DocumentCode :
3517113
Title :
Effects of Rotational Motion of Break Arcs on Arc Duration and Contact Erosion
Author :
Sekikawa, Junya ; Kubono, Takayoshi
Author_Institution :
Fac. of Eng., Shizuoka Univ., Hamamatsu, Japan
fYear :
2011
fDate :
11-14 Sept. 2011
Firstpage :
1
Lastpage :
6
Abstract :
An electrical rivet contact in which a column-shaped permanent magnet is embedded in the rivet shank beneath the contact head is mounted on a relay as the stationary contact. The moving contact is a conventional rivet without the magnet. The magnet forms radial magnetic field to rotate break arcs around the center axis of electrical contacts. A series of switching experiments are carried out in a 42VDC resistive circuit at currents of 7A, 10A and 14A. The contact material is Ag/SnO2 12wt%. Experimental results for break-only operations with the magnet are compared with those without the magnet. Effects of rotational motion of break arcs driven by the magnet are investigated for the contact erosion and arc duration. Without the magnet, the area of contact erosion on the contact surfaces is concentrated on the tip of contacts. With the magnet, on the other hand, the area of contact erosion is widespread on contact surfaces by the rotational motion of break arcs. The effect of the magnet is confirmed to result in a uniform contact erosion area. The arc duration is also shortened and found to be effective for larger circuit current.
Keywords :
arcs (electric); contact resistance; electrical contacts; permanent magnets; riveting; arc duration; break arcs; column-shaped permanent magnet; contact erosion; electrical contacts; electrical rivet contact; radial magnetic field; rotational motion; Contacts; Magnetic circuits; Magnetic flux; Magnetic resonance imaging; Magnetic separation; Relays; Surface topography;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Contacts (Holm), 2011 IEEE 57th Holm Conference on
Conference_Location :
Minneapolis, MN
ISSN :
1062-6808
Print_ISBN :
978-1-61284-650-7
Type :
conf
DOI :
10.1109/HOLM.2011.6034808
Filename :
6034808
Link To Document :
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