Investigation of a Novel Linear Partitioned Primary Hybrid-excited Consequent-pole Flux-reversal Permanent Magnet Machine

This paper proposes a novel linear partitioned hybrid-excited consequent-pole flux-reversal machine featuring a wide flux adjusting range with less PM consumption. Due to the space confliction between armature and field windings in conventional hybrid-excited machine, the consequent-pole partitioned primary structure is employed to improve the PM utilization ratio and further enhance the flux regulation capability. Firstly, the topology, operation principle and flux regulation mechanism are introduced. Then, using finite element method (FEM), the dimensional parameters of the proposed machine and a conventional machine for comparison are globally optimized for higher thrust force and wider flux adjusting range. The electrical performance of optimized structures including open-circuit airgap flux density, open-circuit phase back-electromotive force (back-EMF), flux-adjusting capability and force characteristics are investigated. Furthermore, demagnetization and normal force are analyzed. Finally, a prototype is manufactured to validate the effectiveness of the proposed topology and analysis. The proposed machine is observed to have better flux regulation capability than conventional machine with improved PM utilization ratio, which means it is suitable for wide speed range system applications.