Estimation of Equivalent Thermal Conductivity for Impregnated Electrical Windings Formed from Profiled Rectangular Conductors

Sabrina S Ayat, Rafal Wrobel, James Goss, David Drury

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

14 Citations (Scopus)
699 Downloads (Pure)

Abstract

In order to improve accuracy and reduce model setting-up, and solving time in thermal analysis of electrical machines, transformers and wound passive components, the multi-material winding region is frequently homogenised. The existing winding homogenization techniques are predo-minantly focused on winding constructions with round conductors, where thermal conductivity across conductors is usually assumed to be isotropic. However, for the profiled rectangular conductors that assumption is no longer valid, and anisotropy of the winding equivalent thermal conductivity needs to be considered.
This paper presents analytical methods for deriving equivalent thermal properties of impregnated windings with profiled rectangular conductors. The techniques allow for computationally efficient and accurate derivation of the composite thermal conductivity accounting for the material thermal anisotropy. Efficacy of the methods have been demonstrated on a number of hardware winding samples commonly used in low-voltage applications. The theoretical analysis has been supplemented with experimentally derived data showing close correlation.
Original languageEnglish
Title of host publication8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)
PublisherInstitution of Engineering and Technology (IET)
Number of pages6
ISBN (Print)9781785611889
DOIs
Publication statusPublished - 19 Apr 2016
EventThe 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016) - The Hilton Hotel, Glasgow, Scotland, UK, Glasgow, United Kingdom
Duration: 19 Apr 201621 Apr 2016

Conference

ConferenceThe 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)
CountryUnited Kingdom
CityGlasgow
Period19/04/1621/04/16

Keywords

  • Winding homogenisation techniques
  • equivalent thermal properties
  • thermal analysis
  • electrical machines

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