BASIC RESEARCH OF PIEZOELECTRIC ACTUATORS

由于超声波电机等都是个人想法的结果，对其结构的系统考虑还没有完成，本课题研究的是超声波电机和位移装置作为压电驱动器的一种应用。也就是说，本文讨论了超声波电机等的各种结构，并给出了一个应用实例。本文的研究成果总结如下：1.弯曲行波及其应用的基本思路。超声波马达的结构及其特点。薄型超声波马达使用多模式振子的缺陷的椭圆形运动，在其水平面上振动。一些位移装置的理论和实验考虑5。关于压电致动器的高速运行和非瞬变响应的研究这些结果的内容刊载在研究报告《书》中。从系统地建立压电作动器的数学模型出发，今后必须研究以下几个问题：(1)超声波电机等的等效电路设计；(2)转子按压时定子内椭圆运动的位移运动；(3)定子振子有效激励方法的研究，特别是利用压电陶瓷的纵向效应；(4)压电作动器高速运行和暂态响应抑制的详细实验研究。作者希望通过以上几点的研究，为压电作动器这一新型器件的发展做出贡献。

An ultrasonic motor and a displacement device as an application of piezoelectric actuators have studied in the project, because the ultrasonic motors etc. have been the result of individual ideas and systematic consideration of its constructions has not been accomplished. That is, this report deals with various constructions for an ultrasonic motor etc. and an example of its application is described. Results of this research are summarized as follows:1. Fundamental consideration of flexural progressive wave and its application2. Constructions of an ultrasonic motor and its characteristics3. Thin form ultrasonic motors using the elliptic motions of displecements of multi-mode vibrators, vibrating in its horizontal face4. Theoretical and experimental considerations of some displacement devices5. Studies for high speed operation and no-transient response of piezoelectric actuatorsConcreate contents of these results are printed in the research report " book ". From view-points of systematic formulation for piezoelectric actuators, followings must be investigated hereafter(1) Equivalent circuit of an ultrasonic motor etc. for its designing(2) Movements of elliptic motion in displacements in the stator when pressed down by the rotor(3) Investigation of effective excitation method for the stator vibrator, especially using longitudinal effect of piezoelectric ceramics(4) Detail experimental studies for high sped operation and prevention of transient responses of piezoelectric actuatorsThe authors wish to make a great contribution to developments of a piezoelectric actuator as a new device through studies of points mentioned above.