A walking type piezoelectric actuator based on the parasitic motion of obliquely assembled PZT stacks

Abstract

In order to decrease the backward motion and improve the motion efficiency, a walking type piezoelectric actuator has been proposed with two ‘legs’ based on the parasitic motion of obliquely assembled PZT stacks. The structure and motion principle of the proposed walking type piezoelectric actuator are described, and its experiment system is set up. Experimental results indicate the proposed piezoelectric actuator could reduce the backward motion effectively. The minimum backward rate α= 2.26% is achieved under the condition of the phase difference θ= 180°, the input voltage U= 120 V and the input frequency f= 1 Hz; the minimum stepping displacement is 0.24 μm under the condition of U= 5 V, f= 1 Hz and θ= 180°; the maximum speed V max is 2472 μm s−1 under the condition of U =120 V and θ= 180°; the maximum vertical load force F Vmax = 6850 g under the condition of U = 120 V, f = 1 Hz and θ = 180°. Furthermore, a dynamic model of the whole walking type piezoelectric actuator is established, and it has been employed to simulate the motion of the proposed walking type piezoelectric actuator. Simulation results present a great agreement of experimental results. This study shows a novel idea for the design of piezoelectric actuators to eliminate the influence of backward motion and improve the output efficiency of the actuator.

Bionic Stepping Motors Driven by Piezoelectric Materials

“…Large preload force of the rotor and the large mass of the inertia block can reduce the rollback motion and increase the load capacity of the inertia motor. As for the seal motors composed of one feeding module, one clamping module and one locking component, the properties of the structure, oscillation, and velocity as well as the complexity of control system are at an intermediate level between those of the inchworm motors and inertia motors [83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99][100].…”

“…In addition, the pusher motor is provided with a high speed due to the light weight of the rotor . Clearly, the characteristics of the hybrid motor are at an intermediate level between those of the walker motor and the pusher motor [95][96][97][98][99][100].…”

A stick-slip actuator for suppressing the backward motion by introducing a flexible beam

“…The output force of a piezo-stack (Li et al, 2021a(Li et al, , 2021b is derived from the following equation:…”

“…Piezoelectric actuators are characterized by several advantages, such as high resolution, high response velocity, no magnetic field interference, compact structure, and low operating conditions (Li et al, 2021a(Li et al, , 2021bMirvakili and Hunter, 2018). Therefore, piezoelectric driving technology is widely used in precision systems including micro/nanoindentation, scratch testing, optical focusing, and micro-robots (Jalili et al, 2016;Oubellil et al, 2019;Qiu and Piyawattanametha, 2019;Ren and Zou, 2014).…”

“…To suppress the backward motion, Qiu et al (2021) proposed the cooperation of upper and lower stick-slip actuators. Li et al (2021aLi et al ( , 2021b) developed a walking stick-slip actuator to suppress the backward motion. To improve the load capacity, Zhang et al (2012) processed the working surface of an actuator by various degrees.…”