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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.
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/>
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
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.
김무상,진경현,김동희.Moo-Sang Kim. M.D.. Kyung-Hyun Jin. M.D.. Dong-Hee Kim. M.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.7
Purpose: Iris cyst is a rare condition and there has been no Korean report of bilateral iris cyst. The authors present the first Korean report of a patient with bilateral iris cysts. Methods: A 62-year-old man presented with intermittent visual field disturbance of the left eye when exposed to bright light. The patient underwent visual field examination and slit lamp examination. On slit lamp examination, a dark-brown mass was revealed along the lateral pupillary margin in the left eye. In the right eye, the shape of the iris was convex at the 8 o`clock direction. Ultrasound biomicroscopy, confirmed the presence of a mass. Results: The patient showed no specific abnormality in visual field examination. Ultrasound biomicroscopy showed the objects to be cystic, with a thin-walled homogenous hypoechoic lesion on the posterior surface of the iris in both eyes. There were two cysts in each eye measuring 4.35 mm×1.13 mm and 1.47 mm×1.11 mm in the left eye, and 1.05 mm×1.02 mm and 1.90 mm×1.05 mm in the right eye. Conclusions: Asymptomatic iris cyst does not need to undergo treatment, but careful examination is nevertheless required required at regular intervals in case a complication develops.
김종무(J.M. Kim),정연호(Y.H. Jeong),강도현(D.H. Rang),임태윤(T.Y. Im),김동희(D.H Kim),이석규(S.G. Lee) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In the System-integrated modular advanced reactor (SMART), the motor for Control element drive mechanism(CEDM) requires high density power and simple drive mechanism to reduce volume because of restriction by install-space and must satisfy the reactor operating circumstances with high pressure and temperature.<br/> To Maximize the characteristics of the TFM, we chose the asymmetric bridge converter as the driving system for TFM. Because two switching devices are connected in series with the stator winding of each phases in the asymmetric bridge converter all the phases are not affected by another phase but controlled independently. Also, this converter has many advantages that the various control methods can be adopted, it is easy to control, and that in case that the switching devices of a phase are damaged, the affects can be minimized.<br/>