Structure design of hinged beam type clamp for miniature linear ultrasonic motor

Abstract

This paper designed a hinged type beam clamping structure based on the characteristics of the Langevin-type transducer oscillator having obvious vibration node. The corresponding motor stator was developed based on the previous U-shape type linear ultrasonic motor. A simple mechanical model of the structure was established to analyze the effects of spring stiffness on the normal pressure and tangential friction force at the contact interface. Experimental results indicate that the output performance and stability of the motor reached a good state when the preload spring stiffness is sufficiently large and the preload is appropriate. Compared with the original arc clamping of the motors, the output force and speed of the motor were improved when the proposed hinged type beam clamping structure was adopted. The maximum no-load speed reached 712mm/s that increased by 51.5%, and the maximum force reached 10N that increased by 11.1%.