考虑饱和的开关磁阻电机径向电磁力解析建模

Analytical Modeling of Radial Electromagnetic Force for Switched Reluctance Motor Considering Saturation Effect

摘要:

为了对开关磁阻电机径向电磁力进行快速计算和分析，提出了一种开关磁阻电机电磁力的解析计算模型.该模型考虑了饱和的影响，且能够反映电磁力的分布特征.基于磁通管法推导了磁动势和等效磁导，通过磁势乘磁导建立气隙磁场模型；分析了饱和对气隙磁场的影响，并引入修正系数对模型进行修正；基于麦克斯韦张量法建立了径向分布电磁力解析计算模型，并通过有限元方法证明了该解析模型的准确性.模型可以反映电磁力与电机结构的关系，适合电机设计和改进，以及振动噪声研究时快速计算电磁力.

关键词:开关磁阻电机; 解析模型; 等效气隙; 饱和; 分布电磁力

Abstract:

A novel analytical model of electromagnetic force for switched reluctance motor (SRM) was presented to calculate and analyze the radial electromagnetic force quickly. The model takes the influence of saturation into account, and reflects the distributing characteristics of electromagnetic force for the SRM. The magnetomotive force (MMF) and airgap equivalent permeance was computed based on the flux tube method, and an analytical model of airgap magnetic field was established based on the magnetomotive forcepermeance theory. The influence of saturation on SRM was analyzed, and the previous airgap magnetic field model was improved by considering the saturation effect. A mathematical model of radial distributive electromagnetic force was built based on the Maxwell’s tensor method, and the accuracy of the model was validated by comparing with the simulation results. The proposed model establishes the relationship between the electromagnetic force and the motor parameters, which is suitable for fast computation of the radial electromagnetic force in the design stage and analysis of the NVH behavior of the SRM.

Key words:switched seluctance motor(SRM); analytical model; equivalent air-gap; saturation effect; distributive electromagnetic force