Simulation Investigation On Averaged Model Of Two-phase Traveling Wave Ultrasonic Motor System

The ultrasonic motor is a new motor whose internal structure and energy transferring mechanisms are different from the traditional electromagnetic motors, with a compact structure,torque output of high density, non-electromagnetic interference and noise,etc.,especially suitable for high-precision parts and special environment.However, the inherent non-linear problems and control technology lagged behind limit its application in more areas. In order to solve nonlinear problems and improve control performance, ultrasonic motor system model is studied. Etablishing the necessary mathematical model and simulation analysis is very important to improve the performance of ultrasonic motor drive control system.In this paper, the traveling wave ultrasonic motor with a good application prospect is studied. The research on ultrasonic motor system model is reviewed; based on the existing mathematical model,the averaged model with the ultrasonic motor drive circuit system is established by generalizing averaging method and the system's dynamic properties are reflected by the time-varying fundamental Fourier coefficients; based on the principle of mechanical and electrical conversion, the resonant converter model is facilitated for optimal control; the analytical method is applied to the module of inverter and stator/rotor-contact for the establishment of the averaged stator and the averaged stator/rotor-contact model; on this basis,ultrasonic motor voltage and torque of the neural network control model with two-phase duty cycle, phase difference, frequency are set up and simulated.; then it will become the foundation of the neural network inverse model and real-time closed-loop control system.