• 제목/요약/키워드: HTS magnet

검색결과 194건 처리시간 0.03초

10 kWh급 초전도 플라이휠 베어링의 강성 평가 (Stiffness Evaluation of High Temperature Superconductor Bearing Stiffness for 10 kWh Superconductor Flywheel Energy Storage System)

  • 박병준;정세용;이정필;박병철;김철희;한상철;두승규;성태현;한영희
    • Progress in Superconductivity
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    • 제11권1호
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    • pp.57-61
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    • 2009
  • 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.

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초전도 저널베어링 Substator의 특성평가 (Static Properties of Superconductor Journal Bearing Substator for Superconductor Flywheel Energy Storage System)

  • 박병준;정세용;이정필;박병철;정년호;성태현;한영희
    • Progress in Superconductivity
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    • 제10권1호
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    • pp.55-59
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    • 2008
  • A Superconductor Flywheel Energy Storage System(SFES) mainly consists of a pair of non-contacting High Temperature Superconductor(HTS) bearings that provide very low frictional losses, a composite flywheel with high energy storage density. The HTS bearings, which offer dynamic stability without active control, are the key technology that distinguishes the SFES from other flywheel energy storage devices, and great effort is being put into developing this technology. The Superconductor Journal Bearing(SJB) mainly consists of HTS bulks and a stator, which holds the HTS bulks and also acts as a cold head. 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 SJB magnetic force through static properties between the Permanent Magnet(PM) and HTS. We measure stiffness in static condition and the results are used to determine the optimal number of HTS bulks for a 100kWh SFES.

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Efficiency evaluation and characteristics of receiver coil under different inserted resonance coils in wireless power charging system for MAGLEV

  • Chung, Yoon Do;Jeon, Haeryong
    • 한국초전도ㆍ저온공학회논문지
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    • 제20권1호
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    • pp.23-27
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    • 2018
  • As the wireless power transfer (WPT) technology based on strongly resonance coupled method realizes large power charging without any wires through the air, there are advantages compared with the wired counterparts, such as convenient, safety and fearless transmission of power. From this reason, the WPT systems have started to be applied to the wireless charging for various power applications such as train, underwater ship, electric vehicle. This study aims for the effect and characteristics of different inserted resonance coil between Tx and Rx coils for charging system of superconducting magnetic levitation (MAGLEV) train. The transfer efficiency and effect are evaluated with helix type, rectangular type copper resonance coil, and HTS resonance coil under bulb and HTS magnet load, respectively. The input power is adapted with radio frequency (RF) power of 370 kHz below 500 W.

고온초전도자석 충전용 초전도 스위치 및 전원장치에 관한 연구 (Study of a Superconducting Switch and Superconducting Power Supply for the Charging of Superconducting Magnets)

  • 배덕권;안민철;김영식;김호민;이찬주;윤용수;이상진;고태국
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2002년도 학술대회 논문집
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    • pp.318-321
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    • 2002
  • Superconductivity has various applications in the whole industry such as the generation of high magnetic field for medical care and diagnosis, the lossless power transmission, environment-friendly vehicles and clean energy storage systems. This paper deals with the High-Tc superconducting(HTS) power supply using heater-triggered switch for the charging of the superconducting magnets. HTS superconducting power supply consists of two heaters, an electromagnet, and Bi-2223 solenoid and Bi-2223 pancake is used as a superconducting load, similar to real HTS magnet. The timing sequential control of two heaters and an electromagnet is an important factor to generate pumping- current in the Bi-2223 load. The thermal analysis of switching parts of the Bi-2223 solenoid according to the heater input was carried out. Based upon the analysis, the 0.8A of heater current were optimally derived. The maximum pumping current reached 1.7A.

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Electromagnetic design of 10 MW class superconducting wind turbine using 2G HTS wire

  • Kim, J.H.;Kim, H.M.
    • 한국초전도ㆍ저온공학회논문지
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    • 제15권3호
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    • pp.29-34
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    • 2013
  • This paper introduces design processes of 10 MW class superconducting generator for wind Turbine. Superconducting generator can produce 5 times stronger magnetic field than permanent magnet at least, which enables large scale wind turbine to function as a lighter, smaller and more highly efficient system. These processes are targeted for higher efficiency and shorter high temperature superconductor (HTS) wires to fabricate 10 MW class superconducting generator. Three different approaches will be described in these design processes. First design process focuses on the number of rotor poles. Secondly, 270 and 360 A operating current of superconducting field coil can be adapted as a design parameter in this process. Lastly, 3 and 6 kV line to line voltage of stator coil will be used to design 10 MW class superconducting generator.

SMES용 고온초전도 전류도입선의 전자계 해석 및 형상설계 (The Electromagnetic Field Analysis and the Design of HTS Current Lead for SMES)

  • 장현만;오상수;조영식;조전욱;하홍수;하동우;권영길;성기철;류강식
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2000년도 KIASC Conference 2000 / 2000년도 학술대회 논문집
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    • pp.136-138
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    • 2000
  • 1.5kA HTS current leads for a superconducting magnetic energy storage(SMES) magnet, which are connected to a conventional vapor cooled copper leads, were designed. The HTS lead composed of cylindrically arranged Bi-2223/Ag-1 at5Au tapes and a stainless steel tube. The minimum operating current of the lead is 1.71 kA at 77.3K, self magnetic field, and the heat input to the liquid helium from the clod end of the 36 cm lead is 0.5 W/lead.

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Electrical Strength of the Insulating Materials for High-Tc Superconducting Devices

  • Bae, Duck-Kweon;Kim, Chung-Hyeok;Oh, Yong-Cheul;Kim, Jin-Sa;Shin, Cheol-Gee;Song, Min-Jong;Lee, Joon-Ung
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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    • pp.149-150
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    • 2005
  • According to the trend for electric power equipment of high capacity and reduction of its size, the needs for the new high performance electric equipments become more and more important. On of the possible solution is high temperature superconducting (HTS) power application. Following the successful development of practical HTS wires, there have been renewed activities in developing superconducting power equipment. HTS equipments have to be operated in a coolant such as liquid nitrogen ($LN_2$) or cooled by conduction-cooling method such as using Gifford-McMahon (G-M) cryocooler to maintain the temperature below critical level. In this paper, the dielectric strength of unfilled epoxy and filled epoxy in $LN_2$ was analyzed. The filled epoxy composite not only compensates for this fragile property but enhances its dielectric strength.

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초전도에너지저장장치용 Cryostat 제작 및 특성시험 (Manufacturing and Tests of Cryostat for SMES)

  • 조전욱;심기덕;하홍수;김해종;성기철;권영길;류강식;고득용;류충식;김성래
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.15-18
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    • 2001
  • SMES consists of superconducting magnet, power converter and cryostat and HTS current lead. The prototype cryostat with HTS current leads and refrigerators was designed and manufactured for micro-SMES. HTS current lead with cryocooler was measured the temperature rise under dc current. The cryostat was evaluated the helium boil-off and mechanical stress during transfer and vibration test. These results will be applied to develope the micro-SMES system.

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고온 초전도 선재의 굽힘횟수와 온도차에 의한 임계전류저하특성 (Critical Current Degradation Characteristics by Temperature Difference of L$N_2$-Normal in Repetitive Bending Strain of High Temperature Superconducting Tape)

  • 김해준;김석환;송규정;김해종;배준한;조전욱;성기철
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2003년도 추계학술대회 논문집
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    • pp.274-277
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    • 2003
  • Critical current(Ic) degradation of HTS tapes after bending is one of the hottest issues in HTS development and application studies. Many people are measuring Ic degradations for effect of bending radius. However even if the bending radius is larger than the breaking radius a HTS tapes can be damaged by repetitive bending, which is unavoidable in the winding processes. Therefore, We studied the Ic degradation after repetitive bending. at 77K with self-field, of Bi-2223 tapes processed by "Powder-in-Tube" technique, which was made by America Superconductor Corporation(AMSC) and superconductiing tapes that strain is imposed measured critical current by temperature difference of L$N_2$ and normal temperature. Like this, critical current could measure that degradation about 1~3% by temperature difference. These results will amount the most important basis data in power electric machine of superconductivity cable, magnet, etc that winding work is require.

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초전도 저널베어링의 기계적 특성에 대한 연구 (Identification of Mechanical Characteristics of Superconductor proceeding Bearing)

  • 윤희중;한영희;한상철;정년호;김정훈;성태현
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.2163-2166
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    • 2004
  • For designing high Tc superconductor proceeding bearing(HTSJB) which is used on a flywheel energy storage system which requests the free of the bearing loss caused by the friction, it is necessary to understand the basic characteristics of the classical superconductor proceeding bearing because the mechanical characteristics of the HTSJB are identified by the magnetic relationships between the permanent magnet(PM) and the high Tc superconductor(HTS). In this paper, using the method, frozen image model, the force problems between the PM and the HTS were solved and then the dynamic characteristics of the rotor inside of the HTSJB can be expected in advance by using the basic characteristics between the PM and the HTS. The coefficient of friction of the HTSJB was measured in the vacuum environment. From the results, the mechanical characteristics of HTSJB can be identified using the numerical models.

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