Design and Analysis of a Novel Dual-Airgap Dual Permanent Magnet Vernier Machine

A novel dual-airgap permanent magnet Vernier machine (DADPMVM) is proposed and analyzed in this paper. The key of this design is combining the double-concentric-rotor structure, the dual permanent magnet structure along with the Vernier structure to improve the torque density while remaining the motor's volume unchanged. The maximized use of the winding length and the reduction of copper loss are also the main merits of this design. The machine structure and operating principle are discussed, and its transient performance is analyzed by using the finite element method (FEM). Two different configurations of pole pairs and two different structures are designed in the same peripheral dimension configuration and compared with the proposed machine by FEM. The results of the comparison are used to confirm the outstanding performance of the proposed machine. The torque density per machine volume can exceed 100 kNm/ m(3) with the proper cooling method.