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가중치법을 이용한 SWE-SM(Slipring-less Winding Excited Synchronous Machine)의 다목적 최적설계
박지산(Ji-San Park),변진규(Jin-Kyu Byun) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.1
SWE-SMs (Slipring-less Winding Excited Synchronous Machines) have low price and sturdy rotor structure, and there are ongoing researches to use them for the drive units of EVs (electric vehicles) and e-Mobility. In this paper, the multi-objective optimization of an SWE-SM is investigated in order to improve its torque characteristics. The torque and back EMF (electromotive force) of an SWESM are calculated and analyzed using finite element simulations and Arkkio’s method considering nonlinear B-H curve of the core. In order to increase the average torque and decrease the cogging torque at the same time, the multi-objective optimization of SWE-SM is performed using the weighted sum method. Various ratios of the weighting factors of the multi-objective function are tested and the optimal solutions are analyzed to check the uniformity of the Pareto optimal points. The results show that the average torque and the cogging torque of an SWE-SM can be optimized effectively by adjusting the ratio of the weighting factors according to the preference set by the designer.
전력 케이블의 수트리(Water Tree) 탐지를 위한 펄스 전파특성 분석
최민수(Min-Soo Choi),박지산(Ji-san Park),변진규(Jin-Kyu Byun),김동훈(Dong-Hun Kim),황보승(Seung Hwangbo),이동영(Dong-Young Yi) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.2
In this paper, characteristics of propagated pulse signals are analyzed for detection of water trees in power cables using simulationbased TDR (Time Domain Reflectometry). COMSOL Multiphysics software is used for time-domain simulations of propagated pulse signals with high frequency components. The water trees with various penetration depths and lengths are modeled by axis-symmetry or 3D geometry, depending on the shapes of the water trees considered. The reflected waveforms and RMS values of the applied diagnostic pulse signals are analyzed according to the shapes and lengths of the water tree models and outer conductor conditions. Also, the propagation velocity of the pulse signal is calculated considering the material property of XLPE insulator in the cable, and the location of the water tree is obtained by checking the starting point of the reflected pulse. Furthermore, positional errors with respect to the actual positions of the water trees are calculated.