynamic characteristics of the piezoelectric bimorph were analyzed by FEM, and are further proved by experimental tests. A new control system for the actuator was put forward and tested, which is called the fixed-frequency with adjustable voltage. In addition, the actuator’s performance of translation and rotation were both measured. The results demonstrate that the actuator is characterized by a simple structure, large movement range, strong driving ability and high positioning resolution. Its cost is estimated at only 1% of the traditional impact actuators. __________ Translated from Journal of Jilin University (Engineering and Technology Edition), 2006, 36(1): 67–71 (in Chinese)