Characterization of Lorentz Force Distribution in Electromagnetic Repulsion Mechanism of Multiple Parallel Circuit Breakers

In order to meet the requirements of parallel circuit breaker opening rapidity and synchronization, a new structure of electromagnetic repulsion mechanism (EMRM) is proposed in this paper. A three-dimensional transient flexible body model of the mechanism was built in COMSOL. Simulation results show that the EMRM can reach the rated opening distance of 20mm in 4.86ms, and the maximum stress during the motion is 246MPa. There is vibration in the motion process due to the uneven distribution of Lorentz force, and the vibration is periodic. The maximum stress is related to the vibration characteristics. Through theoretical derivation and simulation analysis, an analytical formula describing the relationship between the Lorentz force distribution and structural parameters is proposed in this paper. Error between the formula results and the simulation results is less than 4.5%. The analytical formula can be applied to parameter design.