The characteristics of time-varying magnetic fields during the demagnetization process of complex ferromagnetic cavity structures were studied based on computational electromagnetic sim-ulation.By establishing a simulation model of the complex ferromagnetic cavity structure and the magnetic field generation coil,the main factors affecting the characteristics of time-varying mag-netic fields were analyzed and explained,including eddy current effects,hysteresis effects,material properties of the complex ferromagnetic cavity structure,and structural gap connections.The magnetic field amplitude at typical locations was investigated,and the temporal variation of the internal magnetic field was analyzed.Additionally,the evolution motion of eddy currents dur-ing the dynamic demagnetization process was simulated.It was found that the aforementioned fac-tors significantly affect the internal magnetic field of the complex ferromagnetic cavity structure during the demagnetization process,and their influences intertwine,resulting in complex time-var-ying characteristics.Through theoretical analysis and numerical simulation,the mechanisms and rules of these influences were revealed.The research findings provide important references for op-timizing the demagnetization process,improving demagnetization effectiveness,and developing e-quipment-level magnetic field protection criteria and design.
关键词
铁磁性腔体/退磁/涡流效应/磁滞效应/磁场分布
Key words
Ferromagnetic cavity/Demagnetization/Eddy current effect/Hysteresis effect/Mag-netic field distribution
维普
万方数据