Magnetic Circuit Analysis And Experimental Study Of The Magnetostrictive Characteristic Test Device

Magnetostrictive material is a kind of widely used functional materials.Its special features that make it favored magnetoelectric conversion.With the rapid development of information and technology,magnetostrictive materials in the near field communications,wireless charging,photovoltaic power generation and other new areas are widely used.With the application field of magnetostrictive materials extending,the research on the performance of magnetostrictive material is very important,which promotes the development of the testing system of the magnetostrictive properties.In this paper,a magnetic field module is designed,which is applied to the test device of the magnetostrictive characteristics,and the structure is simple and easy to operate.It has the characteristics of high sensitivity and low power consumption.This design of the applied magnetic field module can greatly improve the uniformity of the magnetic field and utilization.Firstly,the working principle and composition of the magnetostrictive characteristic test device are introduced.Then according to the design index of the magnetic field module,three possible structures of the magnetic field module are simulated.The advantages and disadvantages are analyzed.And the dual loop structure is selected as the final structure of the applied field module.The structural design of all parts of the applied magnetic field module is carried out,including the design of the electromagnetic circuit,the design of the coil,the design of the upper and lower guide magnet and the stainless steel cap.Among them,the design of the electromagnetic loop includes the choice of the magnetic yoke material and the choice of the permanent magnet material.The coil design includes the analysis of the magnetic field,the choice of the coil wire diameter and the analysis of the coil parameters.Through the above analysis,the structure of the various parts and the materials used in the process are determined.Then,the 3D modeling and finite element analysis are carried out for the structure of the applied magnetic field module.The three dimensional finite element analysis of the magnetic field module introduced: the finite element simulation of the upper and lower guide magnet and the size of the test rod,the simulation analysis of the different shape of the coil wound core,the magnetic field simulation analysis of the optimal structure and size,and the simulation analysis of the deformation of the rod under the pressure.The simulation analysis of the different shaped core includes: the simulation analysis of the cuboid structured core,the simulation analysis of the cylindrical structured core,the simulation analysis of the magnetic field when the core which is wound with coils have different shapes.The simulation analysis of the proportion of uniformly distributed magnetic field in the different shaped core.At last,theoptimal size of each part is determined.Then,on the structure of the magnetic field module 3 d modeling and finite element analysis and calculation.In the magnetic field module of 3 d finite element analysis are introduced:The finite element simulation of the upper and lower guide magnet,the finite element simulation,the simulation analysis of the different shape of the coil wound core,the magnetic field simulation analysis of the optimal structure and size,and the simulation analysis of the deformation in the pressure.Simulation analysis of different shapes of the winding core of the coil:The simulation analysis and the simulation of the magnetic field in the winding of the coil,the magnetic field of the coil,the magnetic field in the different shape of the core,and the ratio of the magnetic field in the whole test.Ultimately determine the optimal size of each part.Finally,the process and related test experiment are applied on the magnetic field module.Through the analysis and comparison of the experimental results,it is proved that the design of the applied magnetic field module has a high degree of feasibility.The work done in this paper provides a theoretical reference for the design of high performance magnetostrictive measuring device,and provides the conditions and guidance for the future research.