http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
한상철,정세용,박병준,한영희,Han, S.C.,Jeong, S.Y.,Park, B.J.,Han, Y.H. 한국초전도학회 2012 Progress in superconductivity Vol.14 No.1
For the practical application of a YBCO superconductor bulk magnet, the superconductor bulk magnet with strong and stable magnetic field on a large area surface should be fabricated. To satisfy these requirements, we have designed a conduction-cooled bulk magnet system using six single grain YBCO bulk superconductors. Six rectangular-shaped YBCO bulk superconductors with a dimension of $38{\times}38{\times}15mm^3$ were field-cooled at 20 K using a superconductor magnet with maximum operating magnetic field of 4 T. The magnetic flux of 3.0 T and 2.8 T were achieved on the surface of bulk superconductors and over the vacuum chamber surface of the refrigerator, respectively.
5 kWh급 플라이휠 에너지 저장 시스템용 전자석 베어링의 성능평가
전세용(S. Y. Jung),한상철(S. C. Han),한영희(Y. H. Han),박병준(B. J. Park),이정필(J. P. Lee),박병철(B. C. Park) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
플라이휠 에너지 저장 시스템(FESS, Flywheel Energy Storage System)은 전기를 이용하여 플라이휠을 회전시켜 전기 에너지를 운동 에너지로 저장하는 기계식 축전지이다. 플라이휠 에너지 저장 시스템은 무접촉식 전자석 베어링, 고에너지밀도의 복합재 플라이휠, 고효율 전동/발전기 그리고 공기저항을 최화할 수 있는 진공챔버로 구성되어 있다. 특히 무접촉식 전자석 베어링은 플라이휠의 진동제어를 통하여 시스템의 효율과 안정성에 중요한 역할을 한다. 본 논문에서는 5 kWh급 플라이휠 에너지 저장 시스템용 전자석 베어링의 성능을 0.95 kWh급 스틸 로터를 이용하여 평가하였다. 0.95 kWh급 스틸 로터는 에너지 저장부인 복합재 휠부분을 제외한 나마지 사양이 5 kWh급 플라이휠과 동일하다. 5 kWh급 플라이휠보다 가속 및 감속이 더 용이한 0.95 kWh급 스틸 로터를 이용하여 운전속도인 9,000 rpm - 18,000 rpm에서 고속회전 운전하여 여러 주파수 대역에서 발생하는 진폭 등을 확인하여 진동제어를 담당하고 있는 무접촉식 전자석 베어링의 성능을 평가하고 그 결과를 5 kWh급 플라이휠 에너지 저장 시스템 운전에 적용하였다.
35 kWh급 플라이휠용 초전도 베어링의 댐핑 특성평가
박병준,정세용,한상철,한상진,이대화,한영희,Park, B.J.,Jung, S.Y.,Han, S.C.,Han, S.J.,Lee, D.H.,Han, Y.H. 한국초전도학회 2012 Progress in superconductivity Vol.14 No.1
Superconductor flywheel energy storage system (SFESs) is an electro-mechanical battery with high energy storage density, long life, and good environmental affinity. SFESs have been developed for application to a regenerative power of train, the storage of distributed power sources such as solar and wind power, and a power quality improvement. As superconductor bearing is completely passive, it is not necessary to control a system elaborately but accurate analysis in mechanical properties of the HTS bearing is very important for application to SFESs. Stiffness and damping properties are the main index for evaluation the capacity of HTS bearings and make it possible to adjust rotordynamic properties while operating the rotor-bearing system. The superconductor bearing consists of a stator containing single grain YBCO bulks, a ring-type permanent magnet rotor with a strong magnetic field that can reach the bulk surface, and a bearing support for assembly to SFESs frame. In this study, we investigated the stiffness and damping properties of superconductor bearings in 35 kWh SFESs. Finally, we found that 35 kWh superconductor bearing has uniform stiffness properties depend on the various orientations of rotor vibration. We discovered total damping coefficient of superconductor bearing is affected by not only magnetic damping in superconductor bulk but also external damping in bearing support. From the results, it is confirmed that the conducted evaluation can considerably improve energy storage efficiency of the SFESs, and these results can be used for the optimal capacity of superconductor bearings of the SFESs.
전자기력을 고려한 플라이휠 에너지 저장시스템용 전동발전기 구조해석
고우식(W.S.Ko),류동완(D.W.Ryu),오시덕(S.D.Oh),성태현(T.H.Seong),한상철(S.C.Han),한영희(Y.H.Han) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Flywheel Energy Storage System(FESS) consists of a high speed flywheel with an integral motor/generator suspended on non contact bearings and in an evacuated housing. Permanent magnet machines as the FESS motor/generator are a popular choice, since there are no excitation losses which means substantial increase in the efficiency. In this paper, the structural design method of rotor retainer for a high speed motor/generator are presented.
10 kWh급 초전도 베어링 회전자의 기계적 특성 평가
박병준,정세용,김철희,한상철,박병철,한상진,두승규,한영희,Park, B.J.,Jung, S.Y.,Kim, C.H.,Han, S.C.,Park, B.C.,Han, S.J.,Doo, S.G.,Han, Y.H. 한국초전도학회 2011 Progress in superconductivity Vol.13 No.1
Recently, superconductor flywheel energy storage systems (SFESs) have been developed for application to a regenerative power of train, a power quality improvement, the storage of distributed power sources such as solar and wind power, and a load leveling. As the high temperature superconductor (HTS) bearings offer dynamic stability without the use of active control, accurate analysis of the HTS bearing is very important for application to SFESs. Mechanical property of a HTS bearing is the main index for evaluating the capacity of an HTS bearing and is determined by the interaction between the HTS bulks and the permanent magnet (PM) rotor. HTS bearing rotor consists of PM and iron collector and the proper dimension design of them is very important to determine a supporting characteristics. In this study, we have optimized a rotor magnet array, which depends on the limited bulk size and performed various dimension layouts for thickness of the pole pitch and iron collector. HTS bearing rotor was installed into a single axis universal test machine for a stiffness test. A hydraulic pump was used to control the amplitude and frequency of the rotor vibration. As a result, the stiffness result showed a large difference more than 30 % according to the thickness of permanent magnet and iron collector. This is closely related to the bulk stiffness controlled by flux pining area, which is limited by the total bulk dimension. Finally, the optimized HTS bearing rotor was installed into a flywheel system for a dynamic stability test. We discussed the dynamic properties of the superconductor bearing rotor and these results can be used for the optimal design of HTS bearings of the 10kWh SFESs.
박병준,정세용,이정필,박병철,김철희,한상철,두승규,성태현,한영희,Park, B.J.,Jung, S.Y.,Lee, J.P.,Park, B.C.,Kim, C.H.,Han, S.C.,Du, S.G.,Sung, T.H.,Han, Y.H. 한국초전도학회 2009 Progress in superconductivity Vol.11 No.1
A superconductor flywheel energy storage(SFES) system is mainly act an electro-mechanical battery which transfers mechanical energy into electrical form and vice versa. SFES system consists of a pair of non-contacting High Temperature Superconductor (HTS) bearings with a very low frictional loss. But it is essential to design an efficient HTS bearing considering with rotor dynamic properties through correct calculation of stiffness in order to support a huge composite flywheel rotor with high energy storage density. Static properties of HTS bearings provide data to solve problems which may occur easily in a running system. Since stiffness to counter vibration is the main parameter in designing an HTS bearing system, we investigate HTS bearing magnetic force through static properties between the Permanent Magnet(PM) and HTS. We measured axial / radial stiffness and found bearing stiffness can be easily changed by activated vibration direction between PM and HTS bulk. These results are used to determine the optimal design for a 10 kWh SFES.