Low-Cost High-Torque-Density Dual-Stator Consequent-Pole Permanent Magnet Vernier Machine

This paper proposes a dual-stator consequent-pole permanent magnet vernier machine comprised of two stators and a sandwiched rotor. The proposed topology has high torque density owing to its special working principle and low cost due to the consequent-pole structure. To verify the superiority of the proposed machine, it is compared with an existing dual-stator vernier machine in terms of important electromagnetic characteristics. The finite-element analysis comparison of the two machines shows that the proposed machine achieves a higher average torque and a higher torque-per-magnet volume in comparison with the existing machine. Moreover, the proposed machine uses less magnet volume; therefore, the cost of the machine is significantly reduced. Furthermore, the proposed machine is more efficient compared with the existing machine.This work was supported in part by the BK21PLUS Program through the National Research Foundation of Korea within the Ministry of Education and in part by the National Research Foundation of Korea (NRF) through the Korea Government (Ministry of Science) under Grant NRF-2017R1A2B4007697