Impact of slot shape on loss and thermal behaviour of open-slot modular stator windings

Rafal Wrobel, Sam J Williamson, Nick Simpson, Sabrina Ayat, Jason Yon, Phil Mellor

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

17 Citations (Scopus)
626 Downloads (Pure)

Abstract

This paper presents results from an investigation into the optimal design of an open-slot, modular stator winding. The impact of the stator slot shape on the winding temperature rise is explored, taking account the distribution of loss that occurs in the open slot winding, including ac effects, and the heat transfer characteristics from the winding assembly into the stator core pack. The application focus is a single-layer, concentrated wound brushless PM machine, however the work is applicable to other machine formats. Alternative stator lamination profiles are compared; the commonly used parallel sided tooth with a trapezoidal slot, and a parallel sided slot with a trapezoidal tooth. The investigation includes the development of a reduced order thermal model representation of the stator. This model is employed to undertake coupled loss and thermal analyses to provide more accurate comparisons of the designs accounting for ac and temperature effects. The experimental and theoretical findings indicate the parallel sided slot design will result in a 37°C lower winding temperature or an 11% increase in torque at the intended machine operation point.
Original languageEnglish
Title of host publication2015 IEEE Energy Conversion Congress and Exposition (ECCE 2015)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages4433-4440
Number of pages8
ISBN (Electronic)9781467371506
ISBN (Print)9781467371520
DOIs
Publication statusPublished - Jan 2016
Event2015 IEEE Energy Conversion Congress and Exposition - Montreal Convention Center, Montréal , Canada
Duration: 20 Sep 201524 Sep 2015

Publication series

NameProceedings of the IEEE Energy Conversion Congress and Exposition (ECCE)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISSN (Print)4433-4440

Conference

Conference2015 IEEE Energy Conversion Congress and Exposition
CountryCanada
CityMontréal
Period20/09/1524/09/15

Keywords

  • Winding power loss
  • Parallel sided slot design
  • Open-slot modular stator winding
  • Slot shape
  • Thermal analysis

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