基于频率跟踪的液体媒质超声波电机转速模糊控制系统  

Speed Fuzzy Control of Ultrasonic Motor Driving Fluid Directly Based on Frequency Tracking

作　　者：李斌[1] 夏长亮[1] 俞卫[1] 史婷娜[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《电工技术学报》2007年第12期34-38,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50207006);高等学校博士学科点专项科研基金(20040056021);天津市自然科学基金(05YFJMJC11300)资助项目

摘　　要：针对液体媒质超声波电机结构和激励方式的特点,提出一种基于频率跟踪的转速辨识方法。利用超声波电机定子等效电路,分析了驱动电压、支路电流相位差与电机驱动频率、谐振频率的频率差之间的关系,结果表明此相位差描述了电机的振动状态,可作为转速辨识值。控制系统采用调频调速策略,模糊控制器根据速度给定值和辨识值的偏差和偏差变化量调节驱动电压的频率。实验证明,系统能够补偿液体参数改变引起的电机谐振频率的变化,快速准确地跟踪速度指令。Concerning with the structure and excitation method of the ultrasonic motor driving fluid directly, a method of identify speed based on frequency tracking was presented. Based on the equivalent circuit of the motor＇s stator, the relationship between phase differences of driving voltage and current and frequency differences of driving frequency and resonant frequency is analyzed in the paper, the result shows that, the phase differences represent the vibration state and can be treated as speed feedback. The control system adopted the VFVV strategy, and fuzzy controller regulated the frequency of the motor＇s driving voltage in accordance to speed error and its differential. The change of resonant frequency caused by the variety of fluid parameter is compensated by the system. Speed instruction is tracked quickly and exactly.

关 键 词：超声波电机 液体媒质 转速辨识 等效电路 模糊控制 

分 类 号：TM38[电气工程—电机]