Study On Magnetic Field Gathering Directional Microstructure

With the continuous development of human probeing space resources, the researchers put forward higher requirements of the magnetic sensor. However, the carrier detection and exploitation of resources requires a magnetic sensor with small, good vector and high accuracy. There are no magnetic vector sensors that can satisfy such conditions at present. Therefore, the paper presents the basis of existing magnetic sensor coupled to the outer flux concentrators structure, which can improve the accuracy of the magnetic vector sensor.The main design principle of magnetic flux concentrators structure was put forward after the theory of the magnetic flux concentrators was studied in the paper. Two-dimensional and three-dimensional structures of different shapes of the flux concentrators were analysised by ANSYS finite element software. Amplification factor to the external magnetic field of T-shaped flux concentrators was largest after analyzed. Amplification factors to the external magnetic field of two-dimensional and three-dimensional structures were 5.6 times and 22.5 times, respectively. Then for the factors influencing the magnetic flux concentrators gather is analyzed, respectively, obtain material permeability,length and width ratio,inside and outside width ratio,inside and outside length ratio proportional to the amplification factor of the the external magnetic field is logarithmic, nonlinear, linear, nonlinear relationship, and proportional to the length of the structure gap is a reciprocal relationship.Then, selective vector and magnetic field distribution of the T-shaped flux concentrators was analysed.The macroscopic and microscopic structure of the flux concentrators were prepared based on ansys simulation theory and then tested including magnetization characteristics of flux concentrators material, amplification characteristics, axial magnetic field amplification factors, linear operating range of axial magnetic field and the selective magnetic field vector. In three different shapes of the flux concentrators, T-shaped flux concentrators amplify the magnetic field best that amplify the external magnetic field 21.8 times with the smallest linear operating range. Magnetic flux concentrators lines flowed from end to end flow generated during the magnetic flux leakage generated. The larger the aspect ratio of the magnetic flux is concentrated structure and the greater smaller the gap width of the structure of the magnification of the magnetic field, the better of the structure of the amplification characteristics of the external magnetic field, while the thickness of the structure has little influence. The magnetic flux gathering structure has a good vector selectivity.The research will provide some reference value for the design and optimization of magnetic flux concentrators structures.