• Title/Summary/Keyword: 3D Electromagnetic Simulation

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Comparison of Biot-Savart's Law and 3D FEM in the Study of Electromagnetic Forces Acting on End Winding

  • Kim, Ki-Chan
    • Journal of Electrical Engineering and Technology
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    • v.6 no.3
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    • pp.369-374
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    • 2011
  • An induction motor operated with high voltage source generally generates high current in starting mode and has a long transient time after being started. This large and sustaining starting current causes the end windings of the stator to have excessive electromagnetic force. This force is the source of vibration and has a negative and serious influence on the insulation of end windings. Therefore, designing the end winding part with an appropriate support system is needed. To design the support ring enclosing the end windings, we analyze the distribution of electromagnetic force on the end windings by applying the Biot-Savart's law and the 3D finite element method (FEM), and comparing two simulation methods. Finally, we verify the safety of the support structure of the end winding part using stress analysis, which is analyzed with the electromagnetic forces from the 3D FEM simulation.

Effective 3-D FEM for large-scale high temperature superconducting racetrack coil

  • Huang, Xiangyu;Huang, Zhen;Xu, Xiaoyong;Li, Wan;Jin, Zhijian
    • Progress in Superconductivity and Cryogenics
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    • v.21 no.3
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    • pp.32-37
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    • 2019
  • In various types of large-scale electrical applications, the number of coil turns in such machines is usually large. Electromagnetic simulation of large-scale superconducting coils (tens to hundreds of turns) is indispensable in the design process of superconducting electrical equipment. However, due to the large scale of the coil and the large aspect ratio of super-conducting material layer in HTS coated conductor, it is usually difficult or even unable to perform 3-D transient electromagnetic simulation. This paper introduces an effective 3-D electromagnetic simulation method for large-scale HTS coated conductor coil based on T-A formulation. The simulation and experimental results show that the 3-D model based on the T-A formulation using homogeneous strategy is more accurate than the traditional 2-D models. The memory usage is not sensitive to the number of turns and this model will be even more superior as the number of turns becomes larger.

Sensitivity Analysis of Numerical Variables Affecting the Electromagnetic Forming Simulation of a High Strength Steel Sheet Using a Driver Sheet (수치적 변수들이 배면판을 이용한 고강도 강판의 전자기 성형 해석에 미치는 영향도 분석)

  • Park, H.;Lee, J.;Lee, Y.;Kim, J.H.;Kim, D.
    • Transactions of Materials Processing
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    • v.28 no.3
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    • pp.159-166
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    • 2019
  • Electromagnetic forming (EMF) simulations consider 3-dimensionally coupled electromagnetic-mechanical phenomenon using LS-DYNA, therefore the calculation cost is normally expensive. In this study, a sensitivity analysis in regard to the simulation variables affecting the calculation time was carried out. The EMF experiments were conducted to form an elliptically protruding shape on a high-strength steel sheet, and it was predicted using LS-DYNA simulation. In this particular EMF simulation case, the effect of several simulation variables, viz., element size, contact condition, EM-time step interval, and re-calculation number of the EM matrices, on the shape of elliptical protrusion and the total calculation time was analyzed. As a result, reasonable values of the simulation variables between the simulation precision and calculation time were proposed, and the EMF experiments with respect to the charging voltages were successfully predicted.

Absorbing Boundary Conditions and Parallelization for Waveguide Electromagnetic Analysis Using Finite Element Method (유한요소법을 이용한 도파관 전자기 해석의 흡수경계조건 고찰 및 병렬화)

  • Park, Woobin;Kim, Moonseong;Lee, Woochan
    • Journal of Internet Computing and Services
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    • v.23 no.3
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    • pp.67-76
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    • 2022
  • Power and signal transmission using electromagnetic waves are essential in modern times, and a guided structure is needed to transmit electromagnetic waves efficiently through the desired path. This paper performed an electromagnetic simulation using the in-house code for the 2-D/3-D waveguide using the finite element method. The accuracy of the analysis was verified by comparing it with the results of HFSS, a representative electromagnetic wave simulation software. In addition, the performance of the Absorbing Boundary Condition (ABC), which is essential to truncate the infinite computational domain for computational electromagnetics, was analyzed. Finally, the parallelization technique was applied to accelerate the simulation speed, demonstrating performance improvement.

Properties of Electromagnetic Field Distribution of Inductive Ferrite Coil for the Antenna Design of the Electrodeless Fluorescent Lamp (무전극 형광램프 안테나 설계를 위한 페라이트 유도코일의 전자계 분포 특성 분석)

  • Jo, Ju-Ung;Kim, Kwang-Soo;Choi, Yong-Sung;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • 2004.07c
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    • pp.1957-1959
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    • 2004
  • In this paper, maxwell 3D finite element analysis program was used to obtain electromagnetic properties associated with the coil and nearby structures. The electromagnetic emitting properties were presented by 3D simulation software operated at 2.56[MHz] and some specific conditions.

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Design of Reflector Type Frequency Doubler for Undesired Harmonic Suppression Using Harmonic Load Pull Simulation Technique

  • Jang, Jae-Woong;Kim, Yong-Hoon
    • Journal of electromagnetic engineering and science
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    • v.7 no.4
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    • pp.175-182
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    • 2007
  • In this paper, a study on the reflector type frequency doubler, to suppress the undesired harmonics, is presented. A 12 to 24 GHz reflective frequency doubler is simulated and experimented. Design procedure of the frequency doubler with reflector is provided and the frequency doubler with good spectral purity is fabricated successfully. It has harmonic suppression of the $40{\sim}50\;dBc$ in the $1^{st}$ harmonic and the $50{\sim}60\;dB$ in the $3^{rd}$ harmonic with no additional filter. And, it has conversion gain with the input power of 0 dBm over bandwidth of 500 MHz. A NEC's ne71300(N) GaAs FET is used and the nonlinear model(EEFET3) using IC-CAP program is extracted for harmonic load pull simulation. Good agreement between simulated and measured results has been achieved.

A Novel Compact Metamaterial Zeroth Order Resonant Bandpass Filter for a VHF Band and Its Stopband Improvement by Transmission Zeros

  • Kahng, Sungtek;Jang, Geonho
    • Journal of electromagnetic engineering and science
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    • v.13 no.4
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    • pp.263-266
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    • 2013
  • A novel compact and low-loss VHF bandpass filter is presented with enhanced stopband performance using metamaterial zeroth order resonator (ZOR) characteristics. An in-line ZOR filter is initially suggested and changed to have transmission zeros (TZs) due to source-load coupling for effective improvement of the isolation from UHF wireless channels. The proposed filter is smaller than 1/10 of the conventional filters in terms of size and has relatively very low insertion loss (< 1 dB for the electromagnetic (EM) simulation and < 3 dB for the measurement) and return loss (<-20 dB) in the passband due to the approximately 80% size reduction and the higher isolation in the stopband due to the TZs. The circuit and EM simulation are in good agreement with the measurements.

LOW NOISE AMPLIFIER USING ELECTROMAGNETIC SIMULATOR AT U-NII FREQUENCY BAND

  • Kim, Hak-Sung;Kim, Cheol-Su;Kim, Cheol-Su;Lee, Byung-Jae;Lee, Jong-Chul;Kim, Nam-Young
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.225-228
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    • 2000
  • In this paper, the design for a low noise amplifier with the EM simulation is presented. The ATF36077 pHEMT device is applied to design LNA for U-NII frequency band (5 GHz ~ 6 GHz). The matching networks have been designed by the only open ended stub in order to reduce parasitic effects generated from a via structure. Through EM simulator, the simulation result shows that the linear gain (@5.5 GHz) is over 10 dB, input return loss and output return loss (@ 5.5 GHz) are a below 10 dB respectively, and the 3rd order intercept point is about 17 dBm.

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A Study on the Development and Optimization Design of Isolator by Using the 3D Simulator (3D Simulator를 이용한 아이솔레이터 최적화 설계 및 개발에 관한 연구)

  • Jung Seung-Woo;Choi U-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.3 s.106
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    • pp.229-238
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    • 2006
  • In this paper, developed study about isolator that after design and optimizes center strip to use 3-D simulator. We use the factor about the change and propose simple mode of the simulation. Design strip line that center frequency is 1.85 GHz by software that use 3-D finite element method(FEM) and confirmed variable. Developed isolator were shown that more than isolation 25 dB, reflection loss has the more than 25 dB and insertion loss does not 0.2 dB. We could confirm that compare with simulation and manufacture sample propertied agrees more than 90 %.

Electromagnetic Field Distribution Analysis on Reverberation Chamber using Electromagnetic Diffusion Method (전자파 확산방식을 이용한 잔향실 내부의 필드 분포 해석)

  • 이광순;이중근;정삼영
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.5
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    • pp.839-848
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    • 2000
  • This paper presents the results of an electromagnetic field analysis for a reverberation chamber that is an alternative method of a shielded anechoic chamber, which is widely used for the analysis and measurement of electromagnetic interference and immunity test. Inside the defined test volume of the rectangular and triangular type, the Schroeder Quadratic Residue Diffuser was employed. FDTD(Finite-Difference Time-Domain) simulation method was applied to produce the field characteristics inside those reverberation chambers. According to the results, field uniformities on the aforementioned two types of reverberation chambers were correlated within $\pm$3dB, and $\pm$4.4dB tolerances, and rectangular type reverberation chamber shows an independent polarization result.

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