Investigation of magnetically isolated multiphase modular permanent-magnet synchronous machinery series for wheel-driving electric vehicles

This paper presents a novel multiphase permanent-magnet (PM) synchronous machinery series adopting two adjacent coils per phase and modular stator. Machine design principles, including modular stator design, segmental interior PM-assisted rotor design, and winding factor improvement, are investigated. Moreover, analytical modeling of winding inductance is developed to provide insights into the magnetic circuit of this type of machine. The proposed machinery series is suitable for wheel-driving electric vehicles attributing to their high magnetic isolation feature, good flux-weakening capability, and feasibility of modular fabrication.