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Identification of synchronous machine magnetization characteristics from calorimetric core-loss and no-load curve measurements

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Article number2001304
JournalIEEE Transactions on Magnetics
Issue number3
Publication statusPublished - 1 Mar 2015
Publication typeA1 Journal article-refereed


The magnetic material characteristics of a wound-field synchronous machine are identified based on global calorimetric core-loss and no-load curve measurements. This is accomplished by solving a coupled experimental-numerical electromagnetic inverse problem, formulated to minimize the difference between a finite-element (FE) simulation-based Kriging surrogate model and the measurement results. The core-loss estimation in the FE model is based on combining a dynamic iron-loss model and a static vector Jiles-Atherton hysteresis model, whose parameters that are obtained by solving the inverse problem. The results show that reasonable hysteresis loops can be produced for a grid-supplied machine, while for an inverter-supplied machine the limitations in the FE and iron-loss models seemingly exaggerate the area of the loop. In addition, the effect of the measurement uncertainty on the inverse problem is quantitatively estimated.


  • Calorimetric loss measurements, electromagnetic inverse problems, iron losses, magnetic hysteresis, synchronous machines