软铁磁材料Preisach模型与实验的差异,对仪器精度的影响

J. Eichler, M. Novák, M. Kosek
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引用次数: 3

摘要

Preisach滞回模型的实际应用是建立在正确识别材料特征加权函数的基础上的。权重函数的获得需要对二维通量密度函数(称为Everett曲面)进行两次偏导数,并通过特定的方法进行测量。由于导数需要精确测量,因此研究了可能的误差来源。主要方法是将实验结果与仿真结果进行比较。比较表明,励磁电流源的精度对埃弗雷特表面的质量有重要影响。数值积分漂移也起着重要的作用。励磁电流的随机或系统失效会在主磁滞回路上产生次要回路。对这些效应的模拟证实了这些预测。作为实际输出,发现通过重复测量可以减小激励误差。如果使用更合适的波源,可以消除漂移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Differences between Preisach model and experiment for soft ferromagnetic materials, effect of instrument accuracy
The practical use of Preisach hysteresis model is based on proper identification of weighting function that characterizes the material. Obtaining of the weighting function needs two partial derivations of two-dimensional flux density function, called Everett surface, measured by specific procedure. Since the derivatives require exact measurements, the possible source of errors are studied. Main method is to compare experimental results and simulation. The comparison showed that the excitation current source accuracy influences the quality of Everett surface. Also the numeric integration drift plays an important role. The random or systematic failure in excitation current results in the minor secondary loops on the main hysteresis loop. Simulations of these effects confirmed the predicitons. As practical output it was found that the errors in excitation can be reduced by repeated measurements. The drift can be eliminated, if a more suitable wavefrom is used.
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