J. Phys. IV France 02 (1992) C1-381-C1-385
ANALYSE D'UN MOTEUR ULTRASONORE PIÉZOÉLECTRIQUE À L'AIDE DE LA MODÉLISATIONF. CLAEYSSEN1, R. LE LETTY1, B. HAMONIC2 and R. BOSSUT2
1 CEDRAT RECHERCHE, 10 Ch. du Pré Carré, ZIRST, F-38240 Meylan, France
2 Institut Supérieur d'Electronique du Nord, Laboratoire d'Acoustique, 41 Bd Vauban, F-59046 Lille cedex, France
Ultrasonic motors use a frictional force produced by high frequency vibrations created by the piezoelectric effect of the stator, to drive the rotor. These devices have been widely studied especially in Japan. A stator of a piezoelectric ultrasonic rotating motor, which uses Lamb waves vibrations, has been modelled using the finite element code ATILA. It takes into account three dimensional piezoelectric effects and electrical excitations. ATILA permits the computation of the resonance frequency and the effective coupling coefficient of each vibrational mode, the electrical impedance and the elliptical displacement field. The governing electromechanical coupling has been determined. Consequently, the selection of active material and stator geometry may be optimized to provide an improved transduction efficiency.
© EDP Sciences 1992