研究目的
To demonstrate the effectiveness of embossed flux barriers in electrical steel laminations by inducing residual stresses that contribute to the guidance of the magnetic flux and cause a negligible mechanical weakening of the sheet.
研究成果
The residual stress introduced by embossing significantly contributes to the guidance of the magnetic flux with negligible mechanical weakening. Neutron grating interferometry and single sheet tests effectively demonstrate the influence of residual stress, with stress-relief annealed samples showing behavior similar to non-embossed samples. The number of embossings linearly affects the deterioration of magnetizability below 1.4 T.
研究不足
The study focuses on non-oriented electrical steel with specific silicon content and thickness. The influence of embossing is analyzed under controlled conditions, which may not fully represent operational environments. The nGI and SST methods provide localized and global insights, respectively, but may not capture all aspects of magnetic property changes.
1：Experimental Design and Method Selection:
The study uses neutron grating interferometry (nGI) for locally resolving the density of magnetic domains and single sheet tests for global mapping of the embossing influence. Finite element analysis (FEA) is employed to derive the residual stress distribution responsible for the measured magnetic behavior.
2：Sample Selection and Data Sources:
Non-oriented electrical steel with a silicon content of 2.4% and a thickness of 0.35 mm is selected. Samples are embossed, with some undergoing stress-relief annealing for comparison.
3：4% and a thickness of 35 mm is selected. Samples are embossed, with some undergoing stress-relief annealing for comparison.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Keyence VK-X100 Series Shape Measurement Laser Microscope for 3D scanning, Schuler stamping press CSP 100 with ServoDirect Technology for embossing, and a double yoke single-sheet-tester (SST) for magnetic measurements.
4：Experimental Procedures and Operational Workflow:
Samples are embossed, scanned, and measured under varying magnetic fields. Stress-relief annealing is performed on some samples for comparison.
5：Data Analysis Methods:
FEA is used to analyze residual stress distribution. nGI and SST data are compared to assess the influence of embossing on magnetic properties.
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