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문재경(Jaegyeong Mun),곽예진(Yejin Kwak),윤해균(HaeKyun Yoon),김동훈(Dong-Hun Kim),양창섭(Chang-Seob Yang),정현주(Hyun-Ju Chung) 한국자기학회 2020 韓國磁氣學會誌 Vol.30 No.4
In this paper, the performance of the proposed closed-loop degaussing technique is analyzed through testing a mockup replicating a magnetic field condition of a ship due to the variation of on-board equipment’s or hull’s magnetization. In order to change a magnetic field condition of the mockup, a certain electric current is applied to triaxial coils installed in a nonmagnetic laboratory. Before and after the artificial field condition, degaussing current values are respectively derived from closed-loop degaussing algorithm and then applied to individual degaussing coils. The effectiveness of the proposed degaussing technique is verified by comparison of the magnitude of field signals generated on a certain depth of water.
고정자 권선의 절연 열화를 고려한 매입형 영구자석 동기전동기 평균 토크의 신뢰도 분석
문재경(Jaegyeong Mun),김동훈(Dong-Hun Kim) 한국자기학회 2023 韓國磁氣學會誌 Vol.33 No.6
In this paper, an efficient reliability analysis technique for the performance function of an electric motor is taking into account the insulation deterioration of stator windings as well as the uncertainty due to manufacturing tolerance. An insulation resistance formula is first derived to predict accurate insulation degradation over operating temperature and time, and then a precise numerical simulation model for a motor is constructed by utilizing the electromagnetic-thermal analysis tool linked to an equivalent circuit model. Based on the independence between probability design variables and time along with the simulation model, complex time-varying reliability analysis is converted into time-invariant reliability analysis. To examine the validity of the proposed method, the probability distribution and reliability of a performance function for an interior-type permanent magnet synchronous motor due to the manufacturing tolerance included in design variables are compared with and without consideration of insulation deterioration.
토크 손상식을 이용한 운전온도 변화에 따른 매입형 영구자석 동기전동기의 수명 예측
문재경(Jaegyeong Mun),곽예진(Yejin Kwak),김동훈(Dong-Hun Kim) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.1
In this paper, a torque damage equation due to the insulation aging of stator windings is proposed to predict the lifetime of a permanent magnet synchronous motor for operating temperature and use time. An insulation resistance equation for the motor is induced to replicate the winding deterioration of a stator under the given operating condition, and then an influence of insulation aging on torque performance of the motor is analyzed by means of an electromagnetic simulation tool. Based on numerical results, a torque damage equation is deduced to establish the relationship between insulation aging and torque deterioration according to the operating temperature and time of the motor. Finally, it is applied to an interior permanent magnet synchronous motor, and the lifetime limit of the motor is estimated for a certain operating temperature.
전력 케이블의 수트리 탐지를 위한 펄스 전파 특성법 기반 모의실험의 타당성 검증
임종수(Jongsu Lim),문재경(Jaegyeong Mun),강병수(Byungsu Kang),김동훈(Dong-Hun Kim),변진규(Jin-Kyu Byun),황보승(Seung Hwangbo),이동영(Dong-Young Yi) 한국자기학회 2019 韓國磁氣學會誌 Vol.29 No.3
In this paper, a finite element simulation using time domain reflectometry for detection of water trees in power cables is verified through an experimental test. For the purpose of doing this, a diagnostic pulse generator which can be internally charged up to a maximin voltage of 5 kV is first produced, and then the experimental setup equivalent to simulation conditions is realized. In order to examine simulation results, two-type artificial defects are created for a 6.6 kV distribution power cable, and reflected pulse signals are measured on each individual case. Finally, the validity of computer simulation for detection of water trees in power cables based on the pulse propagation characteristics is proved through a comparative analysis between simulated and experimental data of the concerned cable with and without the defect.