4.8 Article

A High-Power-Density Piezoelectric Actuator Operating in Bicycling Movement Mechanism

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 70, Issue 6, Pages 6090-6098

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3190900

Keywords

Actuators; Vibrations; Piezoelectric actuators; Ceramics; Bars; Resonant frequency; Friction; Bionic motion; large power density; linear piezoelectric actuator; precise actuation

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Comprehensive high-precision actuations are in growing demand to meet diversified needs in scientific and industrial fields. Inspired by bionic methodology, a high-power-density bar-type linear piezoelectric ultrasonic actuator (LPUA) has been developed by imitating bicycle movement mechanism. The experimental results indicate that the proposed piezoelectric actuator with excellent actuation performances has broad application scenarios, and its bionic motion design method would have inspirational significance for creating new piezoelectric devices with more attractive properties.
Comprehensive high-precision actuations are in growing demand to meet diversified needs in scientific and industrial fields. However, it is a great challenge for piezoelectric actuators with compact structure to guarantee high load capacity and wide velocity range (including fast motion velocity and high resolution) simultaneously. Herein, inspired by bionic methodology, a high-power-density bar-type linear piezoelectric ultrasonic actuator (LPUA) operating in the single second bending (B-2) mode with elaborate working principle is developed by imitating bicycle movement mechanism. The proposed B-2-LPUA actuator is simple and easy for miniaturization without multimodal decoupling problem. Under only one-phase voltage drive, the miniature bar-type actuator can produce continuously bidirectional motions with the maximum driving velocity, minimum driving velocity, load, and output power of 211.2 mm/s, 3.3 mu m/s, 5.4 N, and 218.3 mW, respectively, and the tested minimum step displacement is only 33 nm in open-loop control. Especially, its output power density (243 mW/cm(3) or 4.112 mW/cm(3)center dot kHz) is at least twice larger than most reported LPUAs. The experimental results indicate that the proposed piezoelectric actuator with excellent actuation performances has broad application scenarios, and its bionic motion design method would have inspirational significance for creating new piezoelectric devices with more attractive properties.

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