Magnetoelastic sensors calculation with a complex stress of state in the magnetic circuit

Abstract

The article considers a method for calculating magnetoelastic sensors, in which the magnetic permeability of the magnetic circuit material is a tensor, the increments of its components being proportional to the components of the mechanical stress tensor. The dependence between the components of stress tensors and the magnetic permeability increments is linear and it is described by the two parameters of magnetoelastic sensitivity which are determined experimentally for a specific material, using a special technique. The increment of induction at the point of the magnetic circuit is proportional to both the increment of the magnetic permeability tensor components and the increment of the magnetic field stress due to its redistribution between the magnetic circuit sections. Approximation of the sensor’s magnetic circuit by the equivalent circuits with the lumped parameters sections has been used. Examples of using the technique for calculating various types of magnetoelastic sensors are given.