The high quality and the relevance of Alexandre’s thesis contributed to get significant results as a part of INTEGRATION project.
About this thesis
The airplane electrical networks, as well as electrical machine control devices, induce a large increase in iron loss proportion compared to other losses. Yields are diminishing but iron loss prediction is the main issue: electrical machines are oversized for safety, become less efficient and the mass gain is reduced. That is why the understanding of the behavior, or characterization, of magnetic materials used in electrical machines under non-ideal conditions is essential. On the other hand, it is necessary to improve the iron loss models in order to make their prediction efficient and to optimize the electrical machine modeling. The more precise their prediction, the more the factors influencing the losses will be determined. It will then be possible to envisage a more global optimization of the electromechanical chain. This thesis is a first step towards this global integration.
The magnetic material characterization was done under various conditions. First, one-dimensional flux density B have been studied. The influence of their spectrum on iron losses was the major purpose of this characterization: amplitude or frequency influence in the case of sinusoidal fields and then harmonic frequency or harmonic phase influence for more complex spectrum. Iron losses are very sensitive to these parameters.
Then, the proposed loss modelling goes through a reconstruction of the hysteresis cycle. Therefore, it consists in predicting B from the H field. Based on Play model, this scalar quasi-static modelling has shown its accuracy and predictability. However, being scalar and quasi-static prevent the model from any time-dependence. An analytical model of eddy currents and a dynamization proposal has been developed. With an eddy current model, frequency effects would be taken into account and thus would complete the quasi-static model.
- M. Yvan LEFEVRE – Laplace Laboratory – INP Toulouse – PhD Advisor
- M. Jean-François LLIBRE – University of Toulouse Jean Jaurès – Co-Supervisor
- M. Alix BERNOT – IRT Saint Exupère – Co-Supervisor
- Mme. Afef LEBOUC – G2ELac – Grenoble INP – Rapporteur
- M. Daniel MATT – IES – University of Montpellier II – Rapporteur
- M. Nelson SADOWSKI – Federal University of Santa Catarina – Examiner
- M. Laurent ALBERT – IRT Saint Exupéry – Invited
Related Publications & Conference Communications
A. Giraud, A. Bernot, Y. Lefevre, J-F Llibre. : “Measurement of magnetic hysteresis swelling-up with frequency: impact on iron losses in electric machine sheets”. CMSM 2017 (International Workshop of Electronics, Control, Measurement, Signals and their application to Mechatronics), May 2017, Donostia, Spain. 2017 IEEE International Workshop of Electronics, Control, Measurement, Signals and their Application to Mechatronics (ECMSM), pp. 1-6, 2017
A. Bernot, A. Giraud, Y. Lefèvre, J-F. Llibre : “Experimental Study of Iron Losses Generated by a Uniform Rotating Field”. IEEE Transactions on Magnetics, Institute of Electrical and Electronics Engineers, 2017, 53 (11), pp.6300705.