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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.
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.
이정효 ( Jung Hyo Lee ),최덕경 ( Duk Kyung Choi ) 東亞大學校附設 石堂傳統文化硏究院 2007 石堂論叢 Vol.0 No.38
이 논문은 고구려벽화고분 중에서도 동북아시아 지역에서 유일하게 남아있는 장천1호분 예불도에 출현하는 불상양식을 다각도로 분석한 것이다. 이를 위해서 중국을 비롯한 인접지역의 동시기 자료들을 중심으로 그 양식적 계보를 파악하여, 그 속에서 상이 가지는 시간 및 공간적 위치를 비정하고자 하였다. 비교분석 대상으로는 중국의 초기 금동불과 일부 출토품 등의 유물을 이용하였다. 결과적으로 벽화의 제요소는 하서지역과 관계가 있는 반면에 불상양식은 당시 삼연지역의 예들과 보다 밀접하게 연관되어 있음을 알 수 있었다. 그러나 불상이 고분의 벽화라는 구조 속에서 출현하고 있다는 점은 하서 및 삼연지역과 또 다른 특수성을 띄고 있다고 할 수 있을 것이다. 또한 주변지역 무덤의 예와 비교를 통해 고구려사회는 보다 불교를 적극적으로 받아들여 불교가 그들의 내세관에까지 깊숙이 자리하고 있음을 미루어 짐작할 수 있다. 분석결과에 따르면, 고구려고분벽화의 불교적 요소가 중원과는 다른 것을 알 수 있음은 물론이고, 장천1호묘 예불도 불상의 양식적 위치는 기원400년을 전후한 과도기적인 시기로 추정된다. The purpose of this study is to analyze in various ways the style of Buddhist Image of the Picture of Worship before the Image of Buddha in Jangcheon Tomb No. 1 which is the only one mural-painting tomb of Goguryeo remained in the Northeast Asia. For the purpose, this researcher tried to determine the spatiotemporal position of the image by investigating genealogical styles of contemporary, similar images found in neighboring regions including China. In addition, the researcher compared the image anaylzed here with earlier, gilt-bronze Buddhist sculptures and other unearthed articles and remains. Results of the study can be summarized as follows. All elements of the mural painting found in the above mentioned tomb have relation to Hexi(河西) region while, the style of the Buddhist Image found in the same place is closely related with sanyan(三燕) area. But the image is quite different from similar ones found in Hexi and Sanyan in that it was illustrated in the mural painting inside the tumulus. When compared with other tombs around it, the tumulus of Goguryeo clearly suggests that people of the nation positively accepted Buddhism and had their own view of the world beyond as deeply based on the religion. In conclusion, above all, it is clear that Buddhist elements mural paintings of Goguryeo`s tombs have are different from those of Zhongyuan(中原)`s. When its style is considered, then, the Buddhist Image of the Picture of Worship before the Image of Buddha in Jangcheon Tomb No. 1 may fall to a transition period around 400 A.D.
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.