Motion of Break Arcs Driven by External Magnetic Field in a DC42 V Resistive Circuit

Junya SEKIKAWA  Takayoshi KUBONO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.8   pp.1255-1260
Publication Date: 2008/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.8.1255
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices(Selected Papers from IS-EMD2007))
Category: Arc Discharge & Related Phenomena
Keyword: 
arc discharge,  break arc,  high-speed camera,  magnet,  electrical contact,  

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Summary: 
Motion of break arcs driven by external magnetic field is observed using a high-speed camera. The magnetic field is applied with a permanent magnet. Experimental circuit is DC42 V-10 A resistive circuit. Material of electrical contacts is silver. Following results are shown. The break arcs are driven in the direction according to Lorentz force. The arc duration decreases with decrease of the distance between the electrical contacts and the magnet. When the external magnetic-flux density at the position of the break arc is lower than a certain value, the effect of the magnetic field to drive the break arc becomes ineffective to shorten the arc duration. The result is explained with a relationship between the motion of break arc and the distribution of the external magnetic field.