Development of High-Torque Ultrasonic Motor Using Complex Vibration

超声波电机具有低速高转矩、高保持转矩和无声运动等独特特性。然而，它们的应用限于某些机制，例如，相机的自动对焦机制。由于超声波电机本身的易碎性，使得实际应用中的超声波电机难以产生较大的转矩。螺栓固定式朗之万型纵振换能器是一种满足高强度、大振幅要求的换能器。设计了一种新型驻波型超声波电机。三个BLT以螺钉的形状安装。研究了螺旋形超声波电机的振动特性和负载特性。超声波马达的最大扭矩、转速和效率分别为0.67 Nm、582 rpm和7.63%。

Ultrasonic motors have unique characteristics such as high torque at low speed, high holding torque, and silent motion. However, their applications are limited to certain mechanisms, e.g., autofocus mechanisms of cameras. It is difficult for practical ultrasonic motors to generate higher torque because they are fragile. A bolt-clamped Langevin-type longitudinal vibration transducer (BLT) is a transducer which satisfies high strength and large amplitude. A new standing-wave-type ultrasonic motor that incorporates BLTs was devised. Three BLTs are installed in the shape of a screw. The vibration and load characteristics of the screw-shaped ultrasonic motor were studied. The maximum torque, revolution speed, and efficiency of the ultrasonic motor were 0.67 Nm, 582 rpm, and 7.63%, respectively.