A novel single butterfly stator piezo driver

Abstract

In this paper, a new type of single butterfly piezo stick-slip linear actuator is proposed. The butterfly stator is driven by two symmetrical rectangular piezoelectric vibrators that are fixed at both ends to achieve a linear drive based on stick-slip motion. Based on the finite element method, the appropriate parameters of the rectangular piezoelectric vibrator with both ends fixed are obtained. Simulation analysis shows that the butterfly stator can increase the static friction force during the slow extension stage by driving the lateral movement of the foot, and reduce the dynamic friction force during the rapid contraction stage. A prototype was made and a series of experiments was conducted. Experimental results show that the maximum no-load motion velocity is about 3042 μm/s at a voltage of 100 V and a frequency of 1000 Hz; the maximum output force is 0.7 N at a voltage of 100 V and a locking force of 3.5 N; at a voltage of 60 V, At a frequency of 10 Hz and a locking force of 3.5 N, the minimum step displacement is about 0.77 μm.