• Title/Summary/Keyword: 클램프

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Analysis of an Active Clamp Forward Converter with Current-Doubler Rectifier for Wide Range Zero Voltage Switching (전류증배 정류회로를 사용한 능동 클램프 포워드 컨버터의 개선된 영전압 스위칭에 대한 분석)

  • Kim, D.H.;Jang, Paul;Cho, B.H.
    • Proceedings of the KIPE Conference
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    • 2013.11a
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    • pp.137-138
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    • 2013
  • 능동 클램프 포워드 컨버터의 2차단에 전류 증배 정류회로를 사용할 경우 2차단에서의 도통 손실을 줄일 수 있다. 뿐만 아니라 상대적으로 큰 자화 인덕턴스와 작은 누설 인덕턴스를 이용하여 영전압 스위칭을 달성할 수 있으므로 회로 전체 동작 측면에서 바람직하다. 본 논문에서는 제안된 회로의 동작 설명과 함께 영전압 스위칭을 위한 조건을 다루었고 240W급 (12-V/20-A) 프로토타입 회로를 통해 분석 결과의 타당성을 검증하였다.

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Shape Design of the U-Type Wedge of the Rail Clamp for a Container Crane (컨테이너 크레인용 레일클램프의 U형 쐐기 형상설계)

  • Han, D.S.;Han, G.J.
    • Journal of Power System Engineering
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    • v.13 no.6
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    • pp.117-122
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    • 2009
  • The wedge type rail clamp compresses the rails with small clamping force at first, and with large clamping force when the wind speed increases because of the wedge working. If the supporter is not installed in the rail clamp with V-type wedge when the wind speed increases more and more, the structure will occur overload which leads the structure to fracture. But in the clamp with U-type wedge the supporter is not necessary because the tangential angle of the wedge increases as the sliding distance increases. The proper shape of U-type wedge is determined by the initial clamping force and the tangential angle of the wedge. Accordingly we, first carry out the finite element analysis in order to analyze the relation between the sliding distance and the wedge angle. Next we suggest the proper shape of U-type wedge as analyze the relation between the radius of curvature and the sliding distance.

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A Three Phase Voltage-Fed DC-DC Converter with Active Clamping for Fuel Cell Applications (연료전지 응용을 위한 능동 클램프 방식의 전압원 3상 DC-DC 컨버터)

  • Kim, Hyung-Joon;Kim, Jeong-Geun;Yoon, Chang-Woo;Choi, Se-Wan
    • Proceedings of the KIPE Conference
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    • 2007.11a
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    • pp.24-27
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    • 2007
  • 본 논문에서는 수 kW급 이상의 연료전지 응용을 위한 고효율 전압원 3상 DC-DC 컨버터를 제안한다. 제안한 컨버터는 전압원 컨버터임에도 작은 턴비를 가지며 입 출력 전류 리플이작다. 또한 클램프 회로의 동작으로 다이오드 서지전압 제거는 물론 저전압측 순환전류를 큰폭으로 감소시켜 스위치의 도통손실과 변압기의 동손을 최소화하였고 전 부하영역에서 하측스위치의 ZVZCS를 성취하여 스위칭 손실을 최소화 하였다. 또한 유효 듀티를 증가시켜 누설인덕턴스에 의한 듀티 손실을 보상하였다. 제안하는 컨버터의 동작원리를 설명하였고 기존 컨버터와의 비교분석을 수행하였으며 시뮬레이션을 통해 본 방식의 타당성을 검증하였다.

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Design of the active clamp forward converter for high efficiency (고효율을 위한 능동 클램프 포워드 컨버터의 설계)

  • Eom, Tae-Ho;Kim, Jun-Mo;Lee, Jeong;Kim, Sung-Hun;Shin, Min-Ho;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2017.11a
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    • pp.179-180
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    • 2017
  • 본 논문은 전기자동차의 HVBAT 전력을 LVBAT에 충전하는 LDC 전원장치의 고효율 설계 방법에 대하여 설명한다. 기존의 단일형 LDC 전원장치의 배터리 모듈 불평형 문제를 직렬 분배 방식의 모듈형 LDC로 설계하여 불평형 문제를 해결할 수 있는 장점을 갖고 있다. 제안하는 LDC 전원장치는 기존 단일형 1kW이상의 용량에서 모듈형의 150W용량을 가지며 절연이 가능한 포워드 컨버터로 설계하였다. 그리고 소형화가 가능하고 적은 부품수로 설계할 수 있는 능동 클램프 방식의 포워드 컨버터로 선정하였다. 또한 부피와 무게를 최소화하면서 고효율 구현이 가능한 설계기법을 제안하고 실험을 통하여 타당성을 검증한다.

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Stress Analysis of a Clamp Chuck for Machining of a Ring Gear (링기어 절삭을 위한 클램프 척의 응력해석)

  • Sim, Han-Sub;Kim, Hae-Ji
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.3
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    • pp.73-78
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    • 2011
  • This study contains to theory and analysis research for the stress and the translation of an expand disk that fix a ring gear for tooth profile machining. The stress of the expand disk is analysed by the finite element method(FEM) to calculate design parameters. From the analysis results, the stress of the expand shows a linear tendency under various fixing force. This results show that the expand disk have a elastic characteristics as a disk spring. The maximum stress was observed on under side in split section of the expand disk. It is verified that the analysis results are useful to calculate design parameters of the expand disk.

The Design of Supporter to Prevent Overclamping in Wedge Type Rail clamp (쐐기형 레일클램프의 과클램핑 방지를 위한 지지장치 설계)

  • 한근조;안찬우;전영환;심재준;한동섭;김병진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1446-1449
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    • 2003
  • In this study we analyze operation principle of wedge type rail clamp using in the harbor and when wind force applies to container crane, we calculate deformation in each part of rail clamp. As a result of calculation, we will design rail clamp supporter that forbid overload to be applied at rail clamp according to adjust climbing wedge distance of roller. It would be adapted various container capacity and wind velocity.

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Study for weight of wedge type rail clamp according to initial clamping force (레일클램프의 원활한 클램핑과 초기체결력 발휘를 위한 중추무게의 관계에 관한 연구)

  • Han, Geun-Jo;An, Chan-Woo;Kim, Tae-Hyung;Sim, Jae-Jun;Han, Dong-Sub;Lee, Ho;Jeon, Young-Hwan
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1517-1520
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    • 2003
  • In this paper, we design a wedge type rail-clamp which can protect container crane from wind with constant clamping force regardless of the operating period. When we design wedge type rail clamp, it is important to determine the weight for locker to descent smoothly with an initial clamping force of rail and pad. Therefor, this paper suggest a process to decide a wright within proper range which could be obtained using FEA of wedge type rail clamp.

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A Numerical Model of an Edge-clamped Rectangular Plate Based on a Mode Method to Predict Acoustic Radiation Characteristics (모드법에 의한 클램프 조건 사각평판의 음향방사특성 예측모델)

  • Yoo, Ji-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.21 no.4
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    • pp.374-383
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    • 2011
  • A numerical model based on a mode method coupling beams and a rectangular plate is proposed to estimate radiation characteristics of an edge-clamped rectangular plate. The radiation efficiency and radiation power in the audio frequency range including the critical frequency can be predicted. The proposed model is rather simple and straightforward and gives reliable results comparing to the previous studies. The estimated radiation characteristics are compared to those of the pinned condition plates and also to those based on the formulae proposed by Maidanik. The radiation efficiency of the clamped plate seems a little higher than that of the pinned plate in the frequency range of corner and edge modes. It is explicitly shown that the power as well as efficiency at high frequencies is not influenced by these edge boundary conditions.

Vibration Analysis of a Stacked beam Including Frictional Contact Force (마찰 접촉력을 고려한 다발 보(Stacked Beam)의 진동 해석)

  • 이기수;임철호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.8
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    • pp.1513-1518
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    • 1992
  • Numerical solution technique is suggested to analyze the vibration of a spring composed of stacked beams fastened together. Bernoulli-Euler beam theory for small deflection is used, and incremental Coulomb friction law is adopted for the interface friction. The validity of the present solution technique is checked for the perfectly bonded case and the perfect sliding case.

Relationship between the Initial Clamping Force and the Sliding Distance of the Rail Clamp according to the Wedge Angle (쐐기각에 따른 레일클램프의 초기 압착력과 밀림거리 사이의 관계)

  • Han D.S.;Lee S.W.;Kwon S.K.;Han G.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.379-380
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    • 2006
  • In this study we dealt with the relationship between the initial clamping force and the sliding distance in the wedge type rail clamp. The sliding distance is determined by the wedge angle and the initial clamping force. In order to derive the relation formula between the wedge angle and the sliding distance, we ad opt 5-kinds of the wedge angle, such as 2, 4, 6, 8, $10^{\circ}$. And then we analyze the effect of the initial clamping force on the sliding distance.

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