Numerical Analyses for Contact Resistance due to Constriction Effect of Current Flowing through Multi-Spot Construction

Shigeru SAWADA  Terutaka TAMAI  Yasuhiro HATTORI  Kazuo IIDA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.6   pp.905-911
Publication Date: 2010/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.905
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electromechanical Devices and Components
Keyword: 
constriction resistance,  electrical contact,  numerical analysis,  real contact area,  

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Summary: 
Constriction resistance is calculated by numerical analysis using Laplace's equations for electric potential of steady state in many cases of contact spot dispersion-status. The results show that contact resistance does not increase beyond 1.5 times even if the total real contact area is about 15% of the apparent contact area. When real contact area is at least about 60% of the apparent contact area, the contact resistance is approximately the same as the constriction resistance acquired from the apparent contact area. When the real contact area is about 50% of the apparent contact area, the contact resistance is approximately constant without regard to the contact shape and contact-point dispersion layout. Therefore, it is proved that contact resistance can be practically calculated using apparent contact area instead of real contact area when there are many contact points caused by metal to metal contact.