Academic And Experimental Research On The Revolving Travelling Wave Ultrasonic Motor

As novel concept actuators, ultrasonic motors have been attracting intensive attention at home and abroad with their outstanding features such as low speed and high torque, large holding torque, rapid response, light weight and compact sizes, simple structure, and no magnetic disturbance, etc. Traveling wave ultrasonic motors are especially attracting researchers'interest for their good controllability and flexible constructions.Theoretical model of the ultrasonic motor has been built. The mathematical description of the stator has been done. A new ultrasonic motor are presented in the dissertation, The structure and the operation principle of this motor has been discussed. The feasibility of the structure is proved in theory. Using PRO/E ANSYS FEM software, based on results of analyzing FEM model, the article discuss the influence to the eigenfrequency of the stator in different dimension parameters of the stator loop, different PZT thickness, The influence of tooth height along circumferential direction on eigenfrequency is analyzed. It offers a foundation for optimum design the structure of the stator.FEM equivalent circuit model of the ultrasonic motor has been built. The impedance matching design of the ultrasonic motor has been completed .The measuring PZT have been adhered to either side of the stator, measuring voltage changes of it making use of piezoelectric effect when the ultrasonic motor works. Furthermore, analyzing the characteristics of the ultrasonic motor in the resonant state.On the basis of theoretical research, an experimentation is made, by which we analyse the disadvantages impacting the work of traveling wave and test the relationship among pressing force, speed and pull. The results of the experimentation validate the correctness and reliability of theoretical analysis.