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충진제와 실란처리에 따른 에폭시 복합체의 파괴시간 예측
신철기,Shin, Cheol-Gi 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.9
In this paper, the long time breakdown characteristic of the epoxy composite, which is widely used in the insulation system for high voltage application, was estimated with Weibull distribution. In the procedure of the estimation, the short time breakdown characteristics for the epoxy composite specimens, which were made with the variation of hardener and/or filler, were tested firstly. Then the long time voltage-to-time test was implemented. Finally, the long time breakdown voltage of each specimen was estimated with the parameters obtained from the statistical treatment with Weibull distribution. Base on the results, it has been found that the optimal weight ratio of epoxy resin/hardener/filler that has the excellent long time breakdown characteristic was 100/100/65. It was due to the silane treatment which relieves the electric field at the interface between filler and epoxy.
Bi(Pb)SrCaCuO 초전도체의 초전도특성에 미치는 분말소결 및 2차성형, 분쇄시간에 따른 영향
신철기,김영천 한국전기전자재료학회 1994 電氣電子材料學會誌 Vol.7 No.4
In this study, the influence of the powder sintering, the 2nd sinteiing and the grinding time on the Superconducting properties in the Bi(Pb)SiCaCuO Superconductor has been studied. From the analysis of SEM and XRD patterns, it was known that the sample prepared by the process of powder sintering has a porous microstructure with the critical temperature(Tc) below 77K, while the sample prepared by the 2nd sintering has a highly oriented microstructure with the Tc above 100K. The Critical Current Density(Jc) of the sample prepared by the 2nd sintering was better than the sample prepared by the process of powder sinteiing, but it's Jc, was low in practical use. Also, the effect of grinding time from 0[min] to 120[min] was investigated. As the grinding time is increased, the samples degraded from high-Tc phase to low-Tc phase and nonsuperconducting phases.
신철기,김진사,Shin, Cheol-Gi,Kim, Jin-Sa 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.10
This paper tried to develop a BLDC electric motor securing the 800 W-level watertight structure for driving the outboard motor. For this purpose, this paper developed a high-efficient controller-integrating BLDC electric motor system for underwater propulsion and designed and developed a triple watertight structure. Besides, this study developed a outboard motor integrating motor, propeller and controller based on the production of a controller for BLDC motor which can the speed control by selecting low-voltage, high-current power element. The characteristics of developed outboard motor were 24 V input voltage, over 800 W motor output, and max. 3,000 rpm motor, and 84.9% motor efficiency, and the developed outboard motor could secure the watertight structure in 5 m in water depth.
와이블 분포식을 이용한 에폭시 복합체의 수명 시간 예측
신철기,김진사,정일형,임장섭,김태성,이준웅 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.3
In order to estimate the life time of epoxy composites used for modeling material of transformer, the AC breakdown experiments of it were experimented and then the AC breakdown data were also simulated by Weibull distribution equation in this study. The life time of H100F65 specimen was the shortest and it of SH100F65 specimen was the longest, and as the AC voltage was applied to specimen for 50[min], the breakdown probability of each specimen was 31.2[%], 17.00[%], 84.36[%] and 12.35[%], respectively.
Electromagnetic Field Analysis of Magnetic Bearing due to Stator Structure
김기준,신철기,Kim, Ki-Joon,Shin, Cheol-Gi The Institute of Electronics and Information Engin 2011 電子工學會論文誌 IE (Industry electronics) Vol.39 No.4
본 연구에서는 스테이터 구조에 의한 마그네틱 베어링의 전자장해석을 수행하였으며 AMB 시스템의 설계 기준을 얻기 위하여 3가지 방식의 구조에서 전기적 특성을 구하였다. FEM 기법을 이용하여 AMB의 3가지 방식을 시뮬레이션한 결과, 1, 2, 그리고 3번 방식은 N극에서 S극으로 많은 자속선 벡터가 이동하는 것으로 나타났으며, 이 자속선들은 로타로 전달되고 있다. 이 선들은 로타가 회전하는 것을 도와주고 있다. 따라서, 이러한 전기적 특성 자료는 마그네틱 베어링 설계자료로 이용되고, 설계 기준을 만드는데 도움이 될 것이다. In this study, it carried out Electromagnetic Field Analysis of Magnetic Bearing due to stator structure and it got the electrical characteristics of 3 structure types of AMB(Active magnetic bearing) systems to get optimal design criteria. The results of simulation in three types of AMB, using FEM method, type 1, 2, and 3 had many paths to move magnetic flux vectors from N pole to S pole and magnetic flux lines are transferred to rotor as a shaft. The paths help to rotate the rotors. So, their data of electrical properties carry out design of magnetic bearing system and the data help to make design criteria.
다양한 열처리 분위기에 따른 SBT 커패시터의 전기적 특성
조춘남,김진사,신철기,최운식,김충혁,홍진웅,이준웅 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.3
The Sr$\_$0.7/Bi$\_$2.6/Ta$_2$O$\_$9/(SBT) thin films are deposited on Pt-coated electrode(Pt/TiO$_2$/SiO$_2$/Si) using RF magnetron sputtering method. The structural and electrical properties of SBT capacitors were influenced with annealing atmosphere. In the XRD pattern, the SBT thin films in all annealed atmosphere had (105) orientation. In the SEM images, Bi-layered perovskite phase was crystallized in all annealing atmosphere and grain largely grew in oxygen annealing atmosphere. The maximum remnant polarization and the coercive electric field in oxygen annealing atmosphere are 12.40[${\mu}$C/cm$^2$] and 30[kV/cm] respectively. The dielectric constant and leakage current density of capacitors annealed oxygen atmosphere are 340 and 2.13${\times}$10$\^$-9/ [A/cm$^2$] respectively. The fatigue characteristics of SBT capacitors did not change up to 10$\^$10/ switching cycles.
열처리온도에 따른 $(Sr_{0.85}Ca_{0.15})TiO_3$박막의 구조 및 특성
김진사,조춘남,신철기,최운식,김충혁,이준웅 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.10
The (S $r_{0.85}$C $a_{0.15}$)Ti $O_{3}$(SCT) thin films are deposited on Pt-coated electrode (Pt/TiN/ $SiO_2$/Si) using RF sputtering method. The composition of SCT thin films deposited on Si substrate at woom temperature is close to stoichiometry(1.102 in A/B ratio). The maximum dielectric constant of SCT thin films is obtained by annealing at 600[$^{\circ}C$]. The capacitance characteristics had a stable value within $\pm$4[%]. The drastic decrease of dielectric constant and increase of dielectric loss in SCT thin films is observed above 200[kHz]. SCT thin films used in this study show the phenomena of dielectric relaxation with the increase of frequencey.cey.
김진사,조춘남,신철기,최운식,김충혁,이준웅 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.9
The (S $r_{0.85}$C $a_{0.15}$) Ti $O_3$(SCT) thin films are deposited on Pt-coated electrode (Pt/TiN/ $SiO_2$/Si) using RF sputtering method at various deposition temperature. The crystallinity of SCT thin films were increased with increase of deposition temperature in the temperature range of 200~500[$^{\circ}C$]. Also, the composition of SCT thin films were closed to stoichiometry (1.080~1.111 in A/B ratio). V-I characteristics of SCT thin films show the increasing leakage current with the increases of deposition temperature. The conduction mechanism of the SCT thin films observed in the temperature range of 25~100[$^{\circ}C$] can be divided into four regions with different mechanism by the increasing current. The region I below 0.8[MV/cm]shows the ohmic conduction. The region II between 0.9~2[MV/cm] is in proportion to J∝ $E^{1.5}$ , the region III between 2~4[MV/cm] can be explained by the Child’s law, and the region IV above 4[MV/cm]is dominated by the tunneling effect.ect.