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Performance Estimation of a Traction Machine with Direct Cooled Hairpin Winding

Reinap, Avo LU ; Andersson, Mats LU ; Márquez-Fernández, Francisco J. LU orcid ; Abrahamsson, Philip LU and Alaküla, Mats LU orcid (2019) 2019 IEEE Transportation Electrification Conference and Expo
Abstract

Hollow and profiled conductors, which can be categorized as direct cooled conductors, are selected to develop a design proposal of an electrical machine with direct cooled hairpin type of winding. The objectives of this work are 1) investigating the benefits of direct heat removal when using hollow and profiled conductors, and 2) analyzing high frequency capability of these types of windings. Firstly, the winding layouts for a discontinuous hair-pin and a continuous wave winding are drawn in order to visualize the formation of end-turn region and the access points for the coolant. Secondly, the cooling characterization is carried out on basis of a test cell and corresponding 3D FE conjugate heat transfer model. Thirdly, power loss... (More)

Hollow and profiled conductors, which can be categorized as direct cooled conductors, are selected to develop a design proposal of an electrical machine with direct cooled hairpin type of winding. The objectives of this work are 1) investigating the benefits of direct heat removal when using hollow and profiled conductors, and 2) analyzing high frequency capability of these types of windings. Firstly, the winding layouts for a discontinuous hair-pin and a continuous wave winding are drawn in order to visualize the formation of end-turn region and the access points for the coolant. Secondly, the cooling characterization is carried out on basis of a test cell and corresponding 3D FE conjugate heat transfer model. Thirdly, power loss characterization is carried out with focus on AC losses in the winding over the operation range of interest. And finally, a conventional machine where the winding is made a solid rectangular conductor is compared to direct cooled conductors. The exploitation of direct cooled conductors causes higher power losses for the same current as the conductor material is removed for the cooling and thereby improving the thermal management as the coolant removes directly the heat. Consequently, the intermittent torque density, also power capability is increased but that at the cost of a higher tension in the construction materials, specifically in the insulation system, when intensive parallel cooling is applied across the machine winding involving overhangs and the conductors in the slot.

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Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
ITEC 2019 - 2019 IEEE Transportation Electrification Conference and Expo
article number
8790545
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
2019 IEEE Transportation Electrification Conference and Expo
conference location
Detroit, United States
conference dates
2019-06-19 - 2019-06-21
external identifiers
  • scopus:85071312771
ISBN
9781538693100
DOI
10.1109/ITEC.2019.8790545
language
English
LU publication?
yes
id
44c15785-25b1-4aa5-8fc0-d53b45d92bb8
date added to LUP
2019-09-05 14:38:06
date last changed
2022-11-23 00:36:21
@inproceedings{44c15785-25b1-4aa5-8fc0-d53b45d92bb8,
  abstract     = {{<p>Hollow and profiled conductors, which can be categorized as direct cooled conductors, are selected to develop a design proposal of an electrical machine with direct cooled hairpin type of winding. The objectives of this work are 1) investigating the benefits of direct heat removal when using hollow and profiled conductors, and 2) analyzing high frequency capability of these types of windings. Firstly, the winding layouts for a discontinuous hair-pin and a continuous wave winding are drawn in order to visualize the formation of end-turn region and the access points for the coolant. Secondly, the cooling characterization is carried out on basis of a test cell and corresponding 3D FE conjugate heat transfer model. Thirdly, power loss characterization is carried out with focus on AC losses in the winding over the operation range of interest. And finally, a conventional machine where the winding is made a solid rectangular conductor is compared to direct cooled conductors. The exploitation of direct cooled conductors causes higher power losses for the same current as the conductor material is removed for the cooling and thereby improving the thermal management as the coolant removes directly the heat. Consequently, the intermittent torque density, also power capability is increased but that at the cost of a higher tension in the construction materials, specifically in the insulation system, when intensive parallel cooling is applied across the machine winding involving overhangs and the conductors in the slot.</p>}},
  author       = {{Reinap, Avo and Andersson, Mats and Márquez-Fernández, Francisco J. and Abrahamsson, Philip and Alaküla, Mats}},
  booktitle    = {{ITEC 2019 - 2019 IEEE Transportation Electrification Conference and Expo}},
  isbn         = {{9781538693100}},
  language     = {{eng}},
  month        = {{06}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  title        = {{Performance Estimation of a Traction Machine with Direct Cooled Hairpin Winding}},
  url          = {{http://dx.doi.org/10.1109/ITEC.2019.8790545}},
  doi          = {{10.1109/ITEC.2019.8790545}},
  year         = {{2019}},
}