Non-oriented electrical steel (NOES) is commonly used as a core material in electric machines. These laminations are cut into the desired core shape that modifies the material properties near the cut edge, which consequently changes the magnetic performance of the core lamination. Magnetic property deterioration due to cutting has been reported in the literature but less attention has been given to the microstructural changes due to cutting and its relation to the magnetic properties. The present research focuses on the effects of laser cutting on microstructure and magnetic properties of NOES laminations. A number of lamination steel samples were laser-cut using an identical procedure to that expected on an industrial scale. Property measurements showed that the magnetic permeability of the samples decreased while the core losses increased. The core loss increase was significant, about 22% at 50 Hz and 1.5 T. This was attributed to the change in the micromagnetic characteristics of the sample due to cutting. The change in micromagnetics was investigated using magnetic domain imaging and distorted domain structure was observed near the laser-cut edge. Backscattered electron imaging and nanoindentation measurements were also used for further investigation of micromagnetic properties of the material.

中文翻译：

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激光切割对无取向电工钢叠片组织和磁性能的影响

无取向电工钢 (NOES) 通常用作电机的核心材料。这些叠片被切割成所需的铁芯形状，从而改变切割边缘附近的材料特性，从而改变铁芯叠片的磁性能。文献中已经报道了由于切削导致的磁性能劣化，但很少有人关注切削导致的微观结构变化及其与磁性能的关系。目前的研究重点是激光切割对 NOES 叠片的微观结构和磁性能的影响。许多层压钢样品使用与工业规模预期相同的程序进行激光切割。性能测量表明，样品的磁导率降低，而磁芯损耗增加。磁芯损耗显着增加，在 50 Hz 和 1.5 T 时增加了约 22%。这是由于切割导致样​​品微磁特性发生变化。使用磁畴成像研究了微磁性的变化，并在激光切割边缘附近观察到扭曲的畴结构。背散射电子成像和纳米压痕测量也用于进一步研究材料的微磁特性。