Development of a flat type six-axis stage based on piezoelectric actuators

Hau Wei Lee, Tsung Ting Hsieh, Chin Chia Liu, Chien Hung Liu

Research output: Contribution to journalArticle

Abstract

This study presents and investigates a six-DOF (degrees of freedom) piezoelectric based stage for positioning error compensation. The relationship between the displacement of the piezoelectric actuators and the stage can be computed according to the geometric relationships of the actuators installed. In this study, a feedforward compensator based on the hysteresis model has been designed for compensation and a PI controller was used for positioning. The combination of a feedforward compensator and PI controller gives the stage good positioning and tracking performance. Stage position information is feedback from a six-DOF optical measurement system comprised of three modular two-dimensional measurement devices. Each module employs a quadrant photodiode (QPD), a laser diode, and a lens. The measurement signal is acquired and processed using an FPGA based processor for real time control. The linear and angular positioning resolution is 0.02 m and 0.1 arcsec, respectively. When the stage is controlled in a closed loop, the positioning errors are in the range of ± 0.1 m and ± 0.5 arcsec. The stage is controlled to track a sinusoidal wave with an amplitude of 2.5 m and a frequency of 5 Hz; tracking errors were within ± 0.1 m and ± 0.2 arcsec.

Original languageEnglish
Article number523786
JournalMathematical Problems in Engineering
Volume2014
DOIs
Publication statusPublished - 2014

Fingerprint

Piezoelectric Actuator
Piezoelectric actuators
Positioning
PI Controller
Compensator
Error compensation
Feedforward
Controllers
Real time control
Photodiodes
Hysteresis
Semiconductor lasers
Field programmable gate arrays (FPGA)
Lenses
Real-time Control
Actuators
Error Compensation
Optical Measurement
Quadrant
Photodiode

All Science Journal Classification (ASJC) codes

  • Mathematics(all)
  • Engineering(all)

Cite this

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abstract = "This study presents and investigates a six-DOF (degrees of freedom) piezoelectric based stage for positioning error compensation. The relationship between the displacement of the piezoelectric actuators and the stage can be computed according to the geometric relationships of the actuators installed. In this study, a feedforward compensator based on the hysteresis model has been designed for compensation and a PI controller was used for positioning. The combination of a feedforward compensator and PI controller gives the stage good positioning and tracking performance. Stage position information is feedback from a six-DOF optical measurement system comprised of three modular two-dimensional measurement devices. Each module employs a quadrant photodiode (QPD), a laser diode, and a lens. The measurement signal is acquired and processed using an FPGA based processor for real time control. The linear and angular positioning resolution is 0.02 m and 0.1 arcsec, respectively. When the stage is controlled in a closed loop, the positioning errors are in the range of ± 0.1 m and ± 0.5 arcsec. The stage is controlled to track a sinusoidal wave with an amplitude of 2.5 m and a frequency of 5 Hz; tracking errors were within ± 0.1 m and ± 0.2 arcsec.",
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Development of a flat type six-axis stage based on piezoelectric actuators. / Lee, Hau Wei; Hsieh, Tsung Ting; Liu, Chin Chia; Liu, Chien Hung.

In: Mathematical Problems in Engineering, Vol. 2014, 523786, 2014.

Research output: Contribution to journalArticle

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