Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines

Tianjie Zou; David Gerada; Adam Walker; Gaurang Vakil; Salvatore La Rocca; Antonino La Rocca; Krzysztof Paciura; Richard Barden; Emil Ernest; Shaohong Zhu; Naila Qayyum; Alastair McQueen; Anuvav Bardalai; R. M. Ram Kumar; Alessandro Marfoli; Chris Gerada

doi:10.1109/ECCE44975.2020.9235712

Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines

Tianjie Zou, David Gerada, Adam Walker, Gaurang Vakil, Salvatore La Rocca, Antonino La Rocca, Krzysztof Paciura, Richard Barden, Emil Ernest, Shaohong Zhu, Naila Qayyum, Alastair McQueen, Anuvav Bardalai, R. M. Ram Kumar, Alessandro Marfoli, Chris Gerada

Nottingham Electrification Centre

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

2 Citations (Scopus)

Abstract

In recent years, synchronous reluctance (Syn-Rel) machines are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). More practically, when kVA limitation is considered, embedded permanent magnets (PMs) have been widely adopted in Syn-Rel rotors to further increase power density as well as power factor. In this paper, the authors have investigated the potential of PM-assisted Syn-Rel machine to be the next generation electrical propulsion motor topology for automotive application, with special attention put on a key geometric parameter, i.e., airgap length. In MTPA region, 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 performance such as peak power, iron loss and torque ripple have been investigated along with airgap length. It is found that with specifically high level of electric and magnetic loading, there exists optimal value of airgap length to achieve high power density based on specific cooling and kVA limitation. Numerical FEA and experimental tests are associated to validate the conclusions.

Original language	English
Title of host publication	ECCE 2020 - IEEE Energy Conversion Congress and Exposition
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1357-1363
Number of pages	7
ISBN (Electronic)	9781728158266
DOIs	https://doi.org/10.1109/ECCE44975.2020.9235712
Publication status	Published - 11 Oct 2020
Event	12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States Duration: 11 Oct 2020 → 15 Oct 2020

Publication series

Name	ECCE 2020 - IEEE Energy Conversion Congress and Exposition

Conference

Conference	12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
Country/Territory	United States
City	Virtual, Detroit
Period	11/10/20 → 15/10/20

Keywords

NdFeB magnets
airgap length
high power density
high speed machine
synchronous reluctance machine

ASJC Scopus subject areas

Electrical and Electronic Engineering
Mechanical Engineering
Control and Optimization
Energy Engineering and Power Technology

Access to Document

10.1109/ECCE44975.2020.9235712

Cite this

Zou, T., Gerada, D., Walker, A., Vakil, G., La Rocca, S., La Rocca, A., Paciura, K., Barden, R., Ernest, E., Zhu, S., Qayyum, N., McQueen, A., Bardalai, A., Ram Kumar, R. M., Marfoli, A., & Gerada, C. (2020). Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines. In ECCE 2020 - IEEE Energy Conversion Congress and Exposition (pp. 1357-1363). Article 9235712 (ECCE 2020 - IEEE Energy Conversion Congress and Exposition). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE44975.2020.9235712

@inproceedings{0864b82b407842c988db8b7842d1cf56,

title = "Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines",

abstract = "In recent years, synchronous reluctance (Syn-Rel) machines are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). More practically, when kVA limitation is considered, embedded permanent magnets (PMs) have been widely adopted in Syn-Rel rotors to further increase power density as well as power factor. In this paper, the authors have investigated the potential of PM-assisted Syn-Rel machine to be the next generation electrical propulsion motor topology for automotive application, with special attention put on a key geometric parameter, i.e., airgap length. In MTPA region, 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 performance such as peak power, iron loss and torque ripple have been investigated along with airgap length. It is found that with specifically high level of electric and magnetic loading, there exists optimal value of airgap length to achieve high power density based on specific cooling and kVA limitation. Numerical FEA and experimental tests are associated to validate the conclusions.",

keywords = "NdFeB magnets, airgap length, high power density, high speed machine, synchronous reluctance machine",

author = "Tianjie Zou and David Gerada and Adam Walker and Gaurang Vakil and {La Rocca}, Salvatore and {La Rocca}, Antonino and Krzysztof Paciura and Richard Barden and Emil Ernest and Shaohong Zhu and Naila Qayyum and Alastair McQueen and Anuvav Bardalai and {Ram Kumar}, {R. M.} and Alessandro Marfoli and Chris Gerada",

note = "Publisher Copyright: {\textcopyright} 2020 IEEE.; 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 ; Conference date: 11-10-2020 Through 15-10-2020",

year = "2020",

month = oct,

day = "11",

doi = "10.1109/ECCE44975.2020.9235712",

language = "English",

series = "ECCE 2020 - IEEE Energy Conversion Congress and Exposition",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

pages = "1357--1363",

booktitle = "ECCE 2020 - IEEE Energy Conversion Congress and Exposition",

address = "United States",

}

Zou, T, Gerada, D, Walker, A, Vakil, G, La Rocca, S, La Rocca, A, Paciura, K, Barden, R, Ernest, E, Zhu, S, Qayyum, N, McQueen, A, Bardalai, A, Ram Kumar, RM, Marfoli, A & Gerada, C 2020, Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines. in ECCE 2020 - IEEE Energy Conversion Congress and Exposition., 9235712, ECCE 2020 - IEEE Energy Conversion Congress and Exposition, Institute of Electrical and Electronics Engineers Inc., pp. 1357-1363, 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020, Virtual, Detroit, United States, 11/10/20. https://doi.org/10.1109/ECCE44975.2020.9235712

Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines. / Zou, Tianjie; Gerada, David; Walker, Adam et al.
ECCE 2020 - IEEE Energy Conversion Congress and Exposition. Institute of Electrical and Electronics Engineers Inc., 2020. p. 1357-1363 9235712 (ECCE 2020 - IEEE Energy Conversion Congress and Exposition).

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines

AU - Zou, Tianjie

AU - Gerada, David

AU - Walker, Adam

AU - Vakil, Gaurang

AU - La Rocca, Salvatore

AU - La Rocca, Antonino

AU - Paciura, Krzysztof

AU - Barden, Richard

AU - Ernest, Emil

AU - Zhu, Shaohong

AU - Qayyum, Naila

AU - McQueen, Alastair

AU - Bardalai, Anuvav

AU - Ram Kumar, R. M.

AU - Marfoli, Alessandro

AU - Gerada, Chris

PY - 2020/10/11

Y1 - 2020/10/11

N2 - In recent years, synchronous reluctance (Syn-Rel) machines are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). More practically, when kVA limitation is considered, embedded permanent magnets (PMs) have been widely adopted in Syn-Rel rotors to further increase power density as well as power factor. In this paper, the authors have investigated the potential of PM-assisted Syn-Rel machine to be the next generation electrical propulsion motor topology for automotive application, with special attention put on a key geometric parameter, i.e., airgap length. In MTPA region, 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 performance such as peak power, iron loss and torque ripple have been investigated along with airgap length. It is found that with specifically high level of electric and magnetic loading, there exists optimal value of airgap length to achieve high power density based on specific cooling and kVA limitation. Numerical FEA and experimental tests are associated to validate the conclusions.

AB - In recent years, synchronous reluctance (Syn-Rel) machines are research hotspots in variable speed motor drives due to their robust rotor structure and wide constant power speed range (CPSR). More practically, when kVA limitation is considered, embedded permanent magnets (PMs) have been widely adopted in Syn-Rel rotors to further increase power density as well as power factor. In this paper, the authors have investigated the potential of PM-assisted Syn-Rel machine to be the next generation electrical propulsion motor topology for automotive application, with special attention put on a key geometric parameter, i.e., airgap length. In MTPA region, 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 performance such as peak power, iron loss and torque ripple have been investigated along with airgap length. It is found that with specifically high level of electric and magnetic loading, there exists optimal value of airgap length to achieve high power density based on specific cooling and kVA limitation. Numerical FEA and experimental tests are associated to validate the conclusions.

KW - NdFeB magnets

KW - airgap length

KW - high power density

KW - high speed machine

KW - synchronous reluctance machine

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U2 - 10.1109/ECCE44975.2020.9235712

DO - 10.1109/ECCE44975.2020.9235712

M3 - Conference contribution

AN - SCOPUS:85097151959

T3 - ECCE 2020 - IEEE Energy Conversion Congress and Exposition

SP - 1357

EP - 1363

BT - ECCE 2020 - IEEE Energy Conversion Congress and Exposition

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

Y2 - 11 October 2020 through 15 October 2020

ER -

Zou T, Gerada D, Walker A, Vakil G, La Rocca S, La Rocca A et al. Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines. In ECCE 2020 - IEEE Energy Conversion Congress and Exposition. Institute of Electrical and Electronics Engineers Inc. 2020. p. 1357-1363. 9235712. (ECCE 2020 - IEEE Energy Conversion Congress and Exposition). doi: 10.1109/ECCE44975.2020.9235712

Influence of Airgap Length on Performance of High Power PM-Assisted Syn-Rel Machines

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Keywords

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