A generalized electromechanical coupled model of standing-wave linear ultrasonic motors and its nonlinear version

For the systematization of research on standing-wave linear ultrasonic motors (SWLUMs), this work develops a generalized electromechanical coupled model for characterizing SWLUMs. The proposed model focuses on dealing with modeling the generalized two-stage energy conversion in SWLUMs. The first-stage energy conversion is modeled by a four-terminal equivalent circuit model, which with a phase shifter and a couple of electromechanical transformers based on the electromechanical analogy method. The second-stage energy conversion is modeled by a physics -based, friction-driven system, involving contact nonlinearities between the stator and the mover. Furthermore, the effectiveness of this model and its further extension considering nonlinear vi-brations of piezoelectric transducer (stator) are exemplified and discussed by a classical SWLUM with V-configuration stator, thereby indicating that the presented generalized model is valuable and pragmatic in simulating and characterizing SWLUMs both in electrical and mechanical domains.

Automated summary

This work develops a generalized electromechanical coupled model for characterizing standing-wave linear ultrasonic motors (SWLUMs). The model includes a four-terminal equivalent circuit model for the first-stage energy conversion and a friction-driven system for the second-stage energy conversion. The effectiveness of the model is demonstrated through simulations and discussions on a classical SWLUM.