A Novel Triple-Permanent-Magnet-Excited Vernier Machine with Double-Stator Structure for Low-Speed and High-Torque Applications

Xinbo Liu, Xu Zhong, Yi Du and Xun Chen
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Xinbo Liu: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Xu Zhong: School of Electronics and Information, Jiangsu University of Science and Technology, Zhenjiang 212013, China
Yi Du: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Xun Chen: School of Electronics and Information, Jiangsu University of Science and Technology, Zhenjiang 212013, China

Energies, 2018, vol. 11, issue 7, 1-18

Abstract: In this paper, a novel triple-permanent-magnet-excited vernier (TPMEV) machine with double-stator (DS) is proposed, of which the power density and the torque density are effectively improved to satisfy the operating requirements of low speed and high torque density for direct drive systems. Three sets of permanent magnets (PMs) are placed on the two stators and the rotor, respectively, and the magnetic fields excited by these PMs are modulated to effective magnetic field harmonics with low pole-pair numbers and high speeds based on bi-directional field modulation effect of the non-uniform airgap permeance. Then two sets of armature windings respectively accommodated in two stators are designed according to the effective magnetic field harmonics, thus achieving the coupling between the PM magnetic fields produced by three sets of PMs and armature windings. Firstly, the topology of the TPMEV-DS machine is introduced. Secondly, the airgap flux density of the machine is analyzed based on the equivalent magnetic circuit method, which proves the improvement potentiality of power density and torque density due to the bi-directional field modulation effect. Finally, the performance of the TPMEV-DS machine is calculated and analyzed by the finite element method, verifying the advantages of high power density and high torque density for the direct drive systems.

Keywords: triple-permanent-magnet-excited; bi-directional field modulation effect; equivalent magnetic circuit method; finite element analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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