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한성진 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.2
Comparing to the conventional machines, the superconducting generator has many advantages such that the efficiency is increased about 0.5-1.0%, the size and the weight are decreased about 40%, and the Critical Fault Clearing Time is increased. Due to the above merits, many countries are studying to set up the design methods or manufacturing prottype machines. The superconducting generator has the double shield cylinder between the superconducting field winding and the armature winding. The outer is called the damper shield, the inner the electrothermal shield. The damper shield lays the role of the reduction of the damping effect from the armature reaction asynchronous mangnetic field. And the electrothermal shield is to keep the superconducting field winding under th critical field and he critical temperature. This paper deals with the electromagnetic force distribution on the double shield damper of the superconducting generator using Finite Element Method, and compared the output powers with the theoretical values. The results agreed well, and is respected to e used in the design process of the superconducting generator.
韓聲鎭 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1
Numerous papers and other works have been published in recent years on the boundary element method. One of the more interesting features of the boundary element method is the simplicity of the input data required to run a problem. This is a very important point in practice as many man-hours are lost in preparing and checking finite element data. This paper deals with the magnetostatic field problem using boundary element method. A simple 2-D model is considered to analyze the vector potential via boundary element method. And the results are compared with those of finite element method and analytic solution. In conclusion, the boundary element method is expected to present great advantages in the analysis for complex 3-D bodies and problems with boundaries at infinity.
한성진,주수원,사재원 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
In recently, a lot of research works on the biological effects due to EMF(Electromagnetic Fields) on human health have been reported. Most of electric facilities in a substation are the main source of magnetic fields. In particular, the more the current flows through conductor is, the greater the magnetic fields which produced by current become. And the magnetic fields depend on the geometries of electric utility facilities etc. This paper presents the measurement of magnetic fields in 345/154KV outdoor substation and the modeling of electric utility facilities which are complex electric facilities into simplified ones. The magnetic fields profiles obtained from the computer simulation are compared to those from measurements. The result of this paper will be available to basic information to reduce the level of EMF from the electric utility facilities.
한성진,주수원,전형태,사재원 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
For two decades and more, a lot of research work on the bioligical effects of EMF(Electromagnetic Fields) on Human health have been reported. Power-frequency magnetic fields are a natural consequence of the flow of electricity. This paper deals with the modeling of electric facilities taking into account the line geometries. The magnetic fields profiles obtained from the computer simulation are compared to those from measurements.
한성진 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.1
The demand for electric power has increased greately, but further increases in unit ratings using conventional design methods are becoming increasingly difficult. The use of a superconducting winding leads to increased efficiency, increased power output per meter, elimination of the magnetic circuit, and potential for growth to higher ratings. This paper deals with the magnetic vector potential distribution and the induced electromotive force of a superconducting ac generator. The finite element analysis of a superconducting generator gives more accurate results than the equivalent circuit modeling analysis. The obtained flux pattern and the calculated electromotive force will be the basis of the advanced study for the design and analysis of a surperconducting generator.
韓聲鎭 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1
This paper deals with the calculation of forces for three-dimensional axisymmetrical magnetostatic problem. In general, it is well known that there are two different methods to calculate the force acting on an iron body placing in the electromagnetic (E.M.) fields. The one is usually expressed in terms of stored energy variation and the other Maxwell stress tensor. It is necessary to solve the whole system matrix when using the method of stored energy variation, but with Maxwell stress tensor studied in this paper, it is possible to reduce the problem size, since calculation is needed only in the region of integration paths. And, assuming the θ-directional current, the analysis can be done as that of two-dimensional problem. The results clearly show the merits of this method and can be applied to the computer aided design of electric machinery.