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# IEEE Transactions on Magnetics

## Filter Results

Displaying Results 1 - 25 of 38
• ### [Front cover]

Publication Year: 2008, Page(s): C1
| PDF (168 KB)

Publication Year: 2008, Page(s):4565 - 4566
| PDF (66 KB)
• ### Centimeter- and Millimeter-Wave Attenuation Properties of Carbonyl Iron Fiber-Filled Foam Composites

Publication Year: 2008, Page(s):4567 - 4570
Cited by:  Papers (3)
| | PDF (902 KB) | HTML

We have formulated carbonyl iron fiber-filled foam composites and measured their complex permittivity and permeability at x-band (8.2-12.4 GHz) by the transmission and reflection waveguide method. The results show that carbonyl iron fiber with smaller diameter and higher aspect ratio exhibits higher complex permittivity and permeability. The reflection loss measurement shows that lightweight carbo... View full abstract»

• ### Microstructural, Magnetic and Microwave Properties of Large Area BaFe$_{12}$O$_{19}$ Thick Films ($>!100 mu$m) Deposited on /a-SiO$_{2}$ /Si and /a-Al$_{2}$ O$_{3}$ /Si Substrates

Publication Year: 2008, Page(s):4571 - 4577
Cited by:  Papers (4)
| | PDF (1315 KB) | HTML

We have demonstrated the feasibility of thick BaFe12O19 ceramic films fabricated on silicon (100) substrates. We obtained large area (1-in diameter) thick films (100-200 mum) by using a screen printing technique and amorphous SiO2 or Al2O3 buffer layers. To characterize the microstructural, magnetic, and microwave properties of ferrite films, ... View full abstract»

• ### Structural and Magnetic Properties of ${hbox{TbCu}}_{7}$ -type ${hbox{SmCo}}_{7-x}{hbox{Ni}}_{x}$ Magnets Produced by Mechanical Milling

Publication Year: 2008, Page(s):4578 - 4581
Cited by:  Papers (3)
| | PDF (342 KB) | HTML

We have prepared nanograin magnetic powders of SmCo7-xNix (x =0, 0.2, 0.3, 0.4, 0.5, 0.6, 1.0, 1.5, 2.0) alloys by ball milling followed by annealing at 700degC for 2 h. Samples with x=0 -1.0 show a single TbCu7-type phase (1:7) structure, and the lattice parameters a and c of this structure decrease as the Ni content increases. The Curie temperature (Tc... View full abstract»

• ### Least Squares Magnetic-Field Optimization for Portable Nuclear Magnetic Resonance Magnet Design

Publication Year: 2008, Page(s):4582 - 4590
Cited by:  Papers (7)  |  Patents (1)
| | PDF (1101 KB) | HTML

Single-sided and mobile nuclear magnetic resonance (NMR) sensors have the advantages of portability, low cost, and low power consumption compared to conventional high-field NMR and magnetic resonance imaging (MRI) systems. We present fast, flexible, and easy-to-implement target field algorithms for mobile NMR and MRI magnet design. The optimization finds a global optimum in a cost function that mi... View full abstract»

• ### A Coreless Axial-Flux Permanent-Magnet Generator for Automotive Applications

Publication Year: 2008, Page(s):4591 - 4598
Cited by:  Papers (38)
| | PDF (1280 KB) | HTML

We present a modified structure of an axial flux permanent magnet generator for an automotive application. The generator has a coreless double-stator structure; one is stationary, and the other can be moved to achieve the desired performance. This provides a simple mechanical way to weaken flux in order to extend the speed range of the generator for a constant output power. The excitation is from ... View full abstract»

• ### Analytical Modeling Approach to Detect Magnet Defects in Permanent-Magnet Brushless Motors

Publication Year: 2008, Page(s):4599 - 4604
Cited by:  Papers (21)
| | PDF (609 KB) | HTML

The paper presents a novel approach to detect magnet faults such as local demagnetization in brushless permanent-magnet motors. We have developed a new form of analytical model that solves the Laplacian/quasi-Poissonian field equations in the machine's air-gap and magnet element regions. We verified the model by using finite-element software in which demagnetization faults were simulated and elect... View full abstract»

• ### Switched Reluctance Motor Modeling, Design, Simulation, and Analysis: A Comprehensive Review

Publication Year: 2008, Page(s):4605 - 4617
Cited by:  Papers (64)
| | PDF (1782 KB) | HTML

Switched reluctance machines have emerged as an important technology in industrial automation; they represent a real alternative to conventional variable speed drives in many applications. This paper reviews the technology status and trends in switched reluctance machines. It covers the various aspects of modeling, design, simulation, analysis, and control. Finally, it discusses the impact of swit... View full abstract»

• ### Time-Stepping Simulation of Synchronous Reluctance Motors Using a Nonlinear Reluctance Network Method

Publication Year: 2008, Page(s):4618 - 4625
Cited by:  Papers (18)
| | PDF (1392 KB) | HTML

We present a nonlinear reluctance network approach for the computation of the electromotive force (EMF) waveforms of synchronous reluctance motors (SynRM) with a massive rotor or a flux barrier rotor. We model all ferromagnetic parts of the machine by nonlinear reluctances in order to take the saturation into account. The model of the motor consists of three reluctance networks: of the stator, of ... View full abstract»

• ### Electromagnetic Forces in a Hybrid Magnetic-Bearing Switched-Reluctance Motor

Publication Year: 2008, Page(s):4626 - 4638
Cited by:  Papers (35)
| | PDF (897 KB) | HTML

We have performed analysis and experimental measurement of the electromagnetic force loads on the hybrid rotor in a novel hybrid magnetic-bearing switched-reluctance motor (MBSRM). An MBSRM has the combined characteristics of a switched-reluctance motor and a magnetic bearing. The MBSRM discussed in this paper has an eight-pole stator and a six-pole hybrid rotor, which is composed of circular and ... View full abstract»

• ### Modeling and Control of Solid-Rotor Synchronous Reluctance Machines Based on Rotor Flux Dynamics

Publication Year: 2008, Page(s):4639 - 4647
Cited by:  Papers (3)
| | PDF (391 KB) | HTML

We present a model suitable for use in a vector control algorithm for synchronous reluctance machines with solid conducting rotors. The model takes the rotor flux dynamics into consideration. It is similar to an induction machine model, yet includes a magnetic saliency of the rotor. Here, we discuss techniques for parameter extraction and suggest a modification of the model to incorporate the nonl... View full abstract»

• ### A Simple and Efficient Tool for Design Analysis of Synchronous Reluctance Motor

Publication Year: 2008, Page(s):4648 - 4652
Cited by:  Papers (12)
| | PDF (364 KB) | HTML

We present an efficient tool for design analysis of a synchronous reluctance motor (SynRM). We use winding function analysis (WFA) instead of finite-element analysis (FEA). With WFA, parameter sensitivity can be analyzed and the effects of parameters on the machine design can be evaluated very rapidly (under linear condition). We investigated the effect of rotor skewing, stator winding chording, p... View full abstract»

• ### Modeling the Static Vertical Force of the Core-Type Permanent-Magnet Planar Motor

Publication Year: 2008, Page(s):4653 - 4658
Cited by:  Papers (9)
| | PDF (241 KB) | HTML

The vertical electromagnetic force affects the design of the air bearing or magnetic bearing of a synchronous permanent-magnet planar motor (SPMPM), whereas the static vertical electromagnetic force is one of the important components of the vertical electromagnetic force. This paper discusses the problem of modeling the static vertical force of the SPMPM analytically. First, we obtain an analytica... View full abstract»

• ### Stator and Rotor Pole Combinations for Multi-Tooth Flux-Switching Permanent-Magnet Brushless AC Machines

Publication Year: 2008, Page(s):4659 - 4667
Cited by:  Papers (59)
| | PDF (1620 KB) | HTML

A simple analytical method is developed for determining the optimal combination of stator pole and rotor pole numbers for a multi-tooth flux-switching permanent magnet (FSPM) machine, and the optimal design of the stator teeth for maximum torque. In addition, the rotor pole width and the split ratio are optimized by finite element analysis. The optimized multi-tooth FSPM machine exhibits a signifi... View full abstract»

• ### Influence of Space Harmonics on Starting Performance of a Single-Phase Line Start Permanent-Magnet Motor

Publication Year: 2008, Page(s):4668 - 4672
Cited by:  Papers (8)
| | PDF (917 KB) | HTML

In this paper, we investigate the effects of space harmonics of single-phase line start permanent-magnet (LSPM) motors on starting performance. We construct an equivalent electric circuit considering the harmonics for the analysis, in which the magnetostatic field computation is coupled with finite-element modeling. We analyze the starting characteristics by circuit simulation and show that the re... View full abstract»

• ### A New Pattern for Detecting Broken Rotor Bars in Induction Motors During Start-Up

Publication Year: 2008, Page(s):4673 - 4683
Cited by:  Papers (44)
| | PDF (941 KB) | HTML

This paper introduces a novel frequency pattern for diagnosis of broken rotor bars in induction motors during the start-up period. This is important in the case of start-up of large induction motors with long starting time and also motors with frequent start-up. The amplitude of the side-band components of the introduced frequency pattern is a suitable index for diagnosing the broken bars and dete... View full abstract»

• ### Performance Characterization of Circular Silicon Transformers

Publication Year: 2008, Page(s):4684 - 4688
Cited by:  Papers (3)
| | PDF (298 KB) | HTML

We have characterized performance of on-chip circular silicon transformers. The circular transformers were fabricated by the standard 0.18 mum CMOS process. We used measured two-port S-parameters, a de-embedding procedure, and simulated S-parameters derived from a lumped-element circuit model. We examined performance indicators of transformers such as quality factor (Q), maximum available g... View full abstract»

• ### Analysis of Inherent Magnetic Position Sensors in Symmetric AC Machines for Zero or Low Speed Sensorless Drives

Publication Year: 2008, Page(s):4689 - 4696
Cited by:  Papers (15)
| | PDF (679 KB) | HTML

This paper presents an analysis of inherent position sensors in ac machines. In ac machine drives, the attachment of a mechanical transducer or a structural modification is necessary for zero or low speed operation where the back electromotive force (EMF) is zero or low. However, designs for introducing a measurable saliency in the spatial impedances of structurally symmetrical ac machines without... View full abstract»

• ### Design Coupled Inductors for Interleaved Converters Using a Three-Leg Core

Publication Year: 2008, Page(s):4697 - 4705
Cited by:  Papers (8)  |  Patents (2)
| | PDF (323 KB) | HTML

We describe a method for determining the split winding distribution for coupled inductors in interleaved converters. Our method greatly reduces the footprint and copper losses of the magnetic component. We discuss the analysis and design method for the coupled inductors in detail. We use a geometrical method to solve problems such as uneven fluxes of different legs and magnetic core selection crit... View full abstract»

• ### Characterization of Nanomagnet Fringing Fields in Hybrid Semiconductor/Ferromagnetic Devices

Publication Year: 2008, Page(s):4706 - 4710
Cited by:  Papers (2)
| | PDF (509 KB) | HTML

We describe the fabrication of a hybrid nanomagneto-electronic device, consisting of a GaAs/AlGaAs quantum wire that is bridged by a ferromagnetic gate, and study the influence of the nanomagnet fringing fields on the quantum-wire magneto-resistance. The nonplanar gate shows clear single-domain structure in magnetic-force microscopy, and a simple magnetization behavior in an external magnetic fiel... View full abstract»

• ### Influence of Some Parameters on the Effectiveness of Induction Heating

Publication Year: 2008, Page(s):4711 - 4720
Cited by:  Papers (11)
| | PDF (373 KB) | HTML

We have investigated the effectiveness of heating conductive plates by induction in low frequencies analytically and numerically, in relation to the shape of the plate, the area of the region exposed to the magnetic flux, and the position of the exposed region with respect to the center of the plate. We considered both uniform and nonuniform magnetic fields. For plates with equivalent area exposed... View full abstract»

• ### 3-D Eddy-Current Imaging of Metal Tubes by Gradient-Based, Controlled Evolution of Level Sets

Publication Year: 2008, Page(s):4721 - 4729
Cited by:  Papers (3)
| | PDF (408 KB) | HTML

Eddy-current nondestructive testing is widely used to detect defects within a metal structure. It is also useful to characterize their location and shape provided that proper maps of variations of impedance that the defects induce are available. Imaging of void defects in the wall of a hollow, nonmagnetic metal tube, is performed herein by controlled evolution of level sets. Such data are variatio... View full abstract»

• ### Eddy-Current Losses in Laminated Cores and the Computation of an Equivalent Conductivity

Publication Year: 2008, Page(s):4730 - 4738
Cited by:  Papers (20)
| | PDF (1064 KB) | HTML

This paper deals with the computation of eddy-current losses in laminated cores. In the first part we recall some approximate formulas existing in the literature and implemented in many electromagnetic computer packages. Then we assess their accuracy by making comparisons with the exact loss values obtained by numerical solution of the quasi-static Maxwell equations. In the second part we introduc... View full abstract»

• ### Magnetic Eddy-Current and Thermal Coupled Models for the Finite-Element Behavior Analysis of Underground Power Cables

Publication Year: 2008, Page(s):4739 - 4746
Cited by:  Papers (10)
| | PDF (349 KB) | HTML

We have modeled underground isolated power cables by using magnetic eddy-current (EC) and thermal coupled formulations solved by the finite-element method (FEM). The magnetic field equation expressed in terms of magnetic vector potential (MVP) is strongly coupled with the total current density equation, which includes the source and the EC densities for taking into account skin and proximity effec... View full abstract»

## Aims & Scope

IEEE Transactions on Magnetics is a peer-reviewed, archival journal in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The journal publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.

Full Aims & Scope

## Meet Our Editors

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