• Title/Summary/Keyword: magnetic field analysis

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A Study on Magnetic Field Distribution Characteristics for Remote Field Area (리모트 필드 영역에서의 자계 분포특성에 관한 연구)

  • Kim, S.K.;Lee, E.U.;Lim, S.S.;Kim, K.H.
    • Proceedings of the KIEE Conference
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    • 2000.11b
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    • pp.312-314
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    • 2000
  • The electric wave propagation characteristics of electromagnetic field by induction current shows a nonlinear distinction in the metal but linear on air. This paper is written about the magnetic transmission distinction in the metalic tube, which wrapped the center axis by the same direction. The electromagnetic field made by the transmission signal is transferred from the transmission coil area toward the receiving coil by the magnetic diffusion. So, it is different magnetic flux around the coil with one in the remote field area. Analyzing such a complex magnetic characteristic, we verified this theory by the vector analysis and presented eddy current mechanism and analytical model about magnetic distribution in the remote field area. This magnetic distribution rate in metal body will be very useful in the nondestructive inspection of the eddy current in remote field which is recently rising as a new technology.

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Analysis Magnetic Field for Basic Design of Autonomous System by Magnetic Guidance (자기궤도 자율주행시스템 기본설계를 위한 자계특성분석)

  • Lim Dae Young;Ryoo Young Jae;Kim Eui Sun;Mok Jai Kyun
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.181-186
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    • 2005
  • In this paper, an estimation system of vehicle position and orientation on magnetic lane, which is a parameter of the steering controller for automated lane follwing is described. To verify that the magnetic dipole model could be applied to a magnetic unit paved in roadway, the analysis of the the data 3-axis magnetic field measured experimentally.

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Estimation of Output Voltage and Magnetic Flux Density for a Wireless Charging System with Different Magnetic Core Properties

  • Park, Ji Hea;Kim, Sang Woo
    • Journal of Magnetics
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    • v.18 no.2
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    • pp.105-110
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    • 2013
  • The design model and key parameters of the material design for the control of induced magnetic flux at the near-field and efficient power transfer in a modified wireless power transfer (WPT) system with a large air gap of wireless electric vehicles were investigated through analytical simulations for magnetic vector and time-domain transient analysis. Higher saturation magnetic core with low core loss induced a stronger vertical magnetic field by the W-type primary coil in the WPT system with a gap of 20 cm at 20 kHz, which is shown from the vector potentials of the magnetic induction. The transient analysis shows that the higher magnetic fluxes through the pick-up cores lead to a linear increment of the alternating voltage with a sinusoidal waveform in the non-contact energy transfer system.

Coupled Field Circuit Analysis for Characteristic Comparison in Barrier Type Switched Reluctance Motor

  • Lee J.Y.;Lee G.H.;Hong J.P.;Hur J.;Kim Y.K.
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.3
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    • pp.267-271
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    • 2005
  • This paper deals with two kinds of novel shape switched reluctance motors (SRM) with magnetic barriers in order to improve operating performances of prototype. The magnetic barriers make rotor poles more saturated, and consequently inductance profiles are distorted. The changed inductance affects input current shape and eventually torque characteristics. In order to analyze the complicated flux pattern of the SRM with magnetic barriers and its terminal characteristics simultaneously, coupled field circuit modeling method is used. The finite element method is used to model the nonlinear magnetic field, and coupled to the circuit model of the SRM overall system. After experimental results are presented to prove the accuracy of the method, the several analysis results are compared, and the improved rotor shape is presented.

Analysis on Harmonics Characteristics of ELF Magnetic Fields Generated by Electric Appliances (가전기기 발생 극저주파 자계 고조파 특성 해석)

  • Min Suk-Won;Song Ki-Hyun;Yang Kwang-Ho;Ju Mun-No
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.1
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    • pp.31-37
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    • 2005
  • With biological effects by ELF(Extremely Low Frequency) magnetic field generated from power system, the transient magnetic field from electric appliances is a major issue presently. In this paper, we measured magnetic field distributions around electric appliances in view of harmonics and analyzed them by the use of an equivalent magnetic dipole moment method. This method was applied to 19 types of appliances, and their equivalent magnetic dipole moments and harmonic components were determined. The results show that this method is applicable to many appliances and the higher frequency magnetic field may induce higher current inside living bodies.

A Study on the Rheology Characteristics of Magnetic Fluids in a Circular Pipe (원관내 자성유체의 Rheology 특성에 관한 연구)

  • Jeon, Eon-Chan;Park, Joung-Woo;Kim, Tae-Ho;Kim, Soo-Yong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.7 no.2
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    • pp.38-44
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    • 2008
  • In the present paper, we theoretically analyze the flow of magnetic fluids in a circular pipe with a vertical magnetic field and investigate the magnetic response by the external magnetic field. Theoretical study through the governing equation derived by Siliomis is carried out with numerical analysis by the Gauss Elimination Method. Using polar and magnetic effect parameters, theoretical equations and distributions for the velocity, apparent viscosity as the magnetic response are shown. Especially, in the region of strong magnetic field the specific property is appeared by finding a critical magnetic effect parameter for a polar effect parameter.

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Quasi-3D analysis of Axial Flux Permanent Magnet Rotating Machines using Space Harmonic Methods (공간고조파법을 이용한 축 자속 영구자석 회전기기의 준(準)-3D 특성 해석)

  • Choi, Jang-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.5
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    • pp.942-948
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    • 2011
  • This paper deals with characteristic analysis of axial flux permanent magnet (AFPM) machines with axially magnetized PM rotor using quasi-3-D analysis modeling. On the basis of magnetic vector potential and a two-dimensional (2-D) polar-coordinate system, the magnetic field solutions due to various PM rotors are obtained. In particular, 3-D problem, that is, the reduction of magnetic fields near outer and inner radius of the PM is solved by introducing a special function for radial position. And then, the analytical solutions for back-emf and torque are also derived from magnetic field solutions. The predictions are shown in good agreement with those obtained from 3-D finite element analyses (FEA). Finally, it can be judged that analytical solutions for electromagnetic quantities presented in this paper are very useful for the AFPM machines in terms of following items : initial design, sensitivity analysis with design parameters, and estimation of control parameters.

Analysis of Magnetic Field of Superconducting Winding According to the Changed Damper Thickness and Material (댐퍼의 두께와 재질 변화에 따른 초전도 선재에 미치는 자장특성 분석)

  • Jeong, Jae-Sik;Lee, Sang-Ho;Hong, Jung-Pyo;Jo, Young-Sik
    • Progress in Superconductivity and Cryogenics
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    • v.14 no.3
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    • pp.5-8
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    • 2012
  • Superconducting windings of synchronous machine have to be operated in below the critical temperature, critical current density and critical magnetic field. If one of these characteristics does not satisfied, then the quench occurred in superconducting winding. Especially the armature current dramatically increased as the superconducting generator is short-circuited at the rated load condition and magnetic field in field winding increased due to the armature current. Therefore, damper is required to reduce the magnetic field of field winding which increases reliability of the superconducting generator. Damper dimension can be decided by time constant[1-2]. In this paper the basic model is high-power and low-speed superconducting generator. Damper time constant was calculated from the changed damper thickness and material. Magnetic flux of field coil at the basic model and changed damper time constant model is analyzed.

Analysis of the electromagnetic phenomena in vacuum interrupter with axial magnetic field type for Safety break (안전차단을 위한 축자계형 진공인터럽터의 전자계 현상 해석)

  • 서상현
    • Journal of the Korea Safety Management & Science
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    • v.5 no.4
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    • pp.87-95
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    • 2003
  • The purpose of this paper is analyses about in 12kV/50kA vacuum interrupter with an axial magnetic field type electrode system through the studies of electromagnetic phenomena for the possess of Safety break. Vacuum interrupter is important in electric safety part. In this paper, we performed analysis of electric field, magnetic field, current density in AMF electrode using the Maxwell 3D simulation.

Analysis of the Electromagnetic Phenomena in Vacuum Interrupter with Axial Magnetic Field Type (축자계형 진공인터럽터의 전자계 현상 해석)

  • 하성철;서상현
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.10
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    • pp.952-957
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    • 2003
  • The purpose of this paper is analyses about in 12kV/50kA vacuum interrupter with an axial magnetic field type electrode system through the studies of electromagnetic phenomena. Vacuum interrupter is important in electric safety part. In this paper, we performed analysis of electric field, magnetic field, current density in AMF electrode using the Maxwell 3D simulation. The current distribution and magnetic field in simple models are analyzed to verify its efficiency and accuracy. In addition the validity of FEM is confirmed by performing the analyses of distribution in current density and magnetic flux density.