• 제목/요약/키워드: 3-D FEM

검색결과 929건 처리시간 0.047초

전력 검출 기능을 포함하는 LTCC 프런트 엔드 모듈 설계 (Design of a LTCC Front End Module with Power Detecting Function)

  • 황문수;구재진;구자경;임종식;안달;양규열;김준철;김동수;박웅희
    • 한국전자파학회논문지
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    • 제19권8호
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    • pp.844-853
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    • 2008
  • 본 논문에서는 전력 검출 기능을 포함하는 이동 통신 단말기용 프런트 앤드 모듈(FEM) 설계에 관하여 기술한다. 설계된 FEM은 전력 증폭기 MMIC 칩, SAW 송신 여파기 및 듀플렉서, 다이오드 전력 검출 회로, 스트립선로 구조의 정합 회로로 구성되며, 소형화를 위하여 LTCC 기술로 제작된다. 설계 주파수 대역은 CDMA 단말기 상향 송신 대역인 $824{\sim}849$ MHz이며, 최종 설계된 FEM의 크기는 전력 검출 회로까지 포함했음에도 불구하고 $7.0{\times}5.5{\times}1.5\;mm^3$로 초소형이다. 각각의 개별 구성 요소가 모두 개발되어 측정이 완료되었으며, 이를 토대로 FEM 설계가 완성된다. 측정된 성능을 보면, 송신 대역에서의 출력 전력과 이득이 각각 27 dBm과 27 dB 이상이며, ACPR 특성은 885 kHz와 1.98 MHz의 offset에서 각각 -46.59 dBc, -57 dBc 이하의 우수한 값을 갖는다.

Comparison of Biot-Savart's Law and 3D FEM in the Study of Electromagnetic Forces Acting on End Winding

  • Kim, Ki-Chan
    • Journal of Electrical Engineering and Technology
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    • 제6권3호
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    • pp.369-374
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    • 2011
  • An induction motor operated with high voltage source generally generates high current in starting mode and has a long transient time after being started. This large and sustaining starting current causes the end windings of the stator to have excessive electromagnetic force. This force is the source of vibration and has a negative and serious influence on the insulation of end windings. Therefore, designing the end winding part with an appropriate support system is needed. To design the support ring enclosing the end windings, we analyze the distribution of electromagnetic force on the end windings by applying the Biot-Savart's law and the 3D finite element method (FEM), and comparing two simulation methods. Finally, we verify the safety of the support structure of the end winding part using stress analysis, which is analyzed with the electromagnetic forces from the 3D FEM simulation.

설계민감도해석과 FEM에 의한 전자소자의 형상최적화 (Design Sensitivity Analysis for Shape Optimization of Electromagnetic Device with Finite Element Method)

  • 류재섭;고창섭
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 B
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    • pp.835-837
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    • 2002
  • This paper presents a shape optimization algorithm of electromagnetic devices using the design sensitivity analysis with FEM. The design sensitivity and adjoint variable formulas are derived for the 3D FEM with edge element. This algorithm is applied to 3D electro-magnet pole shape optimization problem to make a uniform flux density at the target region.

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조적식 교각의 내진해석 기법 개발 (Development of Seismic Analysis Technique for Masonry Structure)

  • 정용철;배준현;이준석;강영종
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2002년도 춘계학술대회 논문집
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    • pp.171-176
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    • 2002
  • There are many railway structures which were designed without conidering aseismic capacity. In special, masonry structures constructed long time ago should be reviewed about their resistance to earthquake. In this paper, technique to evaluate the capacity of masonry railway bridge is tried to develop by means of FEM analysis. In general FEM analysis program, 3-D solid element is used for masonry structures and response spectrum analysis procedure is tried. In addition, 3-D solid element has material properties equivalent to mortar-brick composite body. Used FEM program is ABAQUS-CAE.

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3 차원 FEM 을 이용한 CB100의 압연공정 및 롤 응력 해석 (Rolling Process and Roll Stress Analysis of CB100 using by 3D FEM)

  • 김정민;박춘수;우기만
    • 소성∙가공
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    • 제19권2호
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    • pp.101-106
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    • 2010
  • CB100 is one of the channel type products in the steel beam. In this study, rolling process of CB100 is analyzed by 3D FEM simulation and rolling process. FEM simulation result is compared with rolling process data. Also the intermediate & finishing roll stress analysis is carried out and the suitability of the roll through roll stress resultant analysis is evaluated. In order to decrease the roll stress, new pass schedule is developed for stable load balance between intermediate and finishing rolling stand. Therefore new rolling pass schedule is verified by the analysis results of rolling process and roll stress. By the analysis results, the credibility of rolling process analysis was obtained and it was determined that the possibility of roll damage between intermediate and finishing mill was high. So the new pass schedule was developed. Through the result of rolling process and roll stress analysis, it was obtained that the reduction of roll stress and stable load balance.

FEM과 BEM을 사용한 소리굽쇠 분석 (Tuning Fork Analysis using FEM and BEM)

  • Jarng, Soon-Suck;Lee, Je-Hyeong;Park, Yeun-Young
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 추계학술대회논문초록집
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    • pp.401.2-401
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    • 2002
  • An unconstrained tuning fork with a 3-D model has been numerically analyzed by Finite Element Method (FEM) and Boundary Element Method (BEM). The first three natural frequencies were calculated by the FEM modal analysis. Then the change of the modal frequencies was examined with the variation of the tuning fork length and width. (omitted)

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다구찌 기법과 3D FEM해석을 이용한 Magnetic position sensor의 고조파 저감에 대한 연구 (A Study Using the Taguchi Method and 3D FEM Analysis of Magnetic Position Sensor for harmonic reduction)

  • 김민규;성기용;황수진;류동석;황점굉;김원규;김윤현;김기찬
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.904-905
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    • 2011
  • 본 논문에서는 기존의 EPS(Electric Power Steering) 시스템에 IPMSM을 적용하고 속도 및 위치를 검출하기 위하여 Magnetic Position Sensor를 사용하였다. 이�� Magnetic Position Sensor의 신호는 정현파의 출력을 갖지만 고조파의 성분으로 인하여서 파형이 왜곡되고 이러한 파형의 왜곡으로 인해 위치 검출의 오차를 갖게 된다. 본 논문에서는 이러한 오차를 줄이기 위하여 다구찌 기법과 3차원 유한요소법(3D FEM)을 사용하여 고조파를 저감시킬 수 있도록 여러 변수를 변화하여서 최적의 설계를 통하여 실제 실제 센서 출력과 비교하여 자동차 산업 전반에 기여 하고자 한다.

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자기벡터포텐셜을 이용한 3차원 전자력 계산 (Electromagnetic Force Calculation using Magnetic Vector Potentials in 3-D Problems)

  • 양재진;이복용;이병환;이기식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1994년도 하계학술대회 논문집 A
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    • pp.153-155
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    • 1994
  • Electric machines such as motors which have moving parts are desgined for producing mechanical force or torque. The accurate calculation of electromagnetic force and torque is important in the design these machines, Electromagnetic force calculation method using the results of Finite Element Method(FEM) has been presented variously in 2-D problems. Typically the Maxwell's Stress Tensor method and the method of virtual work are used. In the problems including current source, magnetic vector potentials(MVP) have mostly been used as an unknown variables for field analysis by numerical method; e, g. FEM. This paper, thus, introduces both methods using MVP in 3-D case. To verify the usefulness of presented methods, a solenoid model is chosen and analyzed by 3-D and axisymmetrical FEM. In each case, the calculated force are tabulated for several mesh schemes.

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축방향 공극 구조의 정자계형 wobble 모터의 3D 유한요소 해석 (3D FEM of Electromagnetic Wobble Motor with Axial Air-Gap Type)

  • 우성봉;이은웅;김성종;최재영;김준호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 추계학술대회 논문집 학회본부 B
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    • pp.238-240
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    • 2000
  • We designed the prototype of electromagnetic wobble motor which could be applied to ultrasonic catheter in the before study. So, In this paper we perform 3D FEM of the designed prototype model with the computer analysis tool(Magnet 6.4). Therefore we prove the characteristics and theorems of the wobble motor with 3D FEM.

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3D FEM해석을 통한 배선용 차단기의 전자반발력 해석 (Magnetic Repulsion Forces in MCCB by 3-D FEM Analysis)

  • 송중천;유만종;김용기
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 B
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    • pp.711-713
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    • 2001
  • MCCB(Molded Case Circuit Breakers) is a multi-function safety device which, unlike other forms of protection, combines many protection features in a single unit. This paper is the analysis of magnetic repulsion forces with the breaking current 11.28kA, 22.5kA, 38.9kA and 45kA.

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