The Design And Research Of The Pressure Sensor Based On The Inverse Magnetostrictive Effect

Gaint Magnetostrictive Material(GMM)is used in high-tech fields with many characteristics.As a modern frontier scientific field,the sensor field plays an important role in both the automatic control field and the automatic detection field.The combination of gaint magnetostrictive materials and sensor technology has always been a research topic at home and abroad.The Villari mechanism is an important feature of GMM,which can be designed as an inverse magnetostrictive pressure sensor.Compared with traditional pressure sensors,inverse magnetostrictive pressure sensors have the advantages of strong overload capacity,good anti-interference ability,and suitable for harsh environments.Therefore,based on the GMM reverse effect mechanism and combined with the GMM pressure sensor's magnetic leakage problem,this paper designs a closed magnetic circuit device.In this structure,the concept of an inverse magnetostrictive pressure sensor is basically proposed.The main contents of the paper are as follows:(1)Based on the inverse effect mechanism of GMM and the insufficiency of existing giant magnetic sensors,a closed magnetic circuit device is designed,and on this basis,a design scheme for inverse magnetostrictive pressure sensors is proposed.Through the introduction of the Villari effect,a bias magnetic field is introduced,on this basis,the theoretical calculation of the bias coil parameters is carried out,and it is verified that the optimal bias current I=2.4A in the simulation study in Chapter 4 is relatively reasonable.Moreover,related structures are designed,including GMM rods,closed magnetic circuit devices,measuring devices,etc,and their functions and uses are introduced and suitable materials are selected.(2)Magnetic circuit analysis and structural optimization of the inverse magnetostrictive pressure sensor.First of all,a finite element simulation study is carried out on the closed magnetic circuit structure,and the rationality of its structure is obtained.Then,the length of the permeable magnet,the thickness of the circular flux yoke,and the length of the bias coil in the closed magnetic circuit structure are optimized separately.In the optimization process,the magnetic flux density non-uniformity ? is introduced as a measurement standard.Finally,through the orthogonal test,it is concluded that the length of the bias coil has the greatest influence on the magnetic flux density unevenness ?,while the thickness of the round flux yoke has the least influence on the test result ?.And according to the test results,the best combination plan is obtained.(3)Theoretical model and simulation study of inverse magnetostrictive pressure sensor.Firstly,a theoretical model of the sensor is established based on the characteristics of the inverse magnetostrictive pressure sensor,then,the COMSOL Multiphysics software was used to simulate the preloading force and bias current to obtain the magnetization distribution cloud map inside the GMM rod with different bias current at constant pressure,the magnetization distribution cloud map inside the GMM rod with different pressure at constant bias current,the best preloading force and the best bias current,respectively.On this basis,the simulated data are processed uniformly,the processed data are fitted,and finally the sensitivity and other static characteristics of the sensor are studied.Figure[38]Table[12]Reference[76]...