动态工况下超声电机转速及效率优化控制方法  

Speed and Efficiency Optimization Control Method for Ultrasonic Motor Under Dynamic Conditions

作　　者：蔡春晨 毛雪飞 赵雷 陈振[1] 李震[1] CAI Chunchen;MAO Xuefei;ZHAO Lei;CHEN Zhen;LI Zhen(School of Automation,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学自动化学院,北京100081

出　　处：《电气传动》2022年第16期19-25,共7页Electric Drive

摘　　要：针对超声电机工作效率过低限制系统续航能力、影响电机谐振和动态特性的问题,设计一种动态工况下转速及效率优化控制方法。通过分析电机驱动电路工作特性,确定电机的两个控制量,并对基于驱动电压有效值的效率反馈方式进行理论证明。然后根据电压-效率-频率特性设计最大效率点跟踪(MEPT)算法,并基于最小二乘法的多项式曲面拟合方法计算频率更新步长。最后通过仿真对提出的控制方法进行验证,并与现有效率优化算法进行对比,结果表明,此方法能有效提升电机工作效率,并保证动态工况下效率优化算法的稳定性。Aiming at the problems that the working efficiency of ultrasonic motor is too low,which limits the working endurance of the system and affects the resonant and dynamic characteristics of the motor,a speed and efficiency optimization bivariate control method under dynamic conditions was designed.First,the two control variables of the motor were determined by analyzing the working characteristics of the motor drive circuit.Second,the efficiency feedback method based on the effective value of the drive voltage was theoretically proved.And then according to the voltage-efficiency-frequency characteristics of the motor,the maximum efficiency point tracking(MEPT)algorithm was designed,and the frequency update step was calculated by the polynomial surface fitting based least squares method.Finally,the proposed control method was verified and compared with the existing efficiency optimization algorithm by simulation.The results show that this method can effectively improve the efficiency of the motor and ensure the stability of the efficiency optimization algorithm under dynamic conditions.

关 键 词：超声电机 双变量控制 效率优化控制 最小二乘法 曲面拟合 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]