计及磁路分布特性的电磁轴承解析模型建立与支撑性能影响因素研究  

Establishment of Analytical Model of Active Magnetic Bearing Considering Magnetic Circuit Distribution Characteristics and Study on Influencing Factors of Support Performance

作　　者：戈宝军[1] 杨子豪[1] 陶大军[1] 韩继超[1] 黄秋彤 Ge Baojun;Yang Zihao;Tao Dajun;Han Jichao;Huang Qiutong(National and Local Joint Engineering Research Center of Large Electric Machines and Heat Transfer Technology Harbin University of Science and Technology,Harbin 150080 China)

机构地区：[1]大型电机电气与传热技术国家地方联合工程研究中心(哈尔滨理工大学),哈尔滨150080

出　　处：《电工技术学报》2023年第8期2025-2035,2085,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777048)。

摘　　要：综合考虑磁路分布特性的电磁轴承解析模型是对电磁轴承优化设计的快速有效手段。该文通过计及铁心材料非线性磁导率、磁极边缘效应、磁场透入深度等影响因素,研究了磁极宽度对电磁轴承定子结构参数及其最大静态电磁力的影响,揭示了定子结构参数与磁路动态磁阻之间的规律,构建了计及磁路分布特性的电磁轴承解析模型。在此基础上,以异极径向电磁轴承结构参数为研究对象,分别以构建的解析模型和有限元法对其结构与最大电磁力及气隙磁通密度的影响规律进行计算对比,同时搭建了对应的实验平台进行验证分析,验证了解析模型的准确性和有效性。另一方面,基于构建的电磁轴承解析模型,揭示了定子极弧系数、励磁电流、气隙长度对于电磁轴承支撑性能的影响规律,为径向结构电磁轴承的设计及运行控制提供理论参考。Active magnetic bearing(AMB)has been widely used due to its advantages of no friction,controllable damping,and long service life.Currently,the research on the magnetic field distribution of AMB mainly focus on the performance characteristics of its fixed structure.It is necessary to establish an optimization and design judgment for the structure of the electromagnetic bearing based on the dynamic operation performance requirements and the influence of the structure according to relevant research results.Therefore,this paper proposes an accurate magnetic circuit analytical model of AMB considering the magnetic circuit distribution characteristics to analyze the influence of its structure on the AMB performance.Firstly,the concept of“pole arc coefficient”of motor design is introduced to define the stator structure of AMB,and the formula for pole area,winding area,and ampere turns by pole arc coefficient is defined.Secondly,the magnetic resistance of the air gap,stator,and rotor is calculated by considering the nonlinear permeability of core material,pole edge effect,magnetic field penetration depth,and other factors.Finally,a method to establish the electromagnetic force calculation model of AMB with different structures is proposed based on Maxwell's tension method.In order to verify the proposed analytical model,the corresponding two-dimensional finite element model is established to compare with the analytical model in terms of the air gap magnetic density and radial electromagnetic force.The calculation results of the two methods are entirely consistent,and the maximum error is less than 3.5%.On the other hand,a corresponding experimental platform has been built to verify the accuracy of the model.It is verified that the analytical model can meet the engineering requirements.The linear control strategy has a poor control effect on the current stiffness coefficient and displacement stiffness coefficient of AMB in the nonlinear section.Through the established analytical model,the influence of the pole arc coe

关 键 词：电磁轴承 解析模型 磁路分布 支撑性能 

分 类 号：TM14[电气工程—电工理论与新技术]