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이정효(Jung-Hyo Lee),이병국(Byoung-Kuk Lee),원충연(Chung-Yuen Won) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In motor driving, one of the most important consideration is the load characteristic and variation. Generally, the motor dirve should be made enough for the current by load variation, and it should be controlled by the load weight. However, the drum washing machine's load variation is irregular and large. Therefore, we want to make the motor drive that considering this load pattern, this paper describes the drum washing machine's load pattern modeling by the mathematical theory.
이정효(Jung-Hyo Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.3
This paper proposes a interpolation error compensation method for PMSM torque control. In PMSM torque control, two dimensions look-up table(2D-LUT) is used for current reference generation due to its stable and robust torque control performance. However, the stored data in 2D-LUT is discreet, it is impossible to store all over the operation range. To reduce the reference generation error in this region, the 2D-Interpolation method is conventionally used, however, this method still remains the error affected by the number of stored data. Besides, in the case stored by fixed unit, this error is increased in field weakening region because of the small number of stored data. In this paper, analyzing the cause of this interpolation error, and compensating the method to reduce this error. Proposed method is verified by the simulation and experiment.
3상 AC-DC 승압형 컨버터를 이용한 SOC 추정 기반의 효율적 배터리 충전 알고리즘
이정효(Jung-Hyo Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.9
This paper presents battery charging method using 3-phase AC-DC boost converter. General battery charging method is that charging the battery voltage to the reference voltage according to the constant current(CC) control, when it reaches the reference voltage, charging the battery fully according to the constant voltage(CV) control. However, battery chaging time is increased because of the battery impedance, constant current charging section which shoud take the large amount of charge is narrow, and constant voltage charging section which can generate insufficient charge is widen. To improve this problem, we proposes the method to reduce the charging time according to the SOC(State of Charge) estimation using battery impedance.
무녕왕릉(武寧王陵) 매지권문(賣地券文)의 "불종(不從)"과 "률령(律令)"
이정효 ( Jung Hyo Lee ) (재)동아시아문물연구학술재단 동아시아문물연구소 2011 文物硏究 Vol.- No.19
이 논고는 무령왕릉 지석에 나타난 매지권문 중 “不從律令”의 문구에 대해 한대 이후 육조의 묘지와 매지권에 대한 본격적인 비교와 검토를 통하여 관련용어와 개념을 정리하면서 이를 해석하고 검증하였다. 여기서 필자는 기존의 해석처럼 율령에 따르지 않는다고 해석하기보다 “不從” 과 “律令”을 개별적으로 이해하고 “不從”은 즉 종속되지 않는다는, 무령왕이 묘역의 주인임을 나타내는 것으로 해석함이 어떨까 하는 견해를 제시하면서 매지권문의 관용어구인 “律令”은 문서 말미의 종결어구로서 보다 강력한 알림과 선포의 의지를 나타내는 것으로 보는 것이 타당함을 피력하였다. 또한 앞에서 중국 매지권의 연원과 형식을 고찰해봄으로써 매지권이 동한이전시기 많이 나타나는 고지책(告地策)과의 연결고리를 형성하고 있다는 것과 함께 관련된 유사한 유물들의 용어를 정리하고 도식화하여 보다 명확하고 심도 있는 이해를 도모하였다. This argument what is "不從律令" 's phrase appears the record of a landowner for the deceased person inscribed on the stone epitaph-plaque King Muryeong’s tomb since Han Dynasty about six dynasty for that authentic comparison and review over the related terms and concepts to interpret this cleaned up and validated. Here I like the existing interpretation of the phrase does not comply with the than to interpret "不從" and "律令" individually, to understand and "不從" is or is not dependent on, King Muryeong is the landowner of area that displays this "律令" is concluded by the end of the document with the phrase of more powerful and declared willingness to represent the view expressed that this is reasonable. In addition, every time in front of China and consider the type of the opened by the record of a landowner for the deceased person inscribed on the stone epitaph-plaque when a previous present a lot of Bamboo & Wooden Slips df the tombs(告地策) and of the hook are formed with similar artifacts related to their terms and clearer than a graphical illustration and in-depth understanding of the fair.
역기전력 추정기를 이용한 전류 모델 기반의 SPMSM 센서리스 벡터제어
이정효(Jung-Hyo Lee),유재성(Jae-Sung Yu),공태웅(Tae-Woong Kong),이원철(Won-Chul Lee),원충연(Chung-Yuen Won) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
The current model based sensorless method has many benefits that it can be robust control for large load torque. However, this method should determine a coefficient of back electro motive force(back-emf). This coefficient is varied by load torque and speed. Also, the coefficient determining equation is not exist, so it is determined only by experiment. On the other hands, using only back-emf estimatior method can not drive in low speed area and it has weakness in load variation. For these problems, this paper suggests the hybrid sensorless method that mixes the back-emf estimator regarding saliency and the current based sensorless model. This estimator offers not only non-necessary coefficient for current sensorless model, but also wide speed area operating in no specific transition method.
DC-link 전압변동을 고려한 PMSM 토크제어의 성능 향상 방법
이정효(Jung-Hyo Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.11
This paper proposes a PMSM torque control method considering DC-link voltage variation and friction torque. In general EV/HEV application, two dimensions look-up table(2D-LUT) is used for reference current generation due to its stable and robust torque control performance. Conventionally, this 2D-LUT is established by flux-torque table to overcome the DC-link voltage variation. However, the flux table establishment is more complex than the speed table establishment. Moreover, one flux data reflects several speed conditions in variable DC-link voltage, friction torque cannot be considered by using the flux table. In this paper, speed-torque 2D-LUT is used for current reference generation. With this table, PMSM torque control is well achieved regardless of DC-link voltage variation by the proposed control method. Simulation and experimental results validate improvement of torque control error through friction torque compensation.