考虑磁饱和的共悬浮绕组式无轴承开关磁阻电机径向力模型  

Radial force model of a bearingless switched reluctance motor with sharing suspension windings considering magnetic saturation

作　　者：王喜莲[1] 崔睿珍 郝毅 刘岳楠 赵鹏宇 WANG Xi-lian;CUI Rui-zhen;HAO Yi;LIU Yue-nan;ZHAO Peng-yu(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《电机与控制学报》2021年第6期46-53,共8页Electric Machines and Control

基　　金：国家自然科学基金(50907004)。

摘　　要：无轴承开关磁阻电机一般工作在磁路饱和状态,其径向力解析模型的建立是实现稳定悬浮控制的基础。针对无轴承开关磁阻电机径向力的严重非线性问题,提出了一种用一次线性关系描述材料磁化特性的拟合方法,利用该方法针对一台共悬浮绕组式无轴承开关磁阻电机求取了气隙磁场强度,并利用麦克斯韦应力法推导了考虑磁饱和的全周期径向力解析模型。搭建了样机的有限元模型并进行了仿真分析,将仿真结果与线性模型、考虑磁饱和的径向力解析模型计算结果比较,验证了在大电流饱和状态下该模型的准确性。所建的径向力解析模型无需分段,即可在整个电机工作区计算电机径向力,将其应用于控制系统中具有计算速度快、通用性强的特点,为无轴承开关磁阻电机控制策略的研究奠定了理论基础。Bearingless switched reluctance motors(BSRM)generally work in the region of magnetic saturation,and the establishment of analytical model is the basis of the stable suspension control.Aimed at the serious non-linearity of the radial force of the bearingless reluctance motor,a fitting method for describing the magnetization characteristics of the material with a linear relationship is proposed.This method was used to obtain the air gap magnetic field strength for a sharing suspension windings BSRM,and the full-period radial force analytic model considering magnetic saturation was derived by Maxwell stress tensor method.The finite element model of the prototype was built and the simulation analysis was performed.The simulation results are compared with the calculation results of the linear model and the analytical model considering magnetic saturation,which verifies the accuracy of the model under the state of large current saturation.The radial force analytical model established can calculate the radial force of the motor accurately in the entire motor working area without segmentation.It has the characteristics of fast calculation speed and high universality when using in a control scheme,which lays a theoretical foundation for the research of BSRM control strategies.

关 键 词：无轴承开关磁阻电机 共悬浮绕组式 径向力 磁饱和 磁化特性拟合 解析模型 

分 类 号：TM352[电气工程—电机]