摘 要:对双转子电机定子表面质点运动轨迹进行了仿真,直观地描述了电机运行机理。应用Timoshenko梁振动理论计算了运动轨迹的椭圆倾角,根据倾角和双压电晶片的位移描述方程,计算出定子的纵向振幅,再结合赫兹接触理论,得出一定预压力下定转子接触区域宽度,进而得出双转子柱体超声波电机的转矩模型。计算出了相同尺寸单双转子电机的倾角和转矩,对比得到双转子电机的转矩比单转子的大两倍,证明了双转子结构在转矩性能上的优点,为双转子柱体超声波电机的结构优化设计提供了理论基础。 关键词:超声波电机;双转子;椭圆倾角;输出转矩
Abstract: To achieve the operational efficiency maximization of ultrasonic motor system,this paper analyzed optimum control of the ultrasonic motor system’s efficiency including driving circuit,while the speed closed-loop control performance was ensured.Based on regulating characteristics of open-loop speed and fuzzy control,two optimum control methods for adjusting the changing step-length of driving voltage amplitude,to shorten the elapsed time of efficiency optimization process and to improve the general operational efficiency of motor system and the speed closed-loop control performance,were also analyzed.The experiment show the effectiveness of the methods mentioned in this paper. Key Words: Ultrasonic Motor;System Efficiency;Optimum Control
|