考虑笼型转子趋肤效应的无轴承异步电机矢量控制优化  

Vector control optimization of bearingless induction motor considering skin effect of cage rotor

作　　者：杨泽斌[1] 包春峰 孙晓东[2] 鲁江 陈浠 Yang Zebin;Bao Chunfeng;Sun Xiaodong;Lu Jiang;Chen Xi(College of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,China;Automotive Engineering Research Institute,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学电气信息工程学院,镇江212013 [2]江苏大学汽车工程研究院,镇江212013

出　　处：《农业工程学报》2019年第6期65-73,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51475214;51875261);江苏省自然科学基金项目(BK20170071; 20180046);江苏省"333"工程资助项目(BRA2017441);镇江市重点研发计划项目(GY2016003);江苏高校优势学科建设工程项目

摘　　要：针对无轴承异步电机启动和运行时趋肤效应带来的转子参数变化问题,该文提出了一种基于有限元计算和最小二乘原理的转子参数辨识方法。在分析电机悬浮机理和构建其有限元模型的基础上,计算了不同转子电流频率下转子的电阻、漏感值,获取趋肤系数变化曲线。基于数学模型推导分析了趋肤效应对电机转子磁场定向和悬浮控制的影响。采用最小二乘法对转子参数进行曲线拟合,提出一种考虑趋肤效应的无轴承异步电机矢量控制优化,通过拟合辨识获得转子参数的实时值,提高控制系统转矩和悬浮性能,并搭建电机试验平台进行试验验证。试验结果表明,与未考虑趋肤效应的控制方法相比,采用转子参数辨识能够缩短电机转速响应时间0.05 s,响应速度提高了25%,并且电机转子的x、y方向位移幅值降低50%左右,具有良好的转矩特性和悬浮性能。该研究可为无轴承异步电机控制系统优化提供参考。The bearingless induction motor(BIM)is a new type motor without contact and friction and has the function of rotation and suspension.The rotor parameters are important factors that affect the accuracy of the field orientation control strategy of BIM,however,they are easily affected by the skin effect during the process of starting and high speed running,which result in the changes of rotor resistance and leakage inductance.The variations of the rotor parameters will cause the deviation of field orientation and reduce the motor control performance.Aiming at these problems,a parameter identification method based on finite element calculation and least square method was proposed in this paper.Firstly,based on the analysis of suspension force generation principle of BIM,the 2 D finite element model of the motor was constructed and values of the rotor resistance and leakage inductance at different frequencies were calculated by the finite element simulation.Then,by reasoning on the mathematical model,the influence of skin effect on the rotor field orientation and suspension control of BIM was analyzed in detail.The results showed that the variations of rotor parameters caused by the skin effect would affect rotor flux field orientation and made the actual suspension force deviate from the given value.Next,the least square method was used to realize fast identification of the rotor parameters,and the function relationship between rotor parameters and current frequency was obtained.Based on this,a parameters identification model was presented and a BIM field-oriented control system with considering rotor skin effect was proposed.The real-time value of the rotor resistance was obtained through the identification module to correct the phase angle deviation of rotor flux linkage so as to completely decouple torque component and exciting component.Finally,in order to verify the accuracy and effectiveness of the proposed control strategy based on curve fitting identification by the least square method,the simulation of BIM v

关 键 词：电机 控制 优化 趋肤效应 悬浮力 有限元计算 最小二乘法 

分 类 号：TM346[电气工程—电机]