Optimization of travelling wave ultrasonic motors using a three-dimensional analysis of the contact mechanism at the stator-rotor interface

摘要

The present paper investigates optimization rules and new design methodologies dealing with the contact mechanics in rotative travelling wave ultrasonic motors (TWUM). The proposed approaches focus on the design of the rotor, including the friction layer that is usually deposited onto its lower surface, while the stator is supposed to be preliminary designed. Contact aspects such as the transmission of mechanical power as well as the wear mechanism of the friction layer are investigated, according to the analysis of the stator-rotor contact mechanics in both hoop and radial directions.