Magnetic materials
B-H, hysteresis, eddy currents — the iron behind every transformer and motor.
Lessons
Lesson 1
B-H curve & hysteresis
Magnetic basics, virgin curve and saturation, the hysteresis loop with B_r / H_c / B_sat, soft vs hard materials, Steinmetz hysteresis-loss model P_h = K_h·f·B_max^n.
Lesson 2
Iron losses — hysteresis + eddy current
Total core loss = P_h (∝f) + P_e (∝f²·t²·σ). Loss separation by plotting P/f vs f. Mitigation via thin laminations, silicon alloying, CRGO grain orientation, amorphous metal, ferrite cores.