BASIC RESEARCH OF PIEZOELECTRIC ACTUATORS

超声波马达和位移装置作为压电致动器的应用在该项目中进行了研究，因为超声波马达等一直是个人想法的结果，尚未完成对其结构的系统考虑。也就是说，本报告涉及超声波电机等的各种结构，并描述了其应用的示例。本研究的主要结果如下：1.弯曲行波的基本考虑及其应用2.超声波马达的结构及其特性3.薄型超声波马达利用多模态振子的椭圆运动，在其水平面内振动。一些位移装置的理论和实验考虑5.压电作动器的高速工作和无瞬态响应的研究这些结果的内容发表在研究报告“书”中。从压电作动器系统公式的观点出发，必须研究以下几点：（1）设计超声波电动机等的等效电路;（2）定子被转子压下时的椭圆位移运动;（3）定子振子有效激励方法的研究。特别是利用压电陶瓷（4）的纵向效应，本文对压电作动器的高速工作和瞬态响应的防止进行了详细的实验研究，希望能对压电作动器的高速工作和瞬态响应的防止作出贡献。通过对上述几点的研究，提出了一种新型的压电驱动器。

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.