Analysis and Reduction of Magnet Loss by Deepening Magnets in Interior Permanent-Magnet Machines with a Pole/Slot Ratio of 2/3

Junlong Li; Yongxiang Xu; Jibin Zou; Qian Wang; Weiyan Liang

doi:10.1109/TMAG.2015.2445787

Analysis and Reduction of Magnet Loss by Deepening Magnets in Interior Permanent-Magnet Machines with a Pole/Slot Ratio of 2/3

Junlong Li
, Yongxiang Xu
, Jibin Zou^*
, Qian Wang
, Weiyan Liang

^*Corresponding author for this work

School of Electrical Engineering and Automation

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Interior permanent-magnet (IPM) machines are desirable for electrical vehicles due to high power density and good flux-weakening capability. This paper focuses on the approaches to reduction of magnet eddy-current loss in IPM machines with a pole/slot ratio of 2/3, taking a 16-pole/24-slot machine as an example. By comparing permanent-magnet losses between a surface-mounted magnet machine and an IPM machine, the spatial filter effect on even-order stator magnetomotive force space harmonics is highlighted. Thereafter, the effect of magnet depth on magnet eddy-current loss is investigated. Moreover, the constraints on reduction effect of magnet's depth, such as copper loss and torque ripple, are analyzed. A 16-pole/24-slot IPM machine prototype is manufactured after the tradeoff design. The experimental results validate the effect of magnet depth on reducing magnet losses.

Original language	English
Article number	7124467
Journal	IEEE Transactions on Magnetics
Volume	51
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2015.2445787
State	Published - 1 Nov 2015

Keywords

IPM machines
Tradeoff design
magnet depth
magnet loss reduction

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10.1109/TMAG.2015.2445787

Cite this

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title = "Analysis and Reduction of Magnet Loss by Deepening Magnets in Interior Permanent-Magnet Machines with a Pole/Slot Ratio of 2/3",

abstract = "Interior permanent-magnet (IPM) machines are desirable for electrical vehicles due to high power density and good flux-weakening capability. This paper focuses on the approaches to reduction of magnet eddy-current loss in IPM machines with a pole/slot ratio of 2/3, taking a 16-pole/24-slot machine as an example. By comparing permanent-magnet losses between a surface-mounted magnet machine and an IPM machine, the spatial filter effect on even-order stator magnetomotive force space harmonics is highlighted. Thereafter, the effect of magnet depth on magnet eddy-current loss is investigated. Moreover, the constraints on reduction effect of magnet's depth, such as copper loss and torque ripple, are analyzed. A 16-pole/24-slot IPM machine prototype is manufactured after the tradeoff design. The experimental results validate the effect of magnet depth on reducing magnet losses.",

keywords = "IPM machines, Tradeoff design, magnet depth, magnet loss reduction",

author = "Junlong Li and Yongxiang Xu and Jibin Zou and Qian Wang and Weiyan Liang",

note = "Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",

year = "2015",

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doi = "10.1109/TMAG.2015.2445787",

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AU - Li, Junlong

AU - Xu, Yongxiang

AU - Zou, Jibin

AU - Wang, Qian

AU - Liang, Weiyan

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Interior permanent-magnet (IPM) machines are desirable for electrical vehicles due to high power density and good flux-weakening capability. This paper focuses on the approaches to reduction of magnet eddy-current loss in IPM machines with a pole/slot ratio of 2/3, taking a 16-pole/24-slot machine as an example. By comparing permanent-magnet losses between a surface-mounted magnet machine and an IPM machine, the spatial filter effect on even-order stator magnetomotive force space harmonics is highlighted. Thereafter, the effect of magnet depth on magnet eddy-current loss is investigated. Moreover, the constraints on reduction effect of magnet's depth, such as copper loss and torque ripple, are analyzed. A 16-pole/24-slot IPM machine prototype is manufactured after the tradeoff design. The experimental results validate the effect of magnet depth on reducing magnet losses.

AB - Interior permanent-magnet (IPM) machines are desirable for electrical vehicles due to high power density and good flux-weakening capability. This paper focuses on the approaches to reduction of magnet eddy-current loss in IPM machines with a pole/slot ratio of 2/3, taking a 16-pole/24-slot machine as an example. By comparing permanent-magnet losses between a surface-mounted magnet machine and an IPM machine, the spatial filter effect on even-order stator magnetomotive force space harmonics is highlighted. Thereafter, the effect of magnet depth on magnet eddy-current loss is investigated. Moreover, the constraints on reduction effect of magnet's depth, such as copper loss and torque ripple, are analyzed. A 16-pole/24-slot IPM machine prototype is manufactured after the tradeoff design. The experimental results validate the effect of magnet depth on reducing magnet losses.

KW - IPM machines

KW - Tradeoff design

KW - magnet depth

KW - magnet loss reduction

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DO - 10.1109/TMAG.2015.2445787

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ER -

Analysis and Reduction of Magnet Loss by Deepening Magnets in Interior Permanent-Magnet Machines with a Pole/Slot Ratio of 2/3

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Keywords

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