Design and Research on a Biped Clamp and Pull Piezoelectric Linear Motor Based on Inchworm Principle

Abstract

The piezoelectric linear motor based on piezoelectric ceramic stack has a potential in high-tech field’s application such as optical waveguide packaging. Mechanical properties of piezoelectric linear motors in the existing researches still need to be improved. So have designed double foot clamping type piezoelectric linear motor based on the principle of inchworm, and analyzed the working principle. The performance analysis of the driving mechanism shows that the relationship between the amplitude of driving mechanism and voltage values is positively proportional, and the influence of frequency on its amplitude is not big. The performance of the clamping mechanism was studied through experiments. First, verified the feasibility of the principle, tested the amplitude and found that the amplitude increases with the increase of the voltage, but due to the influence of clamping mechanism modal, amplitude tends to be zero as frequency increase to a certain extent. Second, amplitudes of the driving foot in two clamping mechanism were compared to ensure the consistency of amplitude of each driving foot, and the magnification of driving mechanism displacement was obtained by clamping mechanism in the practical work. Analyzed the rail vibration caused by driving foot and the prototype speed characteristics and load characteristic, and obtained speed characteristic curve are, in which, the speed of the motor increases with increasing voltage, but will not be able to continue to increase when the voltage reached to 60V, and the related curve between frequency and speed is similar to the frequency characteristic curve of the clamping mechanism, which is mainly due to the impact from the clamping mechanism modal. Obtained the maximum output of the motor power is 1.8 N through the load characteristic experiment.