DocumentCode :
3439010
Title :
Numerical study on current and thermal distributions of electrical contacts by FEM
Author :
Koibuchi, Koichi ; Sawa, Koichiro
Author_Institution :
Keio Univ., Kasawaki
fYear :
2007
fDate :
16-19 Sept. 2007
Firstpage :
269
Lastpage :
274
Abstract :
Accurate determinations of contact resistance (which contains constriction and film resistance) and temperature rise are most conventional and important issues of electric conduction devices. This paper investigates coupled analysis of current and thermal distributions of Ag electrode by FEM. Intended final results are to obtain constriction resistance and temperature values. Contact areas (a-spot) of spherical and flat shaped Ag electrodes are discretized to a large number of narrow finite elements. Firstly, current density distributions in each element are calculated by FEM, and contact resistance values are obtained from the impressed current and electric potential difference between the anode and cathode. Compared with the theoretical results by R. Holm´s equation for constriction resistance, calculated contact resistance values of several a-spot radii show fine agreement. Local Joule heat distributions are also obtained. Moreover, thermal distributions in the electrodes are shown as the calculated results. As a quantitative verification, tendency of maximum temperature of the calculated results shows good agreement with phi-thetas theory by R. Holm.
Keywords :
contact resistance; current density; current distribution; electrical contacts; finite element analysis; temperature distribution; Ag electrode; constriction resistance; contact areas; contact resistance; coupled analysis; current density distribution; electric conduction devices; electrical contacts; film resistance; finite element method; local Joule heat distributions; thermal distribution; Anodes; Cathodes; Conductive films; Contact resistance; Current density; Electric potential; Electric resistance; Electrodes; Finite element methods; Temperature;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical contacts - 2007, the 53rd ieee holm conference on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
1-4244-0837-7
Type :
conf
DOI :
10.1109/HOLM.2007.4318228
Filename :
4318228
Link To Document :
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