Effect of Uneven Surface on Magnetic Properties of Fe-based Amorphous Power Transformer

Authors: Chang-Hung Hsu, Yeong-Hwa Chang, Chun-Yao Lee, Chia-Shiang Yao, Yan-Lou He, Huei-Lung Chu, Chia-Wen Chang, Wei-Shou Chan

Abstract:

This study reports the preparation of soft magnetic ribbons of Fe-based amorphous alloys using the single-roller melt-spinning technique. Ribbon width varied from 142 mm to 213 mm and, with a thickness of approximately 22 μm ± 2 μm. The microstructure and magnetic properties of the ribbons were characterized by differential scanning calorimeter (DSC), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and electrical resistivity measurements (ERM). The amorphous material properties dependence of the cooling rate and nozzle pressure have uneven surface in ribbon thicknesses are investigated. Magnetic measurement results indicate that some region of the ribbon exhibits good magnetic properties, higher saturation induction and lower coercivity. However, due to the uneven surface of 213 mm wide ribbon, the magnetic responses are not uniformly distributed. To understand the transformer magnetic performances, this study analyzes the measurements of a three-phase 2 MVA amorphous-cored transformer. Experimental results confirm that the transformer with a ribbon width of 142 mm has better magnetic properties in terms of lower core loss, exciting power, and audible noise.

Keywords: Amorphous ribbon, uneven surface, magnetic properties, and rapid solidification

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1074974

References:

[1] D. Azuma and R. Hasegawa, "Audible noise from amorphous metal and silicon steel-based transformer core," IEEE Trans. Magn., vol. 44, no. 11, pp. 4104-4106, Nov., 2008.
[2] E. N. Andreev, L. I. Chubraeva, "Investigation of a model HTSC transformer with amorphous alloy cores," J. Mate. Pro. Tech., vol. 181, no. 1-3, pp. 25-30, Jan., 2007.
[3] Y. Ogawa, M. Naoe, Y. Yoshizawa, et. al., "Magnetic properties of high Bs Fe-based amorphous material,"J. Magn. Magn. Mate., vol. 304, no. 2, pp. e675-e677, Sep., 2006.
[4] R. Hasegawa, "Applications of amorphous magnetic alloys," Mate. Sci. Eng. A, vol. 375-377, no. 15, pp. 90-97, Jul. 2004.
[5] N. Mattern, "Structure formation in liquid and amorphous metallic alloys," J. Non-Cry. Sol., vol. 353, no. 18-21, pp. 1723-1731, Jun., 2007.
[6] M. García del Muro, R. Zquiak, and X. Batlle, "The effect of quenching rate on the nanocrystallization of amorphous FeCuNbSiB,"J Magn. Magn. Mate.,vol. 171, no. 3, pp. 315-319, Jul., 1997.
[7] A. K. Panda, S. Roy, S. R. Singh, et. al., "Effect of quenching rate on the properties of melt-spun FeNbCuSIB ribbons,"J. Mate. Sci. Eng. A, vol. 304-306, no. 31, pp. 457-461, May, 2001.
[8] L. Kraus, O. Zivotsky, L. Postava, P. Svec, and D. Janiekovie, "Exchange Bias in Surface-Crystalline Fe-Nb-B Ribbons,"IEEE Trans Magne., vol. 44, no. 11, pp. 3875-3878, Nov. 2008.
[9] M. S. Leu and T. S. Chin, "Quantitative crystallization fraction and nano-grain size distribution studies of a FeCuNbSiB amorphous alloy," J. MRS Symp. Proc., pp. 557, 1999.
[10] W. M. Wang, Y. C. Niu, F. Wang, et. al., "Electrical resistivity evolution in the annealed amorphous Fe78Si9B13 ribbons," J. Non-Cry. Sol., vol. 354, no. 30, pp. 3612-3616, Jul. 2008.