MnZn-based ferrite materials like the EPCOS N87 or K2004 are commonly used as magnetic cores in inductive power transfer (IPT) applications. However, the performance and the reliability of IPT systems are limited by ferrite's intrinsic brittleness and low flux density saturation point. In this article, a study of nanocrystalline-ribbon-based magnetic cores for IPT applications is presented. Finite element method (FEM) simulations and experimental validations are used to compare both materials. The design of ultrathin laminated cores such as nanocrystalline ribbons for IPT systems is presented. Compared to ferrite, nanocrystalline ribbon is mechanically more robust; it has a higher magnetic permeability and a higher saturation point. Results show that nanocrystalline ribbon cores achieve more than a $\text{50}\%$ volume reduction when used in IPT pads. This is due to nanocrystalline's high saturation point. However, a compromise arises as the total power loss increases due to the induced eddy currents in the core. The reduction of efficiency can be mitigated by special geometrical designs of the nanocrystalline ribbon cores. A 6.6-kW IPT system has been built for experimental validation of the design methodology.

中文翻译：

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用于极化感应功率传输垫的纳米晶带状磁芯的可行性研究

诸如 EPCOS N87 或 K2004 之类的 MnZn 基铁氧体材料通常用作感应功率传输 (IPT) 应用中的磁芯。然而，IPT 系统的性能和可靠性受到铁氧体固有脆性和低磁通密度饱和点的限制。在本文中，介绍了用于 IPT 应用的基于纳米晶带的磁芯的研究。有限元方法 (FEM) 模拟和实验验证用于比较两种材料。介绍了用于 IPT 系统的超薄叠片铁芯（如纳米晶带）的设计。与铁氧体相比，纳米晶带在机械上更坚固；它具有较高的磁导率和较高的饱和点。结果表明，当用于 IPT 焊盘时，纳米晶带状核实现了超过 $\text{50}\%$ 的体积减小。这是由于纳米晶体的高饱和点。然而，当总功率损耗由于磁芯中的感应涡流而增加时，就会出现折衷。纳米晶带芯的特殊几何设计可以减轻效率的降低。已经建立了一个 6.6 千瓦的 IPT 系统，用于设计方法的实验验证。