Journal Archives - IEEE Transactions on Magnetics

Effect of Manufacturing Influences on Magnetic Performance Parameters of Sub-Fractional Horsepower Motors

October 1, 2021Stefan Leitner, Hannes Gruebler and Annette MuetzeJournalForging, Lamination, Laser beam cutting, Magnetic hysteresis, Permanent magnet motors, Torque, Torque measurement

Depending on the stator lamination manufacturing processes (e.g., punching, laser cutting, clamping, welding, interlocking, and bonding), the motor’s magnetic performance parameters, such as cogging torque, hysteresis torque, and iron losses, can vary significantly. In sub-fractional horsepower (SFHP) permanent magnet motors, the manufacturing influence is typically even more severe because, due to their small dimensions, practically, […]

Angular Remanence and Anisotropy Orientation Distribution in Nickel Films on LiNbO3

September 1, 2021Scott A. Mathews, Olaf M. J. van‘t Erve, Mehmet A. Noyan and Nicholas A. ChariparJournalAnisotropic magnetoresistance, Magnetic domains, Magnetic field measurement, Perpendicular magnetic anisotropy, Remanence, Saturation magnetization, Temperature measurement

Nickel thin films (100 nm) deposited on 128∘Y -cut: LiNbO 3 exhibits a well-defined, uniaxial, magnetic anisotropy after annealing at 325 °C. Simulating the magnetization of these films using a temperature-dependent Stoner–Wohlfarth (SW) model indicates that the films have a very narrow angular distribution of anisotropy axis orientations. Here, we report a direct measurement of the angular distribution of […]

Effective Medium Transformation: The Case of Eddy Currents in Laminated Iron Cores

September 1, 2021Markus Schöbinger, Igor Tsukerman and Karl HollausJournalEddy currents, Geometry, Iron, Magnetic cores, Magnetostatics, Mathematical model, Permeability

Effective medium theory replaces a given fine-scale heterostructure with a homogeneous one in such a way that the physically measurable quantities, e.g., reaction fields and losses, remain approximately the same. This article presents a peculiar case where the physical nature of the problem and the type of governing mathematical equations change upon homogenization. We consider […]

Optimum Coil-System Layout for Magnet-Driven Superconducting Magnetic Density Separation

May 1, 2021J. J. Kosse, M. Dhallé, G. Tomás, P. C. Rem, H. J. M. ter Brake, H. H. J. ten KateJournalCoils, Feeds, Layout, Legged locomotion, Magnetic separation, Saturation magnetization, Superconducting magnets

This article discusses the optimum layout of coils of a superconducting magnet system for magnetic density separation (MDS). MDS is a novel separation technology that combines a vertical magnetic field gradient with a ferrofluid to separate mixtures of non-magnetic particles based on their mass density. The MDS process can separate more than two types of […]

Fundamental Electromagnetic Configuration for Generating One-Directional Magnetic Field Gradients

May 1, 2021J. J. Kosse, M. Dhallé, P. C. Rem, H. J. M. ter Brake, H. H. J. ten KateJournalFeeds, Magnetic analysis, Magnetic moments, Magnetic separation, Saturation magnetization, Superconducting magnets, Windings

In this article, electromagnet layouts are presented, which generate a magnetic field with a magnitude gradient that does not vary significantly in a horizontal plane but decreases monotonically with the vertical height above the magnet. Such a one-direction magnetic field gradient is a specific requirement for magnetic density separation (MDS), a novel recycling technology that […]

An Equilibrated Error Estimator for the Multiscale Finite Element Method of a 2-D Eddy Current Problem

March 1, 2021Markus Schöbinger, Joachim Schöberl, Karl HollausJournalEddy currents, Finite element analysis, Iron, Mathematical model, Measurement uncertainty, Permeability, Upper bound

The multiscale finite element method (MSFEM) is a valuable tool to solve the eddy current problem in laminated materials consisting of many iron sheets, which would be prohibitively expensive to resolve in a finite element mesh. It allows using a coarse mesh that does not resolve each sheet and constructs the local fields using predefined […]

Impact of Parameters Variability on the Level of Human Exposure Due to Inductive Power Transfer

February 1, 2021Paul Lagouanelle, Oriano Bottauscio, Lionel Pichon, Mauro ZuccaJournalCoils, Computational modeling, Finite element analysis, Numerical models, Sensitivity analysis, Solid modeling, Three-dimensional displays

This article shows the effectiveness of combining non-intrusive stochastic techniques with 3-D modeling tools to build adequate surrogate models for the evaluation of human exposure close to a vehicle equipped with a wireless charging pad. A surrogate model is appropriate to deal with uncertainties and variabilities of parameters defining the electromagnetic problem. Numerical results obtained […]