摘要
压电超声电机(ultrasonicmotor,USM)是一个具有闭环控制的机电耦合强非线性系统,在大功率情况下,会表现出明显的非线性现象.其非线性因素主要表现为:(1)定子与动子之间的接触非线性;(2)定子材料非线性;(3)温度、磨损等因素引起的缓变因素;(4)驱动电网络中的非线性因素.由于诸多非线性因素的存在,使得USM系统具有跳跃、滞后、共振频率漂移、死区和饱和等非线性现象,同时,给USM的非线性动力学建模带来了困难.而USM闭环控制要求有一个合理的动力学模型,因此,研究USM的非线性动力学建模是USM研究中的一个重要内容.针对超声电机系统中普遍存在的非线性因素和非线性动力学建模方法进行了归纳,对已有文献中有关超声电机非线性动力学的研究进行了总结,指出了有关该方面的若干研究方向.
Ultrasonic motor (USM) is a strongly nonlinear system with mechanical-electric coupling and closed-loop controls, especially in case of a powerful input. Four types of nonlinearities exist in such as a system: (1) nonlinearity due to the stator-rotor contact; (2) the material nonlinearity of the stator; (3) slow-changing factors due to temperature and wearing; (4) nonlinearity in the driving circuit. These nonlinear factors are related with various nonlinear phenomena, such as jump, hysteresis, drift of resonance frequency, dead zone and saturation. Furthermore, they lead to difficulties in the modeling of USM systems. As closed-loop controls of USM require valid dynamic models, the study of the modeling of USM systems becomes an important area in the research of USM. In this paper, common nonlinear factors in USM systems and their modeling methods are reviewed; published studies in the field of nonlinear dynamics in USM systems are summarized. At the end of the paper, some trends on nonlinear dynamics of ultrasonic motor are discussed.
出处
《力学进展》
EI
CSCD
北大核心
2005年第2期153-160,共8页
Advances in Mechanics
基金
国家自然科学基金(10472079)资助项目~~
