• 제목/요약/키워드: 연자성체

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Application of High-Current PLC of Soft Magnetic Core Type Coupler (연자성체 코어형 결합기의 대전류 전력선통신 적용)

  • Jeong, Jae-Hwan;Yang, Seung-Ho;Soh, Kyung-Rak
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2018.05a
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    • pp.155-155
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    • 2018
  • In this study, we measured the communication performance of inductive coupler under high current condition. Ferrite and nanocrystalline cores were used to compare the available PLC communication range and bandwidth for current fluctuations.

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THE CHARACTERISTIC ANALYSIS OF SOFT MAGNETIC COMPOSITES FOR MOTOR CORE CONSIDERING CORE SHAPE (모터 코어용 연자성체의 형상별 특성 분석)

  • Lee, Kyu-Seok;Cha, Hyun-Rok;Yun, Cheol-Ho;Jung, Tae-Uk;Son, Hyun-Taek;Jeon, Seung-Kyu
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.240-241
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    • 2007
  • 연자성 분말의 독특한 특성은 3D 등방성 강자성체 이며, 이 때문에 3차원적 자속(flux)를 활용할 수 있어 전기 강판(sillicon steel)에 비해 3차원 성형시 유리한 장점을 가지고 있다는 점이다.[1] 따라서 본 논문에서는 연자성 분말 (Soft Magnetic Composites)의 3차원 성형시 각 성형 형태에 따른 압분 시료의 전기적, 기계적 특성에 대한 연구를 하였다. 연자성 분말의 코어 형상을 크게 ' '형으로 구분하여 압분 코어를 만든 후 압분 코어의 Overhang 각도 및 코어 Teeth의 길이에 따른 파라미터에 변화를 주어 철손 및 경도, 밀도를 측정 하였다. 이 논문에서 우리는 3차원 코어 성형시 전기적, 기계적 특성이 가장 우수한 코어 성형 조건을 연구해 낼 수 있었다.

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Meander type magnetic field sensors using amorphous ribbon (아몰퍼스리본을 이용한 미안더타입 자계센서)

  • K. H. Shin;J. Hur;G. Sa-Gong;Kim, Y.;J. Cho
    • Proceedings of the Korean Magnestics Society Conference
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    • 2002.12a
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    • pp.230-231
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    • 2002
  • 고주파전류가 통전되고 있는 연자성체에 외부자계가 인가되면 자성체의 표피효과(Skin effect)에 의해서 임피던스가 변화하게 된다. 따라서 고주파의 정전류를 통전시키면 자성체의 양단에서 전압의 크기는 외부에서 인가되는 자계에 따라 변화하게 되는데, 이 때의 전압을 자계로 환산함으로써 자계의 검출이 가능하다. 이러한 현상을 이용하여 자계를 검출하는 소자를 자기임피던스 센서(Magneto-Impedance sensor)라고 한다$^{1.2}$ . 자기임피던스 센서는 주로 연자성이 우수한 아몰퍼스 자성체를 이용하여 구성되고, 구조가 간단하며, 극히 우수한 자계 검출능력을 나타내므로, 차세대의 고감도 자계센서로서 주목을 받고 있다. (중략)

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Effect of Residual Impurity on Magnetic Properties of the Permalloy Soft Magnet by Powder Injection Molding (분말사출성형으로 제조된 퍼말로이 연자성체에서 잔류 불순물이 자기특성에 미치는 영향)

  • 정원용;최준환;정우상
    • Journal of the Korean Magnetics Society
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    • v.10 no.6
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    • pp.291-296
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    • 2000
  • The manufacturing method of permalloy soft magnet with the Ni contents of 46.6 and 47.2 wt% was investigated by powder injection molding technology. The magnetic properties of permalloy were greatly affected on the residual carbon and oxygen content of the sintered magnet. Solvent extraction and thermal debinding process to minimize the residual carbon content in sintered magnet were developed by controlling the debinding atmosphere. The residual carbon content depends on the debinding condition of the binder system for powder injection molding and the residual oxygen content on the sintering atmosphere. The sintered magnet produced by powder injection molding process had a 50 ppm. residual carbon, 150 ppm. residual oxygen. The coercivity and maximum relative permeability of permalloy soft magnet were 0.46 Oe and 14,600 respectively.

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Crystallographic and magnetic properties of (CoFe2O4)1-X(Y3Fe5O12)X ((CoFe2O4)1-X(Y3Fe5O12)X 분말의 구조적 특성과 자기적 특성)

  • Lee, Jae-Gwang;Chae, Kwang-Pyo;Jang, Joon-Sik;Lee, Sung-Ho;Lee, Yong-Bae
    • Journal of the Korean Magnetics Society
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    • v.13 no.1
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    • pp.1-5
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    • 2003
  • Magnetic and structural properties of $(CoFe_2O_4)_{1-x}(Y_3Fe_5O_{12})_x$ powders (0 $\leq$ x $\leq$ 1) grown by a conventional ceramic method were investigated using X-ray diffractormeter (XRD), scanning electron microscopy (SEM), Mossbauer spectroscopy and vibrating sample magnetometer (VSM). The XRD results for the powders annealed at 120$0^{\circ}C$ indicated that no other peak was observed except for the ones from cobalt ferrite and the garnet powder. SEM micrographs indicated that cobalt ferrite and garnet powders were aggregated and completely formed together. It was hard to identify which part of the powders was the garnet or the cobalt ferrite. Mossbauer spectra for powders grown separately and mixed mechanically consisted of sub-spectra of cobalt ferrite and garnet, however, powders annealed together had an extra sub-spectrum, which was related with the interaction between iron ions at the grain surfaces of cobalt ferrite and the garnet: cobalt ferrite and garnet particles were located very closely. The value of the saturation magnetization measured by a VSM as a function of composition ratio agreed very well with the ones based on the theoretical calculation.

Therapeutic Effect of Pipemidic Acid on OMPC (만성중이염에 대한 Pipemidic Acid의 치료효과)

  • 장인원;이종원;정종진;조용범;국태진;이정헌;염시경;김종욱;조재식
    • Proceedings of the KOR-BRONCHOESO Conference
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    • 1981.05a
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    • pp.39.2-39
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    • 1981
  • Recently, there has been many problems in the treatment of OMPC, because of inadequate and abuse of antibiotics, and resistant strain of pathogenic organisms to antibiotics. Authors studied on the culture and sensitivity of otorrhea obtained from 50 patients with OMPC, and evaluated the therapeutic effect of PPA, which is a new derivative of piromidic acid and active against gram (-) bacteria including pseudomonas aeruginosa as well as some gram (+) bacteria. We observed good therapeutic effect on OMPC with pseudomonas and other gram (-) bacteria, and considerable effect on OMPC with gram (+) bacteria.

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