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Magnetics, IEEE Transactions on

Issue 5 • Date May 2013

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Displaying Results 1 - 25 of 225
  • Front cover

    Publication Year: 2013 , Page(s): C1
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  • IEEE Transactions on Magnetics publication information

    Publication Year: 2013 , Page(s): C2
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  • Table of Contents

    Publication Year: 2013 , Page(s): 1533 - 1549
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  • CEFC 2012 Chairman’s Foreword

    Publication Year: 2013 , Page(s): 1550
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  • CEFC 2012 Publication Chairman's foreword

    Publication Year: 2013 , Page(s): 1551
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  • CEFC 2012 Committee

    Publication Year: 2013 , Page(s): 1552
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  • Generalized Magnetostatic Analysis by Boundary Integral Equation Derived From Scalar Potential

    Publication Year: 2013 , Page(s): 1553 - 1556
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (972 KB) |  | HTML iconHTML  

    The volume integral equation approach replaces the loop currents over the volume elements in magnetic material with the loop currents on the material surface to derive a boundary integral equation (BIE). The surface loop current is equivalent to the double layer charge, which offers an integral form of scalar potential to give the BIE. Once BIE has been solved, the loop current gives the magnetic flux density B by Biot-Savart law. The BIE has many advantages such as giving accurate solutions and evaluating B at edges and corners. But it has some severe drawbacks due to a multi-valued function of the excitation potential caused by the source currents and that is why its application has been restricted mostly to simply connected problem. This paper presents a novel generalized approach, which is applicable for solving generic problems such as multi-material, multiply connected and thin shielding problems. View full abstract»

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  • Parallelization of Finite Element Analysis of Nonlinear Magnetic Fields Using GPU

    Publication Year: 2013 , Page(s): 1557 - 1560
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (635 KB) |  | HTML iconHTML  

    The acceleration of a nonlinear magnetic field analysis by parallelizing the finite element method (FEM) is examined using the graphics processing unit (GPU). It is shown that the speedup of the magnetic field analysis is realized by parallelizing the variable preconditioned conjugate gradient (VPCG) method. The Jacobi over-relaxation (JOR) method, conjugate residual (CR) method and conjugate gradient (CG) method are also applied in the variable preconditioning. The results of computations demonstrate that VPCG using the GPU significantly improve the performance. Especially, CG applied by variable preconditioned on GPU is 39 times faster than ICCG on a CPU. View full abstract»

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  • Instantaneous Power Balance Analysis in Finite-Element Method of Transient Magnetic Field and Circuit Coupled Computation

    Publication Year: 2013 , Page(s): 1561 - 1564
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1161 KB) |  | HTML iconHTML  

    An instantaneous power balance analysis of time-domain finite-element method for transient 2-dimensional (2-D) magnetic field and electric circuit coupled computation is presented. Based on the principle of instantaneous power balance and the technique of matrix analysis, formulations for the computation of instantaneous reactive power, active power and eddy-current loss in solid conductors are put forward. The merit of the proposed algorithm is that the integration method for the loss computation is exactly the same as that for the system equations. Therefore, additional numerical errors arising from the integration in loss computation can be avoided. It clarifies the methods for eddy-current loss computation in solid conductors. The precise identification of instantaneous real power and reactive power is expected to pave the way for a new and accurate approach to extract the instantaneous ac resistances and inductances of the equivalent electric circuit. The concept of instantaneous power balance can also be used for force and torque computations. View full abstract»

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  • Large-Scale Magnetostatic Domain Decomposition Analysis Based on the MINRES Method

    Publication Year: 2013 , Page(s): 1565 - 1568
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1091 KB) |  | HTML iconHTML  

    This paper describes a large-scale 3D magnetostatic analysis using the Domain Decomposition Method (DDM). To improve the convergence of an interface problem of DDM, DDM based on the Conjugate Residual (CR) method or the MINimal RESidual (MINRES) method is proposed. The CR or MINRES method improves convergence rate and shows stable convergence behavior in solving the interface problem, compared with the Conjugate Gradient (CG) method, and reduces the computation time for a large-scale problem with 100 million degrees of freedom. View full abstract»

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  • A Stability Improvement Technique Using PML Condition for the Three-Dimensional Nonuniform Mesh Nonstandard FDTD Method

    Publication Year: 2013 , Page(s): 1569 - 1572
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1284 KB) |  | HTML iconHTML  

    We propose a technique to improve the stability of three-dimensional (3D) nonuniform mesh nonstandard FDTD (NS-FDTD) calculations. To mitigate the numerical instability arising from the connection of different-sized meshes, our method combines the usual interpolation fields and perfectly matched layer (PML) condition at mesh interfaces. We examine a connection for a mesh size ratio of 3:1, and show numerically that our technique improves the stability of 3D NS-FDTD calculation on nonuniform meshes. Our technique is also applied to analyze the fields around a periodic slot panel. View full abstract»

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  • Nonlinear Magnetostatic Analysis by Unified BIE Utilizing Potential Gap Due to Loop Currents

    Publication Year: 2013 , Page(s): 1573 - 1576
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (999 KB) |  | HTML iconHTML  

    Since the line loop current is equivalent to the double layer charge, it gives an integral form of scalar potential. The segmental loop current on the interface between magnetic materials produces a potential gap, which works to give a boundary integral equation (BIE). By virtue of another potential gap due to a fictitious circulating current along the contour of cut-surface in the material, the excitation potential becomes single valued and the BIE becomes applicable to generic problems without any restriction. Regarding the nonlinear magnetic material as composed of segmental materials with different values of permeability, we get the same BIE for the nonlinear analysis as for the linear analysis. In order to check the adequacy and effectiveness of the nonlinear BIE, we solve a typical magnetostatic problem and compare the computed results with those by the conventional magnetic moment method. View full abstract»

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  • Study of an Explicit Meshless Method Using RPIM for Electromagnetic Fields

    Publication Year: 2013 , Page(s): 1577 - 1580
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1070 KB) |  | HTML iconHTML  

    An explicit meshless method for analyzing electromagnetic fields is proposed in this paper. In the proposed method, the wave equation and the Lorentz gauge are discretized using the radial point interpolation method (RPIM) and Newmark's β method. The Taylor series expansion is also used to obtain an explicit scheme. The proposed method has been applied to the following examples: the magnetic field from a square coil, a Hertz dipole, and an eddy current in a thin plate. The potential of the proposed method has been confirmed through these examples. View full abstract»

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  • Parallel Performance of Multithreaded ICCG Solver Based on Algebraic Block Multicolor Ordering in Finite Element Electromagnetic Field Analyses

    Publication Year: 2013 , Page(s): 1581 - 1584
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (724 KB) |  | HTML iconHTML  

    We present a parallel multithreaded incomplete Cholesky-conjugate gradient (ICCG) solver for a linear system derived from a finite element electromagnetic field analysis. Algebraic block multicolor ordering is introduced to parallelize the solver with a high cache hit ratio and convergence comparable to the sequential solver. We develop the parallel ICCG solver based on reordering with modification for electromagnetic field analyses involving external circuits. The numerical results from practical models show that a 2.6- to 3.8-fold speedup compared with the sequential solver is attained using eight cores. View full abstract»

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  • RPCA-Based Noise Suppression in MEG Measurement for Improving Bio-Electromagnetic Source Estimation

    Publication Year: 2013 , Page(s): 1585 - 1588
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (701 KB) |  | HTML iconHTML  

    Magnetoencephalography (MEG) is a promising technology, which could be used in a variety of biomedical applications. However, MEG electromagnetic measurement is usually degraded by noise. Noise suppression in MEG measurement is particularly challenging because it is difficult to remove the noise and preserve the information components in the MEG data. In this study, a novel noise suppression method, based on robust principal component analysis (RPCA) technique, is presented and applied to the estimation of bio-electromagnetic field in source space for the first time. The proposed method gives a constrained optimization of MEG electromagnetic domain transformations such that the matrix of transformed MEG measurement can be decomposed as the sum of a sparse matrix of noise and a low-rank matrix of denoised data. Applying the proposed method to a number of simulations showed significant improvement of the result accuracy. View full abstract»

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  • A Region-Based Approach for Investigating the Origin of Bioelectromagnetic Activities in MEG Source Space

    Publication Year: 2013 , Page(s): 1589 - 1592
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (751 KB) |  | HTML iconHTML  

    In the present study, we develop a region-based approach, which integrates a novel bioelectromagnetic source inverse technique, together with the use of connectivity analysis method, i.e., directed transfer function (DTF), in investigating the origin of activities in MEG source space. The results confirm that the proposed approach is a promising noninvasive tool for the bioelectric field analysis and biomedical applications. In particular, since the regions are defined according to criteria of functional requirements for biomedical applications, the result obtained by the proposed method is easier to understand and interpret, and moreover, the result also facilitates inter-subject comparisons of the source connectivity analysis. View full abstract»

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  • Field Calculations for Magnetic Shielding: Fourier Modeling Extended With Mode-Matching Technique Applied on a Shield With Finite Dimensions

    Publication Year: 2013 , Page(s): 1593 - 1596
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (697 KB) |  | HTML iconHTML  

    In this paper, a semi-analytical model is derived to calculate the magnetic flux density around a magnetic shield with finite dimensions. The proposed modeling is based on Fourier modeling, which is extended with mode-matching. The described model has less than 0.2(%) error with respect to finite element modeling for the given configuration. Furthermore, the paper shows that assuming a magnetic shield with infinite dimensions introduces a significant error with respect to a magnetic shield with finite dimensions. View full abstract»

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  • A Priori Error Indicator in the Transformation Method for Problems With Geometric Uncertainties

    Publication Year: 2013 , Page(s): 1597 - 1600
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1011 KB) |  | HTML iconHTML  

    To solve stochastic problems with geometric uncertainties, one can transform the original problem in a domain with stochastic boundaries and interfaces to a problem defined in a deterministic domain with uncertainties in the material behavior. The latter problem is then discretized. There exist infinitely many random mappings that lead to identical results in the continuous domain but not in the discretized domain. In this paper, an a priori error indicator is proposed for electromagnetic problems with scalar and vector potential formulations. This leads to criteria for selecting random mappings that reduce the numerical error. In an illustrative numerical example, the proposed a priori error indicator is compared with an a posteriori estimator for both potential formulations. View full abstract»

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  • Accuracy Improvement of Extended Boundary-Node Method

    Publication Year: 2013 , Page(s): 1601 - 1604
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1010 KB) |  | HTML iconHTML  

    The extended boundary-node method (X-BNM) has been modified for improving the accuracy degradation due to the boundary shape and its performance has been numerically investigated by comparing with the standard one. For the case where the boundary shape is strongly concave, the results of computations show that the accuracy of the modified X-BNM is always higher than that of the standard one. In addition, the speed of the modified X-BNM is almost equal to that of the standard one. Therefore, it is found that the performance of the modified X-BNM is much superior to that of the standard one. View full abstract»

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  • Solution of Large Stochastic Finite Element Problems—Application to ECT-NDT

    Publication Year: 2013 , Page(s): 1605 - 1608
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (984 KB) |  | HTML iconHTML  

    This paper describes an efficient bloc iterative solver for the spectral stochastic finite element method (SSFEM). The SSFEM was widely used to quantify the effect of input data uncertainties on the outputs of finite element models. The bloc iterative solver allows reducing computational cost of the SSFEM. The method is applied on an industrial nondestructive testing (NDT) problem. The numerical performances of the method are compared with those of the nonintrusive spectral projection (NISP). View full abstract»

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  • A Quantum-Inspired Evolutionary Algorithm for Multi-Objective Design

    Publication Year: 2013 , Page(s): 1609 - 1612
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (481 KB) |  | HTML iconHTML  

    To explore the full potential of Quantum-inspired Evolutionary Algorithms (QEA) in multiobjective design optimizations, a vector QEA is proposed. To fulfill the two ultimate goals of a vector optimizer in finding and uniformly sampling the Pareto front of a multi-objective inverse problem, a fitness assignment formula to consider the number of improvements in the whole objective functions and the amount of the improvement in a specified objective function, as well as the use of a selection mechanism in choosing the so far searched best solutions, are proposed in this paper. The information sharing and the increment angle updating components of the scalar QEA have also been redesigned according to the characteristics of multi-objective inverse problems. Numerical results on two case studies are presented to validate the proposed vector QEA. View full abstract»

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  • Large-Scale Simulation of Electromagnetic Wave Propagation Using Meshless Time Domain Method With Parallel Processing

    Publication Year: 2013 , Page(s): 1613 - 1616
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (639 KB) |  | HTML iconHTML  

    The large-scale simulation of the electromagnetic wave propagation using meshless time domain method (MTDM) is numerically investigated. Moreover, compute unified device architecture (CUDA) and OpenMP is adopted for parallelization technique to reduce the computation time. The results of computation show that the execution time of the time evolution calculation on GPU is 8.8 time faster than that of CPU. In addition, the execution time of the shape function generation procedure can be speedup about 7842 times by proposed scheme and OpenMP. View full abstract»

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  • Quantum Cellular Automaton for Simulating Static Magnetic Fields

    Publication Year: 2013 , Page(s): 1617 - 1620
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (725 KB) |  | HTML iconHTML  

    This paper proposes a new quantum cellular automaton (quantum CA) for simulating macroscopic electromagnetic fields. The final target is to simulate the macroscopic electromagnetic fields on a quantum computer. In the proposal approach, Maxwell's historical model, which was explained the nature of electromagnetic fields in 1861, has been modified for a quantum CA model to simulate the electromagnetic fields. Then, a state transition rule for CA is determined by a strategy based on the quantum mechanics and the quantum computation theories. One of originalities of the proposed approach is that a system using quantum gates is superstructed to simulate magneto-static fields from currents. First, a modified Maxwell model for applying to quantum CA was shown. Second, by using the quantum computation theory, a quantum gate system to simulate the magnetic fields from currents was described. Finally, the proposed approach was applied to an example of magnetostatic field simulation. View full abstract»

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  • Coupled Magneto-Mechanical Analysis Considering Permeability Variation by Stress Due to Both Magnetostriction and Electromagnetism

    Publication Year: 2013 , Page(s): 1621 - 1624
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (959 KB) |  | HTML iconHTML  

    A general model for the coupled analysis of magneto-mechanical systems is developed by minimizing the continuum energy functional of the system using the calculus of variation. This approach, which is in contrast with the traditional approach of minimizing after discretization, allows the use of strain and stress tensors, vector identities and the divergence theorem, and results in coupled governing equations of the system with three coupling terms; the magnetic stress tensor, the magnetostriction stress tensor, and the magnetostriction reluctivity. The model uses the information contained in the set of experimental magnetostriction curves dependent on stress to calculate the permeability variation due to stress. The governing equations are then discretized using the Galerkin method resulting in methods for the calculation of nodal magnetic and magnetostriction forces including the coupling effects. Finally the model is applied to a simple 2D problem and the flux density distributions using the proposed method and the traditional method of using experimental magnetization curves are compared. View full abstract»

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  • Efficient Compression of 3-D Eddy Current Problems With Integral Formulations

    Publication Year: 2013 , Page(s): 1625 - 1628
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1244 KB) |  | HTML iconHTML  

    For the calculation of eddy current problems using integral formulations, compression techniques are needed due to the fully populated system matrix. As the system matrix is ill-conditioned, even low compression leads to very high errors and is in most cases unsolvable with classical iterative solvers like CG or GMRES. By using regularization techniques, the condition number is enormously reduced, so that high compression rates can be achieved. In this paper the efficiency of the Block Wavelet Compression combined with the Tikhonov regularization is shown by 3-D eddy current problems. The use of the so called Block Wavelet Compression is presented for the first time for eddy current problems using integral formulations. View full abstract»

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Aims & Scope

IEEE Transactions on Magnetics publishes research in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage.

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Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology