Experimental calibration in thermal analysis of PM electrical machines

Sabrina Ayat, Rafal Wrobel, James Goss, David Drury

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

17 Citations (Scopus)
342 Downloads (Pure)


Thermal design of electric machines frequently involves tests on a fully constructed prototype to calibrate various build factors associated with the manufacture, assembly and materials used in the hardware construction. The prototype machine is usually instrumented with multiple temperature sensors providing a detailed insight into the temperature distribution. The resolution of the experimentally gathered data is usually limited by the number of temperature sensors, and therefore the quality of model calibration is highly affected by the input data. This paper investigates the issue of thermal model calibration in the context of available machine hardware and measured data resolution. Also, the research evaluates the most suitable thermocouple location with reference to the model complexity, from reduced-order lumped-parameters circuit to high-fidelity finite element method (FEM). The investigation is focused on the stator-winding assembly, which is frequently associated with the main source of power loss within a PM machine body. A prototype of a PM generator has been selected to illustrate the effects associated with the model calibration. Tests on a representative stator-winding sub-assembly (motorette) have been used in the analysis. The results suggest that the measured data from alternative sensor locations for a given machine region has a significant impact on the quality of the model calibration and consequently temperature predictions.

Original languageEnglish
Title of host publicationECCE 2016 - IEEE Energy Conversion Congress and Exposition, Proceedings
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages8
ISBN (Electronic)9781509007370
ISBN (Print)9781509007387
Publication statusPublished - 16 Feb 2017
Event2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016 - Milwaukee, United States
Duration: 18 Sep 201622 Sep 2016


Conference2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016
Country/TerritoryUnited States


  • Model calibration
  • reduced-order machine sub-assembly
  • thermal analysis
  • PM electrical machine
  • hardware testing
  • Windings
  • Stator cores
  • Stator windings
  • Temperature measurement
  • Integrated circuit modeling


Dive into the research topics of 'Experimental calibration in thermal analysis of PM electrical machines'. Together they form a unique fingerprint.

Cite this