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김동희(D.H.Kim),배동관(D.K Bae),김광헌(K.H.Kim),박현수(H.S.Park) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
Usually, the thrust of a Linear Pulse Motor(LPM) is calculated by magnetic equivalent circuit modelling method. Analytical thrust deviation exists to calculating magnetic flux density by using Permeance Modelling Method, Finite Element Method, and Velocity Electric Motive Force Method For calculating accuracy thrust by Using these every method. the thrust is calculated and compared by Lorentz Force Method, Magnetic Coenergy Method, And Maxwell correspondence force Method And that becomes Important factor at the comparison of each capacity and parameter of motor So this study wants to compare and analyze measurement data and calculating data of the static thrust of LPM and then we can get more accuracy method, calculating the static thrust of LPM.
횡자속형 영구자석 풍력발전기의 정상 및 과도상태 특성해석
황돈하(D.H. Hwang),강도현(D.H. Kang),김용주(Y.J. Kim),최경호(K.H.Choi),배성우(S.W. Bae),김동희(D.H. Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
The paper discuses characteristics of an axial-flux permanent-magnet generator for a gearless wind energy system which aims to be satisfied with variable operating conditions<br/> Design and construction of an axial-flux permanent- magnet generator with power output at 60 [Hz], 300 [r/min] for wind energy system is introduced. Finite-element method (FEM) is applied to analyze generator performance at variable load. The results of FE analysis show this generator is feasible for use with a wind turbine
디지털적으로 제어되는 플라이백 컨버터를 사용하는 BLDC 전동기 드라이브에 대한 연구
김남훈(N.H. Kim),백원식(W.S. Baik),최경호(K.H. Choi),황돈하(D.H Hwang),김민회(M.H. Kim),원재선,김동희(D.H. Kim) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
On this paper, digitally controlled flyback dc-dc converter and dc-ac inverter for bldc motor control are presented, which is used one processor. This system has 12V battery input for the flyback-converter, and the flyback-converter generates 30V output for BLDC motor inverter input. In order to compensate the flyback-converter, the transfer function of flyback converter is derived and digital PI compensator is adapted. Through bode diagram, stability of digital flyback-converter is analyzed. To verify the proposed system, digital simulation of the bldc motor drive using digital flyback-converter are performed.
황돈하(D.H. Hwang),박도영(D.Y. Park),김용주(Y.J. Kim),김동희(D.H. Kim),구자윤(J.Y. Koo),이인우(I.W. Lee) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this paper, the insulation characteristics test results of 25 low-voltage induction motors (3Φ, 5HP, 380V) are presented. Five different types of insulation techniques are applied to 25 motors. The maximum partial discharge (PD) magnitude (Qm), discharge inception voltage (DIV), dissipation factor tip-up (Δ tan δ), and rate of change in AC current (Δ I) are measured by PD and AC current tests Also, the insulation breakdown tests by high voltage pulse are performed, and the corresponding breakdown voltages are obtained.
IGBT PWM 인버터 구동 유도전동기의 절연성능 향상기술 연구
황돈하(D.H. Hwang),박도영(D.Y. Park),김용주(Y.J. Kim),이영훈(Y.H. Lee),김동희(D.H. Kim),이인우(I.W. Lee) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
The recent advancements in power electronic switching devices have enabled high frequency switching operation and have improved the performance of pulse-width modulated (PWM) inverters for driving induction motors. But, the insulation failures of stator winding have attracted much concern due to high dv/dt of IGBT PWM inverter. In this paper, the test results for evaluation on the stator winding insulation of low-voltage induction motors for IGBT PWM inverter applications are presented The insulation characteristics are analyzed with partial discharge and dissipation factor tests. Also, insulation breakdown tests by switching pulse voltage are performed. An effective insulation technique to enhance the insulation strength is suggested from the test results.<br/>
병아리의 단백질 및 에너지대사에 미치는 오크라톡신 A 가 함유된 사료의 영향
신동신(D . S . Sin),김동희(D .H . Kim),고태송(T . S . Koh) 한국축산학회 1991 한국축산학회지 Vol.33 No.4
In order to study an effect of diet contaminated with ochratoxin A (OA) on protein and energy metabolism of poultry, diets containing 0.0(basal). 1.0 and 2.0 ㎍ of OA per gram were fed to 13 day-old White Leghorn male chick during 10 days of experimental feeding period. Birds of 13-day old fed on diets incorporated with the OA tended to have the decrease of the daily weight gain and feed efficiency during experimental feeding period. Liver weight expresed per body weight was increased(p$lt;0.05) in birds fed the OA while kidney weight was hightened gradually as the OA levels of diet increased(p$lt;0.05). Retentions of lipids and energy were reduced(p$lt;0.05) in birds fed 2.0 ㎍ of OA per gram diet. The percentage of nitrogenous compounds in urine was not affected by the experimental diets, and increased excretion of nitrogen in urine and feces, and decreased digestibility of protein and nitrogen balance were shown in birds fed on the diet containing OA. An effect of diet containing the OA on the daily intake of energy was not found and heat production per metabolic body size(㎏^0.75) was increased significantly(p$lt;0.05) in birds fed the diet containing OA of 2.0㎍/g The results suggested that diets contaminated with the OA increase the kidney weight and heat production. and decrease retention of lipids in birds.
김주헌(J . H . Kim),김동희(D . H . Kim),김우정(W . J . Kim) 한국응용생명화학회 1994 Applied Biological Chemistry (Appl Biol Chem) Vol.37 No.1
Eight varieties of soybeans grown in Korea were investigated to compare chemical composition, protein dispersibility index (PDI) and some properties of soybean sprouts and tofu. The range of protein contents was 37.80∼40.43% where the Kyungdong 3 was the highest and Suwon 157 was the lowest, while the Bokwang was the lowest in lipid contents. The range of PDI was 71.6∼95.3% where the Kyungdong 3 was the highest and Suwon 162 was the lowest. The Kyungdong 3, Suwon 160 and Suwon 162 were significantly fast in growth rate of soybean sprout roots and the 100% of germination. The Kyungdong 3 was the highest in tofu yield and Suwon 146 was the highest in hardness. The organoleptic properties of tofu showed that L×2.3 ar d Suwon 162 was relatively high in cooked beany odor, while the Suwon 146 were the highest in elasticity and hardness. Even though Kyungdong 3 was found as the best for tofu and soybean sprouts processing, the black color of seed coat affected negatively on tofu color.