• Title/Summary/Keyword: Electromagnetic Topology

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Topology Optimization of Electromagnetic Systems with Nonlinear and Eddy Current Effects (비선형 및 Eddy Current효과를 고려한 전자기 시스템의 위상 최적 설계)

  • Kang, Je-Nam;Wang, Se-Myung
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.768-770
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    • 2001
  • The topology optimizations of electromagnetic systems with the nonlinear and the eddy current effects are studied using the finite element method. The topology design sensitivity formulations of nonlinear magnetostatics and eddy current systems are derived using the adjoint variable method. A computer program is developed using object orient programming and applied to the topology optimization of a C-core actuator. A numerical study shows the effects of saturation and eddy current by comparing results of topology optimizations.

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Investigation of a Method for RF Circuits Analysis Based on Electromagnetic Topology

  • Park, Yoon-Mi;Chung, Young-Seek;Cheon, Chang-Yul;Jung, Hyun-Kyo
    • Journal of Electrical Engineering and Technology
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    • v.4 no.3
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    • pp.396-400
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    • 2009
  • In this paper, electromagnetic topology (EMT) was used to analyze the electromagnetic compatibility (EMC) of RF circuits including passive and active components. It is difficult to obtain usable results for problems relating to electromagnetic coupling in complex systems when using conventional numerical or experimental methods. Thus it is necessary to find a new methodology for analyzing EMC problems in complicated electromagnetic environments. In order to consider the nonlinear characteristics of active components, a SPICE diode model was used. A power detector circuit and the receiver circuit of a radio control (RC) car were analyzed and experimented in order to verify the validity of this method.

Reduction of Electromagnetic Field from Wireless Power Transfer Using a Series-Parallel Resonance Circuit Topology

  • Kim, Jong-Hoon;Kim, Hong-Seok;Kim, In-Myoung;Kim, Young-Il;Ahn, Seung-Young;Kim, Ji-Seong;Kim, Joung-Ho
    • Journal of electromagnetic engineering and science
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    • v.11 no.3
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    • pp.166-173
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    • 2011
  • In this paper, we implemented and analyzed a wireless power transfer (WPT) system with a CSPR topology. CSPR refers to constant current source, series resonance circuit topology of a transmitting coil, parallel resonance circuit topology of a receiving coil, and pure resistive loading. The transmitting coil is coupled by a magnetic field to the receiving coil without wire. Although the electromotive force (emf) is small (about 4.5V), the voltage on load resistor is 148V, because a parallel resonance scheme was adopted for the receiving coil. The implemented WPT system is designed to be able to transfer up to 1 kW power and can operate a LED TV. Before the implementation, the EMF reduction mechanism based on the use of ferrite and a metal shield box was confirmed by an EM simulation and we found that the EMF can be suppressed dramatically by using this shield. The operating frequency of the implemented WPT system is 30.7kHz and the air gap between two coils is 150mm. The power transferred to the load resistor is 147W and the real power transfer efficiency is 66.4 %.

Topology Design Optimization of Electromagnetic Vibration Energy Harvester to Maximize Output Power

  • Lee, Jaewook;Yoon, Sang Won
    • Journal of Magnetics
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    • v.18 no.3
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    • pp.283-288
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    • 2013
  • This paper presents structural topology optimization that is being applied for the design of electromagnetic vibration energy harvester. The design goal is to maximize the root-mean-square value of output voltage generated by external vibration leading structures. To calculate the output voltage, the magnetic field analysis is performed by using the finite element method, and the obtained magnetic flux linkage is interpolated by using Lagrange polynomials. To achieve the design goal, permanent magnet is designed by using topology optimization. The analytical design sensitivity is derived from the adjoint variable method, and the formulated optimization problem is solved through the method of moving asymptotes (MMA). As optimization results, the optimal location and shape of the permanent magnet are provided when the magnetization direction is fixed. In addition, the optimization results including the design of magnetization direction are provided.

Design Sensitivity Analysis and Topology Optimization for Electromagnetic Force (전자기력에 대한 설계민감도 계산 및 위상 최적화)

  • Moon, Hee-Gon;Wang, Se-Myung
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.708-710
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    • 2003
  • This paper presents design sensitivity analysis for the electromagnetic force and torque obtained from Coulomb's virtual work method using the adjoint variable method. And virtual displacement field is calculated from a static structural analysis. Derived equations are verified by comparison with finite different method. And topology optimization for a c-core is given as a verification example.

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Reliability-based Topology Optimization for Electromagnetic Systems (전자기 시스템의 신뢰성 기반 위상최적설계)

  • Kang, Je-Nam;Kim, Chwa-Il;Wang, Se-Myung
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.741-743
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    • 2003
  • A reliability-based topology optimization (RBTO) for electromagnetic systems using the finite element method is presented. Permeability and applied current density are considered as uncertain variable. In order to compute reliability constraints, performance measure approach is used. To find the reliability index, the limit state function is linearly approximated at each iteration. Numerical examples show the effectiveness of the proposed method.

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FEA & Topology Optimization of Single-Phase Induction Motor for Rotary Compressor (로터리 컴프레서용 단상 유도모터의 유한요소해석 및 위상 최적설계)

  • Kang, Je-Nam;Wang, Se-Myung
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.623-625
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    • 2001
  • The nonlinear transient characteristic of single-phase induction motor for rotary compressor is analysed by using FLUX2D. And the topology optimization is investigated and the TOPEM (Topology Optimization for Electromagnetic Systems) is developed using the finite element method (FEM). The proposed method is validated by applying it to the topology optimizations of single-phase induction motor for reducing the oil circulation rate (OCR).

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Electromagnetic topology optimization using large-step markov chain method with novel local optimization algorithm (LSMC를 이용한 전자기 위상 최적화)

  • Koh Yuri;Im Chang-Hwan;Jung Hyun-Kyo
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.944-946
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    • 2004
  • In this paper, a new technique for electromagnetic topology optimization is proposed. The proposed technique is based on the large-step Markov chain (LSMC) method with novel local optimization algorithm. Because the proposed algorithm keeps a good convergence characteristic of LSMC, fast convergence is assured. The proposed LSMC is verified by an application to an inverse reconstruction problem.

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Analysis of Coupling Effects in Transmission Lines Using the BLT Equation and Numerical Methods (BLT 방정식과 수치해석 기법을 이용한 전송 선로의 커플링 효과 분석)

  • Du, Jin-Kyoung;Ahn, Jae-Woon;Hwang, Sun-Mook;Yook, Jong-Gwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.1
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    • pp.99-103
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    • 2012
  • The electromagnetic topology and the BLT equation has been used as useful techniques to analyze coupling effects of huge devices. But in the case of systems including complex parts, applying the BLT equation can be difficult to manifest the complex parts with analytic solutions. To resolve this problem, a numerical method can be used to parts of the whole system in advance. In this paper, a microstrip line filter is analyzed using the BLT equation combined with numerical solutions. Consequently, achieved graphs from the BLT equation show good agreements with graphs obtained using a numerical method only.