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Principle of torque-axis alignment in new asymmetric PM synchronous reluctance machines : towards less-rare-earth PM machines

Akbar Mohammadi Ajamloo (UGent) , Aghil Ghaheri, Mohamed Ibrahim (UGent) and Peter Sergeant (UGent)
(2024) IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION.
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Abstract
This paper reveals the principle of a new torque-axis alignment technique as the basis for a new class of asymmetric permanent magnet synchronous reluctance machines (PMSynRMs). These machines are characterized by having distinct PM and SynRM poles. The objective is to precisely align peak torque from each pole type by adjusting the relative shift angle, minimizing the rare-earth PM usage. A new analytical model is proposed, segregating torque generated by each pole type in a rotating d-q reference frame. The impact of PM pole configuration − surface PM (SPM) and interior PM (IPM) − is examined, and the effects of cross coupling and saturation are investigated. Two different torque separation models are used to describe key torque characteristics of the machines. The analysis indicates that the asymmetric IPMSynRM and SPMSynRM offer the same torque rating at a significantly lower PM volume usage compared to the conventional PM-assisted SynRM. Additionally, it is observed that asymmetric IPMSynRM exhibits superior torque performance compared to asymmetric SPMSynRM, attributed to additional reluctance torque generated by IPM poles. Finally, a prototype is manufactured and tested to evaluate the presented principle in the asymmetric topologies.

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MLA
Mohammadi Ajamloo, Akbar, et al. “Principle of Torque-Axis Alignment in New Asymmetric PM Synchronous Reluctance Machines : Towards Less-Rare-Earth PM Machines.” IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION, 2024, doi:10.1109/tte.2024.3509499.
APA
Mohammadi Ajamloo, A., Ghaheri, A., Ibrahim, M., & Sergeant, P. (2024). Principle of torque-axis alignment in new asymmetric PM synchronous reluctance machines : towards less-rare-earth PM machines. IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION. https://doi.org/10.1109/tte.2024.3509499
Chicago author-date
Mohammadi Ajamloo, Akbar, Aghil Ghaheri, Mohamed Ibrahim, and Peter Sergeant. 2024. “Principle of Torque-Axis Alignment in New Asymmetric PM Synchronous Reluctance Machines : Towards Less-Rare-Earth PM Machines.” IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION. https://doi.org/10.1109/tte.2024.3509499.
Chicago author-date (all authors)
Mohammadi Ajamloo, Akbar, Aghil Ghaheri, Mohamed Ibrahim, and Peter Sergeant. 2024. “Principle of Torque-Axis Alignment in New Asymmetric PM Synchronous Reluctance Machines : Towards Less-Rare-Earth PM Machines.” IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION. doi:10.1109/tte.2024.3509499.
Vancouver
1.
Mohammadi Ajamloo A, Ghaheri A, Ibrahim M, Sergeant P. Principle of torque-axis alignment in new asymmetric PM synchronous reluctance machines : towards less-rare-earth PM machines. IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION. 2024;
IEEE
[1]
A. Mohammadi Ajamloo, A. Ghaheri, M. Ibrahim, and P. Sergeant, “Principle of torque-axis alignment in new asymmetric PM synchronous reluctance machines : towards less-rare-earth PM machines,” IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION, 2024.
@article{01JEDD6XHZ17RVNR5BGJT78VVA,
  abstract     = {{This paper reveals the principle of a new torque-axis alignment technique as the basis for a new class of asymmetric permanent magnet synchronous reluctance machines (PMSynRMs). These machines are characterized by having distinct PM and SynRM poles. The objective is to precisely align peak torque from each pole type by adjusting the relative shift angle, minimizing the rare-earth PM usage. A new analytical model is proposed, segregating torque generated by each pole type in a rotating d-q reference frame. The impact of PM pole configuration − surface PM (SPM) and interior PM (IPM) − is examined, and the effects of cross coupling and saturation are investigated. Two different torque separation models are used to describe key torque characteristics of the machines. The analysis indicates that the asymmetric IPMSynRM and SPMSynRM offer the same torque rating at a significantly lower PM volume usage compared to the conventional PM-assisted SynRM. Additionally, it is observed that asymmetric IPMSynRM exhibits superior torque performance compared to asymmetric SPMSynRM, attributed to additional reluctance torque generated by IPM poles. Finally, a prototype is manufactured and tested to evaluate the presented principle in the asymmetric topologies.}},
  author       = {{Mohammadi Ajamloo, Akbar and Ghaheri, Aghil and Ibrahim, Mohamed and Sergeant, Peter}},
  issn         = {{2332-7782}},
  journal      = {{IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION}},
  language     = {{eng}},
  pages        = {{14}},
  title        = {{Principle of torque-axis alignment in new asymmetric PM synchronous reluctance machines : towards less-rare-earth PM machines}},
  url          = {{http://doi.org/10.1109/tte.2024.3509499}},
  year         = {{2024}},
}
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