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Microstepping with PI Feedback and Feedforward for Permanent Magnet Stepper Motors
Wonhee Kim,Induk Choi,Chung Choo Chung 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, the stability of microstepping is investigated via Lyapunov method. Microstepping with proportional integral (PI) feedback and feedforward is proposed for the position tracking of a Permanent Magnet (PM) stepper motor. Given static inputs to the two phase PM stepper motor, it is proven that the stability of equilibrium points is guaranteed by LaSalle’s theorem. For position tracking, the relationships between the voltage input and current output of each phase for the position tracking are derived. From the relationships, microstepping with PI feedback and feedforward is developed for the position tracking. Experimental result shows that the position tracking performance of the proposed controller is improved compared to conventional microstepping.
채석준(Sukjun Chai),황인덕(Induk Hwang),허순호(Sunho Heo),최승찬(Sungchan Choi) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The major advantage of B pillarless sliding door type vehicle is practicality through maximizing interior space and a performance to get on and off. But it is quite difficult to satisfy the body stiffness because of B pillarless concept and the body sealing of sliding door body rail box. This paper will give history information about satisfying the goal of the body stiffness and sealing. In addition, this paper will mention inportant design factors which should be considered to develop this kind of body.
유압 모터 위치 제어를 위한 High gain observer에 기초한 Passivity based Controller
김원희(Wonhee Kim),최인덕(Induk Choi),강동규(Dong Gyu Gang),신동훈(Donghoon Shin),원대희(Daehee Won),정정주(Chung Choo Chung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문에서는 passivity based controller에 high gain observer를 접목시킨 유압 모터의 위치 제어기를 제시 한다. 본 논문에서는 5차 비선형 동역학 모델을 사용 하였다. Passivity based controller 는 유압 모터의 높은 위치 추정능력을 구현하지만 그것을 위해서는 유압 모터의 상태 및 부하의 정보를 알아야 한다. 상태 및 부하의 정보를 추정 하기 위하여 high gain observer를 제안하였다. High gain observer을 사용함으로서 유압 모터와 부하의 동역학의 비선형성을 줄여 상태 및 부하를 효과적으로 추정 하였다. 유압 모터의 위치 제어 성능 및 부하의 관측 능력 평가를 위하여 Matlab/Simulink를 이용하여 모의 실험을 구현 하였다.
Wonhee Kim,Jongpyo Han,Induk Choi,Chung Choo Chung 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, iterative learning control (ILC) with field oriented control is proposed to reject periodic velocity ripple which are casually detent torque and other various sources in permanent magnet stepper motor(PMSM). Singleinput single-output (SISO) system structure with field-oriented control (FOC) is proposed to be applied to ILC. To make the error convergence fast, current error based ILC using plant inversion method is designed. The condition that error converges to zero is derived. Simulation results show that the velocity ripple is cut in by using ILC.
Development of SCAR Markers for Korean Wheat Cultivars Identification
( Son Jae Han ),( Kyeong Hoon Kim ),( Sang Hyun Shin ),( Induk Choi ),( Hag Sin Kim ),( Young Keun Cheong ),( Choon Ki Lee ),( Sung Il Lee ),( Ji Yeong Choi ),( Kwang Geun Park ),( Chon Sik Kang ) 한국육종학회 2014 Plant Breeding and Biotechnology Vol.2 No.3
Amplified fragment length polymorphism (AFLP) is a molecular marker technique based on DNA and is extremely useful in detection of high polymorphism between closely related genotypes like Korean wheat cultivars. Six sequence characterized amplified regions (SCARs) have been developed from inter simple sequence repeat (ISSR) analysis which enabled the identification and differentiation of 13 Korean wheat cultivars from the other cultivars. We used six combinations of primer sets in our AFLP analysis for developing additional cultivar-specific markers in Korean wheat. Fifty-eight of the AFLP bands were isolated from EA-ACG/MA-CAC, EA-AGC/MA-CTG and EA-AGG/MA-CTA primer combinations. Of which 40 bands were selected to design SCAR primer pairs for Korean wheat cultivar identification. Three of 58 amplified primer pairs, KWSM006, KWSM007 and JkSP, enabled wheat cultivar identification. Consequently, 23 of 32 Korean wheat cultivars were classified by eight SCAR marker sets.
영구자석형 스테핑 모터의 코깅 토크 저감을 통한 속도 추종 성능 개선
강동규(Dong Gyu Gang),김원희(Wonhee Kim),최인덕(Induk Choi),신동훈(Donghoon Shin),정정주(Chung Choo Chung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
영구자석형 스테핑 모터 (Permanent Magnet Stepping Motor, PMSM)에서는 그 구조적 특징으로 인하여 필연적으로 코깅 토크 (cogging torque)가 발생한다. PMSM의 성능을 저하시키는 코깅 토크를 제거하기 위하여 Internal Model Principle (IMP)을 제안하였다. IMP를 사용하기 위해 Field-Oriented Control (FOC) 기반의 SISO 시스템을 구성하고 IMP를 PI 제어기에 병렬로 추가하였다. 모의 실험 결과로 코깅 토크로 인한 속도 리플이 효과적으로 제거됨을 보였다.
Comparing characteristics of agricultural and physiological of ‘Iksan370’ and ‘Keumkang’
Jae-Han Son,Kyeong-Hoon Kim,Sanghyun Shin,Young-Keun Cheong,Hag-Sin Kim,Induk Choi,Young-Jin Kim,Choon-Ki Lee,Kwang-Geun Park,Chon-Sik Kang 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Characteristics of agronomy, especially good yield productivity is very important in wheat (Triticum aestivum L.) as human food crop. Development of elite cultivar having good traits is required for food stability. In 2013, a new wheat line called Iksan370 has been developed by the National Institute of Crop Science, RDA. Iksan370 has hard red winter wheat characteristics and better features like resistance to biotic, abiotic stress and higher yield ability than Keumkang. Heading and maturing date were delayed about ten days and period to flowering date was shorter three or four days than Keumkang. Culm and spike length of Iksan370 were 95cm and 15.3cm, averagely. This means that culm and spike length were longer than Keumkang (79cm and 7cm, respectively). It showed higher milling rate (75.5%), protein content (13.5%) and SDS-sedimentation volume (77.5ml) than Keumkang. Genotypes of six genes, GBSSA, B, D, PPO18, Pina and Pinb, were represented that were similar to Keumkang, respectively. Average yield of Iksan370 in the preliminary trial test was 6.61 tons/ha in upland. We expect that yield productivity and farm income were increased by Iksan370.
Development of Molecular Marker for Korean Wheat Cultivar Identification using AFLP Technique
Jae-Han Son,Kyeong-Hoon Kim,Sanghyun Shin,Young-Keun Cheong,Hag-Sin Kim,Induk Choi,Young-Jin Kim,Choon-Ki Lee,Kwang-Geun Park,Chon-Sik Kang 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Amplified fragment length polymorphism (AFLP) is one of molecular marker technique based on DNA and is extremely useful in detection of high polymorphism between closely related genotypes like Korean wheat cultivars. Six Korean wheat cultivar specific marker sets have been developed from inter simple sequence repeat (ISSR) analysis and we can identify the 13 Koran wheat cultivars form other cultivars using six that (Son et al., 2013). We used four combinations of primer sets in our AFLP analysis for developing additional cultivar specific markers in Korean wheat. Twenty-one of the AFLP bands were isolated from ACG/M-CAC primer combination and 19 bands were isolated from E-AGC/M-CTG primer combination, respectively. We used forty bands to design sequence characterized amplified region (SCAR) primer pairs for Korean wheat cultivar identification. Only one of 40 amplified primer pairs, C2, were able to use for wheat cultivar identification. The DNA band of 215bp length was amplified by C2 primer pairs in ten cultivars, Eunpa, Olgeuru, Gobun, Saeol, Milsung, Sinmichal, Jokyung, Sugang, Goso, and Joah. Then C2 primer was applied to these primer sets as newly SCAR marker, six cultivars are identifying from other cultivars, additionally. Finally, to use the C2 and six primer sets, 19 Korean wheat cultivars are identified.