Fault-Tolerant Performance in Multi-Unit PMSMs Through Slot Geometry and Magnetic Decoupling

作者：Yingnan Wang, Chengming Zhang, Yingzhen Liu, David Gerada, Fengyu Zhang, Zeyuan Xu · 年份：2025 · DOI：10.1109/iecon58223.2025.11221744 · 被引用次数：1 · 研究领域：Electric Motor Design and Analysis、Multilevel Inverters and Converters、HVDC Systems and Fault Protection

To enhance the fault tolerance of modular multi-unit three-phase PMSMs, this paper investigates the influence of pole-slot combinations and stator slot geometries on inter-phase magnetic coupling. A novel open-slot structure with fault-tolerant teeth (FTT) is proposed to improve magnetic decoupling and unit-level independence.Two configurations— 40p48s and 40p36s—combined with three slot types are analyzed via finite element simulation. Flux distribution and inductance matrices are obtained to quantify magnetic coupling, and a coupling coefficient is defined for comparison.To evaluate short-circuit performance, turn-to-turn faults of varying severity are introduced via an external circuit model. Results show that the 40p36s structure with FTT provides superior decoupling and fault containment, enabling continued operation of healthy units without control intervention.