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Actuators 2015, 4(3), 172-181; doi:10.3390/act4030172

Ultracompact Planar Positioner Driven by Unbalanced Frictional Forces

Department of Mechanical Engineering, Akita University, Tegatagakuen-machi 1-1, Akita 010-8502, Japan
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Academic Editor: Delbert Tesar
Received: 22 June 2015 / Accepted: 10 August 2015 / Published: 12 August 2015
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Abstract

This paper proposes a new ultracompact planar positioner driven by unbalanced frictional forces. The prototype of the designed positioner is 17 mm × 17 mm × 9 mm in size, and is simply constructed using lead zirconate titanate piezoelectric elements, neodymium magnetic feet, and junction pieces. Alternating static and kinetic frictional forces are utilized to control the motion of the positioner. The working principle is illustrated, and the performance of the positioner is evaluated under atmospheric and vacuum conditions. Under atmospheric conditions, the positioner had a minimum step size of approximately 17 nm at 55 V, a maximum step size of approximately 1.6 μm, and a moving speed of approximately 4 μm/s at 138 V. However, the step size significantly decreased in vacuum. The step size can be controlled by adjusting the frictional forces on the magnetic feet. In addition, the positioner showed instability caused by the wear of the stainless plate. This problem was resolved by using a borosilicate glass that was fixed on the stainless plate, and the position accuracy was obviously improved. View Full-Text
Keywords: planar positioner; PZT; frictional force planar positioner; PZT; frictional force
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Muraoka, M.; Zhao, X.; Liu, S. Ultracompact Planar Positioner Driven by Unbalanced Frictional Forces. Actuators 2015, 4, 172-181.

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