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Finite Element Analysis of Electromagnetic Interference of Inner Structures of Twin-Type Relay

Yang Wenying Zhou Xue Zhai Guofu (Harbin Institute of Technology Harbin 150001 China)  
Research on electromagnetic compatibility of function module composed of two independent electromagnetic relays in a hermetically sealed shell is the foundation of technology for integration and miniaturization of electronic equipment in the future. In this paper, a 3-D finite element model is founded for three typical structures of the twin-type electromagnetic relay. The changes of the static and dynamic characteristics of relay caused by magnetic interference for different structures are analyzed quantitatively. The electromagnetic interference between two relays is analyzed from static electromagnetic torque, dynamic response time and interference torque for three working states of relays in three structures respectively. Simulation results of the dynamic characteristics of relay agree well with the measured results. The conclusion is valuable for the optimum design of the twin-type electromagnetic relay and it is also the foundation of researches on the electromagnetic interference (EMI) among several electromagnetic relays.
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