Wear evaluation model of a linear piezoelectric ultrasonic motor considering temperature effect

Abstract

Ultrasonic motor relies on interface friction to drive the slider movement. During continuous operation, the contact surfaces between the stator and slider are worn, which will affect the performance and service life of the motor. A novel wear evaluation model considering temperature effect is established to estimate the remaining life and performance for a linear piezoelectric ultrasonic motor. The interactions of temperature with resonance frequency and material parameters are considered. The relationship between wear volume and preload as well as the variations of surface roughness parameters are taken into account. An experimental platform is built to identify the critical parameters and verify the accuracy of this model. The results show that the developed model can not only predict the temperature and service life, but also evaluate the performance of the motor, which can provide valuable guidance for motor design and optimization.

Keywords: Dynamic model; Life prediction; Linear piezoelectric ultrasonic motor; Surface roughness; Temperature interaction.