摘要
为了提高损耗分离模型在谐波激励条件下的计算精度,该文对磁通畸变时铁磁材料的磁滞特性及损耗特性展开实验研究。研究发现,无论局部磁滞回环位于磁化环路还是反磁化环路,只要其相对于B=0轴的"高度"不变且幅值不变,则其对于动态磁化过程的影响是相同的,宏观上表现为引起相同大小的损耗增加;此外,无论是否出现局部磁滞回环,谐波磁滞损耗总会随着磁通密度波形畸变程度的变化而变化,此时传统计算方法已不再适用,必须对其进行改进。该文通过引入各次谐波幅值的加权方和根得到谐波磁滞损耗修正系数;此外,综合考虑集肤效应和去磁效应对涡流损耗的影响,并引入频率无关项对异常损耗项进行修正,从而建立可以有效考虑畸变磁通影响的改进损耗分离模型。通过对比多种谐波激励条件下磁损耗的测量值及计算值,验证所提改进损耗分离模型的准确性和可行性。
In order to improve the accuracy of the loss separation model under harmonic excitation, the hysteresis properties and loss properties of ferromagnetic materials under distorted flux was studied. It is found that, as long as the amplitude and the "height" of the minor hysteresis loop are constant, then regardless of the minor hysteresis loop appears in the magnetization loop or the demagnetization loop, it causes the same effect on the dynamic magnetization process, macroscopic causing equal increase of energy loss. Moreover, hysteresis loss under harmonic excitation always varies with the distorted flux density, whether there are minor hysteresis loops or not. The traditional model is no longer applicable, so it must be improved. In this paper, the correction factor was introduced to the hysteresis loss, which can be calculated by calculating the square root of the weighted quadratic sum of the amplitude of each harmonic. Furthermore, the influence of the skin effect and the demagnetization effect on the eddy current loss was taken into consider, and a frequency independent term was introduced to the excess loss. After that, the modified loss separation model which is suitable for arbitrary distorted flux can be obtained. As a result, the accuracy and feasibility of the modified loss separation model proposed in this paper were further verified by comparing the measured and predicted loss under various harmonic excitation.
作者
赵志刚
胡鑫剑
徐曼
马习纹
张鹏
ZHAO Zhigang;HU Xinjian;XU Man;MA Xiwen;ZHANG Peng(State Key Laboratory of Reliability and Intelligence of Electrical Equipment(Hebei University of Technology),Hongqiao District,Tianjin 300132,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province(Hebei University of Technology),Hongqiao District,Tianjin 300132,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第22期7490-7498,共9页
Proceedings of the CSEE
基金
国家自然科学基金(面上基金项目)(51677052)
河北省人才工程培养资助项目(A201902009)。
关键词
铁磁材料
谐波激励
畸变磁通
损耗分离
ferromagnetic materials
harmonic excitation
distorted flux density
loss separation
