Geometrical control of eddy currents in additively manufactured Fe-Si
Geometrical control of eddy currents in additively manufactured Fe-Si
复制标题
增材制造 Fe-Si 中涡流的几何控制
DOI：
10.1016/j.matdes.2023.112002
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发表时间：
2023
影响因子：
8.4
通讯作者：
Goodall A
中科院分区：
文献类型：
--
作者：
Goodall A
增材制造使具有优异软磁性能的高硅电工钢的加工成为可能。在整体形式中，涡流造成的铁芯损耗太大，无法用于高频电机，因此需要减少涡流的策略。增材制造提供了高零件复杂性，并提供了在材料内的横截面图案的机会，以限制涡流的产生。本研究研究了几种设计，包括一种新颖的六角形图案，其涡流损耗系数最低，为0.0005，小于体材的25%，涡流损耗系数为0.0021。热处理会增加涡流损耗，这表明对于高频机器来说，在建成状态下使用材料可能是有益的。物理样品与其预期的几何形状进行了比较，结果表明，与模拟相比，这些复杂横截面存在缺陷，导致涡流增加，但可以通过实验经历较小损失的替代设计方法提高几何精度。这些新颖的横截面设计可以通过增材制造实现到具有3D磁通路径的电机中，为电气工程师在追求更高功率密度的机器中设计新的电机架构提供了更大的灵活性。
Additive manufacturing has enabled the processing of high silicon electrical steels which have excellent soft magnetic properties. In bulk form, core losses as a result of eddy currents would be too large to allow their use in high-frequency electrical machines, therefore strategies are needed to reduce eddy currents. Additive manufacturing affords high part complexity and provides the opportunity for cross sectional patterns within the material to limit eddy current generation. This study investigates several designs, including a novel hexagonal pattern which is shown to have the lowest eddy current loss coefficient of 0.0005, less than 25% of the bulk material which has an eddy current loss coefficient of 0.0021. Heat treatment is shown to increase the eddy current losses, demonstrating that for high-frequency machines, it may be beneficial to use the material in the as-built state. Physical samples were compared to their intended geometries, showing there are defects in these complex cross sections causing increased eddy currents when compared to simulations, but that geometrical accuracy can be improved by alternative design methodology which experimentally experiences smaller losses. These novel cross sectional designs may be implemented into an electric machine that has a 3D magnetic flux pathway enabled by additive manufacturing, affording more flexibility for electrical engineers to design new motor architectures in the pursuit of higher power density machines.