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임피던스 성분을 이용한 매입형 영구자석 전동기의 고정자 절연파괴 고장의 초기 검출 기법
정채림(Chae-Lim Jeong),김경태(Kyung-Tae Kim),허진(Jin Hur) 대한전기학회 2013 전기학회논문지 Vol.62 No.5
This paper proposes an early diagnosis technique for the stator-turn fault (STF) in an interior permanent magnet (IPM)-type brushless DC (BLDC) motor using the impedance parameter. We have analyzed the varying characteristics owing to the STF through various experiments and the finite element method (FEM). As a result, we have presented a simple method for fault detection. This technique can be applied without requiring a fast Fourier transform (FFT) and the calculation of the negative-sequence impedance. The fault detection system works on the basis of the comparison the measured impedance with the database impedance. The variations in the characteristics owing to the STF as well as the proposed technique have been verified through the simulation and experiment.
영구자석 전동기의 불균일하게 자화된 자석에 따른 코깅토크 분석
이동호(Dong-ho Lee),정채림(Chae-lim Jeong),이승태(Seung-Tae Lee),허진(Jin Hur) 대한전기학회 2018 전기학회논문지 Vol.67 No.2
This paper investigated the effect of unevenly magnetized magnets to the cogging torque. First, through qualitative analysis of cogging torque, the generation of slot harmonic component is explained. Second, it is found that the slot harmonic can be suppressed by locating the magnets under specific condition even if the magnets are irregularly magnetized respect to each other. Finally, it is verified with the experimental result.
임준혁(Jun-Hyuk Im),박준규(Jun-Kyu Park),이승태(Seung-Tae Lee),정채림(Chae-Lim Jeong),허진(Jin Hur) 대한전기학회 2018 전기학회논문지 Vol.67 No.4
This study proposes the mitigation method of shaft voltage by varying the parasitic capacitance. First, the shaft voltage explained. Second, the parasitic capacitances causing shaft voltage are analyzed respect to geometry of motor and windings. Then, the equivalent circuit is established to obtain the shaft voltage and output torque characteristic and develope appropriate motor structure. Finally, simulation and experiment are conducted to verify that modified motor suppress the shaft voltage. This novel model does not require additional hardware.