变温条件下Energetic磁滞模型参数修正方法

Correction Method of Energetic Hysteresis Model Parameters Under Variable Temperature Conditions

铁磁材料的磁滞特性存在温度依赖性,导致铁芯类设备的性能会受到温度的影响。但是现有的Energetic磁滞模型无法对温度进行有效表征,导致损耗计算结果误差较大。为此,首先研究了Energetic各个模型参数对磁滞回形状特征值的影响,分析了铁磁材料磁滞特性的温度依赖性。然后在采用公式法进行参数辨识的基础上,提取不同温度下磁滞回线的形状特征值,并引入居里温度和临界指数等系数,提出了各形状特征值关于温度的表达式。进一步将特征值表达式与各模型参数的辨识公式相结合,提出了考虑温度特性的模型参数辨识方法,建立了一种变温条件下的修正Energetic磁滞模型。最后,以纳米晶合金的极限磁滞回线测量结果为例,模拟该材料在各温度下的磁滞回线,并与多组测量值进行对比,验证了模型的准确性和可行性。

The hysteresis characteristics of ferromagnetic materials are temperature-dependent,thus the performance of iron core equipment is affected by temperature.However,the existing Energetic hysteresis models can not effectively characterize the temperature,resulting in a significant error in the loss calculation.Therefore,the influence of each pa-rameter of the Energetic hysteresis model on the shape of hysteresis loop is firstly studied in this paper.The magnetic properties and temperature dependence of the ferromagnetic material are analyzed.Then,based on the parameter identifi-cation by formula method,the shape eigenvalues of hysteresis loops at different temperatures are extracted.The Curie temperature and critical exponent coefficients are introduced,and the expressions of the shape eigenvalues with respect to temperature are proposed.The expressions of eigenvalues are combined with the identification formulas of various model parameters.Moreover,the model parameter identification method considering temperature characteristics is proposed and a modified Energetic hysteresis model under variable temperature conditions is established.Finally,the hysteresis loop of the material at various temperatures was simulated and compared with multiple sets of measured values while taking the measurement results of the ultimate hysteresis loop of a nanocrystalline alloy as an example,which verified the consist-ence and feasibility of the proposed model.