• Title/Summary/Keyword: Electromagnetic Finite Element Analysis

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Design Models for Electric Coupling Probe in Combline Resonators Using Neural Network (신경망을 이용한 Combline 공진기 내의 전계결합 프로브 설계 모델)

  • 김병욱;김영수
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2002.11a
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    • pp.366-369
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    • 2002
  • Two artificial neural networks (ANN) are used to model the electric coupling probe in the combline resonators. One is used to analyze and synthesize the electric probe, and the other is used to correct errors between the results of the analysis and the synthesis ANNs and the fabrication results. The ANNs for the analysis and the synthesis of the electric probe are trained using the physical dimensions of the electric probe and the corresponding coupling bandwidth which is obtained using the finite element method. The ANNs for the error correction are trained using a very small set of the measurement results. Once trained, the ANN models provide the correct result approaching the accuracy of the measurement. The results from the ANN models show fairly good agreement with those of the measurement and they can be used as good initial design values.

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Analytical and Experimental Study for Electromagnetic Performances of a Tubular Linear Machine with Axially Magnetized Single-sided Permanent Magnets

  • Shin, Kyung-Hun;Jeong, Kyoung-Hun;Choi, Jang-Young;Hong, Keyyong;Kim, Kyong-Hwan
    • Journal of Magnetics
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    • v.20 no.4
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    • pp.432-438
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    • 2015
  • This paper presents an electromagnetic analysis of a tubular linear machine with axially magnetized permanent magnets using improved analytical techniques. Based on the magnetic vector potential and a two-dimensional polar-coordinate system, the magnetic field and armature reaction field can be derived. Using these, equivalent circuit parameters, such as the electromotive force and inductance, can be obtained analytically. Finally, the generating characteristics are derived with the equivalent circuit method. In this study, the finite element method was employed to provide a comparative evaluation, and experiments were conducted to validate the results of the analytical analysis.

Design and Performance Analysis of Coreless Axial-Flux Permanent-Magnet Generator for Small Wind Turbines

  • Chung, Dae-Won;You, Yong-Min
    • Journal of Magnetics
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    • v.19 no.3
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    • pp.273-281
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    • 2014
  • This paper presents an innovative design for a low-speed, direct-drive, axial-flux permanent-magnet (AFPM) generator with a coreless stator and rotor that is intended for application to small wind turbine power generation systems. The performance of the generator is evaluated and optimized by means of comprehensive 3D electromagnetic finite element analysis. The main focus of this study is to improve the power output and efficiency of wind power generation by investigating the electromagnetic and structural features of a coreless AFPM generator. The design is validated by comparing the performance achieved with a prototype. The results of our comparison demonstrate that the proposed generator has a number of advantages such as a simpler structure, higher efficiency over a wide range of operating speeds, higher energy yield, lighter weight and better power utilization than conventional machines. It would be possible to manufacture low-cost, axial-flux permanent-magnet generators by further developing the proposed design.

Crosstalk Analysis of the Spiral Inductor in LTCC (다층 구조를 갖는 LTCC기술에서 나선형 인덕터로 인한 혼신 해석)

  • Kim, Seong-Nam;Kim, Gyung-Chul;Cho, Hyun-Min;Hwang, Chi-Jeon;Yang, Hyung-Kook;Lee, Hai-Young
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.260-264
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    • 2003
  • It is possible to design the high performance, integration and low cost radio frequency components by using LTCC(Low Temperature Cofired Ceramic) technology. But there is a critical point to design the spiral inductor because of crosstalk effects. of the crosstalk effect of the spiral inductor are investigated using full-wave analysis of the FEM(Finite Element Method) in this paper. The results show that input power of the spiral inductor are coupled from 0.1% to 10% above 3GHz. Therefore, we should consider the crosstalk effects when we design the LTCC.

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Analysis of a Suspended Stripline using FDTD Method and Design of Suspended Stripline Filter (유한차분 시간영역법을 이용한 Suspended Stripline 해석 및 필터 설계)

  • 남윤권;박동철
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.6
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    • pp.605-611
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    • 2002
  • A simple and efficient analysis method of the suspended stripline using the finite-difference time-domain (FDTD) method is presented. New FDTD equations are derived using the contour path FDTD concept for the Yee cell which contains a dielectric sheet. The characteristic impedance and the effective dielectric constant of the suspended stripline are calculated using our proposed FDTD method. Using the calculated results, a 5-element lowpass filter is designed and fabricated. Our proposed FDTD method is validated by the measured data of the fabricated lowpass filter.

Analysis and Understanding of Eddy Current Problem using electromagnetic field Packeg (전자장 해석 프로그램을 이용한 와전류 문제의 해석 및 이해)

  • Lim, Keon-Gyu;Lee, Hyang-Beom
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.1237-1238
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    • 2006
  • When the coil with alternating current approaches to the conductor the eddy current flows in conductor. Eddy current is concentrated on the conductor surface and decrescent because of skin effet.. In this paper investigated eddy current characteristic that is happened in conductor. Analyzed characteristic using electromagnetic field finite element analysis program that is commercialized to analyze value of eddy current and penetration depth. Analyzed creation value of eddy current and penetration depth in conductor that change operation frequency and the material of conductor, coil outside diameter, inside diameter, position, type of conductor from analyzed eddy current characteristic. The results. using distribution of eddy current and penetration depth data is that will help to forecast ECT(Eddy Current Testing), Eddy current application and use field, eddy current loss.

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Analysis and Improvement of Shielding Effect of Electromagnetic Field in Extremely Low Frequency System (극저주파 시스템에서 전자장 차폐효과 해석 및 개선 방안)

  • Kim, Sang-Hon;Choi, Hong-Soon;Park, Il-Han
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.978-979
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    • 2006
  • Recently, Peoples are exposed the ELF(Extremely Low Frequency) magnetic fields in the vicinity of underground transmission lines, and there are the generally accepted opinion that the magnetic fields affect the human body and there are possibility of the disease. Also in relation to this problem, technical solution methods and research are advanced for reducing the magnetic fields. In this paper, to practically understand the magnetic fields underground transmission lines, We analyze the electromagnetic field distribution in the underground transmission lines by means of FEM(Finite Element Methods) and present that improvement of the effective shielding methods by applying cable arrangements and shielding materials, eddy current problem to the underground transmission lines by means of the numerical analysis Tool.

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A Study on the Numerical Analysis of Electromagnetic Field using Multi-Grid Method. (다층요소강법을 이용한 전자력 수직해석에 관한 연구)

  • Koh, Chang-Sub;Choi, Kyung;Lee, Ki-Sik;Hahn, Song-Yop
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.5
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    • pp.282-288
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    • 1988
  • A Multi-grid method is introduced to Finite Element Analysis of electromagnetic field problems in order to reduce the computational time. The puropse of this work is to study how to intermix discretization and solving process, thereby making the process more effective and to find the optimal factors of Multi-grid method. Several numerical experiments with linear models of uniform and nonuniform grids confirm that the proposed algorithm can reduce the computational time very effectively as compared with con ventional iterative methods. The best results are obtained with V cycle and S.O.R. with the acce leration factor of 1.3-1.4 for smoothing.

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Electromagnetic and Thermal Analysis of Squirrel Gage Canned Induction Motor for SMART Main Coolant Pump (SMART용 냉각재순환펌프에 장착되는 농형유도전동기의 전자기 및 열해석)

  • Huh, Hyung;Koo, Dae-Hyun;Kang, Do-Hyun
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.308-311
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    • 1999
  • A squirrel cage canned induction motor for the main coolant pump of the integral reactor, SMART was designed, manufactured and tested. The motor was first designed using the equivalent circuit theory to determine major dimensions and then finalized through finite element analyses for electromagnetic and thermal characteristics. In order to verify the design methodology, a reduced scale canned induction motor was manufactured and tested. The experimental results have shown a good agreement with the analysis results.

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Analysis and Understanding of Eddy Current Problem using electromagnetic field Packeg (전자장 해석 프로그램을 이용한 와전류 문제의 해석 및 이해)

  • Lim, Keon-Gyu;Lee, Hyang-Beom
    • Proceedings of the KIEE Conference
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    • 2006.07c
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    • pp.1697-1698
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    • 2006
  • When the coil with alternating current approaches to the conductor the eddy current flows in conductor. Eddy current is concentrated on the conductor surface and decrescent because of skin effect. In this paper investigated eddy current characteristic that is happened in conductor. Analyzed characteristic using electromagnetic field finite element analysis program that is commercialized to analyze value of eddy current and penetration depth. Analyzed creation value of eddy current and penetration depth in conductor that change operation frequency and the material of conductor, coil outside diameter, inside diameter, position, type of conductor from analyzed eddy current characteristic. The results, using distribution of eddy current and penetration depth data is that will help to forecast ECT(Eddy Current Testing), Eddy current application and use field, eddy current loss.

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