• Title/Summary/Keyword: Vector finite element

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Analysis on Eddy Current Losses of High Speed Permanent Magnet Synchronous Motor for Turbo Compressor according to Voltage Source Driving (전압 구동 방법에 따른 터보 압축기용 초고속 영구자석 동기 전동기의 회전자 손실 해석)

  • Jang, Seok-Myeong;Kim, Hyun-Kyu;Ko, Kyoung-Jin;Lee, Sung-Ho;Hong, Young-Hee
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.712_713
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    • 2009
  • This paper deals with the analysis on eddy current looses of high speed permanent magnet synchronous motor (PMSM) for turbo compressor according to voltage source driving. This paper presents analytical procedures for calculation of the eddy current losses using Poynting theorem. On the basis of the magnetic vector potential and a two-dimensional (2-D) cylindrical coordinate system, this paper derived analytical solutions of the eddy current looses using phase current analysis. The eddy current losses of each harmonic obtained by fast Fourier transform (FFT) analysis of phase current are with results obtained from finite-element method (FEM).

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Analytical Prediction for the Cogging Torque of the Permanent Magnet Machines With Multi-Pole Rotor (다극회전자를 갖는 영구자석기기의 코깅토크에 대한 해석적 예측)

  • Jang, Seok-Myeong;Choi, Jang-Young;Ko, Kyoung-Jin;Park, Ji-Hoon
    • Proceedings of the KIEE Conference
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    • 2007.04c
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    • pp.56-58
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    • 2007
  • This paper deals with analytical prediction for the cogging torque of permanent magnet machines with multi-pole rotor First. open-circuit field solutions are derived using a magnetic vector potential and a two-dimensional (2-d) polar coordinate systems. On the basis of derived open-circuit field solutions and 2-d permeance functions. we also derive the analytical solutions for the open-circuit field considering stator slotting effects and cogging torque. All analytical results are shown in goof agreement with those obtained from finite element (FE) analyses.

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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 surface flashover along shield gap inner vacuum interrupter (진공 인터럽터 내부 쉴드간 gap에 따른 연면방전 특성파악)

  • Yoon, Jae-Hun;Lee, Seung-Su;Lim, Kee-Jo;Kim, Sung-Tae
    • Proceedings of the KIEE Conference
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    • 2008.10a
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    • pp.103-104
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    • 2008
  • this paper describes the electric field distribution analysis along a shield gap inner vacuum interrupter(VI). The equipotential line and electric field and field vector in a VI are analysed by a finite element method and experiment at shield gap. in result, The equipotential line and electric field distribution was affected to VI shield gap. The reason is as it gets distortion of equipotential line done. finally, this paper recognized whether or not affected, and proposed gap with the most suitable shield length and an external insulation.

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On the $L_2(\Omega)$-error for the p-version under numerical quadrature rules

  • Kim, Ik-Sung
    • Communications of the Korean Mathematical Society
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    • v.11 no.2
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    • pp.503-514
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    • 1996
  • We consider non-constant coefficient elliptic equations of the type -div(a \bigtriangledown u) = f$, and employ the P-version of the finite element method as a numerical method for the approximate solutions. To compute the integrals in the variational form of the discrete problem we need the numerical quadrature rule scheme. In practice the integrations are seldom computed exactly. In this paper, we give an $L_2(\Omega)$-error estimate of $\Vert u = \tilde{u}_p \Vert_{0,omega}$ in comparison with $\Vert u = \tilde{u}_p \Vert_{1,omega}$, under numerical quadrature rules which are used for calculating the integrations in each of the stiffness matrix and the load vector.

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A Study on Characteristic Impedance and Electromagnetic Distribution by the Edge Effect of Printed Cicuit Board Line (PCB선로의 끝단효과에 의한 특성임피던스 및 전자계분포에 관한 연구)

  • 장인범;박건호;이수길;김성렬;김용주;김영천;이준웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.04a
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    • pp.323-325
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    • 1997
  • Conventionally it is asummed that the microstrip line conductor has a rectangular cross-section. but the additive and substactive processes used to create conductors for PCBs produce a conductor of approximately Trapezoidal cross-section. For wide Strip line, the thickness and edge effect will be small since most of capacitance is parallel plate rather than fringing and we can ignore the cross-section. For narrow strip lines, the edge effect become immportant. So in this paper, we measure the chracteristic impedance of microstripline by Vector Analyzer and simulate the electromagnetic field of microstripline using finite element method with edge angle.

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Analysis of Output Characteristic in accordance with Airgap Variation in Switched Reluctance Motor and Brushless DC Motor (Switched Reluctance Motor와 Brushless DC Motor의 공극 변화에 따른 출력 특성 비교)

  • Yoon, C.H.;Park, K.K.;Lee, J.C.;Chun, Y.D.;Lee, Ju
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.843-845
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    • 2001
  • In this paper, we analyze the characteristics of electecromotive force(emf), phase current and torque according to the length of the air gap using 2nd order FEM(Finite Element Method) in Synchronous Reluctance Motor(SRH) and Brushless DC Motor(BLDC) with same volume and size. In the analysis with FEM, we applied the time-step function considering the motor switch in the magnetic vector potential of the unknown node.

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Design Optimization and Fabrication of an Advanced High Gradient Magnetic Separator

  • Park, E.B;Choi, S.D;Yang, C.J
    • Journal of Magnetics
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    • v.5 no.2
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    • pp.59-64
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    • 2000
  • A drum type of high gradient magnetic separator was designed and optimized by computer simulations. The magnetic separator consists of high performance rare earth $(Nd_2Fe_14B)$ permanent magnets and magnetic yokes of extremely low carbon steel interconnecting the permanent magnets. Magnetic circuits of the separator were simulated for the aim of the least cost, highest magnetic strength and most efficient function by using specialized S/W (Vector Field Program) employing the Finite Element Method. The magnetic flux density was provided to be strong enough to collect the invisible fine metal particles from the surface of hot rolled steel plate with the efficiency of almost 95%.

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A study on the secondary side eddy current distribution analysis of a short primary-short secondary single-sided LIM by the finite element method (유한요소법에 의한 단1차 단2차 편측식 선형 유도전동기의 2차측 와전류 분포 해석에 관한 연구)

  • Im, Dal-Ho;Kim, Hak-Lyun;Cho, Yun-Hyun;Kim, Dong-Jin
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.31-33
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    • 1989
  • In this paper, a short primary-short secondary single-sided LIM which is used as a driving source for automatic conveyor system, is selected as a analysis model. And with a method for analyzing eddy current distribution and thrust force which are produced according to the relative position of primary and secondary, FEM in which current vector potential is introduced is adopted. Also, analysis results are compared with experimental results, so propriety of this at study is proved.

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Comparison and Analysis of Armature Reaction Magnetic Field of Linear Generator with Coreless/Cored Type Three Phases Concentrated Winding by using Space Harmonic Analytical Method (3상 집중권 권선을 갖는 코어리스/코어드 타입 리니어 발전기의 공간고조파 해석법을 이용한 전기자 반작용 자계특성 해석)

  • Seo, Sung-Won;Koo, Min-Mo;Kang, Han-Bit;Choi, Jang-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.1
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    • pp.64-71
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    • 2015
  • This paper deals with analysis of armature reaction magnetic field of linear generator with three phases coreless/cored type concentrated winding. On the basis of a magnetic vector potential and Maxwell's equations, governing equations to predict armature reaction field are derived, and current density modeling is also performed analytically by using the Fourier series expansion. The analytical method used in this paper is confirmed by comparing with finite element analysis results.