Abstract
The design principle of the magnetic flux concentrators (MFCs) is studied by finite element method (FEM) and experiment. Firstly, the establishment process of the FEM model in Comsol Multiphysics is elaborated. Based on the simulation model, the magnetic amplification distributions of different shaped MFCs is compared, and the shape design principle of the MFC is obtained. Then, the influence of size parameters on the magnetic amplification of T, triangle, and trapezoid shaped MFCs is analyzed, and the size design principle of the MFCs is obtained. Additionally, the linear working range of the three MFCs is compared. To verify the simulation results, the MFCs are prepared using 1j79 permalloy. The experimental platform is established to acquire the magnetic gain under different magnetic fields. Based on the results, the linear working range of the MFCs is analyzed. And the influence of size parameters on the magnetic gain is tested. The experimental results are compared with the simulation ones to verify the validity of the model.
Highlights
Magnetic flux concentrator is made of magnetic material with high permeability
Finite element method is commonly used to acquire the magnetic gain of the magnetic flux concentrators (MFCs) for that the demagnetization factor for all except the simple geometries is difficult to be solved out using the analytic method.[17,18,19,20]
In conclusion, we investigates the design principle of the MFCs by finite element method and experiment
Summary
Magnetic flux concentrator is made of magnetic material with high permeability It has the effect of guiding and converging magnetic flux lines and makes the external magnetic field amplified. The design principle of the MFC made of soft magnetic material is investigated by finite element simulation and experiment. In terms of the simulation analysis, magnetic amplification distribution of different shaped MFCs under the same geometry ratio is firstly compared using Comsol Multiphysics to obtain the shape design principle. To verify the simulation results, different shaped MFCs are prepared using permalloy strips and an experimental platform is established to test the dependence of the magnetic gain on the magnetic field intensities and size parameters.
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