Compressive stress effects on magnetic properties of uncoated grain oriented electrical steel

Modeling the Effect of Compressive Stress on Hysteresis Loop of Grain-Oriented Electrical Steel

“…Figure 13 shows typically measured hysteresis loops at B m = 1.5 T. For the compressed sample, a characteristic distortion of loop shape in the low field (Rayleigh) region is observed. It is similar to the shape of hysteresis loops for two-phase materials [49,50] or those measured in the transverse direction for highly anisotropic steels [2,3,[51][52][53][54][55]. Briefly speaking, this effect may be explained by the interchange of the roles of 180 • (Bloch) and 90 • (Néel) domain walls upon a specific threshold field.…”

“…This simulation discloses that it is straightforward to model the loss asymmetry of compression-tension characteristics [63][64][65] (in the first approximation, power losses are proportional to H C ). It should be recalled that the aforementioned asymmetry holds not only for power losses but also for magnetostriction [3]; this effect has been addressed in some other stress-dependent hysteresis models [6][7][8]38].…”

“…The researchers examined in detail the beneficial effect of forsterite coating usually applied to the steel surface on the outcome properties of GOES. On the other hand, the recent paper by Dias and Landgraf [3] focused on the experimental examination of the effect of compressive stress on hysteresis loops, power loss and peak-to-peak magnetostriction in uncoated GOES. The observed trends were explained using an analysis of predicted domain structure in the material.…”

“…for conditions when buckling may already occur. Usually for a typical 0.27 mm thick grain-oriented steel, buckling may occur easily; consequently, several articles analyzed the hysteresis loops below 70 MPa [2][3][4][5].…”

Produção de chapas de ligas de Fe-Ti e aperfeiçoamento de suas propriedades magnéticas e microestruturais para utilização em máquinas elétricas e transformadores de baixo ruído

“…Desta forma, os domínios magnéticos perpendiculares à tensão aplicada são favorecidos em detrimento dos domínios alinhados paralelamente. Com o aumento da quantidade de paredes de domínio de 90°, o processo de magnetização é dificultado uma vez que paredes de domínio com 180° possuem mobilidade maior que as de 90°, resultando em um aumento da área da histerese (49,50). Portanto, um material com magnetostricção negativa, λ < 0, como as ligas de Fe-Ti, a com 4%Ti, permitiria um comportamento oposto em relação à mudança na estrutura de domínio, resultando numa diminuição da energia magnetoelástica, facilitando o processo de magnetização, melhorando assim o rendimento do motor.…”