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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2008, Vol. 9 Issue (4): 577-582    DOI: 10.1631/jzus.A0720004
Electrical & Electronic Engineering     
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
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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)     
Received: 20 September 2007     
CLC:  TM5  
  TM15  
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Guo-fu ZHAI
Qi-ya WANG
Wan-bin REN
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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. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(4): 577-582.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0720004     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2008/V9/I4/577

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