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Preisach 모델을 이용한 수직자기기록장치의 재생특성 해석
박관수(G. S. Park),이향범(H. B. Lee),한송엽(S. Y. Hahn),이택동(T. D. Lee),장평우(P. W. Jang) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
Numerical method for analyzing the reading process in magnetic recording system is described. Hysteresis characteristics must be included in numerical analysis not only recording process but also reading process because of hysteretic behavior of recording media. Algorithm which is consisted of finite element method for numerical analysis and Preisach model considered to be more appropriate method than Stoner-Wohlfarth model with spin curling mode for describing hysteresis characteristics is constructed. Equations to calculate waveform of reproduced voltage is proposed. Then, this is applied to perpendicular magnetic recording systems with pole type head and double layer media. Waveform of magnetic flux density and reproduced voltage induced in head coil is obtained. If the recording current increase in recording process, magnitude of reproduced voltage in reproducing process saturates. From this saturation curve, value of current which produce maximum voltage can be obtained.
수직자기 기록장치에서 기록밀도가 재생전압에 미치는 영향
박관수(G. S. PARK),이향범(H. B. LEE),한송엽(S. Y. HAHN),이택동(T. D. LEE),장평우(P. W. JANG) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.2
The method for analyzing the recording and reading process of magnetic recording system by numerical simulation is introduced, which can simulate the effect of elements of the magnetic recording system. During the whole simulation, hysteresis characteristics must be included. Preisach model and finite element method are used to construct the algorithm. From the wave of recording current, recorded pattern of magnetization in recording media is simulated in recording process, and then waveform of reading signal in head coil is obtained in reading process. To show the validity of this method, this is applied to perpendicular magnetic recording system. Waveform of recording signal and reproduced signal is obtained in several density. Pattern of reproduced voltage magnitude according to increase of recording density shows roll-off curve.
1㎿ 급 초전도 모터용 고온초전도 계자코일의 전자기적 특성
백승규(S. K. Baik),손명환(M. H. Sohn),이재득(J. D. Lee),이언용(E. Y. Lee),권영길(Y. K. Kwon),문태선(T. S. Moon),박희주(H. J. Park),김영춘(Y. C. Kim),박관수(G. S. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
On the contrary of a conventional motor with very narrow air-gap, it is difficult to calculate the accurate magnetic field distribution and the performance of an air-cored superconducting motor by 2 dimensional analysis, which does not use high permeability material except outer machine shield. This paper aims to do analysis of magnetic field and force distribution from the 3 dimensional modelling of a 1㎿ class superconducting synchronous motor. Especially, the field coil composed of Bi-2223 high-temperature superconductor and the outer machine shield are modelled by finite element analysis software according to their structures and the self-inductance and Lorentz force are calculated based on the 3 dimensional magnetic field calculation.
3차원 자장 해석을 통한 1㎿ 급 고온초전도 모터의 특성 해석
백승규(S. K. Baik),손명환(M. H. Sohn),이재득(J. D. Lee),이언용(E. Y. Lee),권영길(Y. K. Kwon),문태선(T. S. Moon),박희주(H. J. Park),김영춘(Y. C. Kim),박관수(G. S. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Different from the conventional motor, the superconducting motor has so large air-gap that the actual parameters such as excitation voltage have considerable difference from the values obtained from 2-dimensional electromagnetic analysis. This paper introduces 3-dimensional EMCN(Equivalent Magnetic Circuit Network) method or FLUX - 3D FEM(Finite Element Method) software to reduce the error originated from the 2-dimensional electromagnetic analysis for the development of a 1 ㎿ class high-temperature superconducting motor.