Advanced High Torque Density PM Vernier Machine With Multiple Working Harmonics

Zou, Tianjie; Li, Dawei; Qu, Ronghai; Jiang, Dong; Li, Jian

Abstract

In recent years, permanent magnet (PM) vernier machines have gained more and more attention due to their high torque density and simple mechanical structure. However, PM vernier (PMV) machines with lap windings always suffer from long end winding length, and regular nonoverlapping winding may result in torque reduction for PMV machines. In this paper, an advanced PMV machine topology with multiple working harmonics is proposed. With specially designed stator auxiliary teeth, this topology could achieve ∼20% higher torque density than that of a regular nonoverlapping winding PMV machine, with the same magnet usage. Through finite element algorithm and theoretical analysis, the production of additional flux density harmonics and their contributions to back-electromotive force (EMF) are verified. Moreover, the electromagnetic performances of this novel machine topology, such as back-EMF and output torque, are quantitatively investigated with the geometric parameters' effect considered. Finally, analysis results are verified by experimental test on a 21 Nm prototype, which is designed to have similar volume and weight with a 14 Nm regular commercial PM machine.

Citation

Zou, T., Li, D., Qu, R., Jiang, D., & Li, J. (2017). Advanced High Torque Density PM Vernier Machine With Multiple Working Harmonics. IEEE Transactions on Industry Applications, 53(6), 5295-5304. https://doi.org/10.1109/tia.2017.2724505

• Journal Article Type: Article
• Acceptance Date: Jun 27, 2017
• Online Publication Date: Jul 7, 2017
• Publication Date: 2017-11
• Deposit Date: Aug 24, 2020
• Journal: IEEE Transactions on Industry Applications
• Print ISSN: 0093-9994
• Electronic ISSN: 1939-9367
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 53
• Issue: 6
• Pages: 5295-5304
• DOI: https://doi.org/10.1109/tia.2017.2724505
• Public URL: https://nottingham-repository.worktribe.com/output/4849448
• Publisher URL: https://ieeexplore.ieee.org/document/7971966