A new permanent-magnet vernier in-wheel motor for electric vehicles

This paper proposes a new permanent-magnet vernier (PMV) in-wheel motor to meet the new demands arising from electric vehicles (EVs). It can offer the advantages of light weight, compact size and low-speed high-torque operation. The key is to newly introduce the flux-modulation poles (FMPs) which can effectively modulate the high-speed rotating field of the armature windings and the low-speed rotating field of the PM outer-rotor. By using the time-stepping finite element method (TS-FEM), the performance of the proposed machine can be accurately analyzed. In addition, a prototype is constructed to experimentally verify the simulation results.