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Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction

Zou, Tianjie; Gerada, David; La Rocca, Salvatore; La Rocca, Antonio; Walker, Adam; Vakil, Gaurang; Arevalo, Saúl López; Xu, Zeyuan; Cui, Mengmeng; Bardalai, Anuvav; Wang, Meiqi; Kumar, R. M. Ram; Marfoli, Alessandro; Paciura, Krzysztof; Barden, Richard; Ernest, Emil; Zhu, Shaohong; Qayyum, Naila; McQueen, Alastair; Zhang, Fengyu; Gerada, Chris

Authors

DAVID GERADA D.Gerada@nottingham.ac.uk
Professor of Electrical Engineering

ANTONINO LA ROCCA ANTONINO.LAROCCA@NOTTINGHAM.AC.UK
Professor of Applied Thermofluids and Propulsion Systems

Adam Walker

Saúl López Arevalo

ZEYUAN XU ZEYUAN.XU@NOTTINGHAM.AC.UK
Principal Research Fellow

Mengmeng Cui

Anuvav Bardalai

Meiqi Wang

R. M. Ram Kumar

Alessandro Marfoli

Krzysztof Paciura

Richard Barden

Emil Ernest

Shaohong Zhu

Naila Qayyum

Alastair McQueen

FENGYU ZHANG FENGYU.ZHANG1@NOTTINGHAM.AC.UK
Anne Mclaren Fellow



Abstract

Synchronous reluctance (Syn-Rel) machines with embedded permanent magnets (PMs) are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). In this paper, the potential of PM-assisted Syn-Rel machine to be next generation heavy duty traction motor solution has been investigated, with special attention put on one key geometric parameter, i.e., airgap length. Careful machine design and optimization has been conducted based on geometric parametrization including airgap length variation, for 15000rpm peak speed and 350kW peak power output. In low speed operations, the influence of airgap length on different torque components has been analyzed in detail based on the frozen permeability method. In field weakening region, the variation trend of several key parameters such as output power, torque ripple, and power losses have been investigated along with airgap length. It is found that with high electric and magnetic loading, reducing the electromagnetic airgap length is not always beneficial. There exists a suitable airgap length value to comprehensively balance torque/power density, cooling capability, efficiency and reliability. Numerical FEA and experimental tests of the prototype are combined to verify the conclusions.

Citation

Zou, T., Gerada, D., La Rocca, S., La Rocca, A., Walker, A., Vakil, G., …Gerada, C. (2023). Airgap Length Analysis of a 350kW PM-Assisted Syn-Rel Machine for Heavy Duty EV Traction. IEEE Transactions on Industry Applications, 59(2), 1557-1570. https://doi.org/10.1109/TIA.2022.3225255

Journal Article Type Article
Acceptance Date Nov 18, 2022
Online Publication Date Nov 28, 2022
Publication Date 2023
Deposit Date Mar 29, 2023
Publicly Available Date Mar 29, 2024
Journal IEEE Transactions on Industry Applications
Print ISSN 0093-9994
Electronic ISSN 1939-9367
Publisher Institute of Electrical and Electronics Engineers (IEEE)
Peer Reviewed Peer Reviewed
Volume 59
Issue 2
Pages 1557-1570
DOI https://doi.org/10.1109/TIA.2022.3225255
Keywords Electrical and Electronic Engineering; Industrial and Manufacturing Engineering; Control and Systems Engineering
Public URL https://nottingham-repository.worktribe.com/output/14322424
Publisher URL https://ieeexplore.ieee.org/document/9964435

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