Abstract:
Non-oriented silicon steel sheets are widely used in various electrical equipment such as motors, and their magnetization and loss characteristics are significantly influenced by compressive stress. The existing hysteresis models considering compressive stress have problems such as low simulation accuracy and unclear parameter-dependent stress relationship. In this paper, based on the loss statistical theory and the field separation method, the effects of compressive stress on the magnetic field strength corresponding to hysteresis loss, eddy current loss and residual loss components are analyzed separately. In the original Energetic model, it introduces the energy density caused by compressive stress and derives the expression for the change in static magnetic field strength due to compressive stress, and then calculates the static magnetic field strength. It is clear that the magnetic field strength corresponding to the macroscopic eddy current loss within the elastic limit is not affected by compressive stress. Based on experiments and domain theory, it defines equivalent stress, derives the expression for the residual loss parameter
V0 and calculates the magnetic field strength corresponding to residual loss. Finally, the dynamic magnetic field intensity is calculated and the dynamic hysteresis model is established. The model calculation results and experimental results show that the proposed dynamic model parameters have a clear relationship with compressive stress and demonstrate high accuracy and practicality.