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가스분무법으로 제조한 MPP 분말코어의 자기적 특성에 미치는 열처리 효과
김구현(G. H. Kim),노태환(T. H. Noh),김광윤(K. Y. Kim),정인범(I. B. Jeong),최광보(G. B. Choi) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.4
The effects of heat-treatment with magnetic or non-magnetic field on magnetic properties of gas-atomized MPP dust cores subjected to various cooling processes after annealing were investigated. Upon magnetic-field annealing, ac permeability and core loss decreased with the increase of cooling rate, which were attributed to the generation of inhomogeneous internal stress and anomalous eddy current loss, respectively. It was not observed the formation of ordered phase and the related change in magnetic properties at the cooling stage for MPP dust cores. In MPP alloys, magnetic anisotropy was easily induced through the directional order, and permeability and core loss were changed under the conditions of low cooling rate and magnetic annealing.
가스 분무법으로 제조된 NixFe100-x(x=40~50) 퍼멀로이 분말 및 압분 코아의 자기적 특성
노태환(T. H. Noh),김구현(G. H. Kim),최광보(G. B. Choi),김광윤(K. Y. Kim) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.6
We investigated the magnetic properties of High Flux-type Ni_xFe_(100-x)(x=40~50, wt.%) permalloy powders and dust cores. The powder was prepared by conventional gas atomization in mass production scale. At the composition of Ni_(45)Fe_(55), saturation magnetization was maximum. In case of lower Ni content than X=45, the Ms decreased largely with the decrease in Ni content, which is due to the invar effect. The permeability of compressed powder cores increased with the decrease in Ni content, which was considered to be due to the decrease in the magnetostriction. In addition, the dust core with Ni=45% showed the lowest core loss because of the increase in electrical resistivity leading to the low eddy current loss. From the better frequency dependence of permeability, larger Q value and superior DC bias characteristics of Ni=45 % than those of Ni=50% core, it was confirmed that the 45%Ni-55%Fe powder alloy was better material for the dust core than commercial High Flux core materials.
인산염 피막처리 분말을 사용한 Fe - 6.0 wt%Si 합금 압분자심의 자기적 특성
장대호(D. H. Jang),노태환(T. H. Noh),김광윤(K. Y. Kim),최광보(G. B. Choi) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.5
Dust cores (compressed powder cores) of Fe-6.0 wt%Si alloy with a size of 35~180 ㎛ in diameter have been prepared by phosphate coatings and annealings at 600~900℃ for 1 h in nitrogen atmosphere. Further the magnetic and mechanical properties of the powder cores were investigated. As a general trends, the compressive strength and core loss decreased with the increase in annealing temperature. When annealed at 800℃, the compressive strength was 15 ㎏f, the permeability and quality factor were 74 and 26, respectively. Moreover the core loss at 50 ㎑ and 0.1 T induction was 750 ㎽/㎤, and the percent permeability under the static field of 50 Oe was estimated to be about 78. In addition, the cut-off frequency in the curve representing the frequency dependence of effective permeability was measured to be around 200 ㎑. These properties of the Fe-6.0 wt%Si alloy dust cores could be considered to be due to the good insulation effect of iron-phosphate coats, the decrease in magnetocrystalline anisotropy and saturation magnetostriction and the increase in electric resistivity.
주정규(J.K.Ju),안태영(T.Y.Ahn),장평우(P.W.Jang),정인범(L.B.Jeong),최광보(G.B.Choi) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper present an investigation of the influence on the PFC(power factor correction) circuit with characteristics variation of MPP (Molybdenum permalloy powder) core. The experiment results of the 1.5kW class Boost converter for PFC rectifier with the average current mode control are evaluated to verify the influence on the PFC converter with inductance variation of the MPP core. As a results, it is shown that the ripple of the inductor using a MPP core increase with output power of the converter.