Defense of two ESSIAL PhDs

Two doctoral students at the UPJV-ESIEE recently defended their thesis on the ESSIAL project: Elias Salloum and Manar Nesser.

Elias Salloum's thesis, presented on 16 December 2020 at ESIEE Amiens, is entitled "Static and dynamic study of magneto-mechanical properties improved by surface laser texturization in electrical steels". It consists in studying the effect of the laser treatment on the magneto-mechanical behavior of electrical steels in order to define the laser configurations that reduce the most the noise and vibration of magnetic origins. The study includes modeling and experimentation analysis that were performed in the Work Package 3 (Physical studies) of ESSIAL and has shown a vibration reduction up to 50%. The work was performed in collaboration with different partners of the project, especially when selecting the optimal laser configurations and performing the treatment, and has contributed in four impacted scientific publications. For the future, Elias will be working on the WP5 (Prototypes), using the identification study performed in WP3, in order to apply the obtained results in electrical machines.

Manar Nesser defended her PhD entitled "Influence of laser treatment with long, short, or ultra-short pulse duration on the magnetic properties and the domain structure of grain-oriented Iron-Silicon steels" on 5 February 2021. This thesis, part of the ESSIAL project, aims to study the impact of ultrashort pulse laser treatment on the magnetic properties of grain-oriented silicon iron electrical steels and to compare this process with the short and long pulse laser. On that account, the impact of each laser is studied using a separated loss model identified by magnetic measurements with an SST "Single Sheet Tester" bench. Optimization of the laser ablation parameters is accomplished ensuring an iron loss reduction at 50 Hz with more than 30% for an induction of 0.5 T, and a percentage of 15% for an induction of above 1.5 T. The ablation process has also shown resistance to a higher temperature than other processes. A correlation between the optical energy parameters, the laser impacts, and the magnetic parameters are presented. Finally, the impact of surface laser treatments on the magnetic domain structure has been analyzed. The results will be used in WP4 (Proof of Concept).

Congratulations to both!