Edge effect of air gap based on Ansys Maxwell The impact on inductance parameters

Abstract: Given the significant impact of air gap on the electrical parameters of high-frequency magnetic components, this paper establishes an inductor  model for Boost circuits and uses Ansys Maxwell finite element analysis to  study the effects of air gap length and arrangement on inductance and magnetic field strength distribution. The results show that adding appropriate air  gaps to the magnetic core can reduce its magnetic density, enhance its anti  saturation ability, and reduce its inductance. By comparing magnetic core  models with different open air gap structures, it is possible to choose  magnetic core structures with open air gaps at the bottom of the middle and  side pillars for Boost inductor design, but it needs to be evaluated and  determined based on actual testing. Keywords: Boost circuit; Inductance; Transient field

 Figure 1 Inductance with air gap

 Figure 2 Inductive core structure

The air gap is located in the EI type magnetic core of the side pillar     The air gap is located in the EE type magnetic core of the side pillar

The air gap is located in the middle, and the EI type magnetic core with side pillars   The air gap is located in the middle, and the EE type magnetic core with side pillars    

                     Figure 3: Inductor Structure with Different Open Gap Magnetic Cores                                                         

Figure 4 Simulation results of magnetic flux density of magnetic core

Figure 5 Magnetic flux vector diagram of magnetic core