Magnetic forces and stresses in ferromagnetic material

In this presentation, the effect of the stresses in ferromagnetic materials is described based on the Chu model formulation. Such a formulation is applied to the identification of the magnetoelastic behaviour of these magnetic materials. It is shown that a compressive stress is present in the ferromagnetic material, even if the stress tensor τ_c is zero, which, as a result, tries to shorten the magnetic flux path length and shrink the magnetic core. The effect is further illustrated on a single-phase transformer core.