• Title, Summary, Keyword: Electromagnetic mechanism

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Development of Heat Absorbing and High Electromagnetic Shielding Pre-Painted Steel Sheet

  • Hosokawa, Tomoaki;Ueda, Kohei;Yuasa, Kensei;Nakazawa, Makoto
    • Corrosion Science and Technology
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    • v.9 no.4
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    • pp.153-158
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    • 2010
  • Electrical appliances such as audiovisual equipment and personal computers have recently had heat and electromagnetic problems. In order to solve those problems, 'High heat absorbing pre-painted steel sheet (hereinafter referred to as PSS)', 'High electromagnetic shielding PSS' and 'High heat absorbing and high electromagnetic shielding PSS' have been developed. In this paper, the heat characteristics and electromagnetic shielding properties of PSS are investigated by methods that use enclosures and their mechanisms are discussed. It was found that 'High heat absorbing PSS' and 'High heat absorbing and high electromagnetic shielding PSS'could reduce the heat problem. The mechanism of the heat characteristics was presumed for the high heat absorptivity of the back coating inside the enclosure. And it was also found that 'High electromagnetic shielding PSS' and 'High heat absorbing and high electromagnetic shielding PSS' could shield electromagnetic waves well. The mechanism of the electromagnetic shielding properties was considered for the low transfer impedance of the back coating inside the enclosure. 'High heat absorbing PSS' and 'High electromagnetic shielding PSS' have been adopted as materials for electrical appliances and 'High electromagnetic shielding and high heat absorbing PSS' have been tested for that purpose.

Design of Electromagnetic Actuator with Three-Link Mechanism for Air Circuit Breaker (기중 차단기용 전자석 조작기 및 3절 링크 설계)

  • Kim, Rae-Eun;Kwak, Sang-Yeop;Jung, Hyun-Kyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.7
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    • pp.1321-1328
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    • 2009
  • In this paper, an electromagnetic force driving actuator (EMFA) and three-link mechanism are proposed as a driving mechanism and connection device for low voltage air circuit breaker (ACB). As the result of dynamic characteristic analysis, the actuator and link mechanism are designed from the simulation and manufactured. The magneitc field of the EMFA is analyzed using the finite element method (FEM). The dynamic characteristic analysis with calculation of the circuit equation and kinetical equation is performed by the time difference method (TDM). Also, the result of the analysis is verified through the experiment of the fabrication model. In this paper, the EMFA size is smaller than the actuator for high voltage circuit breaker. Thus, the dynamic characteristic is analyzed with end-winding inductance that is calculated by the same method which is applied on the circle type end-winding of motors. The designed model for 1600 ampere-frame ACB and the three-link mechanism for connecting contact part with actuating part are manufactured. It is confirmed that the three-link mechanism is possible for improving the circuit breaker efficiency and reducing the size of the EMFA. It is proved that the improved 2-D analysis is more accurate than established method.

Mechanism to shield the electromagnetic wave interference in the carbon coils composites

  • Kang, Gi-Hwan;Kim, Sung-Hoon;Kim, Saehyun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • pp.275-276
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    • 2014
  • The electromagnetic wave shielding properties of the carbon coils with polyurethane composites were investigated in the frequency range of 0.25 ~ 1.5 GHz. The shielding effectiveness of the composite having the various-shaped carbon coils were measured and discussed according to the weight percent of the carbon coils in the composites with the thickness of the composites layers. We confirmed that the absorption was the main mechanism to shield the electromagnetic wave interference in the carbon coils composites.

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A Study of Electromagnetic Actuator for Electro-pneumatic Driven Ventricular Assist Device

  • Jung Min Woo;Hwang Chang Mo;Jeong Gi Seok;Kang Jung Soo;Ahn Chi Bum;Kim Kyung Hyun;Lee Jung Joo;Park Yong Doo;Sun Kyung
    • Journal of Biomedical Engineering Research
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    • v.26 no.6
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    • pp.393-398
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    • 2005
  • An electromechanical type is the most useful mechanism in the various pumping mechanisms. It, however, requires a movement converting system including a ball screw, a helical cam, or a solenoid-beam spring, which makes the device complex and may lessen reliability. Thus, the authors have hypothesized that an electromagnetic actuator mechanism can eliminate the movement converting system and that thereby enhance the mechanical reliability and operative simplicity of an electro­pneumatic pump. The purpose of this study was to show a novel application of electromagnetic actuator mechanism in pulsatile pump and to provide preliminary data for further evaluations. The electromagnetic actuator consists of stators with a single winding excitation coil and movers with a high energy density neodymium-iron-boron permanent magnet. A 0.5mm diameter wire was used for the excitation coil, and 1000 turns were wound onto the stators core with parallel. A prototype of extracorporeal electro-pneumatic pump was constructed, and the pump performance tests were performed using a mock system to evaluate the efficiency of the electromagnetic actuator mechanism. When forward and backward electric currents were supplied to the excitation coil, the mover effectively moved back and forth. The nominal stroke length of the actuator was 10mm. The actuator dimension was 120mm in diameter and 65mm in height with a mass of 1.4kg. The prototype pump unit was 150mm in diameter, 150mm in thickness and 4.5kg in weight. The maximum force output was 70N at input current of 4.5A and the maximum pump rate was 150 beats per minute. The maximum output was 2.0 L/minute at a rate of 80bpm when the afterload was 100mmHg. The electromagnetic actuator mechanism was successfully applied to construct the prototype of extracorporeal electro­pneumatic pump. The authors provide the above results as a preliminary data for further studies.

Experimental Analysis of the Shielding Mechanism of Stainless Steel Woven Fabrics (Stainless Steel 직물에 대한 전자파 차폐기구의 실험적 해석)

  • Huh You;Kim Ihn Seok;Paik Yeong Nam
    • Textile Science and Engineering
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    • v.42 no.1
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    • pp.54-59
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    • 2005
  • Wide use of electrical and electronic devices in everyday life give rise to a dispute about the harmfulness of electromagnetic radiation on human body. Electromagnetic radiation also causes malfunctions of devices and interference of the signals transferred from one instrument to another. Therefore, electromagnetic shielding becomes a more important topic as more electronic devices and house hold apparatuses are supplied and used for enhancing the convenience of human life. This study attempts to show the experimental results on the electromagnetic shielding effectiveness of woven fabrics made of stainless steel fibers. We designed and constructed a measuring system, consisting of a network analyzer and a device that plays the serves as a sample holder and at the same time as a transmission medium of the incident electromagnetic wave. Experimental results show that the metal fabrics have a very good electromagnetic shielding effectiveness. The shielding effectiveness results from the reflection loss rather than the absorption loss, even though the material itself has a good absorption property. Thus, the shielding mechanism of metal woven fabrics is more influenced by structural parameters than by the electronic properties of the fiber material.

Design of Small CRPA Arrays with Circular Microstrip Loops for Electromagnetically Coupled Feed

  • Hur, Jun;Byun, Gangil;Choo, Hosung
    • Journal of electromagnetic engineering and science
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    • v.18 no.2
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    • pp.129-135
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    • 2018
  • This paper proposes a design of small controlled reception pattern antenna (CRPA) arrays using circular microstrip loops with frequency-insensitive characteristics. The proposed array consists of seven identical upper and lower circular loops that are electromagnetically coupled, which results in a frequency-insensitive behavior. To demonstrate the feasibility of the proposed feeding mechanism, the proposed array is fabricated, and its antenna characteristics are measured in a full-anechoic chamber. The operating principle of the proposed feeding mechanism is then interpreted using an equivalent circuit model, and the effectiveness of the circular loop shape is demonstrated by calculating near electromagnetic fields in proximity to the radiator. The results confirm that the proposed feeding mechanism is suitable to have frequency-insensitive behavior and induces strong electric and magnetic field strengths for higher radiation gain in extremely small antenna arrays.

Simulation of the Operation of the Control Element Drive Mechanism (제어봉구동장치의 동작 시뮬레이션)

  • Kim, Hyun-Min;Kim, In-Yong;Kim, Il-Kon
    • Proceedings of the KSME Conference
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    • pp.468-473
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    • 2004
  • The magnetic jack type Control Element Drive Mechanism (CEDM) had been developed and verified through electromechanical testing including the testing of the magnetic force required to lift the control element assembly. It would become inefficient in view of cost and time for parametric studies to be performed by test to improve the CEDM system. So it becomes necessary to develop a computational model to simulate the electromagnetic characteristics of the CEDM in order to improve the CEDM design efficiently. In this paper it is presented that the electromagnetic analysis using a 2D axisymmetric FEM model has been carried out to simulate the operation of the latch magnet of the CEDM to generate a current trace for latch coil. The results show the calculated current trace is very similar to the real current trace taken from the CEDM.

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Prediction of Electromagnetic Repulsion Force and Temperature Rise in Electric Contact Mechanism Using ANSYS (ANSYS를 이용한 전기 접촉 기구의 전자 반발력 분석 및 온도 상승 예측)

  • Park W.J.;Kim K.H.;Ahn K.Y.;Oh I.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.666-669
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    • 2005
  • As computer power increased, the system with complex phenomenon has been analyzed with the help of CAE software which can handle the coupled physics, such as electromagnetic, structure, thermal and fluid physics. To predict the electromagnetic repulsion force and the temperature distribution of an air circuit breaker with electric contact mechanism, ANSYS/EMAG, FLOTRAN can be used. Although some assumptions and simplifications were introduced to simulate the model, results from the computational model were in good agreement with actual measurements obtained from experiments.

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EMC Design of Communication System on the basis of EMC Design Rule (EMC Design Rule을 이용한 통신 System의 EMC Design)

  • 박학병;박종성;이승한;강석한;박현길
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.272-276
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    • 2000
  • 본 논문에서는 I/O Cable을 가지는 일반 통신시스템의 전자파 방사 Mechanism을 분석하고, Design에 있어 중요한 Parameter를 도출하였다. 중요한 Design Parameter로 도출된 I/0 Cable의 Coupling mechanism을 실험 및 상용 Software를 이용한 Simulation방법에 의해 분석하고, 이에 대한 EMC Design Rule을 제시하였다. 도출된 EMC Design Rule을 준수하여 Design을 실현하고, 그 효과를 분석하였다. EMC Design Rule에 기반을 둔 개발을 통해 제품의 Redesign및 복잡한 Debug 과정이 없이 효과적으로 전자파 양립성 규격을 만족하였다.

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