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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.4 P.577~582

http://doi.org/10.1631/jzus.A0720004


Research on electromagnetic relay’s dynamic characteristics disturbed by uniform static magnetic field


Author(s):  Guo-fu ZHAI, Qi-ya WANG, Wan-bin REN

Affiliation(s):  Military Apparatus Research Institute, Harbin Institute of Technology, Harbin 150001, China

Corresponding email(s):   wqy_876@163.com

Key Words:  Dynamic characteristics, Uniform static magnetic field, Electromagnetic relay, Finite element method (FEM), Electromagnetic compatibility (EMC)


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Guo-fu ZHAI, Qi-ya WANG, Wan-bin REN. Research on electromagnetic relay’s dynamic characteristics disturbed by uniform static magnetic field[J]. Journal of Zhejiang University Science A, 2008, 9(4): 577~582.

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DOI - 10.1631/jzus.A0720004


Abstract: 
electromagnetic relay is a widely used apparatus which usually works in a magnetic disturbance environment. To evaluate its electromagnetic compatibility (EMC) in a static magnetic field, dynamic characteristics of a clapper relay in a uniform static magnetic field situation based on the finite element method (FEM) is studied. Influences of the magnetic field on dynamic parameters (delay time, pick-up time, end pressure, and final velocity) as well as a situation in which the relay cannot function normally are analyzed. Simulation reveals that the external magnetic field which weakens the relay’s air-gap field has a greater influence on the relay’s dynamic parameters than the one strengthening the field. The validity of the simulation is verified by measured results of coil current and armature displacement.

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Reference

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