Coupled Effects of High- and Low-Frequency Harmonics on Domain Wall Dynamics in Grain-Oriented Fe-Si Structures

Sinusoidal magnetic induction waveforms are rarely observed in electrical machines due to the influence of factors like local saturation, rotor and stator geometries, and power supply effects. These conditions introduce various harmonic components, often extending to several hundred orders. A few studies indicate that high-frequency injection can modify the power-frequency induction spectrum in non-oriented steels, thereby reducing associated spectral component of magnetic losses. This study investigates the effects of high-frequency harmonics (up to a few kilohertz) in specially designed grain-oriented Fe-Si annular structures with helical easy axes. This configuration mitigates losses by counteracting hard magnetization directions in adjacent layers, allowing us to examine the interactions between low- and high-frequency phenomena in cores with varying 90° and 180° domain wall phase mixtures. We analyze the underlying physical mechanisms driving these interactions and their influence on the statistical behavior of domain wall motion, clarifying their effects on energy loss spectral components.