High-Frequency Loss Modeling of Amorphous and Nanocrystalline Cores With Different Air Gaps
High-Frequency Loss Modeling of Amorphous and Nanocrystalline Cores With Different Air Gaps
复制标题
不同气隙的非晶和纳米晶磁芯的高频损耗建模
DOI：
10.1109/tmag.2021.3081743
复制
发表时间：
2022
影响因子：
2.1
通讯作者：
Z. Wan
中科院分区：
文献类型：
--
作者：
Yongjian Li;Huan Liu;He Sun;Z. Wan
通常，气隙在磁芯中起重要作用。它将增强电抗器电感值的稳定性，提高电感器的功率密度，优化高频Transformer的性能。因此，研究气隙对磁芯性能的影响具有重要意义。基于一种新型的磁性能测试仪，对C型非晶（AMCC025）磁芯和纳米晶（F3CC0125）磁芯在不同频率激励下的动态磁性能进行了测试和分析。此外，还提出了考虑气隙附近边缘磁通的修正Steinmetz经验公式。用修正后的公式计算的磁性能与实测结果吻合较好。修正模型的平均预测误差控制在10%以内。计算和实验结果均表明，当气隙长度小于等效磁路长度的5%时，边缘磁通的影响可以忽略不计。特别是，频率相关的损失降低到一个最小值，然后增加相应的磁通密度的增加。修正后的损耗模型和计算结果对高频电感和Transformer磁芯的设计具有一定的参考价值。
In general, an air gap plays an important function in the magnetic core. It will enhance the stability of the inductance value of a reactor, increase the power density of the inductor, and optimize the properties of a high-frequency transformer. Hence, it is of great significance to study the influence of the air gap on the properties of magnetic cores. Based on a novel designed tester, the dynamic magnetic properties of the C-type amorphous (AMCC025) core and nanocrystalline (F3CC0125) core with different lengths of the air gaps are measured and analyzed when the cores are excited at different frequencies. In addition, the modified Steinmetz empirical formula which takes the fringing magnetic flux near the air gap into account is proposed. The calculated magnetic properties obtained from the modified formula show great agreement with the measured results. The average prediction error of the modified model is confined in 10%. Both the calculated and experimental results indicate that the influence of the fringing magnetic flux could be ignored when the length of the air gap is less than 5% length of the equivalent magnetic circuit. In particular, the frequency-dependent losses decrease to a minimum value and then increase with the increase in flux density accordingly. The modified loss model and results would be beneficial to the design of high-frequency inductors and transformer cores.