Dynamic modeling and analysis of a bonded-type ultrasonic motor considering the load transfer in adhesive interlayer

Abstract

This paper proposes a dynamic numerical model for the bonded-type ultrasonic motor considering the load transfer in the adhesive interlayer between the piezoceramics and the host structure. The finite element method and an extended shear-lag theory are used to derive the dynamic equation. The effectiveness of this model is validated by comparing the dynamic response of the stator in frequency and time domains between simulation and experimental results, with a maximum relative error of less than 4%. The dynamic load transfer in the adhesive interlayer is analyzed when the stator is excited electrically, and the results show that the interfacial load transfer is concentrated near the bonding edges. The effects of partially bonded piezoceramics on the dynamic characteristics of the motor are investigated, where two partially bonded conditions including edge and inner debonded cases are considered. The results indicate that both the inner and edge debonded conditions could reduce the vibration amplitude of the stator and then reduce the output performance of the motor.

A U-shaped and alternately driven ultrasonic motor using three bending coupled modes

“…The PZT ceramic is pasted on the metal substrate by epoxy resin adhesive. The PZT ceramic plate can be arranged according to the structure of metal substrate, and its structure is easier to achieve miniaturization [16][17][18]. For instance, Tanoue and Morita proposed a quadruped-driven linear USM that only used three PZT ceramics to achieve stepping motion; three PZT ceramics in d 31 mode were pasted on upper surface of the stator; the maximum length and velocity were 20 mm and 258 mm s −1 , respectively [19].…”