Numerical Analysis and Experimental Investigation of Dynamic Behavior of AC Contactors Concerning with the Bounce of Contact

Xingwen LI  Degui CHEN  Zhipeng LI  Weixiong TONG  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.8   pp.1318-1323
Publication Date: 2004/08/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on IS-EMD2003--Recent Technical Trend of Electro-Mechanical Devices)
Category: 
Keyword: 
contactors,  finite element analysis,  magnetic circuit,  bounce,  coupled problems,  

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Summary: 
In the optimum design of AC contactors, it is necessary to analyze the dynamic behavior. Moreover, movable contacts and core bounce have remarkable effect on the lifetime of contactors. A set of differential equations describes the coupling of the electric circuit, electromagnetic field and mechanical system taking account into bounce and the influence of friction. With virtual prototyping technology, the dynamic behavior, especially for contacts bounce, has been investigated according to different electrical circuit parameters. Two approaches are introduced to solve electromagnetic parameters. Based on 3D finite element static nonlinear analysis, the flux linkage and electromagnetic force can be evaluated with different air gap and exciting current for larger gap. In addition, concerning to the shading coil for smaller gap, magnetic circuit can facilitate the calculation. The validity of the proposed method is confirmed by experiments.