Investigation of local properties of the Fe-Si alloy subjected to mechanical and laser cutting

The effective design of energy-saving electric motors with efficiency class IE4 and higher requires the use of material characteristics that take into account the core shaping process. Therefore, it becomes necessary to use analytical or numerical models that take into account the change of local properties of Fe-Si material. The aim of the work is to indicate a useful analytical model for estimating the local magnetic permeability of the material, as well as to understand the reasons for these changes. For this purpose, low-loss ferromagnetic materials cut with a guillotine and a laser were tested. Rectangular samples, cut at an angle of 0 degrees in relation to the rolling direction, were subjected to macroscopic and microscopic examinations. Finally, the main reasons for changes in material characteristics for both cutting technologies were indicated. Therefore, the proposed model takes into account not only the cutting technology used, but also the current width of the tested strip, for which the material characteristics are to be determined. The parameters of the analytical model are determined on the basis of a limited number of measurements carried out on samples of a simple geometric shape

能效等级为IE4及以上的节能电动机的优化设计，需采用适配铁芯成型工艺的材料特性方案。因此，必须构建可考量铁硅（Fe-Si）材料局部性能变化的解析或数值模型。本研究旨在提出一种可用于估算材料局部磁导率的实用解析模型，并阐明此类性能变化的内在机制。为此，针对经剪切断割与激光切割的低损耗铁磁材料展开测试：制备与轧制方向呈0度夹角的矩形试样，对其开展宏观与微观检测分析，最终明确了两种切割工艺下材料特性发生变化的主要诱因。据此，所提出的解析模型不仅可适配所采用的切割工艺，还可针对待获取材料特性的被测带材的当前宽度进行适配调整。该解析模型的参数，可基于少量针对简单几何形状试样开展的测量结果进行标定。