Parametrical optimisation of ultrasonic motors

Abstract The present paper introduces a new optimisation approach for the stator of travelling wave ultrasonic motors. The optimisation approach is based on a model of the ultrasonic motor that includes stator and rotor models as well as a simplified rotor–stator interface model. The motor model is a parametrical one, thus enabling the selection and optimisation of both the stator geometry and the material parameters. Previous to the optimisation process, the motor model is briefly described and experimentally validated. This validation is performed for both the stator model and the motor model. A set of motor performance indicators (the piezoelectric coupling coefficient, the efficiency, and the output power) are also introduced as objective functions in the optimisation process.

[1]  S. Ueha,et al.  Ultrasonic motors : theory and applications , 1993 .

[2]  Sadayuki Ueha,et al.  Revolution Speed Characteristics of an Ultrasonic Motor Estimated from the Pressure Distribution of the Rotor , 1992 .

[3]  K. Uchino,et al.  Loss mechanisms in piezoelectrics: how to measure different losses separately , 2001, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[4]  Dimitris A. Saravanos,et al.  Exact free‐vibration analysis of laminated plates with embedded piezoelectric layers , 1995 .

[5]  T. Ikeda.  Fundamentals of piezoelectricity , 1990 .

[6]  J.L. Pons,et al.  Novel modeling technique for the stator of traveling wave ultrasonic motors , 2003, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[7]  W. P. Mason,et al.  Piezoelectric Crystals and Their Applications to Ultrasonics , 1951 .

[8]  H. Hirata,et al.  Design of a traveling wave type ultrasonic motor , 1995, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[9]  N.W. Hagood,et al.  Modeling of a piezoelectric rotary ultrasonic motor , 1995, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[10]  D. S. Stutts,et al.  The Dynamics of an Annular Piezoelectric Motor Stator , 1997 .

[11]  Vijay K. Varadan,et al.  Detailed study of electromechanical fields in piezolaminates , 1999, Smart Structures.

[12]  Toshiiku Sashida,et al.  An Introduction to Ultrasonic Motors , 1994 .

[13]  Kenji Uchino,et al.  High Power Characterization of Piezoelectric Materials , 1998 .

[14]  L. E. Cross,et al.  Electromechanical coupling and output efficiency of piezoelectric bending actuators , 1999, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[15]  Kenji Uchino,et al.  Recent trend of piezoelectric actuator developments , 1999, MHS'99. Proceedings of 1999 International Symposium on Micromechatronics and Human Science (Cat. No.99TH8478).

[16]  Rosario Humberto Rodríguez Del.  Modelado, diseño y control de motores piezoeléctricos de onda viajera: su aplicación a manos protésicas y robóticas , 2002 .

[17]  Peter Hagedorn,et al.  TRAVELLING WAVE ULTRASONIC MOTORS, PART I: WORKING PRINCIPLE .AND MATHEMATICAL MODELLING OF THE STATOR , 1992 .