• 제목/요약/키워드: Shield Design

검색결과 362건 처리시간 0.033초

공심형 초전도 동기발전기의 설계변수에 대한 연구 (An Approach to the Design Parameter of Air-Cored Superconducting Synchronous Generator)

  • 조영식;홍정표;이주;손명환;권영길;류강식
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제50권3호
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    • pp.101-106
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    • 2001
  • Air-cored superconducting synchronous generator(ASSG) is characterized by an air-cored machine with its rotor iron and stator iron teeth removed. For this reason, in the case of the shape optimum design of ASSG, other design variables different from an iron-cored machine should be considered, which will lead to substantial improvement on the performance. The major design variables that are considered by using Three-dimensional Finite element Method(3D FEM) in this paper are : 1) field coil width, 2) axial length of magnetic shield, and 3) armature winding method. End-ring of armature winding is considered in the calculation of EMF. When it comes to field coil width, as field coil width enlarges, its effective field increases but the maximum field on the superconductor decreases. this determines the critical current density. this study presents an effective field coil width, axial length of magnetic shield, and armature winding method, and also the analysis is verified by the experimental results.

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나사산 전면검사 비전시스템의 영상 균일도 향상을 위한 조명 광학계 설계 및 해석 (Design and Analysis of Illumination Optics for Image Uniformity in Omnidirectional Vision Inspection System for Screw Threads)

  • 이창훈;임영은;박근;나승우
    • 한국정밀공학회지
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    • 제31권3호
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    • pp.261-268
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    • 2014
  • Precision screws have a wide range of industrial applications such as electrical and automotive products. To produce screw threads with high precision, not only high precision manufacturing technology but also reliable measurement technology is required. Machine vision systems have been used in the automatic inspection of screw threads based on backlight illumination, which cannot detect defects on the thread surface. Recently, an omnidirectional inspection system for screw threads was developed to obtain $360^{\circ}$ images of screws, based on front light illumination. In this study, the illumination design for the omnidirectional inspection system was modified by adding a light shield to improve the image uniformity. Optical simulation for various shield designs was performed to analyze image uniformity of the obtained images. The simulation results were analyzed statistically using response surface method, from which optical performance of the omnidirectional inspection system could be optimized in terms of image quality and uniformity.

고균일 자계발생용 초전도 능동차폐 마그네트의 설계에 관한 연구 (A Design Approach for High Homogeneity Superconducting Magnet with Superconducting Active Shield)

  • 이광호;김성도;조윤현;이재복
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 A
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    • pp.151-153
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    • 1996
  • An optimal design approach is presented for high homogeneity superconducting magnet with superconducting active shield especially for use in magnetic resonance imaging system. This paper is investigated phenomena for the stray magnetic field to get a basic reduction techniques of the unwanted stray magnetic field from the magnet. The present method obtains optimal coil configuration considering constraints for magnetic field homogeneity and leakage field.

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철도 및 도로 횡단공법 시공 사례 (Cases of Excavation Methods for Crossing Railway and Road)

  • 김동준;박영호;이윤범;이은철
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2003년도 추계학술대회 논문집(II)
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    • pp.429-435
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    • 2003
  • This paper presents the case studies of Tubular Roof construction Method(T.R.c.M) and Semi Shield method, which were applied to the tunnel excavation under the pre-existing railways. It was proved that T.R.c.M was an effective and safe method for the tunnel excavated in soft soil, giving little damage to the railways located a few meters above. Semi Shield was also performed successfully to bore a tunnel in soft and hard rock, minimizing the ground settlement and tilting of vulnerable fuel tanks. Site and soil conditions are also discussed, which led these relatively new methods to success. Finally, comparison of the measurement results and the design values are made to verify and improve the current design practice.

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3상 초전도케이블의 불평형 부하운전시 열.전류 저항에 의한 운전특성연구 (A Study on the operational characteristics of Thermal.Current Resistance of 3 phase HTS Cable under Unbalanced load operation)

  • 이근준;황시돌;이현철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 제39회 하계학술대회
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    • pp.189-1-190-1
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    • 2008
  • A high temperature superconducting(HTS) power cable is available for high capacity current in normal condition. But resistance was appeared to operate unbalance load by thermal current characteristic. This characteristic of HTS power cable used to design for unstated condition. And than, It used to understand and analyze characteristic of power cable thermal and critical current. This study appeared that quench resistance reason from shield and former current rise to superconductor(SC) current. The resistance of SC occurred that the cable temperature rise to fault current after decreased critical current. The quench resistance of SC increased in temperature or decreased in critical current. So the quench resistance of SC correlated with resistance of both shield and former current. It need to sufficiently influenced the parameters of HTS cable design.

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곡률을 가진 쉴드슬롯판의 편평도 향상 연구 (A Study on the Enhancement of Flatness for the Shield Slot Plate with Curvature)

  • 우동욱;이상욱
    • 한국기계가공학회지
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    • 제5권3호
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    • pp.23-28
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    • 2006
  • The focus of this study is placed on the enhancement of flatness for the shielded slot plate, one of main components of the MCFC stack. The shielded slot plate is to get curvature during manufacturing process since it is produced by forming operation from only one side of it. Therefore, a correction die is proposed to place just after the main die to apply unbending on the curved plate to get almost flat product. In the design for the correction die, four kinds of design factors are selected to study which factor is the most influencing one affecting the flatness of the plate. From the experimental results using Taguchi method, it has been revealed that the Young's modulus of urethane die is the most critical factor.

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Coreless Hall Current Sensor for Automotive Inverters Decoupling Cross-coupled Field

  • Kim, Ho-Gi;Kang, Gu-Bae;Nam, Dong-Jin
    • Journal of Power Electronics
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    • 제9권1호
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    • pp.68-73
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    • 2009
  • Automotive inverters may require current sensors for motor torque control, especially, in applications of hybrid electric vehicles or fuel cell vehicles. In this paper, to achieve a compact, integrated and low cost current sensor, a hall current sensor without magnetic core is introduced for integrating an automotive inverter. The compactness of the current sensor is possible by using integrated magnetic concentrators based on the Hall effect. Magnetic fields caused by three-phase currents are analyzed and a magnetic shield design is proposed for decoupling the cross-coupled field. It offers galvanic isolation, wide bandwidth (>100kHz), and accuracy(< 1%). Using 2D FEM analysis, its performance is demonstrated with design parameters at a U-shaped magnetic shield. The proposed coreless current sensor is tested with rated current to validate the linearity and accuracy.

Electron Beam Simulation Technology for CRTs

  • Shirai, Shoji;Oku, Kentarou
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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    • pp.385-387
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    • 2002
  • The electron beam simulation technology is indispensable for the recent electron gun design. The technology is becoming more and more important for deflection yoke (DY) design and investigation of the interference effects between gun and DY. Further, it may become vital even for shadow mask, glass funnel, exposure lens and magnetic shield.

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