# IEEE Transactions on Magnetics

## Issue 3  Part 1 • May 1999

This issue contains several parts.Go to:  Part 2

## Filter Results

Displaying Results 1 - 25 of 203
• ### Proceedings of the Eighth Biennial IEEE Conference on Electromagnetic Field Computation

Publication Year: 1999
| PDF (204 KB)
• ### A proof of the perfect matching property of PMLs in static fields

Publication Year: 1999, Page(s):1139 - 1142
Cited by:  Papers (5)
| | PDF (385 KB)

An improved proof of the perfect matching property of fictitious anisotropic layers (PMLs) with the product of the relative permittivities in two directions equal to 1 is presented for the static case. An example involving a three-dimensional magnetic problem also illustrates the feasibility of PMLs for magnetostatic fields. View full abstract»

• ### Non-linear models for the design of solid rotor induction machines

Publication Year: 1999, Page(s):1310 - 1313
Cited by:  Papers (5)
| | PDF (372 KB)

Two finite element methods are used to calculate the steady-state performances of solid iron rotor induction machines. They are applied to both smooth and slitted rotors and are used to define the rotor form which provides the maximum torque for the rated value of the slip. The mean torque-slip characteristics calculated under constant voltages are compared to experimental results. View full abstract»

• ### Robust shape optimization of electromechanical devices

Publication Year: 1999, Page(s):1710 - 1713
Cited by:  Papers (17)
| | PDF (379 KB)

This paper presents the robust shape optimization of electromechanical devices considering the uncertainties of design variables based on numerical optimization technique and finite element method (FEM). In the formulation of robust optimization, the multiobjective function is composed of the mean and the standard deviation of original objective function, while the constraints are supplemented by ... View full abstract»

• ### Author index

Publication Year: 1999, Page(s):1901 - 1903
| PDF (199 KB)
• ### Performance improvement of a hybrid optimization algorithm for electromagnetic devices design

Publication Year: 1999, Page(s):1698 - 1701
Cited by:  Papers (2)
| | PDF (376 KB)

In this paper, an investigation of the behavior of a recently defined hybrid algorithm for continuous variables electromagnetic optimization problems is presented. This algorithm makes use of the nonlinear simplex method as a principal optimizator, and a greedy genetic algorithm to explore the search space. The algorithm is greatly affected by the tuning of some parameters. Referring to a solenoid... View full abstract»

• ### Tabu search metaheuristics for electromagnetic problems optimization in continuous domains

Publication Year: 1999, Page(s):1694 - 1697
Cited by:  Papers (8)
| | PDF (436 KB)

This paper presents a tabu search based strategy which is applied to optimize the objective function associated with the design of a solenoid system. The strategies used to apply tabu search in a continuous domain are developed without increasing computational effort with respect to the corresponding discrete problem. Algorithms developed for discrete problems used to self-tune tabu search paramet... View full abstract»

• ### Heat analysis of thermal overload relays using 3-D finite element method

Publication Year: 1999, Page(s):1658 - 1661
Cited by:  Papers (3)
| | PDF (324 KB)

In designing a thermal overload relay, it is necessary to analyze the thermal characteristics of several trial models. Up to now, this has been done by measuring the temperatures on a number of positions in the trial models. This experimental method is undoubtedly expensive. In this paper, the temperature distribution of a thermal overload relay is obtained by using 3-D finite element analysis tak... View full abstract»

• ### Thermal analysis of PTC applied resin heater using 3-D finite element method

Publication Year: 1999, Page(s):1654 - 1657
Cited by:  Papers (1)
| | PDF (356 KB)

This paper introduces a computational method for predicting the temperature characteristics of PTC (positive temperature coefficient) applied resin heater. In this method, a current vector analysis is coupled with a thermal analysis using the 3-D finite element method. Transient thermal analysis is carried out to compute the temperature distribution of the heater after computing the Joule loss by ... View full abstract»

• ### Optimal design of high voltage bushing electrode in transformer with evolution strategy

Publication Year: 1999, Page(s):1690 - 1693
Cited by:  Papers (5)
| | PDF (280 KB)

The application of an evolution strategy for the optimal design of high voltage bushing electrodes in transformers is investigated. The convergence of calculation and the evolution principles are specially developed and some measures to accelerate the speed of the strategy are pointed out. The electrode of the bushing can be made in many different ways, in which all of them have the same outline s... View full abstract»

• ### Application of steepest descent smoothing and de-meshing techniques in h-version adaptive FEMs

Publication Year: 1999, Page(s):1346 - 1349
Cited by:  Papers (4)
| | PDF (344 KB)

This paper describes the application of combining steepest descent smoothing, swappings and de-meshing techniques to bound the worst mesh quality in the h-version adaptive mesh refinement process. Numerical results include a microstrip patch antenna and a microstrip meander line and show the the effectiveness of the current approach View full abstract»

• ### A non-linear circuit model of hysteresis

Publication Year: 1999, Page(s):1247 - 1250
Cited by:  Papers (8)
| | PDF (332 KB)

A nonlinear circuit model of hysteretic phenomena is presented. The model provides a close prediction of static hysteresis and exhibits realistic dynamic features. The parameters of the circuit model can be identified by a proper identification procedure, based on a representation theorem. Basic features are addressed and discussed. Finally, both numerical comparisons with other models proposed in... View full abstract»

• ### Shape optimization of magnetic devices using genetic algorithms with dynamically adjustable parameters

Publication Year: 1999, Page(s):1686 - 1689
Cited by:  Papers (5)
| | PDF (480 KB)

An improved method for the inverse shape optimization of magnetic devices using genetic algorithms (GAs) with dynamically adjustable parameters is presented. The proposed method starts from an initial population using large number of bits per chromosome enabling searching for the optimal solution in a wider region without aggravating the computational speed. Later, as the optimization process evol... View full abstract»

• ### A new posteriori error estimation concept for three-dimensional finite element solution

Publication Year: 1999, Page(s):1446 - 1449
Cited by:  Papers (1)
| | PDF (284 KB)

The three-dimensional finite element method (FEM) has been widely applied for the practical analysis of electromagnetic fields. However, numerical error estimation methods which focus on the governing equations of electromagnetic fields, not FEM formulations, have been reported in few papers. This paper proposes a new posteriori error estimation concept based on Ampere's circuital law which is one... View full abstract»

• ### Continuum shape design sensitivity analysis of magnetostatic field using finite element method

Publication Year: 1999, Page(s):1159 - 1162
Cited by:  Papers (5)
| | PDF (268 KB)

A shape design sensitivity analysis for the magnetostatic field is developed using the finite element method. The design sensitivity expressions are analytically derived using the continuum approach, the domain integration method, and the adjoint variable method. A computer program, MAGSEN is developed using object orient programming and validated by applying it to the shape optimization of 8-pole... View full abstract»

• ### Concentrated anisotropic magnetization for high sensitivity of optical pickup actuator

Publication Year: 1999, Page(s):1861 - 1864
Cited by:  Papers (9)
| | PDF (376 KB)

To improve the driving sensitivity of an optical pickup actuator for high density and high speed, we present a new magnetizing method-concentrated anisotropic magnetization for Nd-Fe-B sintered magnets. The electromagnetic field analysis applying 3-D FEM was performed and several samples were actually tested. From comparing simulated data with experimental results, we verified the accuracy of the ... View full abstract»

• ### An optimal edge based finite difference solution to the vector Helmholtz equation in two dimensions

Publication Year: 1999, Page(s):1462 - 1465
| | PDF (312 KB)

In this paper, the authors investigate an edge-based finite difference method based on the reduced dispersion finite difference method. In this method, an arbitrary stencil can be used to obtain a finite difference equation where optimal coefficients are derived for a plane wave propagating through a homogeneous region, in the presence of material discontinuities and also for an anisotropic absorb... View full abstract»

• ### Refinement strategies and approximation errors for tetrahedral elements

Publication Year: 1999, Page(s):1342 - 1345
Cited by:  Papers (3)
| | PDF (336 KB)

Two tetrahedral mesh refinement algorithms proposed by Zhang are compared using the new singular value criterion for the element edge shape matrix. The short-edge subdivision' scheme is better than labeled edge subdivision'. Validity of the singular value criterion is confirmed and its geometric implications are investigated View full abstract»

• ### Analysis of the mechanical stresses on a squirrel cage induction motor by the finite element method

Publication Year: 1999, Page(s):1282 - 1285
Cited by:  Papers (4)  |  Patents (1)
| | PDF (292 KB)

The mechanical deformations and stresses have been analyzed by the finite element method (FEM) in 3 dimensions on the rotor bars of a small squirrel cage induction motor. We considered the magnetic forces and the centrifugal forces as sources which provoked the deformations and stresses on the rotor bars. The mechanical calculations have been performed after doing the electromagnetic finite elemen... View full abstract»

• ### On the local force computation of deformable bodies in magnetic field

Publication Year: 1999, Page(s):1650 - 1653
Cited by:  Papers (16)
| | PDF (288 KB)

In order to examine the accuracy of the nodal force method, a comparative study of the FEM solution has been performed which includes the edge element and the nodal element formulations. The treatment when the Maxwell stress tensor becomes asymmetric has also been investigated View full abstract»

• ### Finite element modeling for simulating remote field flaw detection in aircraft frame

Publication Year: 1999, Page(s):1750 - 1753
Cited by:  Papers (4)
| | PDF (384 KB)

The remote field eddy current (RFEC) technique, conventionally used for inspecting ferromagnetic pipes has been adapted for the detection of defects that are located deep in thick aluminum plates. This paper presents three dimensional (3D) numerical modeling of the RFEC flaw detection in metallic plates. In the RFEC method the pickup coils are located far apart which leads to a large volume to be ... View full abstract»

• ### Problems in practical finite element analysis using Preisach hysteresis model

Publication Year: 1999, Page(s):1243 - 1246
Cited by:  Papers (43)
| | PDF (268 KB)

An efficient method, which is called the “inverse distribution function method”, for calculating the magnetic field strength H from the flux density B through the Preisach model is developed. By using the method, H can be directly obtained without iteration from B which is calculated by the usual FEM, with the magnetic vector potential as an unknown variable. The effects of the dimensi... View full abstract»

• ### Functional derivatives and optimal discretization based refinement criteria for adaptive finite element analysis with scalar tetrahedra

Publication Year: 1999, Page(s):1326 - 1329
Cited by:  Papers (7)
| | PDF (324 KB)

Efficient functional derivative formulae suitable for optimal discretization based refinement criteria are developed for EM field 3-D adaptive finite element analysis (FEA) with scalar tetrahedra. Results for generalized scalar Poisson and Helmholtz systems are derived directly from first principles, and confirmed numerically through fundamental benchmark evaluations. Practical adaption applicatio... View full abstract»

• ### The classification of coupled field problems

Publication Year: 1999, Page(s):1618 - 1621
Cited by:  Papers (31)
| | PDF (392 KB)

The term “coupled problem” is used in many numerical approaches and applications. Various coupling mechanisms in a different context, such as field problems with electrical circuits, methods in a geometrically or physically sense, couplings in time and/or coupled methods to solve a field problem, are meant by this term. For a proper classification of these problems and related solution... View full abstract»

• ### An evolutive software environment for teaching the finite element method in electromagnetism

Publication Year: 1999, Page(s):1682 - 1685
Cited by:  Papers (8)
| | PDF (452 KB)

A software environment for the treatment of discrete problems is presented and used for teaching the finite element method in electromagnetism. It makes use of a user-friendly data structure which gives students a great freedom in testing, in an evolutive way, various numerical techniques on practical problems, thanks to a total control on all the components of the modeling process. In this way, t... View full abstract»

## 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.

Full Aims & Scope

## Meet Our Editors

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