Losses Modeling Based on Domain Wall Processes and Validation Considering Rotational Excitation of Electrical Steel Sheets

The domain wall processes are investigated and modeled at low-to-medium frequencies in electrical steel sheets based on the damping principle of vibration. Due to the energy dissipation chiefly descends from a micro-vortex current caused by domain wall motion, the coupled Landau-Lifshitz-Gilbert and Maxwell electromagnetic diffusion equations are thus considered to describe the high-frequency characteristics. The overall core losses are eventually deduced in terms of separate contributions by domain wall processes and classical eddy current. Moreover, the calculation model can be extended to rotational excitation pattern. Hence, taking typical electrical steel sheets as example, the novel core loss calculation model is analyzed and compared with the total alternating core losses supplied by electrical steel sheet manufacturers and the 3-D rotating experimental core losses of testing sheets which are carried out by using a 3-D magnetic properties' testing system, and also achieve some beneficial conclusions.