• Citations Per Year
Learn More
Despite worldwide efforts and many recent advances, electrical machine modeling using finite elements can be computationally very expensive, especially if three-dimensional models are required. This contribution is concerned with speeding up the process. Some examples of line start permanent magnet machines and induction motors are provided.
We propose a finite-element scheme which involves the use of the Lagrangian interface technique to model electromagnetic signal propagation in mixed regions of very low and high conductivity. The method has relevance to modeling underground communications in oil or gas wells. There will be a significant jump in electrical conductivity especially at the(More)
Executive summary Neutrino oscillations, for which there is now compelling evidence, indicate that neutrinos are massive and that the Standard Model is incomplete. The small, but non-zero, neutrino mass may have astrophysical consequences. Furthermore, CP violation in the lepton sector may underpin the mechanism by which antimatter was removed from the(More)
This paper describes a three-dimensional (3-D) overlapping finite-element scheme for modeling movement in electromagnetic devices, which results in a continuously changing air gap. The method uses separate finite-element meshes to model the individual parts of the device. These meshes are coupled together electromagnetically on an interface using the(More)
The action of many electrical machines is based on magnetic forces in salient structures. Examples are switched reluctance machines, magnetic bearings etc. The force production behaviour of many of these machines can be approximately described using analytic methods, based for example on simple magnetic circuits and the principal of virtual work. These(More)
Over erasure, charge gain in the low Vt state, and charge loss in the high Vt state are found to be the most severe reliability issues in a localized trapping storage flash memory cell. In this paper, based on our understanding of physical mechanisms, we demonstrate that by adding vertical electrical field treatments during program/erase operations, the(More)
  • 1