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Global mock-up; (a) fixed structure of the press; (b) see Fig. 4; (c) movable steel plate; (d) hydraulic jack.
Source publication
The manufacturing processes of electrical machines may lead to significant degradation of the magnetic properties of their magnetic core (stator, rotor) performances and, as a consequence, to a decrease of their energy efficiency. While the effects of some processes (cutting, welding …) are widely discussed in the literature, this is not the case w...
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Citations
... T HE magnetic characteristics of electrical steel as observed in finalized transformers and electrical rotating machines often deviate from those measured in optimized single sheets or predicted through numerical methods. A primary contributing factor to this disparity lies in the assembly process of the core, where deleterious mechanical stresses, both within the plane and perpendicular to the sheet, are induced by factors such as bolt bundles, welding, or clinching [1]. These stresses can significantly amplify magnetic losses, magnetostriction, and subsequent acoustic noise-properties of utmost concern to machine designers. ...
Electrical steel's magnetic properties in industrial applications often differ from theoretical predictions due to assembly-induced mechanical stresses. In this study, we evaluate the impact of compressive stress applied perpendicular to the core on the magnetic behavior of structures crafted with an innovative approach. Utilizing shifted grain-oriented Fe-Si steel rings, the strategy effectively alleviates magnetic losses and mitigates magnetostriction-related vibrations. Insights into complex magnetization processes are revealed through the analysis of first-order reversal curves (FORC), demonstrating stress-induced alterations in hysteresis loops and FORC diagrams. Under the applied stress, an additional magnetization process emerges at low magnetic fields, resulting from domain reorganization and interacting with the effects introduced by shifting the layers within the core.
