Lamberti N, Iula A, Pappalardo M
Dipartimento d'hgegneria dell'hformazione ed Ingegneria Elettrica, Universitk di Salerno, Fisciano (SA), Italy.
IEEE Trans Ultrason Ferroelectr Freq Control. 1998;45(1):23-9. doi: 10.1109/58.646901.
This paper describes a new implementation of a disk-type piezoelectric motor, whose stator is a commercial available piezomembrane composed of a nickel alloy disk to which a piezoceramic disk is bonded. The two disks are concentric, and the total thickness is very small. Ultrasonic motors are based on the concept of driving a rotor by mechanical vibration excited on a stator, via the piezoelectric effect. The rotor is in contact with the stator, and the driving force is the frictional force between rotor and stator. To transform the mechanical vibration of the stator in the rotor rotation, a traveling wave must be excited on the stator surface. The proposed motor can be regarded as a disk-type, single wavelength motor in which the traveling wave is due to the natural flexural vibration of the piezomembrane at low frequency. The behavior of the stator is analyzed both theoretically, by using the theory of isotropic and homogeneous vibrating plates, and by means of a commercial finite element computer code, finding a good agreement with the experimental results. The main features of the motor are very small thickness, appreciable torque, and high speed, obtained with low input power at low voltage; the intended application is to substitute the moving-coil in analogic instrumentation.
本文描述了一种盘式压电电机的新实施方案，其定子是一种商用的压电膜，由镍合金盘和粘结在其上的压电陶瓷盘组成。这两个盘是同心的，总厚度非常小。超声波电机基于通过压电效应在定子上激发机械振动来驱动转子的概念。转子与定子接触，驱动力是转子与定子之间的摩擦力。为了将定子的机械振动转化为转子的旋转，必须在定子表面激发行波。所提出的电机可被视为盘式单波长电机，其中行波是由压电膜在低频下的自然弯曲振动引起的。通过使用各向同性均匀振动板理论并借助商业有限元计算机代码，从理论上分析了定子的行为，发现与实验结果吻合良好。该电机的主要特点是厚度非常小、转矩可观、速度高，在低电压下以低输入功率即可实现；预期应用是替代模拟仪器中的动圈。
