Abstract Aiming at the crack problem of the epoxy material fixed for the repulsion coils after repeated use, in this paper, the cause of failure and improvement measures are discussed based on the finite element method (FEM) and experiments. The stress distribution of epoxy material is obtained by coupling the electromagnetic field and the structure field, and the reasons for the damage of epoxy material are explained. The method of using circular constraint instead of constraint in the four corners is proposed to reduce the stress. Thin epoxy sheet is added to the upper end of the coils to change the constraint position and solve the cracking problem of epoxy adhesive. Finally, two sets of prototypes are designed for current shock test and tolerance test respectively. The results of simulation and experiment show that compared with the constraint in the four corners, the stress amplitude of epoxy plate under circular constraint decreases significantly, and the stress amplitude of epoxy material can be effectively reduced by adding thin epoxy sheet over the repulsion coils. Besides that, no bending or cracking of epoxy plate occurs after 5 000 tolerance experiments.
Dong Runpeng,Zhuang Jinwu,Wu Jin等. Failure Analysis and Improvement Measures of Epoxy Material for Fixed Coil in Electromagnetic Repulsion Mechanism[J]. Transactions of China Electrotechnical Society, 2020, 35(21): 4492-4500.
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2020, Vol. 35 
