Résumé:
The use of rare-earth permanent magnets in electrical machines, particularly in traction applications, raises critical concerns regarding environmental impact and supply chain stability. These issues have intensified the need for alternative motor topologies capable of substituting permanent-magnet synchronous machines while maintaining comparable performance. This study investigates the continuous operating capability of different non-rare-earth machine configurations under identical volume and thermal constraints. Two candidates, an electrically excited synchronous machine (EESM) and a homopolar topology, were designed and analyzed for this purpose. Their electromagnetic performance, losses, and thermal behavior were evaluated to determine their suitability as viable replacements for permanent magnet synchronous motors. The results show that the EESM is primarily limited by thermal constraints, while the homopolar topology is intrinsically limited by its electromagnetic structure.
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