Thermal Modelling of a Liquid Cooled Traction Machine with 8-layer Hairpin Windings

Antonino La Rocca, Tianjie Zou, Mohsen Moslemin, David Gerada, Chris Gerada, Alasdair Cairns

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

Abstract

This paper describes the conjugate thermal analysis performed on an traction electric motor for electric vehicle (EV). The machine considered adopts hairpin windings and the cooling is achieved by combining an external water jacket and internal oil spray on the end-windings which is delivered by high pressure nozzles. The thermal characterization was performed in two stages; in the first stage the thermal performance of the original design was investigated whilst in the second stage some solutions were proposed to enhance the cooling effectiveness. Due to the heavy computational cost of the analyses, performed by the means of Computational Fluid Dynamics (CFD), fluid flow and conduction heat transfer were investigated separately. The results produced have shown that despite the good overall cooling capabilities of the spray, some issues may arise when the motor operates at low speed-high torque condition as the number pin layers increases. In this scenario droplets might struggle to penetrate through the conductors, leading to localized hotspots. It is also found that minor adjustments of the position of the nozzles may considerably improve the heat transfer rate. The realistic 3D representation of the conductors has allowed to further improve the accuracy of the analyses carried out.

Original languageEnglish
Title of host publicationIECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society
PublisherIEEE Computer Society
ISBN (Electronic)9781665435543
DOIs
Publication statusPublished - 13 Oct 2021
Externally publishedYes
Event47th Annual Conference of the IEEE Industrial Electronics Society, IECON 2021 - Toronto, Canada
Duration: 13 Oct 202116 Oct 2021

Publication series

NameIECON Proceedings (Industrial Electronics Conference)
Volume2021-October

Conference

Conference47th Annual Conference of the IEEE Industrial Electronics Society, IECON 2021
Country/TerritoryCanada
CityToronto
Period13/10/2116/10/21

Keywords

  • CFD
  • Haripin Windings
  • High Power Density
  • Spray Cooling
  • Thermal Management

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Thermal Modelling of a Liquid Cooled Traction Machine with 8-layer Hairpin Windings'. Together they form a unique fingerprint.

Cite this