Magnetic domain refinement of silicon-steel laminations by laser scribing

摘要: Laser scribing of 3% silicon steel laminations was carried out using three different lasers: a KrF excimer laser, pulsed Nd:YAG laser and continuous wave CO2 laser. The processing parameters included the energy fluence at surface workpiece, pulse repetition rate separation distance (for lasers), scan direction. samples were tested for hysteresis loss, permeability, coercivity, remanence saturation induction before after treatment. An overall improvement in core loss observed laser-scribed samples. best obtained on rolling direction transverse Three mechanisms proposed to explain efficiency characteristics silicon-steel samples: magnetic domain refinement, stress relaxation inhibition domain-wall movement. Domain namely formation subdomains, results from shocks induced by beam. also relieves stresses that are material during manufacture. scribe lines increase resistivity material, resulting reduced eddy current loss. Tensile created between elongate domains serve refine spacing thus inhibiting wall movement reducing losses.