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Toroidal Contact Model: Computational Results

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The classical computational model assumes touching of the contact members by a perfectly conducting small sphere that constricts the current flow, giving rise to a repulsive electrodynamical force. Accepting more contact spots (usually each spot is considered with its own sphere) and a superposing of effects is done without allowing for the reciprocal influences of these spots. However, it can image a greater touching zone than that with a spot alone, such as a circular toroidal one, having the same cross-section radius as the classical model small sphere has. Starting from the relationships deduced in the author's earlier articles, the computed variations of current density from constriction zones of the toroidal model against the distances from the symmetry axis, and from the contact surface, are presented here as representative diagrams. The dependency diagrams of the electrodynamical forces for such a configuration, on the relative values of the contact members and of the toroid dimensions are presented too, point out the appearance of attractive forces between contacts.

Rounding the two introductory works for the toroidal contact model, this article could help find practical building solutions of contacts that avoid the opening tendency at great currents, and work out new computations for contact heating.
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Keywords: contact models; electrical contacts

Document Type: Research Article

Affiliations: Department of Power Engineering, Politehnica University of Timisoara, Romania

Publication date: 01 August 2004

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