A novel cooperative compensation method to compensate for return stroke of stick-slip piezoelectric actuators

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

A novel piezoelectric linear actuator designed by imitating skateboarding movement

Abstract In the field of stick-slip type piezoelectric actuators, the actuator with simple and compact structure has been given significant research and design value. A compact stick-slip piezoelectric actuator based on right triangle flexible stator is proposed and evaluated in this work. The proposed actuator only includes a right triangular type stator inserted with a PZT stack and it has the merit of simple structure. The PZT stack is excited under a sawtooth waveform voltage, and the elongation deformation of the PZT stack makes the driving foot move obliquely due to the right triangular stator. The slider is pressed under the vertical component of the oblique movement, while the slider is actuated under the horizontal component simultaneously. The working principle of the proposed actuator is illustrated by theoretical and simulation methods in detail. The proposed actuator is fabricated and its output characteristics are measured. The experimental results show that the maximum output speed of the developed actuator is 4.6 mm s −1 when the voltage and frequency are 100 V and 720 Hz. It has the merit of simple design and relatively better performance by series of comparisons with some existing works. 

Design and performance of a compact stick-slip type piezoelectric actuator based on right triangle flexible stator

In the field of stick-slip type piezoelectric actuators, the actuator with simple and compact structure has been given significant research and design value. A compact stick-slip piezoelectric actuator based on right triangle flexible stator is proposed and evaluated in this work. The proposed actuator only includes a right triangular type stator inserted with a PZT stack and it has the merit of simple structure. The PZT stack is excited under a sawtooth waveform voltage, and the elongation deformation of the PZT stack makes the driving foot move obliquely due to the right triangular stator. The slider is pressed under the vertical component of the oblique movement, while the slider is actuated under the horizontal component simultaneously. The working principle of the proposed actuator is illustrated by theoretical and simulation methods in detail. The proposed actuator is fabricated and its output characteristics are measured. The experimental results show that the maximum output speed of the developed actuator is 4.6 mm s−1 when the voltage and frequency are 100 V and 720 Hz. It has the merit of simple design and relatively better performance by series of comparisons with some existing works.

With the help of the parasitic motion of the asymmetrical trapezoid flexure mechanism, a piezoelectric actuator which could achieve linear motion with large working stroke has been presented and inspected. The structure of the asymmetrical trapezoid flexure mechanism and the motion principle of the proposed piezoelectric actuator are introduced and investigated in details. Finite Element Method (FEM) has been exploited, and an experimental system has been built up to study the working performance of the proposed piezoelectric actuator. Simulation results confirm that the parasitic motion could be achieved by the asymmetrical trapezoid flexure mechanism. Additionally, the dynamic model has been proposed for the investigation. Experimental results show that the presented actuator could obtain continuous linear motion with large working stroke by the parasitic motion of the proposed asymmetrical trapezoid flexure mechanism. The minimum stepping displacement of the proposed actuator is 0.68 μm; the maximum speed is 4676 μm/s; the output force could be as large as 91.3 g. This study shows a meaningful idea of the utilization of the asymmetrical trapezoid flexure mechanism for the design of novel piezoelectric actuators.

A parasitic type piezoelectric actuator with the asymmetrical trapezoid flexure mechanism

A walking type piezoelectric actuator with two umbrella-shaped flexure mechanisms

Piezoelectric actuators are widely utilized in many research and industrial fields, since they could achieve high positioning accuracy based on inverse piezoelectric effect. However, the working stroke of piezoelectric actuators is always limited, which restricts the further application of piezoelectric actuators. In order to solve this problem on short working stroke, this study introduces an umbrella-shaped linear piezoelectric actuator to achieve a large working stroke. Unlike traditional stick-slip actuators, the PZT stack inside the umbrella-shaped flexure mechanism is assembled vertically to the slider. The composition and motion principle are discussed, and FEM (Finite Element Method) and experiments are utilized to explore the performance of the proposed actuator. Experimental results show that the minimum stepping displacement is $0.495~\mu \text{m}$ in the case that the input voltage $U=30\text{V}$ and the frequency $f=1$ Hz; the maximum speed is $992.4~\mu \text{m}$ /s under the condition of the input frequency $f=400$ Hz and the input voltage $U=120\text{V}$ ; the maximum load is 220g in the case of the input voltage $U=120\text{V}$ and the frequency $f=1$ Hz. This study indicates that the proposed umbrella-shaped linear piezoelectric actuator is feasible and could achieve a stable large working stroke.

/pdf/an-umbrella-shaped-linear-piezoelectric-actuator-based-on-2q9nrxmc2e.pdf

An Umbrella-Shaped Linear Piezoelectric Actuator Based on Stick-Slip Motion Principle

https://link.springer.com/content/pdf/10.1007/s42235-021-00081-0.pdf

Cai Junjie

Papers

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

A parasitic type piezoelectric actuator with the asymmetrical trapezoid flexure mechanism

A walking type piezoelectric actuator with two umbrella-shaped flexure mechanisms

An Umbrella-Shaped Linear Piezoelectric Actuator Based on Stick-Slip Motion Principle

A Novel Bionic Piezoelectric Actuator Based on the Walrus Motion