Design of an Axial-Field Flux-Modulated Permanent Magnet Machine for Electric Vehicles

This article proposes an axial-field permanent magnet (AFPM) machine topology, in which two stators with splitting teeth and a rotor with N-iron PM arrangement are included. Specifically designed for direct-drive electric vehicle (EV) applications, this machine boasts a compact structure and high torque density. This paper comprehensively outlines the topology and operation principles governing the AFFMPM machine, with a focused exploration of its evolution process from the axial-field magnetic gear. Utilizing the three-dimensional finite element method (3D FEM), the proposed AFPM machine's electromagnetic characteristics are demonstrated. The results reveal a remarkable enhancement compared to the baseline AFPM model, achieving a 108% increase in torque and a 166% improvement in torque/PM volume. The AFPM prototype is constructed and experimented to confirm the analysis.