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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.
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.