Purpose

This paper aims to propose and establish a set of new benchmark models to investigate and confidently validate the modeling and prediction of total stray-field loss inside magnetic and non-magnetic components under harmonics-direct current (HDC) hybrid excitations. As a new member-set (P21^e) of the testing electromagnetic analysis methods Problem 21 Family, the focus is on efficient analysis methods and accurate material property modeling under complex excitations.

Design/methodology/approach

This P21^e-based benchmarking covers the design of new benchmark models with magnetic flux compensation, the establishment of a new benchmark measurement system with HDC hybrid excitation, the formulation of the testing program (such as defined Cases I–V) and the measurement and prediction of material properties under HDC hybrid excitations, to test electromagnetic analysis methods and finite element (FE) computation models and investigate the electromagnetic behavior of typical magnetic and electromagnetic shields in electrical equipment.

Findings

The updated Problem 21 Family (V.2021) can now be used to investigate and validate the total power loss and the different shielding performance of magnetic and electromagnetic shields under various HDC hybrid excitations, including the different spatial distributions of the same excitation parameters. The new member-set (P21^e) with magnetic flux compensation can experimentally determine the total power loss inside the load-component, which helps to validate the numerical modeling and simulation with confidence. The additional iron loss inside the laminated sheets caused by the magnetic flux normal to the laminations must be correctly modeled and predicted during the design and analysis. It is also observed that the magnetic properties (B27R090) measured in the rolling and transverse directions with different direct current (DC) biasing magnetic field are quite different from each other.

Research limitations/implications

The future benchmarking target is to study the effects of stronger HDC hybrid excitations on the internal loss behavior and the microstructure of magnetic load components.

Originality/value

This paper proposes a new extension of Problem 21 Family (1993–2021) with the upgraded excitation, involving multi-harmonics and DC bias. The alternating current (AC) and DC excitation can be applied at the two sides of the model’s load-component to avoid the adverse impact on the AC and DC power supply and investigate the effect of different AC and DC hybrid patterns on the total loss inside the load-component. The overall effectiveness of numerical modeling and simulation is highlighted and achieved via combining the efficient electromagnetic analysis methods and solvers, the reliable material property modeling and prediction under complex excitations and the precise FE computation model using partition processing. The outcome of this project will be beneficial to large-scale and high-performance numerical modeling.

中文翻译：

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基于更新的 TEAM 问题 21，谐波-直流混合激励下磁性和非磁性元件内部杂散场损耗的建模和验证

目的

本文旨在提出并建立一套新的基准模型，以研究并自信地验证谐波-直流 (HDC) 混合激励下磁性和非磁性组件内部总杂散场损耗的建模和预测。作为新成员集（P21 ^Ë的测试电磁分析方法问题21族），重点是有效的分析方法和在复杂激励准确材料属性建模。

设计/方法/方法

这种基于P21 ^e的基准测试涵盖了具有磁通量补偿的新基准模型的设计、具有 HDC 混合激励的新基准测量系统的建立、测试程序的制定（例如定义的案例 I-V）以及测量和预测 HDC 混合激励下的材料特性，测试电磁分析方法和有限元 (FE) 计算模型，并研究电气设备中典型磁性和电磁屏蔽的电磁行为。

发现

更新后的问题 21 系列 (V.2021) 现在可用于研究和验证在各种 HDC 混合激励下磁屏蔽和电磁屏蔽的总功率损耗和不同屏蔽性能，包括相同激励参数的不同空间分布。新成员集 (P21 ^e) 磁通补偿可以通过实验确定负载组件内部的总功率损耗，这有助于自信地验证数值建模和仿真。在设计和分析过程中，必须正确建模和预测由垂直于叠片的磁通量引起的叠片内部的额外铁损。还观察到，在具有不同直流（DC）偏置磁场的滚动和横向方向上测量的磁特性（B27R090）彼此有很大差异。

研究限制/影响

未来的基准目标是研究更强的 HDC 混合激励对磁负载组件的内部损耗行为和微观结构的影响。

原创性/价值

本文提出了问题 21 系列（1993-2021）的新扩展，其中包含升级的激励，涉及多谐波和直流偏置。可以在模型负载分量的两侧施加交流（AC）和直流激励，以避免对交直流电源产生不利影响，并研究不同交直流混合模式对内部总损耗的影响载荷分量。通过结合高效的电磁分析方法和求解器、复杂激励下可靠的材料特性建模和预测以及使用分区处理的精确有限元计算模型，突出并实现了数值建模和仿真的整体有效性。该项目的成果将有利于大规模、高性能的数值建模。