Towards increased speed computations in 3D moving eddy current finite element modelling

Journal Article · Wed Nov 01 04:00:00 EST 1995 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.489557· OSTI ID:186917

Allen, N; Rodger, D; Coles, P C; Street, S; Leonard, P J ^[1]

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1. Univ. of Bath (United Kingdom)

Attractive and drag forces on such devices as magnetically levitated (MAGLEV) vehicles and magnetic bearings are crucially dependent on induced eddy currents. Here, a finite element scheme used to model eddy current problems with motional velocity is described here. The formulation is a variation on the A {minus} {psi} method. An additional Minkowski-transformation term is required to take into account the velocity. However, computational instability arises when the velocity increases to the point that the first order velocity terms severely dominate the second order diffusion terms. The method presented here uses upwinding to help regain stability. An additional degree of stability is inserted at higher speeds by using a lower speed result as an initial vector. This leads to a reduced permeability in saturated regions which counter-balances to some extent the increase in velocity. The method is validated by experimental measurement.

• OSTI ID: 186917
• Report Number(s): CONF-950404--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 6Pt2 Vol. 31; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
33 ADVANCED PROPULSION SYSTEMS
42 ENGINEERING
EDDY CURRENTS
FINITE ELEMENT METHOD
LEVITATED TRAINS
MAGNETIC BEARINGS
MATHEMATICAL MODELS
THREE-DIMENSIONAL CALCULATIONS
VALIDATION