考虑硅钢片二维矢量磁特性的复数E&S模型

电工材料电磁特性的精细模拟是决定电工装备电磁场分析与损耗计算正确与否的关键因素之一。提出了一种能够描述硅钢片二维矢量磁特性的复数E&S模型,该模型既能够考虑交变磁化,又能够考虑旋转磁化的影响。基于硅钢片二维磁特性测量实验,提出了利用1个周期内磁能密度平均值计算模型中有效磁阻系数,利用磁滞损耗密度计算有效磁滞系数的方法。推导了结合复数E&S模型的磁场有限元分析公式,并以环形铁心模型为例,将复数E&S模型与传统E&S模型的计算结果进行了对比研究,指出复数E&S模型与有限元结合时既能够节省计算时间又能够保证材料特性模拟的准确性,是一种更适用于工程应用的矢量磁特性模型。

A Complex E&S Model Considering 2D Vector Magnetic Properties of Silicon Steel Sheet

The accurate modeling of electromagnetic characteristic of electric steel sheet has a significant effect on the magnetic field analysis and loss computation for electrical equipment.In this paper,a complex E&S magnetic properties model describing the 2D vector magnetic property of silicon steel sheet under both alternating magnetic field and rotating magnetic field was proposed.Based on 2D magnetic property measurement data,the effective magnetic reluctivity coefficients in this model were calculated according to average magnetic energy density in one time period,and the effective magnetic hysteresis coefficients were calculated from magnetic hysteresis loss density.The finite element analysis(FEA) combined with proposed magnetic property model was derived.Taking the ring iron core computation model as example,the effectiveness of the complex E&S model was compared with traditional E&S model.It is shown that the proposed model not only can save computing time but also can guarantee the accuracy of the calculation when combined with FEA,and is more suitable for engineering applications.