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양재진(Jae-Jin Yang),이복용(Bok-Yong Lee),이기식(Ki-Sik Lee) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.2
Electric machines such as motors which have moving parts are designed for producing mechanical force or torque. The accurate calculations of electromagnetic force and torque are important in the design these machines. Electromagnetic force calculation method using the results of Finite Element Method(FEM) has been presented variously in 2-D problems. Typically the Maxwell’s Stress Tensor method and the method of virtual work are used. The former calculates forces by integrating the surface force densities which can be expressed in terms of Maxwell Stress Tensor(MST), and the latter by differentiating the electromagnetic energy with respect to the virtual displacement of rigid bodies of interest. In the problems including current source, magnetic vector potentials(MVP) have mostly been used as unknown variables for field analysis by a numerical method: e. g. FEM. This paper, thus, introduces the two both methods using MVP in 3-D case. To verify the usefulness of presented methods, a solenoid model is chosen and analyzed by 3-D and axisymmetric FEM. It is found that the force calculation results are in good agreement for several mesh schemes.
이기식(Ki Sik Lee),이복용(Bok Yong Lee),양재면(Jae Myon Yang) 대한공업교육학회 1995 대한공업교육학회지 Vol.20 No.2
Automatic identification of regions is very important for the preprocessor of Finite Element Method. This paper describes an algorithm to identify the regions formed by given data of segments. Only segments are used as primitive elements for boundaries of regions. Without proof, several basic theorems are introduced and used to make a software algorithm. For easy understanding, a simple example is chosen. Figures and tables for each steps of the proposed algorithm are also presented.