An ultrasonically levitated noncontact stage using traveling vibrations on precision ceramic guide rails

Koyama, D, Ide, T, Friend, J, Nakamura, K and Ueha, S 2007, 'An ultrasonically levitated noncontact stage using traveling vibrations on precision ceramic guide rails', IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 54, no. 3, pp. 597-604.


Document type: Journal Article
Collection: Journal Articles

Title An ultrasonically levitated noncontact stage using traveling vibrations on precision ceramic guide rails
Author(s) Koyama, D
Ide, T
Friend, J
Nakamura, K
Ueha, S
Year 2007
Journal name IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Volume number 54
Issue number 3
Start page 597
End page 604
Total pages 8
Publisher IEEE
Abstract This paper presents a noncontact sliding table design and measurements of its performance via ultrasonic levitation. A slider placed atop two vibrating guide rails is levitated by an acoustic radiation force emitted from the rails. A flexural traveling wave propagating along the guide rails allows noncontact transportation of the slider. Permitting a transport mechanism that reduces abrasion and dust generation with an inexpensive and simple structure. The profile of the sliding table was designed using the finite-element analysis (FEA) for high levitation and transportation efficiency. The prototype sliding table was made of alumina ceramic (Al2O3) to increase machining accuracy and rigidity using a structure composed of a pair of guide rails with a triangular cross section and piezoelectric transducers. Two types of transducers were used: bolt-clamped Langevin transducers and bimorph transducers. A 40-mm long slider was designed to fit atop the two rail guides. Flexural standing waves and torsional standing waves were observed along the guide rails at resonance, and the levitation of the slider was obtained using the flexural mode even while the levitation distance was less than 10 pm. The levitation distance of the slider was measured while increasing the slider's weight. The levitation pressure, rigidity, and vertical displacement amplitude of the levitating slider thus were measured to be 6.7 kN/m(2), 3.0 kN/mu m/m(2), and less than 1 mu m, respectively. Noncontact transport of the slider was achieved using phased drive of the two transducers at either end of the vibrating guide rail. By controlling the phase difference, the slider transportation direction could be switched, and a maximum thrust of 13 mN was obtained
Subject Microelectromechanical Systems (MEMS)
Fluid Physics
Acoustics and Acoustical Devices; Waves
Keyword(s) Acoustic emission
Acoustic measurements
Acoustic propagation
Ceramics
Finite element methods
Levitation
Piezoelectric transducers
Prototypes
Rail transportation
Ultrasonic variables measurement
DOI - identifier 10.1109/TUFFC.2007.282
Copyright notice © 2007 IEEE
ISSN 0885-3010
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
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