Laser energetic parameters

The following work has been presented at the Materials Conference held in September 4-7, 2019, in Poznań, Poland.

Correlation between laser energetic parameters with long or short pulsed lasers and magnetic properties of grain-oriented silicon iron sheets submitted to surface treatment

M. Nesser1 ,O. Maloberti2,1 , E. Salloum1 , J. Dupuy3 , J. Fortin1 , S. Panier1 , P. Dassonvalle2,4 1 LTI Laboratory, Avenue des Facultés - Le Bailly, Amiens, FR 80025 2ESIEE-Amiens, 4 quai de la Somme, Amiens, FR 80082 3Multitel a.s.b.l, Parc Initialis, Mons, BE 7000 4MIS Laboratory, UPJV, 14 quai de la Somme, Amiens, FR 80082

Electrical machines mostly incorporate soft magnetic materials used as flux multipliers. Hence, any reduction in iron losses of the machine‘s core yields in saving energy. Among the techniques, 180° domain refinement by local laser treatment is a non-contact method that shows good results [1]. The present study reassessed the impact of laser treatment on the magnetic properties of grain oriented SiFe sheets by categorizing each treatment according to its effect on the sheet surface into three types: irradiation, scribing and surface ablation. The results show a reduction in total power loss up to 56% for specified induction levels and frequencies. This reduction is accompanied by a significant improvement in the apparent magnetic permeability especially for surface ablation. Different laser’s pulse widths in the infrared zone are used: a femtosecond laser mainly adapted to the surface ablation process and a nanosecond laser used for the irradiation and scribing process [2] [3]. In this paper, different laser energetic parameters, such as the peak power density, the energy density and the cumulative energy density, are investigated while the considered laser pattern remains the same for all the configurations tested. The aim of this work is to present the relationship between laser parameters and their effects on the material surface and the bulk, by according it to surface topography (groove‘s depth, affected zone), induced thermal stress, and magnetic properties of the sheet, including the iron losses, the apparent permeability and the dynamic magnetization property [4] .

References:

[1] S. Patri et al., 0022-2461, 1693-1702 (1996)

[2] P. Beckley and D. Snell, 1059-9495, 209-213 (1994).

[3] I. Petryshynets et al., 2158-3226, 047604 (2018).

[4] O. Maloberti et al., 0304-8853, e507-e509 (2006). 

This study was carried out within the frame of the project ESSIAL, funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 766437.