Experimentally calibrated thermal stator modelling of AC machines for short-duty transient operation

Jonathan Godbehere, Rafal Wrobel, David Drury, Phil Mellor

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

7 Citations (Scopus)
318 Downloads (Pure)


This paper presents an approach to the thermal design of an AC machine where the application requires a low-duty transient operation. To provide accurate temperature predictions the design process has been informed with experimental data from tests on a stator-winding sector (motorette). These have been shown to be a time and cost-effective means of calibrating the thermal model of a full machine assembly, prior to manufacture of the final design. Such an approach is usually adopted in design analysis of machines with a concentrated winding topology. Here, the motorette testing has been extended to machines with distributed windings. In the interest of improving heat transfer from the winding body into the machine periphery, several alternative slot liner and impregnating materials have been compared. A total of nine stator section samples have been manufactured and evaluated. The performance trade-offs between the various combinations are discussed in detail alongside their ability to satisfy the design requirements. Based upon these experimental results three stator segment samples have been selected for transient duty analysis. A lumped parameter thermal model has been used and calibrated to match the performance of the experimental samples. This is turn has been used to predict the transient thermal performance of the full machine assembly, for the design
specification. The most promising motorette variant has been selected for machine prototyping.
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 (Electronic)9781509025381
ISBN (Print)9781509025398
Publication statusPublished - Dec 2016
EventXXIIth International Conference on Electrical Machines - SwissTech Convention Center, Lausanne, Switzerland
Duration: 4 Sep 20167 Sep 2016


ConferenceXXIIth International Conference on Electrical Machines
Abbreviated titleICEM'2016


  • AC machines
  • thermal design
  • short-duty transient operation
  • motorette assembly

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