Design and Additive Manufacturing of Multipermeability Magnetic Cores
Design and Additive Manufacturing of Multipermeability Magnetic Cores
复制标题
多重磁导率磁芯的设计与增材制造
DOI：
10.1109/tia.2018.2819963
复制
发表时间：
2018
影响因子：
4.4
通讯作者：
G. Lu
中科院分区：
文献类型：
--
作者：
Lanbing Liu;C. Ding;Shengchang Lu;T. Ge;Yi Yan;Y. Mei;K. Ngo;G. Lu
常规磁芯中磁通量的不均匀分布限制了磁性部件的功率密度的提高。通过制造由具有不同导磁率的材料组成的磁芯（此后称为多导磁率磁芯），可以实现更均匀的通量分布，而无需磁芯和绕组的复杂配置和几何形状。本文设计了一种三环环形磁芯，通过从内环到外环增加磁导率，在三个环中的每一个环中产生磁通均匀性因子α，定义为Bmin/Bmax。在电感相同的情况下，三磁导率环形磁芯的体积比单磁导率环形磁芯的体积小。为了方便制备多导磁率磁芯，探索了一种商业化的多挤出机浆料挤出3D打印机，将不同的磁性浆料加工成3D结构。磁性浆料是在我们实验室配制的。开发了两种类型的磁性浆料系统，即高温（>900 °C）无压可烧结铁氧体和低温（<250 °C）无压可固化铁粉，并在3D打印机中进行了测试。通过改变两种材料系统中的磁性/有机成分，我们生产出了与3D打印机兼容的浆料，并且可以加工成相对磁导率在20到70之间的芯材料。在相同的尺寸下，3D打印的三磁导率环形磁芯比单磁导率磁芯具有更高的电感。
Uneven distribution of magnetic flux in a conventional magnetic core limits the improvement of power density of the magnetic component. By making a magnetic core comprised of materials with different permeabilities, henceforth called multipermeability core, a more uniform flux distribution can be achieved without complex configuration and geometry of the core and winding. In this paper, we designed a three-ring toroid core to produce a flux uniformity factor, α, defined as Bmin/Bmax, in each of the three rings by increasing permeability from the inner to outer ring. With the same inductance, volume of the three-permeability toroid core was smaller than that of a single-permeability toroid core. For ease of fabricating multipermeability magnetic cores, a commercial multiextruder paste-extrusion 3-D printer was explored to process different magnetic pastes into 3-D structures. The magnetic pastes were formulated in our laboratory. Two types of magnetic paste systems, a high-temperature (>900 °C) pressure-less sinterable ferrite and a low-temperature (<250 °C) pressure-less curable powdered-iron, were developed and tested in the 3-D printer. By varying the magnetic/organic composition in each of the two material systems, we produced pastes that are compatible with the 3-D printer and can be processed into core materials with relative permeability ranging from 20 to 70. With the same dimensions, a 3-D-printed three-permeability toroid core had higher inductance than a single-permeability core.