como; movimento de parede de domínio, nucleação de domínios e aniquilação de domínio.Como as histereses da perda total, histerética e parasita possuem a mesma indução, a histerese da perda anômala pode ser construída. O campo associado à perda anômala foi obtido como resultado da soma entre campo histerético mais parasita menos o campo magnético da perda total. Palavras-chaves:Aço GNO, tamanho de grão, frequência de excitação, perda anômala, histerese da perda anômala. AbstractThis paper discusses about the effect of grain size, excitation frequency and electrical resistivity in magnetic losses, especially the anomalous loss. Also is proposed a method of overlapping hysteresis where the region of occurrence of the anomalous loss during magnetization and demagnetization cycle is disclosed, and thereafter the hysteresis curve of anomalous loss is constructed.For this purpose, three non-oriented steel alloys, with silicon content of 2.05%, 2.45%, 3.3%, were heat treated to increase the grain size by grain growth. Each alloy was treated in the same sequence of temperature in continuous annealing.The grain sizes of the samples were measured by an intercept method.Characterization of magnetic properties was performed using the Epstein frame. The samples, in total 21 sets, were tested under a frequency of 50, 60, 100, 150 and 200 Hz and quasi-static regime (5MHz), both at 1 and 1.5 T. Thus allowing the construction of the hysteresis of quasi-static and total loss. Through the results of the total loss, quasi-static loss and parasite loss, the anomalous loss can be calculated. The results show the behavior of the anomalous loss (Pa) as a function of grain size (ℓ) as and frequency (f) the relationship of . Regarding the behavior of the anomalous loss due to resistivity (ρ), the results are inconclusive. It was found empirically that the optimum grain size is a function of frequency and induction. From a mathematical treatment, the hysteresis of parasite loss plus quasi-static loss was constructed and overlapped to the hysteresis of total loss. The areas between the curves correspond to anomalous loss. It can be seen that anomalous loss occurs in three distinct regions of the hysteresis curve. Such regions may be associated with energy dissipation phenomena, such as: domain wall motion, nucleation and annihilation of domain.Since the hysteresis of total loss, quasi-static loss and parasite loss have the same induction, anomalous hysteresis loss can be constructed. The field associated with anomalous loss was obtained as a result of the sum of quasistatic field plus parasite field minus the magnetic field of the total loss.
Resumo Dois aços de grão não orientado com 2,45 e 3,3 %Si com 7 amostras para cada liga, foram estudados para compreensão do efeito do teor de silício nas perdas histeréticas. As amostras foram recozidas com diferentes temperaturas de recozimento final, resultando em diferentes tamanhos de grão. As perdas histeréticas e B50 foram medidos. Os resultados de B50 mostraram que não houve variação de textura entre as ligas com diferentes %Si. Por fim, os resultados não mostraram variações da energia dissipada pela perda histerética com adição de %Si. Palavras-chave: Aços de grão não orientado; Tamanho de grão; Perdas histeréticas; Teor de silício. EFFECT OF THE SILICON CONTENT IN HYSTERESIS LOSS OF NON-ORIENTED STEELS Abstract Two non-oriented steels with 2.45 and 3.3 %Si with 7 samples for each alloy and same thickness were studied to understand the effect of the silicon content in the hysteresis losses. The samples were annealed with different final annealing temperatures getting different grain sizes. Hysteresis loss and B50 were measured. The results of B50 showed no variation in texture between the alloys with different %SI. Finally, the results show no variation of the energy dissipated by hysteresis loss with variation of %Si
Os aços de grão orientado (GO) são utilizados em núcleos de transformadores. Este trabalho descreve o efeito do teor de carbono em aços GO produzidos pela tecnologia de baixa temperatura de reaquecimento de placas. Para isso, as propriedades magnéticas de duas amostras antes e após o envelhecimento foram calculadas. Obtiveram-se imagens aleatórias de contraste topográfico no microscópio eletrônico de varredura para fins de cálculos de fração volumétrica de precipitados plotados no Software Image J. Pelas análises realizadas, o efeito do envelhecimento das amostras não se diferenciou das amostras antes do tratamento térmico, razão dada pelos resultados das propriedades das amostras envelhecidas terem apresentado valores de perdas magnéticas semelhantes àquelas antes do envelhecimento.
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