High-Performance Vernier Machines with Halbach Array Permanent Magnets for Direct Drive Applications

This paper investigates the performance enhancements of permanent magnet Vernier machines (PMVMs) that can be achieved using a new structure Halbach array magnets (HAPMs) for direct-drive motorcycle application. To start with, size and design specifications electric machine are determined based on assumed acceleration drive cycle motorcycle. Then, five-segment (HAPMVMs) with two different slot/pole combinations (24 s/44 p 12 s/20 p) suggested optimized to achieve high torque density an acceptable power factor while maintaining low ripple. Two selected designs from optimizations investigated in full speed range considering efficiency maps. Consequently, order demonstrate effectiveness proposed five-HAPM structure, same optimization methods repeated three-segment HAPMs as well single-piece PMs. The comparisons show great enhancement use five HAPMs. For instance, 22 topology, generated doubles PMs compared single-segment Finally, harmonics magnetic flux airgap PMVMs HAPMVMs reveal reasons behind superiority VMs