Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/409
Title: A standing wave-type noncontact linear ultrasonic motor
Authors: Hu, J
Li, G
Chan, HLW 
Choy, CL
Keywords: Piezoelectric materials
Vibration
Ultrasonic motors
Multilayer PZT vibrator
Issue Date: May-2001
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on ultrasonics, ferroelectrics, and frequency control, May 2001, v. 48, no. 3, p. 699-708 How to cite?
Journal: IEEE transactions on ultrasonics, ferroelectrics, and frequency control 
Abstract: In this study, a novel standing wave-type noncontact linear ultrasonic motor is proposed and analyzed. This linear ultrasonic motor uses a properly controlled ultrasonic standing wave to levitate and drive a slider. A prototype of the motor was constructed by using a wedge-shaped aluminum stator, which was placed horizontally and driven by a multilayer PZT vibrator. The levitation and motion of the slider were observed. Assuming that the driving force was generated by the turbulent acoustic streaming in the boundary air layer next to the bottom surface of the slider, a theoretical model was developed. The calculated characteristics of this motor were found to agree quite well with the experimental results. Based on the experimental and theoretical results, guidelines for increasing the displacement and speed of the slider were obtained. It was found that increasing the stator vibration displacement, or decreasing the gradient of the stator vibration velocity and the weight per unit area of the slider, led to an increase of the slider displacement. It was also found that increasing the amplitude and gradient of the stator vibration velocity, or decreasing the weight per unit area of the slider and the driving frequency, gave rise to an increase of the slider speed. There exists an optimum roughness of the bottom surface of the slider at which the slider speed has a maximum.
URI: http://hdl.handle.net/10397/409
ISSN: 0885-3010
EISSN: 1525-8955
DOI: 10.1109/58.920696
Rights: © 2001 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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