Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly

2008   Vol. 9   No. 4   p. 577~582

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

Guo-fu ZHAI, Qi-ya WANG^†‡, Wan-bin REN

(Military Apparatus Research Institute, Harbin Institute of Technology, Harbin 150001, China)
^‡ Corresponding Author
^†E-mail: wqy_876@163.com
Received Sept. 20, 2007; revision accepted Dec. 14, 2007

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.

Key words: Dynamic characteristics, Uniform static magnetic field, Electromagnetic relay, Finite element method (FEM), Electromagnetic compatibility (EMC)
doi:10.1631/jzus.A0720004             CLC number: TM5; TM15

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