• 제목/요약/키워드: Flux2D

검색결과 852건 처리시간 0.03초

Axi-periodic Analysis를 이용한 대형 터보 발전기 단부 Flux Shield의 Eddy Current Loss 산정 (Eddy current loss calculation of flux shield in the large turbo generator using axi-periodic analysis)

  • 권순오;이정종;홍정표;남혁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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    • pp.987-989
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    • 2005
  • Axi-periodic analysis using magnetic vector potential is formulated in time harmonic field and applied to the field analysis for the end region of large turbo generator in this paper. By using axi-periodic analysis, the effect of flux shield, one of the structure placed in the end region of large turbo generator to prevent stator end from thermal damage, is studied, and eddy current loss in the flux shield is estimated for operation conditions. 3D FEA is used for the verification of presented analysis method. Because 3D flux distribution can be calculated with 2D modeling, magnetic field showing 3D distribution can be effectively calculated by axi-periodic analysis comparing with 3D FEA.

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Design of Surface-Mounted Permanent Magnet Synchronous Motor Considering Axial Leakage Flux by using 2-Dimensional Finite Element Analysis

  • Lee, Byeong-Hwa;Park, Hyung-Il;Jung, Jae-Woo
    • Journal of Electrical Engineering and Technology
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    • 제13권6호
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    • pp.2284-2291
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    • 2018
  • This paper deals with optimum design of surface mounted permanent magnet synchronous motor (SPMSM) for automotive component. For a compact system structure, it was designed as a motor with a 14-pole 12-slot concentrated winding and hollow shaft. The motor is a thin type structure which stator outer diameter is relatively large compared to its axial length and is designed to have a high magnetic saturation for increasing the torque density. Since the high magnetic saturation in the stator core increases the axial leakage flux, a 3-dimensional (3-D) finite element analysis (FEA) is indispensable for torque analysis. However, optimum designs using 3-D FEA is inefficient in terms of time and cost. Therefore, equivalent 2-D FEA which is able to consider axial leakage flux is applied to the optimization to overcome the disadvantages of 3-D FEA. The structure for cost reduction is proposed and optimum design using equivalent 2-D FEA has been performed.

ALU를 위한 단자속 양자 D2 Cell과 Inverter의 설계 (Design of Single Flux Quantum D2 Cell and Inverter for ALU)

  • 정구락;박종혁;임해용;강준희;한택상
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2003년도 학술대회 논문집
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    • pp.140-142
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    • 2003
  • We have designed a SFQ (Single Flux Quantum) D2 Cell and Inverter(NOT) for a superconducting ALU (Arithmetic Logic Unit). To optimize the circuit, we have used Julia, XIC and Lmeter for simulations and layouts. We obtained the circuit margin of larger than $\pm$25%. After layout, we drew chip for fabrication of SFQ D2 Cell and Inverter. We connected D2 Cell and Inverter to jtl, DC/SFQ, SFQ/DC and RS flip-flop for measurement.

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Comparison of Transverse Flux Rotary Machines with Different Stator Core Topologies

  • Lee, Jiyoung;Chung, Shiuk;Koo, Daehyun;Han, Choongkyu
    • Journal of Magnetics
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    • 제19권2호
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    • pp.146-150
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    • 2014
  • The objective of this paper is to provide a comparison between two transverse flux rotary machines (TFRM) with different topologies of stator cores. Depending on how to make stator core with laminated steel sheets, the one topology is 'perpendicular stacking core' and the other is 'separated core'. Both of the two cores have been designed considering 3-dimensional (3-D) magnetic flux path with the same output power conditions, but the core losses are quite different and it causes different magnetic and thermal characteristics. For comparison of these two topologies of stator cores, therefore, core losses have been calculated and used as a heat source in no-load conditions, and the thermal stress has been also calculated. 3-D finite element method has been used for the magnetic field, thermal, and stress analysis to consider the 3-D flux path of the TFRM. After comparing the analysis results of the two topologies, experimental results are also presented and discussed.

양측식 리니어 펄스 모터의 자로와 정특성 해석 (Analysis of Magnetic Flux Path and Static Thrust Force of the Double-Side Linear Pulse Motor)

  • 김성종;이은웅;김성헌;김준호
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제51권9호
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    • pp.493-498
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    • 2002
  • Double-side linear pulse motor(DSLPM) has more advantages than single-side linear pulse motor because noise and vibration can be considerably decreased by countervailing the normal forces, which is generated between two stators and mover. However, DSLPM has more complicated magnetic flux path and layout of stator pole toot/mover tooth rather than single-side linear pulse motor In this paper, DSLPM is designed and fabricated by considering the air gap magnetic density, shape of tooth and slot. In order to verify the characteristics of DSLPM, the air gap magnetic flux density is analyzed by 2D FEM and the magnetic flux path is analyzed by 3D FEM. Also the static thrust forces is obtained with the analyzed results.

A study on temporal accuracy of OpenFOAM

  • Lee, Sang Bong
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제9권4호
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    • pp.429-438
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    • 2017
  • Cranke-Nicolson scheme in native OpenFOAM source libraries was not able to provide 2nd order temporal accuracy of velocity and pressure since the volume flux of convective nonlinear terms was 1st accurate in time. In the present study the simplest way of getting the volume flux with 2nd order accuracy was proposed by using old fluxes. A possible numerical instability originated from an explicit estimation of volume fluxes could be handled by introducing a weighting factor which was determined by observing the ratio of the finally corrected volume flux to the intermediate volume flux at the previous step. The new calculation of volume fluxes was able to provide temporally accurate velocity and pressure with 2nd order. The improvement of temporal accuracy was validated by performing numerical simulations of 2D Taylor-Green vortex of which an exact solution was known and 2D vortex shedding from a circular cylinder.

릴럭턴스형 횡자속 선형전동기의 특성해석 (Characteristics Analysis of Reluctance Type Transverse Flux Linear Motor)

  • 류호길;이지영;하경호;홍정표;강도현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.729-731
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    • 2002
  • This paper deals with 2D and 3D analyses by finite element method for the characteristics of reluctance type transverse flux linear motor. Although 3D analysis is essential because of the characteristics by flux direction. 2D analyses are also used by considering the effective axial length and using the equivalent reluctance 2D model. The thrust, the normal force and the coenergy of the machine are calculated and compared by the results of the three analysis methods.

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S-D간격 변화에 따른 광양자의 경로와 생체조직의 계층성에 대한 실험적 연구 (An Experimental Study for the Relationship of Photon Flux Path ann Layered Properties of Biological Tissue with S- D Separation)

  • 고한우
    • 대한의용생체공학회:의공학회지
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    • 제15권1호
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    • pp.35-40
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    • 1994
  • 생체조직의 계층성과 광양자속의 경로간의 관계를 연구하기 위하여 어레이형의 프로부를 설계하였다. S-D간격이 변함에 따라서 광원의 파장이 다르면 광은 서로 다른 경로를 가지며, 최대 리플렉턴스의 위치도 달랐다. 설계된 프로브로 측정된 최대 리플렉턴스시의 S-D간격은 7.5mm, 청색은 2.5mm 이었으며 광이 조직내를 투과 및 반사될 때 조직에 따라 주 경로가 있으며, S-D 간격을 변화시키면서 리플렉턴스를 측정하므로서 조직의 계층성을 평가할 수 있었다.

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THE ELECTROMAGNETIC PROPERTIES OF Mg-Mn FERRITES

  • Lee, D.Y.;Cho, S.I.;Shon, H.J.;Hur, W.D.
    • 한국자기학회지
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    • 제5권5호
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    • pp.552-555
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    • 1995
  • The magnetic properties of Mg-Mn ferrites were investigated in the composition range of $Mg_{a}Mn_{b}Fe_{c}O_{4\pm\delta}$ (a+b+c=3) with the addition of $Al_{2}O_{3}$. In $MgO-MnO-Fe_{2}O_{3}$ ternary system, the spinel single phase existed within the composition range of MgO-50 mol%, MnO-70 mol% and $Fe_{2}O_{3}-60\;mol%$. The saturation magnetic flux density increased with the increase of $Fe_{2}O_{3}$ content and showed the maximum at the stoichiometric composition of $(Mg,Mn)Fe_{2}O_{4}$. In $Mg_{x}Mn_{1-x}Fe_{2}O_{4}(x=0.2~0.8)$ system, the saturation magnetic flux density showed the maximum at $Mg_{0.2}Mn_{0.8}Fe_{2}O_{4}$. The addition of $Al_{2}O_{3}$ resulted in the decrease of saturation magnetic flux density but increased the electrical resistivity.

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DC-link 전압변동을 고려한 PMSM 토크제어의 성능 향상 방법 (A Performance Improvement Method of PMSM Torque Control Considering DC-link Voltage Variation)

  • 이정효;원충연
    • 조명전기설비학회논문지
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    • 제28권11호
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    • pp.112-122
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    • 2014
  • 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.