The electromagnetic repulsion mechanism（ERM） based on the principle of eddy current repulsion has been widely applied in DC circuit breakers

but its energy conversion efficiency is low. In order to design a high-efficiency ERM

we establish a simulation model of the ERM with double-coil structure by the finite element analysis method. Firstly

the effects of coil turns

height and axial turns on the dynamic characteristics of fast repulsion mechanism are simulated and analyzed

and the optimal parameters of coil disk are obtained. Then

in order to improve the driving efficiency and avoid the problems of magnetic saturation and power loss

the coil disc skeleton is analyzed and optimized from the aspects of magnetic conductive materials and structural parameters

and the optimal design parameters of the coil disc magnetic conductive components are obtained. The simulation results show that the coil is designed in 1×8 single layer type with the turns of 30 and the diameter of the coil is 200 mm. The best magnetic conductivity material is Silicon steel and the structure is E–2 type with floor thickness of 8 mm and side thickness of 10 mm. Compared with the hollow double-coil repulsive mechanism

the electromagnetic repulsion peak is increased by 20.0%

the maximum opening speed is increased by 18.1%

and the driving efficiency is increased by 41.6%

which provides a reference for the design of high-speed and high-speed and high-efficiency ERM.