Consequent-Pole Toroidal-Winding Outer-Rotor Vernier Permanent-Magnet Machines

A novel consequent-pole toroidal-winding outer-rotor (CPTW) Vernier permanent-magnet (VPM) machine is proposed in this paper. Different from a regular VPM machine, the stator and rotor of the proposed machine employ the consequent-pole and toroidal-winding configurations, which can significantly reduce magnet consumption, shorten the end-winding length, and improve the torque density. It is proved by a finite-element algorithm and prototype experiments that this machine can exhibit ~20% higher back electromotive force and electromagnetic torque than that of a regular VPM machine, whereas its magnet consumption is only ~60% of that in a regular VPM machine.