The characteristics of magnetic blowing structure and motion mechanism are important factors affecting the arc breaking performance of DC contactor. In this paper

the coupling effect of non-uniform magnetic field distribution and moving contact motion characteristics in the arc extinguishing chamber is introduced. A two-dimensional arc magnetohydrodynamic simulation model with multi-field coupling of electricity

magnetism

airflow and temperature is constructed. The effects of different magnetic blowing structures

reaction spring stiffness coefficients

contact over-range and other parameters on DC arc characteristics are analyzed. An experimental platform for DC contactor arc characteristics was built

and comparative experiments were carried out to verify the simulation results. The results show that the arcing time of the two new magnetic blowing structures with intermediate permanent magnets between the static contacts is shortened by 20.2% and 14.7% respectively compared with the original structure

and the effect of increasing the intermediate permanent magnets under the electrode is better. The optimal choice of the stiffness coefficient of the reaction spring is 1.0 N/mm

and the optimal contact over-range is 1.5 mm. The experimental results are consistent with the simulation results

which provides a reference for the optimal design of improving the breaking capacity of the ceramic seal DC contactor.