On the effect of material processing: microstructural and magnetic properties of electrical steel sheets

Steentjes, Simon; Franck, David; Hameyer, Kay; Vogt, Simon; Bednarz, Martin; Volk, Wolfram; Dierdorf, Jens; Schnabel, Volker; Mathur, Harshal N.; Korte‐Kerzel, Sandra

doi:10.1109/edpc.2014.6984436

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…Laser cutting causes a more significant deformation of domain patterns (in an area of similar width) than guillotine cutting, and changes are observed up to 800 µm from the edge. Works by Steentjes et al [46] and Schoppa et al [47] analyze the results of macroscopic measurements of material properties. The authors state that spark erosion and water jet cutting are the least invasive cutting technologies, slightly changing the domain structure.…”

Section: Morphology Of Grains and Measurements Of The Macroscopic Pro...mentioning

confidence: 99%

The Influence of Cutting Technology on Magnetic Properties of Non-Oriented Electrical Steel—Review State of the Art

2023

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The global drive to reduce energy consumption poses new challenges for designers of electrical machines. Losses in the core are a significant part of losses, especially for machines operating at an increased rotational speed powered by PWM inverters. One of the important problems when calculating core losses is considering the effect of material degradation due to mechanical or laser cutting. To this aim, this paper analyzes and summarizes the knowledge about the sources of material property deterioration and ways of describing this phenomenon. The cited results of material tests indicate the lack of unequivocal relationships allowing us to estimate the degree of material damage and the resulting deterioration of material properties. The main task of this article is to present the state of knowledge on the possibility of taking into account the impact of cutting the core sheets of electric motors on core losses and their impact on the efficiency of the machine. This is a significant problem due to the need to design and manufacture energy-saving electric motors powered with a voltage of 20 to 350 Hz, whose magnetic cores are made of laminates. However, the performed analysis indicates the most important parameters of the cutting process, affecting the degree of material structure destruction. The method of the solution proposed by the authors for core punching and laser cutting, illustrated with a practical example, is also presented.

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Section: Morphology Of Grains and Measurements Of The Macroscopic Pro...mentioning

confidence: 99%

The Influence of Cutting Technology on Magnetic Properties of Non-Oriented Electrical Steel—Review State of the Art

2023

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“…Hysteresis curves and iron losses were measured under a sinusoidal magnetic flux excitation, a maximum polarization of 1 T and at a rather low excitation frequency of Materials 2021, 14, 7055 5 of 10 50 Hz. This is because the influence of blanking-related losses is particularly pronounced for lower frequencies due to the reduction of eddy currents [20]. The magnetization direction was parallel to the cutting line throughout all measurements.…”

Section: Chemicalelementmentioning

confidence: 99%

Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels

et al. 2021

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Non-oriented electrical steel sheets are applied as a core material in rotors and stators of electric machines in order to guide and magnify their magnetic flux density. Their contouring is often realized in a blanking process step, which results in plastic deformation of the cut edges and thus deteriorates the magnetic properties of the base material. This work evaluates the influence of the material’s grain size on its iron losses after the blanking process. Samples for the single sheet test were blanked at different cutting clearances (15 µm–70 µm) from sheets with identical chemical composition (3.2 wt.% Si) but varying average grain size (28 µm–210 µm) and thickness (0.25 mm and 0.5 mm). Additionally, in situ measurements of blanking force and punch travel were carried out. Results show that blanking-related iron losses either increase for 0.25 mm thick sheets or decrease for 0.5 mm thick sheets with increasing grain size. Although this is partly in contradiction to previous research, it can be explained by the interplay of dislocation annihilation and transgranular fracturing. The paper thus contributes to a deeper understanding of the blanking process of coarse-grained, thin electrical steel sheets.

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“…Mechanical cutting such as blanking or shear-slitting requires precise control of many processing parameters depending on the thickness of the material being shaped. These are most often cutting speed [3], cutting clearance [4], rounding of the edges of cutting tools, rake angle of the knife (guillotining), or vertical clearance (shear-sitting) [5]. If there is no knowledge of how to select these parameters, the products obtained after the process may have numerous defects, such as roll-over and wavy cut edges, burrs, and edge cracks [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Process and Results of High-Pressure Abrasive Water Jet Multilayer Cutting of Electrical Steel

Szada-Borzyszkowska,

Kacalak,

Bohdal

et al. 2023

Materials

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Electrical steels are magnetically soft materials and are widely used in the electrical industry for the construction of power transformer cores, distribution transformers, current transformers, and voltage transformers. An important parameter of electrical components, which determines the efficiency of devices, is energy loss during remagnetization. Energy losses are caused by eddy currents, hysteresis, and magnetic delay associated with the low quality of the cut edge after the cutting of steels, and material deformations and excessive stress concentration in the surrounding cutting zones. Common techniques for cutting electrical materials in industrial lines include mechanical cutting and laser cutting. Work has shown that mechanical cutting of electrical steel single layers results in the occurrence of large deformation zones, and in cutting processes with a high-pressure abrasive water jet (AWJ), significant uplifts of material and burrs at the bottom edges of sheets occur. The problem of increasing the cutting quality was solved through selecting the stream parameters for bundle cutting of electrical steels. It has been shown that in the process of cutting electrical sheet bundles, the height of burrs on the cut surface and the zone of plastic deformation are reduced. The work also presents comparison and analysis of characteristic features of the cut edge of electrical sheets obtained through high-pressure abrasive water jet and mechanical cutting processes. The influence of the type and processing parameters on the characteristic features of the material hysteresis loop was determined.

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On the effect of material processing: microstructural and magnetic properties of electrical steel sheets

Cited by 13 publications

References 12 publications

The Influence of Cutting Technology on Magnetic Properties of Non-Oriented Electrical Steel—Review State of the Art

The Influence of Cutting Technology on Magnetic Properties of Non-Oriented Electrical Steel—Review State of the Art

Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels

Analysis of the Process and Results of High-Pressure Abrasive Water Jet Multilayer Cutting of Electrical Steel

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