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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
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/>
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.
횡자속형 2중 공극 영구자석 동기발전기의 마그네트 형상설계
최경호(K.H. Choi),김경식(K.S. Kim),진명철(M.C.Jin),황돈하(D.H. Hwang),배성우(S.W. Bae),김동희(D.H. Kim),노채균(C.G. Ro) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents a novel design technique and characteristic analysis of Magnet for dua1 air-gap axial-flux type permanent-magnet synchronous generator. The process of magnet design is applied to the motor design and steady state analysis considering output voltage waveforms and magnetic flux waveforms.<br/> Design and construction of an axial-flux permanent-magnet generator with power output at 60 [Hz], 300 [r/min] is introduced. Finite(FE) method is applied to analyze magnet shape characteristics. The results of FE analysis show generator is feasible for use with dual air-gap axial-flux permanent- magnet synchronous generator.<br/>
2相 Linear Stepping Moter의 진동특성에 관한 연구
이상호(S.H. Lee),김동희(D.H. Kim),정도영(D.Y. Jung),김춘삼(C.S. Kim),오홍석(H.S. Oh) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In this paper, a vibration suppression method using an energy stored in winding inductance and an induced voltage of the Linear Stepping Motor(LSM) is shown, and it is applied to a new one-phase excitation method. And a magnetic equivalent circuit is based on the structure of the LSM, and then the electric equivalent circuit of the LSM is derived by solving equations for the magnetic equivalent circuit. Several dynamic characteristics of the LSM are analyzed by the ACSL with the voltage equations, the force equations and the kinetic equation, and are measured by experimental system