The microstructure of grain boundaries (GBs) in the commercial NdFeB-based alloy for permanent magnets has been studied. It is generally accepted that unique hard magnetic properties such alloys are controlled by thin layers a Nd-rich phase Nd2Fe14B/Nd2Fe14B GBs. These GB ensure isolation Nd2Fe14B grains from each other. usually supposed contain metallic Nd or intermetallic compounds. However, ...

This paper presents three dimensional study of a ferrofluid seal, its centering effect and its static capacity. Thus, a method based on a potential energy criterion has been put forward to study the seal shape. But such a use of ferrofluid seals is interesting only if the magnetic field created by the permanent magnets saturates totally the ferrofluid. Two cylindrical structures consisting of t...

The hysteresis motor is so named because it is producing mechanical torque utilizing the phenomenon of hysteresis. The rotor of a hysteresis motor is a cylindrical tube of high hysteresis loss permanent magnet material without windings or slots. This paper presents the design of a hysteresis permanent magnet motor using the finite element method. The rotor of the machine consists of 36% Cobalt ...

The paper presents electromagnetic finite element analyses for the eddy current losses in permanent magnets of synchronous machines. The main focus lies on high order element formulations and the comparison of the respective results against an analytical evaluation of these losses for both linear and rotational arrangements. Therefore, the representation of skin depth and wave length with the n...

Spherical neodymium-iron-boron magnets are permanent magnets that can be assembled into a variety of structures owing to their high magnetic strength. A one-dimensional chain of these magnets responds to mechanical loadings in a manner reminiscent of an elastic rod. We investigate the macroscopic mechanical properties of assemblies of ferromagnetic spheres by considering chains, rings and chira...

Investigation of the dq-Equivalent Model for Performance Prediction of Flux-Switching Synchronous Motors With Segmented Rotors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. Zulu, B. C. Mecrow, and M. Armstrong 2393 Modeling and Parametric Design of Permanent-Magnet AC Machines Using Computationally Efficient Finite-Element Analysis . . . . . . . . . . . . . . . . ...