Study on Electromagnetic Performance Based on Metal Magnetic Memory Testing Technology

Abstract

AbstractIn the process of wheelset safety testing by using metal magnetic memory testing technology, the magnetic field interference generated by the electric field inside the train often affects the results of metal magnetic memory testing. In order to study the quantitative relationship between electromagnetic and magnetic memory signal, this paper has studied on the electromagnetic performance of 25CrMo4 material. By loading electromagnetic on the material plate, it is analyzed the relationship between the current and magnetic memory signal. The experimental results show that the maximum value of the tangential component magnetic field intensity of the plate fluctuates between 51 A/m to 78 A/m and the minimum value fluctuates between −84 A/m to −116 A/m. The maximum value of the normal component magnetic field intensity of the plate fluctuates between 3 A/m to 20 A/m and the minimum value fluctuates between −13 A/m to 26 A/m. The average value of tangential magnetic field intensity of the plate is increasing. And its value fluctuates between −2.6 A/m to 21.8 A/m. The average value of the normal magnetic field intensity of the plate changes little. And its value fluctuates between −2.1 A/m to −4.2 A/m. The change trend of the average value of the signal modulus first increases and then decreases. When the current value is from 40 A to 80 A, the signal modulus of the plate increases. From 80 A to 200 A, the signal modulus of the plate decreases continuously. Then the electromagnetic numerical simulation curve is constructed to provide a theoretical basis for the subsequent research on the influence of traction motor magnetic field on wheel-pair magnetic signal.KeywordsMetal magnetic memory detectionElectricmagnetic performancePolynomial fitting