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A Large-Stroke 3DOF Stage With Integrated Feedback in MEMS

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Abstract—In this paper, we design, fabricate, and validate a large-stroke 3-degree-of-freedom (DOF) positioning stage with integrated displacement sensors for feedback control in a single-mask microelectromechanical systems (MEMS) fabrication process. Three equal shuttles exactly define the position of the stage in x, y, and Rz. The kinematic relation between the shuttle positions and the stage position is given by the geometric transfer function. By increasing the order of this geometric transfer function, the stage error can be reduced. Each shuttle consists of a flexure mechanism, a position sensor, and electrostatic comb drive actuators for actuation along a straight line. The range
of motion of the stage is limited by electrostatic pull-in of these comb drives. Three parameters of the stage, the leafspring length, the eccentricity, and the tangential arm, have been varied to find
their influence on the stage range of motion. These simulation results can be used to design stages with different specifications. Position control of the individual shuttles is applied to control the
position of the stage. The stroke of the 3DOF stage is verified up to 161 μm in x, 175 μm in y, and 325 mrad in Rz. This exceeds the range of motion of existing stages. [2014-0314]

Index Terms—Comb-drive actuators, thermal position sensors, position control

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Informasi Detail

Judul Seri

JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 24, NO. 6, DECEMBER 2015

No. Panggil

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Penerbit

: IEEE., 2015

Deskripsi Fisik

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Bahasa

English

ISBN/ISSN

1057-7157

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

VOL. 24, NO. 6, DECEMBER 2015

Subjek

MIKROELEKTROMEKANIKAL

Info Detail Spesifik

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Pernyataan Tanggungjawab

ETY

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