Nano Archive

A non-contact linear bearing and actuator via ultrasonic levitation

Ide, Takeshi and Friend, James and Nakamura, Kentaro and Ueha, Sadayuki (2007) A non-contact linear bearing and actuator via ultrasonic levitation. Sensors and Actuators A: Physical, 135 (2). 740 - 747.

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Official URL: http://www.sciencedirect.com/science/article/B6THG...

Abstract

In this study, the design and testing of a linear bearing using near-field acoustic levitation (NFAL) phenomenon was performed. A pair of Langevin transducers placed at either end of a beam with either a right-angle V-shaped or Λ-shaped cross-section was used to excite and absorb ultrasonic flexural vibrations transmitted along the length of the beam from one transducer to the other. The beam was used as a guide rail, supporting a slider formed from a short length of beam with the same cross-section. This arrangement provides a small and inexpensive non-contact bearing with magnetic field immunity and without generating a magnetic field, both useful characteristics for clean room and precision actuators. The slider was levitated by the vibration of the beam up to 100 μm, and was moved successfully in either direction by traveling waves transmitted along the guide rail. In a 300-mm long prototype, objects up to 160 g (60.5 kg/m2) were levitated and transported. A transportation speed of 138 mm/s was obtained for a slider of 90 g. The stiffness of the levitation was found to be 1.1 N/μm/m2 for this prototype.

Item Type:Article
Uncontrolled Keywords:Acoustic levitation; Linear actuator; Piezoelectric actuator; Clean room; Non-contact actuator
Subjects:Analytical Science > Nanotechnology for sensing and actuating
ID Code:4813
Deposited By:SPI
Deposited On:06 May 2009 10:29
Last Modified:06 May 2009 10:29

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