• Title/Summary/Keyword: Optimized Iron Core

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Optimization of Iron Core Structure for Controlling Induced Electric Field Distribution Using the Continuum Design Sensitivity Analysis (CDSA) (설계 민감도법을 이용한 유도 전기장 분포 제어를 위한 철심구조 최적화 연구)

  • Park Joon-Goo
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.55 no.8
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    • pp.397-400
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    • 2006
  • An optimized iron core structure of stimulating coil are presented in order to control the induced electric field distribution using the Continuum Design Sensitivity Analysis (CDSA) combined with a commercially available generalized finite element code (OPERA). The results show that a Figure-Of-Eight (FOE) coil as well as a circular coil with the proposed iron core structure can increase induced electric field intensity by more than two times and make better field localization, compared with those of existing stimulation coil with a air core. After considering manufacturing constraints, a practical iron core structure based on the proposed optimized one is proposed and its performance is analyzed.

Design of Neodymium Permanent Magnetic Core using FEM (유한요소법을 이용한 네오디움 영구자석의 코어 설계)

  • Hur, Kwan-Do;Ye, Sang-Don
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.5
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    • pp.70-75
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    • 2014
  • Permanent magnets have recently been considered as device that can be used to control the behavior of mechanical systems. Neodymium magnets, a type of permanent magnet, have been used in numerous mechanical devices. These are permanent magnets made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. The magnetic selection, magnet core design and mechanical errors of the magnetic component can affect the performance of the magnetic force. In this study, the coercive force, residual induction, and the dimensions of the design parameters of the magnet core are optimized. The design parameters of magnet core are defined as the gap between the magnet and the core, the upper contact radius, and the lower thickness of the core. The force exercised on a permanent magnet in a non-uniform field is dependent on the magnetization orientation of the magnet. Non-uniformity of the polarization direction of the magnetic has been assumed to be caused by the angular error in the polarization direction. The variation in the magnetic performance is considered according to the center distance, the tilt of the magnetic components, and the polarization direction. The finite element method is used to analyze the magnetic force of an optimized cylindrical magnet.

Aging Test of 20kVA Amorphous Core Transformer by Loading Back Method (부하반환법에 의한 20KVA 비정질 변압기의 경년열화 연구)

  • 민복기;송재성;정영호;임정재
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.2
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    • pp.278-285
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    • 1994
  • Aging test was done by loading back method for 20kVA amorphous core transformers manufactured by Hyosung Industries Co. and korea Electric Power Corporation. Iron losses, copper losses and insulation oil temperatures of the transfromers was measured for all the testing period. Expected life of amorphous core transformers on the basis of the degradation of the insulators was 46 years at 100% load, and 2.4 years at 130% load. Average temperature rising of transformer oil of amorphous core transformers was higher than that of silicon steel core transformers. Hence lowering the oil temperature by optimized design is needed for improving the expected life of the amorphous transformers.

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Optimization of Process Variables for Insulation Coating of Conductive Particles by Response Surface Methodology (반응표면분석법을 이용한 전도성물질의 절연코팅 프로세스의 최적화)

  • Sim, Chol-Ho
    • Korean Chemical Engineering Research
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    • v.54 no.1
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    • pp.44-51
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    • 2016
  • The powder core, conventionally fabricated from iron particles coated with insulator, showed large eddy current loss under high frequency, because of small specific resistance. To overcome the eddy current loss, the increase in the specific resistance of powder cores was needed. In this study, copper oxide coating onto electrically conductive iron particles was performed using a planetary ball mill to increase the specific resistance. Coating factors were optimized by the Response surface methodology. The independent variables were the CuO mass fraction, mill revolution number, coating time, ball size, ball mass and sample mass. The response variable was the specific resistance. The optimization of six factors by the fractional factorial design indicated that CuO mass fraction, mill revolution number, and coating time were the key factors. The levels of these three factors were selected by the three-factors full factorial design and steepest ascent method. The steepest ascent method was used to approach the optimum range for maximum specific resistance. The Box-Behnken design was finally used to analyze the response surfaces of the screened factors for further optimization. The results of the Box-Behnken design showed that the CuO mass fraction and mill revolution number were the main factors affecting the efficiency of coating process. As the CuO mass fraction increased, the specific resistance increased. In contrast, the specific resistance increased with decreasing mill revolution number. The process optimization results revealed a high agreement between the experimental and the predicted data ($Adj-R^2=0.944$). The optimized CuO mass fraction, mill revolution number, and coating time were 0.4, 200 rpm, and 15 min, respectively. The measured value of the specific resistance of the coated pellet under the optimized conditions of the maximum specific resistance was $530k{\Omega}{\cdot}cm$.

Loss analysis to the various kinds of core for PCS inductor and transformer (코어 종류에 따른 PCS 인덕터와 트랜스포머 손실 분석)

  • Yang, Seung-Dae;Shim, Jae-Hwe;Choi, Ju-Yeop;Song, Seung-Ho;Choy, Ick;An, Jin-Ung;Lee, Dong-Ha
    • Journal of the Korean Solar Energy Society
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    • v.31 no.2
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    • pp.22-30
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    • 2011
  • In recently, inductor and transformer is the common device using widely in the photovoltaic system and power electronics. Therefore, each inductor and transformer has different core loss and iron loss depending on the size and kinds of core materials, it is important to analyze loss characteristics for better transformer efficiency. This paper offers an efficiency calculation method for PCS inductor and transformer loss, and different kinds of core materials are analyzed for optimized PCS design.

A Study on Optical Current Sensor and Voltage Sensor for automation of power distribution (배전자동화 개폐기 내장형 광 전류 및 광 전압 센서에 관한 연구)

  • 양승국;오상기;박해수;김인수;김요희;홍창희
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.1
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    • pp.89-98
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    • 2002
  • Optical current sensor and optical voltage sensor modules were designed and fabricated to improve measurement error and insulation in automatic power distributor By using Faraday effect, optical current sensor with an $\alpha$-iron core was designed and fabricated to minimize current induction of the other phase and was optimized to maintain linearity. Optical voltage sensor was fabricated owing to the pockets effect and adopted spatial electric field type because of small room in an automatic power distributor. To connect a distributor with an external terminal for signal processing, optical multi connector was designed, fabricated and tested for coupling loss and gas leakage. The linearity of optical current sensor for applied current maintains variation of smaller than 2.5% for applied current range from 20A to 700A. The linearity of optical voltage sensor was smaller than 1% for appling voltage from 6.6kV to 19.8kV. Since the measured characteristics are good, these devices can be considered as being applicable in practice.