Winding Loss Separation in Thermal Analysis of Electromagnetic Devices

Rafal Wrobel, Nick Simpson

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

8 Citations (Scopus)
512 Downloads (Pure)


This paper investigates various winding loss separation approaches applicable to the thermal analysis of electrical machines, transformers and wound passive components. The accurate temperature prediction and identification of hot-spots within such electromagnetic devices is strongly dependent on the absolute power loss data as well as the loss distribution within the subassemblies or regions of the device. The losses within a device are often defined as the average loss over a particular region, for example, the winding loss, core loss or magnet loss. However, such a loss definition might not yield the required fidelity or resolution, particularly if localised power loss such as ac winding loss is present during device operation. To account for the inhomogeneous winding loss, a more detailed loss separation is required. In this paper, the winding subassembly is subdivided into a number of sub-regions accounting for both the active length and end-winding. Three-dimensional (3D) electromagnetic and thermal analyses are employed to give insight into the effect of the loss definition
on the accuracy and validity of the temperature prediction. A hardware exemplar representative of a single-layer open-slot stator/winding subassembly has been selected for the analysis. The results suggests that detailed loss separation provides improved accuracy of the temperature predictions and hotspots identification when compared with the more common averaged loss definition. The theoretical findings have been validated with experimental data showing close correlation.
Original languageEnglish
Title of host publication2016 XXII International Conference on Electrical Machines (ICEM 2016)
Subtitle of host publicationProceedings of a meeting held 4-7 September 2016, Lausanne, Switzerland
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages7
ISBN (Print)9781509025398
Publication statusPublished - 3 Nov 2016
EventXXIIth International Conference on Electrical Machines - SwissTech Convention Center, Lausanne, Switzerland
Duration: 4 Sept 20167 Sept 2016


ConferenceXXIIth International Conference on Electrical Machines
Abbreviated titleICEM'2016


  • Thermal analysis
  • winding power loss
  • end-winding power loss
  • loss separation
  • electrical machines


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