STUDIES ON CONSTRUCTIONS AND CHARACTERISTICS OF PIEZOELECTRIC ACTUATORS

1.首先，通过考虑用于形成椭圆位移运动以给出转子旋转的模式组合，系统地研究了超声波电机的一些结构，并且发现电机可以分为三类（发表的技术报告：5）。接下来，可以通过原型电动机的实验来研究具体的电动机特性。也就是说，（1）在使用弯-弯多模式振动器的电动机中，使用圆盘或环形板的非轴对称振动模式来实现轻负载型和重负载型的薄电动机。并对这些振动模态进行了详细的分析，明确了其应用于超声波电机的设计条件。（技术报告：16）。(2)在纵弯多模振子电机中，主要实现了一种新型的平板型直线电机。(3)在使用纵向-扭转振动模式的电动机中，可以使用多模式振动器实现用于1.0 - 3.0的重负载的杆型电动机，并且还可以通过组合纵向振动的单个谐振模式振动器和扭转振动的单个谐振模式振动器来获得用于轻负载的电动机（技术报告：8）。Kg.cm线性自移动装置对于这些装置，研究了（1）线性自移动致动器和（2）纸张或卡片传送装置。在前者中，纵向L1弯曲B8多模式振动器的细杆型和（R，1）-（（1，1））模式的环形板振动器，以实现快速响应的机器人装置（技术报告：3）。在后者中，可以开发用于送纸器和预付费读卡器的新设备（报告：2）。3.本文研究了小位移器件在时钟应用中的应用，包括（1）高速工作的输入电压波形和（2）一种新的角位移精确控制方法。

1. Ultrasonic Motors First of all, some constructions of an ultrasonic motor were investigated systematically by considering mode combinations used for formation of an elliptic motion of displacement to give the revolution of rotor, and it is found that the motors could be classified into three groups (Technical reports published: 5). Next, the concrete motor characteristics could be investigated through experiments of prototype motors. That is, (1) in the motors using flexural-flexural multi-mode vibrators, non- axisymmetric vibration modes of a disk or an annular plate were used to achieve the thin motors of light load type, and of heavy load type. Moreover, detailed analyses of these vibration modes were done and some design conditions for its application to an ultrasonic motor were made clear.(Technical reports: 16). (2) In the motors using longitudinal- flexural multi-mode vibrators, a new flat-type linear motor could be achieved mainly.(3) In the motors using longitudinal-torsional vibration modes, a rod-type motor for a heavy load of 1.0 - 3.0 Kg.cm could be achieved using the multi-mode vibrators, and moreover the motor for a light load could be obtained combining a single resonance mode vibrator of longitudinal vibration and one of torsional vibration (Technical reports: 8) 2. Linearly Self-Moving Devices As for the devices, (1) a linearly self-moving actuator and (2) a paper or card forwarding device were investigated. In the former, the longitudinal Ll-bending B8 multi-mode vibrator of thin bar type and the (R,1)-((1,1)) mode annular plate vibrator were used to achieve the robot device of quick response (Technical reports:3). In the latter, new devices for a paper feeder and a prepaid p card reader could be developed (Reports: 2). 3. Small Displacement Devices n an (1) Input voltage wave form for high speed operation and (2) a new precise control method of angular displacement were investigated to be utilized in the clock application.