Air inlet/outlet arrangement for rotor cooling application of axial flux PM machines

Ahmad Syahid Fawzal; Remus Cirstea; Tim Woolmer; Mike Dickison; Mike Blundell; Konstantinos N. Gyftakis

doi:10.1016/j.applthermaleng.2017.11.121

Air inlet/outlet arrangement for rotor cooling application of axial flux PM machines

Ahmad Syahid Fawzal, Remus Cirstea, Tim Woolmer, Mike Dickison, Mike Blundell, Konstantinos N. Gyftakis

College of Engineering, Environment & Science

YASA Motors Ltd

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

47 Citations (Scopus)

387 Downloads (Pure)

Abstract

The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ temperature. An operational temperature above the magnets’ threshold may cause demagnetization, particularly under abnormal conditions. For Axial Flux Permanent Magnet (AFPM) machines, the PMs are mounted on its rotor, therefore, one way to regulate the PM temperature is via an appropriate rotor cooling method. Selective designs of air inlet and outlet arrangement have been studied by the Computational Fluid Dynamics (CFD) analysis to assess and compare their flow and cooling capabilities. The new cooling designs were then implemented on a Yokeless and Segmented Armature (YASA) machine for flow experimental validation. Additionally, the cooling performance after the design implementation is analysed via CFD. This paper’s proposed cooling method is expected to lead to lower magnet temperatures, thus increased reliability, output power and efficiency.

Original language	English
Pages (from-to)	1520-1529
Number of pages	10
Journal	Applied Thermal Engineering
Volume	130
Early online date	24 Nov 2017
DOIs	https://doi.org/10.1016/j.applthermaleng.2017.11.121
Publication status	Published - 5 Feb 2018

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Applied Thermal Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering, [130, (2017)] DOI: 10.1016/j.applthermaleng.2017.11.121

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

CFD
Axial flux machine
Rotor cooling
Permanent magnet machines
Heat transfer

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10.1016/j.applthermaleng.2017.11.121

Post-PrintAccepted author manuscript, 1.67 MBLicence: CC BY-NC-ND

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title = "Air inlet/outlet arrangement for rotor cooling application of axial flux PM machines",

abstract = "The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets{\textquoteright} temperature. An operational temperature above the magnets{\textquoteright} threshold may cause demagnetization, particularly under abnormal conditions. For Axial Flux Permanent Magnet (AFPM) machines, the PMs are mounted on its rotor, therefore, one way to regulate the PM temperature is via an appropriate rotor cooling method. Selective designs of air inlet and outlet arrangement have been studied by the Computational Fluid Dynamics (CFD) analysis to assess and compare their flow and cooling capabilities. The new cooling designs were then implemented on a Yokeless and Segmented Armature (YASA) machine for flow experimental validation. Additionally, the cooling performance after the design implementation is analysed via CFD. This paper{\textquoteright}s proposed cooling method is expected to lead to lower magnet temperatures, thus increased reliability, output power and efficiency.",

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author = "Fawzal, \{Ahmad Syahid\} and Remus Cirstea and Tim Woolmer and Mike Dickison and Mike Blundell and Gyftakis, \{Konstantinos N.\}",

note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Applied Thermal Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering, [130, (2017)] DOI: 10.1016/j.applthermaleng.2017.11.121 {\textcopyright} 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/",

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AU - Woolmer, Tim

AU - Dickison, Mike

AU - Blundell, Mike

AU - Gyftakis, Konstantinos N.

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Applied Thermal Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering, [130, (2017)] DOI: 10.1016/j.applthermaleng.2017.11.121 © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2018/2/5

Y1 - 2018/2/5

N2 - The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ temperature. An operational temperature above the magnets’ threshold may cause demagnetization, particularly under abnormal conditions. For Axial Flux Permanent Magnet (AFPM) machines, the PMs are mounted on its rotor, therefore, one way to regulate the PM temperature is via an appropriate rotor cooling method. Selective designs of air inlet and outlet arrangement have been studied by the Computational Fluid Dynamics (CFD) analysis to assess and compare their flow and cooling capabilities. The new cooling designs were then implemented on a Yokeless and Segmented Armature (YASA) machine for flow experimental validation. Additionally, the cooling performance after the design implementation is analysed via CFD. This paper’s proposed cooling method is expected to lead to lower magnet temperatures, thus increased reliability, output power and efficiency.

AB - The maximum power and torque of a Permanent Magnet (PM) machine may be limited by its magnets’ temperature. An operational temperature above the magnets’ threshold may cause demagnetization, particularly under abnormal conditions. For Axial Flux Permanent Magnet (AFPM) machines, the PMs are mounted on its rotor, therefore, one way to regulate the PM temperature is via an appropriate rotor cooling method. Selective designs of air inlet and outlet arrangement have been studied by the Computational Fluid Dynamics (CFD) analysis to assess and compare their flow and cooling capabilities. The new cooling designs were then implemented on a Yokeless and Segmented Armature (YASA) machine for flow experimental validation. Additionally, the cooling performance after the design implementation is analysed via CFD. This paper’s proposed cooling method is expected to lead to lower magnet temperatures, thus increased reliability, output power and efficiency.

KW - CFD

KW - Axial flux machine

KW - Rotor cooling

KW - Permanent magnet machines

KW - Heat transfer

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DO - 10.1016/j.applthermaleng.2017.11.121

M3 - Article

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VL - 130

SP - 1520

EP - 1529

JO - Applied Thermal Engineering

JF - Applied Thermal Engineering

ER -

Air inlet/outlet arrangement for rotor cooling application of axial flux PM machines

Abstract

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