E-013

Parameter Identification of Ultrasonic Motors

Authors: Thomas Schulte, Norbert Fröhleke
Affiliations: Institute of Power Electronics and Electrical Drives
University of Paderborn, FB14/LEA
Warburger Str. 100, D-33098 Paderborn (Germany)
Phone: ++49-5251-603653, Fax: ++49-5251-603443
e-mail: schulte@lea.uni-paderborn.de

Abstract
Advanced control strategies for piezo drives require suitable parameter identification methods similar to conventional electrical motors. In this paper a parameter identification method for traveling wave type ultrasonic motors is presented based on investigations in the frequency domain. First, a model refinement with respect to the piezo ceramic energy conversion process is adopted which differs from conventional models of ultrasonic motors. Second, a parameter identification method is derived using the novel model approach which is then verified by simulations. The need for performing parameter identification in the practical operation range is discussed by simulation results. Finally the parameter identification method is applied to measured values and the results are discussed also with respect to the distribution of energy losses within the motor.