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김창업 한국조명전기설비학회 2003 조명·전기설비학회논문지 Vol.17 No.6
최근 차세대 고용량 저장 매체 뿐 아니라 다양한 멀티미디어를 구현할 수 있는 디지털 다기능 디스크(DVD)의 개발에 가전 및 컴퓨터 업계의 노력이 집중되고 있다. 현재 국내에서 제작되고 있는 DVD 구동 모터용 마그네트는 소결 자석 부품을 조립하여 제작하고 있으며 조립에 따른 진동 및 소음 절감에 한계가 있다. 따라서 본 연구에서는 이 회전자를 일체형으로 제작함으로써 조립에 따른 가공 공차를 줄여 진동 및 소음을 줄이고자 한다. 이때 일체형으로 제작하기 위해서는 제품을 자장 중에서 사출해야 되며, 이 사출용 금형을 유한요소법을 이용하여 설계하고 이를 통한 제품의 특성을 실험치와 비교하였다. Recently. the efforts for the development of DVD concentrate on the high storage and multi-media. DVD has been manufactured by assembling many parts and it causes the vibration and noise. In this paper, one body rotor is proposed, which can make the nose and vibration be decreased. The injection mould for DVD rotor is designed by finite element analysis and the rotor is manufactured in the mould. The magnetic flux density is measured on the surface and it is compared with the design criteria.
용융금속을 2차측으로 하는 편측식 선형유도전동기의 특성해석
金昌業 湖西大學校工業技術硏究所 1999 工業技術硏究所論文集 Vol.18 No.-
This paper presents the characteristics analysis of a single-sided linear induction motor with secondary molten metals. The characteristics of a linear induction motor are analysed by the equivalent circuit method considering the end effects. For the verification of the analysis method, the locked test and load test with molten tin were made. The test results of locked test were compared with the simulations, and the velocity of the load test with molten tin showed 0.24[m/s] with air gap 30[mm] which is sufficient for transferring molten tin.
金昌業 湖西大學校工業技術硏究所 1999 工業技術硏究所論文集 Vol.18 No.-
Recently DVD(Digital Versatile Disk) has been used in many areas. This paper presents new type of rotor magnet for spindle motor in DVD. In the new type of DVD, the rotor magnet, turntable and back yoke are integrated by one body injection mold. The magnet is magnetized in the process of injection. The injection mold is designed using finite element method. And the characteristics of the rotor magnet are analysed and compared with the experiment.
원가절감을 위한 산업용 고압 유도전동기의 다중목적 형상 최적 설계
김창업,김민석 대한전기학회 2023 전기학회논문지 Vol.72 No.12
This paper is a study on the optimum design of industrial high-voltage induction motor for cost reduction using shape optimization method while maintaining the performance and volume of original motor. Flux-InHouseTool-HyperStudy is used to demonstrate the optimal design process for an induction motor, including stator slot shape, rotor bar shape, stator winding redesign, temperature, etc. This considers design variables that satisfy the design range and constraints based on the optimal design process operating system. As for the objective function of the optimal design, the optimal values of iron core, copper material cost, efficiency, power factor, starting torque, starting current, rated torque, rated current, and maximum torque are determined through multipurpose optimization using the GRSM algorithm. Through this optimization method, cost reduction was reduced by 6.95% compared to the basic model.
김창업,김성수 신라대학교 자연과학연구소 2003 自然科學論文集 Vol.11 No.-
Measurements of the concentrations of individual exhaust hydrocarbon species have been made under various engine operating conditions with a 2-liter 4-cylinder engine for natural gas and LPG. Tests were performed at constant engine speed, 1800rpm for two compression ratios(8.6 and 10.6), with various operating parameters, such as excess air ratio(1.0~1.6), bmeps(250~800kPa) and spark timings(BTDC 10~55). It was found that the natural gas gave the less ozone formation than LPG in various operating conditions. This was accomplished by reducing the emissions of propylene(C_3H_6), which has relatively high MIR factor, and propane(C_3H_*) that originally has large portion of LPG. In addition, the natural gas show lower values in the SR and BSRs. Higher compression ratio showed higher NMHC emissions. However, SR decreased since fuel species of HC emissions increase. BSRs showed almost same values under high bmep, over 500kPa for both fuels. This means that effect of increasing of NMGC emissions and effect of decreasing of SRs with higher bmep affect each other simultaneously. With advanced spark timing, BSRs of LPG were increased while those of natural gas showed almost constant values.
김창업 湖西大學校工業技術硏究所 1998 工業技術硏究所論文集 Vol.17 No.-
In this paper, a magnetic field analysis of a bonded magnet roller for laser printer is presented. The magnetization direction of bonded magnet is decided by the flux distribution of injection mold during the manufacturing process. The injection mold is designed and analysed to fit design specification. The experiment shows that the flux distributions of magnet roller agree with the given specifications.
김창업 한국조명전기설비학회 2000 조명·전기설비학회논문지 Vol.14 No.4
본드자석을 사용한 마그네트 롤러의 배향은 사출시 금형내의 자화분포에 의해 결청된다. 본 연구는 본드자석올 사용한 레이저 프린터용 마그네트 롤러의 배향을 자기 해석을 이용하여 설계하고 이를 이용하여 마그네트 롤러를 제작, 측정한 결과이다. 제작한 비대칭 4극 마그네트 롤러에 대해 측정한 결과 제품의 주요 특성인 자극의 자속밀도 및 극간 각도가 설계치와 사양의 오차범위 내에서 만족함을 확인하였다. The magnetization direction of bond magnet is decided by the flux distribution of injection mold during the manufacturing process. The injection mold for the magnetic roller of the laser printer is designed and analysed to fit the design specification. The experiment showed that the flux distribution of a magnet roller agreed with the analysis and the given specifications.
선형유도전동기를 이용한 전자기 펌프의 특성해석 및 실험
김창업,전문호,권정태,임효재,Kim, Chang-Eob,Jeon, Mun-Ho,Kwon, Jeong-Tae,Lim, Hyo-Jae 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.6
본 논문에서는 선형유도전동기의 전자기력에 의해 용융 금속을 이송할 수 있는 전자기 펌프에 대하여 특성 해석 및 실험 결과에 대하여 제시하였다. 선형유도전동기에서 발생하는 전자기력과 전자수력학(MHD) 현상을 결합하여 용융 금속의 이송 특성을 해석하였다. 실험은 용융 아연을 대상으로 하였으며, 해석 결과와 비교 검토하였다. This paper presents the characteristics analysis and experiment of the electromagnetic pump using linear induction motor(LIM Pump) which can transfer the molten metals by the electromagnetic force. The characteristics of LIM Pump are analysed solving the magneto-hydro-dynamic(MHD) equation at various magnetic flux. The molten zinc is used in the experiment and the results we compared with the analysis.