Effect of mechanical stress on different core loss components along orthogonal directions in electrical steels

Abstract

The paper deals with the characterisation and modeling of the mechanical stressdependency of magnetic losses along two orthogonal directions in non-oriented electrical steels. Significant anisotropy effects are highlighted. Using the three-term loss separation approach, the different loss components are computed at each stress level for a wide range of frequency. Stress dependence of the core losses can be described in terms of the hysteresis and excess loss components, classical losses being assumed to be constant as a function of stress. Variations of the model coefficients with stress along the two principal directions are discussed. Such a model can be used for computing the losses in finite element analysis of rotating electrical machines or T-joint of transformers.

Magnetic Behavior of NO Fe-Si Sheets under Tensile and Compressive Stress

“…The AC soft magnetic properties, following a similar trend with s as the quasi-static hysteresis, are generally assessed at power frequencies by invoking the loss decomposition model [7][8][9], [15]. Use of the Steinmetz's equation [3] has been proposed, as well as the adoption of an equivalent elliptical loop as the magnetic constitutive equation of the material [16].…”

Strain distribution visualization of punched electrical steel sheets using neutron Bragg-edge transmission imaging

“…[1][2][3][4] In addition, the increase in the iron loss is significantly affected by strains due to either tensile and compressive deformations, or elastic and plastic deformations. 5,6) Several studies have carried out analytical estimation of strain distribution using a numerical model based on the finite element method. 7,8) However, experimental measurement of the internal strain distribution is important to validate such numerical analyses.…”