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- 저자 : 이정민(J.M. Lee) (검색결과 207 건)
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PMSM 의 벡터제어시 위치센서 오차에 의해 발생하는 토오크 리플에 대한 해석과 그 보상 방법
이정민(J.M. Lee),목형수(H.S. Mok),최규하(G.H. Choe),김상훈(S.H. Kim),조영훈(Y.H. Cho) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
Position information is very important when driving the Permanent Magnet Synchronous Motor(PMSM). Generally, resolver is used to obtain exact position information. However, it generates periodic position errors due to the transformer ratio difference and excitation signal distortion. When the vector control is done with the position information that includes position error, torque ripple is periodically generated. This paper proposes the solution through analysis of above problem. Also, it’s validity is verified by simulation and experiment.
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이정민(J.M. Lee),정상민(S.M. Jung),서인영(I.Y. Suh),한세희(S.H. Han),목형수(H.S. Mok),최규하(G.H. Choe) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
The phase angle of the utility voltage is used in current control of grid-tied fuel cell power converter. Therefore if the detection of phase angle is a problem, Current control is affected by the distorted phase angle. This paper presents a problem of synchronous reference frame PLL algorithm for single-phase systems and proposes compensated synchronous reference frame PLL algorithm. The proposed method helps power quality improvement of grid-tied fuel cell power converter under distorted utility conditions. Simulation and experimental results are presented to demonstrate the validity of the proposed method.
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이정민(J.M. Lee),김동명(D.M. Kim),정광식(K.S. Jeoung),한상택(S.T. Han),정원지(W.J. Jung),장주섭(J.S. Jang) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In this study, we develop analytical model of the load-sensing valve and analyze the system characteristics. In order to analyze characteristics of the pressure and flow and flow sharing of the load-sensing valve, test was performed on valve and vehicle. The authors studied the reliability of the analysis model by confirming the similarity of the analysis results and the test results before analyzing the characteristics of the system. Under the vehicle load conditions, The authors was performed evaluating effectiveness of the specific operation of the excavator.
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이정민(J.M. Lee),최준영(J.Y. Choi),김영욱(Y.W. Kim),이재홍(J.H. Yi),서영거(Y.G. Seo),서인영(I.Y. Suh) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
The 5㎾ SOFC(Solid Oxide Fuel Cell) System is composed to 3㎾ parallel Fuel Cell. We propose to the parallel control of 5㎾ PCS in the unbalance condition of fuel cell. The developed 5㎾ PCS can be found control ability of DC/DC converters in the operating conditions of the unbalanced parallel operation. It is verify to the control characteristics by simulation and experiment.
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다단 딮드로잉 공정에서 NIMONIC75 판재의 주름발생에 영향을 미치는 공정변수 평가
이정민(J. M. Lee),강상신(K. S. Kang),이정환(J. H. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
This study was designed to estimate the effects of process variables on wrinkling of NIMONIC 75 sheets in multi-stage deep drawing process. Process variables were a blank holding force (BHF), a die R, a punch R and drawing ratio. They were investigated for two stages deep drawing process. Effects of each variable were estimated using finite element method and a design of experiment.
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용체화 열처리된 Zn-22wt%A1 합금을 이용한 중공형 헬리컬 기어의 분말 압출
이정민(J.M. Lee),이경훈(K.H. Lee),고대철(D.C. Ko),김병민(B.M. Kim) 한국소성가공학회 2011 압출 및 인발 심포지엄 Vol.2011 No.8
This paper was designed to fabricate the hollow helical gear with pitch circle of 2.55 mm using extrusion process of a solution treated Zn-22wt%Al powder billet. Extrusion experiments were carried out under the following conditions: temperature, 250˚C, extrusion velocity, 0.1mm/min and mandrel diameter, 1.5mm. The mechanical properties of extruded helical gears were investigated by measurement of Vickers hardness, extrusion load and SEM observation.
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