Research On Drive & Control Of Ultrasonic Motor Based On DDS Technique

Ultrosonic Motor(USM) has three control methods: frequency modulation, voltage modulation and phase difference modulation, and the driving system is very important to the performance of the motor, most of existing driving systems at current domestic have single function and low calculation precision, which can't reach the precise control requirments. It is of great practical significance to design a high-performance, accurate, rapid response driving system.A diving system of USM based on Direct Digital Frequency Synthesis(DDS) technique has been developed to the dirving desire of the USM after researching the current drving technique at home and abroad. Firstly, the system hardware design has been finished after presenting the principle and characteristics of DDS, which takes AT89LS52 as the controller, two-piece of AD9854 as the signal generator, MAX274 as the filter, PA85 as the core of the power amplification and photoelectric encoder as the feedback equipment. Secondly, the system software has been designed, which can realize several signal modulation mode such as FM, AM, PM, FSK, BPSK. Three ways of speed regulation are realized including frequency modulation, voltage modulation and phase difference modulation.It has been proved that the system meets the design specifications after the system's debug and analysis. The research presented in the thesis offers help to the current study of drive and control system.