A compliant parallel XY micromotion stage with complete kinematic decoupling

Yangmin Li, Jiming Huang, Hui Tang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

133 Citations (Scopus)

Abstract

This paper presents a novel compliant parallel XY micromotion stage driven by piezoelectric actuators (PZT). With the purpose to obtain complete kinematic decoupling and good stiffness performance, the stage is designed using a symmetric 4-PP structure in which double four-bar flexure is chosen as the prismatic joint. Matrix method is employed to establish the compliance model of the mechanism. Based on the model, dynamic analysis is investigated after static analysis is carried out. The dimensions of the mechanism are optimized using the particle swarm optimization (PSO) algorithm in order to maximize the natural frequencies. Finite-element analysis (FEA) result indicates that the mechanism has an almost linear force-deflection relationship, high first natural frequency (720.52 Hz), and ideal decoupling property. To cope with the nonlinearities such as hysteresis that exists in the PZT, the control system is constructed by a proportional-integral-derivative (PID) feedback controller with a feedforward compensator based on Preisach model. The fabricated prototype has a 19.2 μm × 8.8 μm rectangular workspace with coupling less than 5%. The result of the closed-loop test shows that the XY stage can achieve positioning, tracking and contouring tasks with small errors.
Original languageEnglish
Article number6208835
Pages (from-to)538-553
Number of pages16
JournalIEEE Transactions on Automation Science and Engineering
Volume9
Issue number3
DOIs
Publication statusPublished - 4 Jun 2012
Externally publishedYes

Keywords

  • Flexure hinge
  • micromotion stage
  • piezoelectric actuation
  • Preisach model

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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