Radial Traveling Wave Ultrasonic Motor Design
Y. Bernard1, C. Hernandez2, A. Razek1
1 LGEP / CNRS UMR 8507, Supelec, Université Paris VI; Université Paris XI, Gif sur Yvette, France
2 Université de Savoie, Annecy-le-Vieux, France
This paper investigates to employ the theory of radial vibration for the construction of an ultrasonic motor. The dynamics of this type of motor are based on the simultaneous excitation of two vibration modes on a piezoelectric ring shifted in space and time in order to obtain a mechanical traveling wave capable to produce rotary motion. This article begins with a reminder of the physics of radial vibrations as an introduction to the different considerations undertaken in the design of a radial traveling wave motor. In this paper we discuss aspects like the electrode geometrical distribution and the impact on the quality of the resulting traveling wave. We conclude with a comparison of experimental and finite elements simulation values of the obtained resonant frequencies.
This paper describes an ultrasonic motor using radial vibration to create a traveling wave on a piezoelectric ring polarized in the radial direction to produce rotary motion. Two non-axisymmetric vibration modes shifted in space and time are used to obtain the mechanical traveling wave. Mechanical equations are solved to obtain the non-axisymmetric modes frequencies. The frequencies are verified by the means of impedance measurement. One of these frequencies is chosen to generate the traveling ultrasonic wave. The electrode parameters (position, size) are tested experimentally. The obtained displacement (vibration magnitude) is measured using a vibrometer. Finally, the device is tested with a rotor around the stator. The working principal is shown.
ACTUATOR 2014 Manuskript Poster 61
Publication date: 26/05/2015
Manuscript Poster 61 published in Conference Proceedings ACTUATOR 2014
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