IJAT Vol.12 No.5 pp. 784-790
doi: 10.20965/ijat.2018.p0784

Technical Paper:

Orientation Compensation of an Inchworm Stage with Optical Navigation

Akihiro Torii, Yuta Mitsuyoshi, Suguru Mototani, and Kae Doki

Aichi Institute of Technology
1247 Yachigusa, Yakusa-cho, Toyota, Aichi 470-0392, Japan

Corresponding author

January 31, 2018
July 17, 2018
September 5, 2018
inchworm, piezoelectric actuator, positioning, orientation, optical feedback control

The orientation compensation of a three-degrees-of-freedom inchworm stage with optical navigation is described. As the stage does not use any guide or preload, a closed loop feedback control system is employed to retain the accurate orientation of the stage. The stage consists of piezoelectric actuators (piezos) for thrusting and electromagnets for positioning. A non-excited electromagnet is moved by the deformation of piezos, and excited electromagnets retain their positions. However, a weak electromagnetic force prevents the stage from retaining its accurate position. In addition, a friction force reduces the displacement of the non-excited electromagnet. Therefore, the orientation of the stage is measured using a light source and an optical detector, and the deformation of the piezos is controlled. The orientation error is reduced by using optical navigation.

Cite this article as:
A. Torii, Y. Mitsuyoshi, S. Mototani, and K. Doki, “Orientation Compensation of an Inchworm Stage with Optical Navigation,” Int. J. Automation Technol., Vol.12, No.5, pp. 784-790, 2018.
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Last updated on Dec. 11, 2018