Design and Performance of Precision Symmetric Two-stage Micro-drive Amplification System

doi:10.12382/bgxb.2021.0351

Abstract

Abstract: In order to obtain a fretting platform with high motion precision，no parasitic motion，large amplification ratio and adjustable，based on the guiding principle，driving principle and mechanism lever principle of straight round flexure hinge，a two-stage amplification mechanism with symmetric driving and adjustable amplification ratio (design amplification ratio is 1∶5) is designed. The design scheme of precision two-stage micro-drive amplification system driven by piezoelectric actuator is proposed.The guiding principle and additional force balance principle of the driving performance of the micro mechanism were analyzed，and the two-stage amplification ratio of the two-stage micro-drive amplification mechanism was calculated theoretically. The driving performance of the system micro actuator is analyzed by experimental method，and its driving equation is analyzed. The strength，modal and motion performance of the system are analyzed by finite element method. The analysis results show that the strength and modal performance of the system meet the requirements，and the system has high motion precision (The maximum absolute error and relative error are 6.27 μm and 8.36% respectively in the motion stroke）.The two-stage micro-drive amplification system with precision symmetric driving designed in this paper has the advantages of high motion precision，excellent safety performance，large amplification ratio and adjustable.

Key words: two-stagemicro-driveamplification, micromechanism, flexurehinges, piezoelectricactuator

CLC Number:

TH112

YANG Manzhi，JING Gang，GUO Wei，ZHANG Chuanwei，WU Hongzhang，WEI Kaiyang, LI Linyue，L Zhenyang，GUI Haochen，ZHANG Xiaodong. Design and Performance of Precision Symmetric Two-stage Micro-drive Amplification System[J]. Acta Armamentarii, 2022, 43(6): 1456-1465.

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