Estimativa do perfil do campo de excitação de um sensor fluxgate ortogonal cilíndrico operado em saturação constante

Abstract

Fluxgate is a device that directs the direction and magnitude of magnetic fields. In this work, it is estimated the excitation field profile that passes through the conductive wire responsible for the excitation of a fluxgate sensor operated in constant saturation. The stream studied has an orthogonal field of excitation. The conductive wire responsible for the excitation is composed of Copper and the ferromagnetic core of the sensor is composed of Nickel-Iron. From Maxwell’s equations for quasi-static fields determine as equations of the electric and analytical field, however, these equations are only for a region of Copper and an electric current when it is used by Nickel-Iron. To solve this problem it uses the numerical integration method to determine the profile of the excitation field in Copper and Nickel-Iron. With this, it was possible to compare numerical and analytical data for Copper and obtain a valid numerical solution for Nickel-Iron. A magnetic permeability of the material interferes in the field profile, on the other hand, obtaining curves for different permeability values. The consultation was done between numerical and analytical data for the Calculation of validated data for Nickel-Iron. The key that shows the behavior of the current in the two regions was reported as an electric field within the material. Measurements of the excitation field were also performed for varying permeability values, showing permeabilities above 1000 which affect the concentration of energy in the Iron region, severely damaging the excitation of the central part of this region.