Increase of lifetime of electromagnetically actuated contactors by avoiding self-synchronization

Author

Griepentrog, Gerd ; Kalvelage, Frank ; Elsner, Norbert ; Mitlmeier, Norbert

Author_Institution

Siemens AG, Erlangen, Germany

fYear

2004

fDate

20-23 Sept. 2004

Firstpage

408

Lastpage

415

Abstract

This work deals with the unequal contact erosion frequently observed in electromagnetically controlled three-phase contactors. This effect of uneven erosion is caused by the non-uniform distribution of the switching angles, due to the synchronization between the electromagnetic drive and the three load contacts and is referred to as self-synchronization. This is initially investigated and analyzed by the means of a specially conceived test rig whereby both make and break operation have been considered. The main focus of This work is on the here-specified self-synchronization, which occurs due to interaction of the armature system of the contactor and the three-phase system. Following the analysis, advice is given as to how synchronization can be avoided and thus lifetime of the contactor can be significantly extended.

Keywords

contactors; electric drives; electromagnetic actuators; load (electric); synchronisation; armature system; circuit break operation; contact erosion; electromagnetic actuated contactor lifetime; electromagnetic drives; load contacts; nonuniform switching angle distribution; self synchronization; test rig; three phase contactor system; Contactors; Contacts; Control systems; Drives; Feedback; Friction; Springs; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Contacts, 2004. Proceedings of the 50th IEEE Holm Conference on Electrical Contacts and the 22nd International Conference on Electrical Contacts

Print_ISBN

0-7803-8460-1

Type

conf

DOI

10.1109/HOLM.2004.1353149

Filename

1353149