直线超声电机的研究与应用现状

概述了直线超声电机的运动机理、分类方法及其不同于传统电磁电机的特点,叙述了国内外直线超声电机的发展及研究现状,总结了国内外直线超声电机的应用领域和前景。     

直线超声电机的研究与应用现状

概述了直线超声电机的运动机理、分类方法及其不同于传统电磁电机的特点,叙述了国内外直线超声电机的发展及研究现状,总结了国内外直线超声电机的应用领域和前景。     

对发展我国超声电机技术的若干建议

该文简要叙述了超声电机技术发展的国内外概况,重点介绍了南京航空航天大学超声电机研究中心为发展我国超声电机技术所作的努力.针对我国超声电机技术研究的现状,作者提出加速发展我国超声电机技术的若干建议.     

超声电机机电耦合系统建模方法综述

有关超声电机的建模、性能预估等理论问题的研究起步较晚 ,至今尚不完善和成熟。文中以旋转行波型超声电机为主线 ,在阐述超声电机机电耦合系统构成的基础上 ,比较全面地综述了国内外超声电机的建模方法 ,为进一步研究超声电机提供参考。     

基于模糊神经网络的超声电机的位置控制

超声电机的优良特性使其得到越来越广泛的应用,但由于其时变和非线性特性,使电机的速度和位置控制成为研究热点。文中将模糊神经网络用于电机的位置控制中,模糊逻辑部分获得专家知识,神经网络部分调整参数,通过改变超声电机的驱动频率来实现精确的位置控制,并通过实验和仿真来验证这种方法的有效性。     

声表面波直线电机研究进展

介绍了一种新型的超声电机——声表面波直线电机。这是一种具有极高的分辨率(几个纳米)．长工作行程(几十厘米)的微驱动器。文中从工作原理、实验装置以及存在的问题等方面介绍这种电机的研究发展。     

超声电机振动环境实验研究

超声电机在航空航天领域有着广阔的应用前景。考虑到振动环境对电机工作性能的影响,有必要对超声电机进行振动环境实验。该文就超声电机随机振动实验的条件和方法进行了研究,并设计了一套在振动环境下检测超声电机性能的装置。实验证明本研究所研制的TRUM60型超声电机能在功率谱密度高达0.4 g2/Hz振动环境下工作,其机械性能基本保持不变。     

共阶梯轴双定/转子超声电机的极端环境试验研究EI北大核心CSCD

为了进一步扩展超声电机在航空航天领域的应用范围,综合研究了共阶梯轴双定/转子超声电机在极端环境下的输出特性。对于这种性能优越的新型超声电机,制作了适用于极端环境的试验样机,进行了真空、高/低温复合环境以及振动环境环境试验研究。探讨了各种环境因素对电机性能的影响。结果表明,真空、高温、低温、振动等环境因素会对电机输出性能产生不同程度的影响,共阶梯轴双定/转子超声电机具备一定的极端环境适应性。该研究为超声电机在航空航天领域的广泛应用提供了参考。     

复合型超声电机纵振子位置对电机性能的影响

首先利用超声电机的一维等效模型推导出超声电机纵向振动力因子的表达式，并建立了谐振频率与电机各部分尺寸的关系式。文中以半波长夹心式超声电机的节点位置与压电陶瓷堆中心的距离为变量，分析了纵向振动力因子随着纵振子中心位置变化的情况，从而得出了超声电机内部纵振子的优化位置。将上述分析应用于实验中，取得了较好的效果。     

行波型旋转超声电机温度场分析方法

针对行波型旋转超声电机发热严重的问题,建立三维瞬态温度场的模型.综合考虑超声电机产生损耗的原因,对各部位的损耗进行理论推导和数值计算.利用Ansys软件对理论模型进行仿真,分析了超声电机关键部位的温度分布情况.建立了一套温度测试系统,对理论模型和仿真结果进行试验验证.结果表明,理论分析和试验结果基本吻合,为进一步研究超声电机的热源优化问题提供了分析和试验方法.     

大扭矩超声波电机的结构分析

比较行波型和驻波型超声波电机的驱动机理,简单介绍几种大力矩的超声波电机及其工作原理,分析纵扭复合式超声波电机的结构,归纳出纵扭复合式超声电机的设计步骤,并设计了一台直径为８０ｍ ｍ 纵扭复合式超声波电机的样机     

New fuzzy reasoning-based high-performance speed/position servocontrol schemes incorporating ultrasonic motor

A high-performance servo control scheme using compact ultrasonic motors (USMs) as actuators has not yet been practically realized in modern industry and office automation systems because the dynamic and steady-state modeling of USMs is almost impossible from a theoretical point of view. A high-performance speed/positional servo control scheme based on modern fuzzy reasoning concepts and featuring a traveling wave-type USM with high torque at low speed range is presented. The control method of the USM servo system using inverter frequency and voltage control strategies for the speed and amplitude of the traveling wave on the USM stator and the phase difference control scheme between two-phase high-frequency inverters are demonstrated and evaluated using experimental results. In particular, the control implementation is described from a practical viewpoint     

Speed tracking servo control system incorporatingtraveling-wave-type ultrasonic motor and feasible evaluations

A variety of ultrasonic motors (USMs) have attracted special interest as a new type of actuator in servo motion control systems. For practical applications, the speed servo control system incorporating the ultrasonic motor developed in Japan has some special unique features. However, this system has several significant problems, such as the inherent speed ripple characteristics, the speed regulation characteristics under the condition of applied disturbance load torque, and the speed tracking characteristics. In order to solve these practical problems, some control schemes of ultrasonic-actuated motor systems have been proposed and discussed theoretically, which include fuzzy reasoning control, adaptive control, repetitive learning control, and neural-network-based learning control. However, it is considered that these control strategies mentioned above have not been sufficiently substantiated from a feasible experimental point of view. This paper presents a newly proposed precise speed tracking servo control system using the compact traveling-wave-type ultrasonic motor. Its proposed control scheme is composed of both the driving frequency control loop with the variable-gain strategy and the applied voltage control loop with the speed ripple reduction strategy of the USM. The improved speed characteristics realized by this proposed control system are demonstrated and evaluated in experiments     

超声波电动机的结构优化方法

超声波电动机是近年来工业界和科技界的研究热点,设计和制作高性能超声波电动机的必要手段之一是超声波电动机的结构优化。主要介绍了超声波电动机结构优化的发展状况,着重讨论了其优化目标、优化方法和求解环境;最后分析了现行优化方法的不足之处及未来发展方向。     

A new design method and half-step operation for ultrasonic stepping motors

In this paper, a systematic design method and a new half-step operation are proposed for ultrasonic stepping motors (USMs) which are based on the principle of spatially shifted standing vibrations. With emphasis on the combination of the order of vibration mode, the number of spatial phase shifts, the number of electrodes, and the number of simultaneously excited electrodes, the design equations and constraints are newly derived, hence, proposing the design procedure. The finite-element method and impedance measurement are also employed to investigate the vibration of the stator. By borrowing the control idea of electromagnetic stepping motors, the half-step operation is newly applied to this USM so that the step size can be further halved. An 80-step USM is prototyped. The proposed design method and half-step operation are well supported by experimentation.     

Adaptive control-based high-performance drive system implementation of traveling-wave-type ultrasonic motor

In recent years, ultrasonic motors (USM) as new actuators have attracted special interest. Several kinds of constructions and characteristics of USMs have been reported so far. Of these USMs, a traveling wave-type USM has many characteristics such as: high torque in the low-speed range, large holding torque based upon frictional force, flexible free forms, compactness in size and low magnetic noise. In practice, an inherent mechanical resonant frequency and a velocity amplitude of USM are changed largely according to operating temperature due to frictional drive, load disturbance torque, and applied voltage levels. Therefore, it is necessary to develop a new control system which solves these items and always supplies the required power with high efficiency and high performance in the practical applications. This paper proposes mainly a new sensorless high-performance control scheme of an inverter-fed ultrasonic motor, which is based on a control system technology with two feedbacks incorporating automatic resonant frequency tracking and constant velocity amplitude control strategies. This control system is realized in terms of a high-frequency chopper and a two-phase series/parallel resonant inverter. The experimental results are demonstrated and discussed compared with the theoretical ones.     

Ultrasonic motors: Their models, drives, controls and applications

In the last decades piezoelectrically driven ultrasonic motors have become alternative actuators to the conventional electromagnetic motors especially for precise and accurate servo positioning applications. Different types of ultrasonic motors have been constructed and manufactured. Several drive systems have been designed, implemented and proposed for these motors. A variety of control techniques have been applied to them. The research given in this study covers bases of the ultrasonic motors. Theoretical background, modeling, drive systems, control techniques and applications of the ultrasonic motors have been introduced. Firstly, the general overview has been given. Then, modeling studies focused on performance estimation and analysis of ultrasonic motors have been examined. Afterwards, drive systems and control techniques of ultrasonic motors have been investigated. Furthermore, an example drive and control system has been presented. This drive system has been designed as to be controlled digitally. In addition, the important industrial and research applications of these motors have been included. The presented study has been arranged as a review of ultrasonic motors. The important points of specifications, models, drive systems and control methods of the ultrasonic motors have been emphasized.     

基于SCI-E数据库的超声电动机研究

通过SCI-E电子数据库,在作者、国家/地区、机构、出版年、文献来源、主题种类等方面,全面、客观地分析超声电机在国内外的研究发展状况及趋势,用具体数字为中国超声电动机研究提供参考和帮助.     

连续方波脉冲电压下局部放电测量的研究现状

介绍了连续方波脉冲电压下局部放电测量的研究进展,尤其是与变频调速电机相关的研究现状。总结了目前国内外学者主要采用的测量系统,分析了部分目前仍然存在争议的结论及部分有待深入研究的内容。最后从实际应用出发,提出了几条延长变频电机绝缘寿命的方法。     

超声电动机控制技术的现状和展望

简介超声电动机的工作原理和运行特性,介绍近几年超声电动机控制技术领域的最新成果,比较超声电动机的一些常用控制手段,分析其优缺点,并在此基础上指出超声电动机控制技术的发展方向。