Figure 6
Dependencies of core loss (a) and initial magnetic permeability (b) on frequency. (1) Core annealed in furnace (T a = 550°C, t a = 90 min). (2) Core made of ribbon heated by electric current (j h = 42 A/mm2, t h = 3.7 s). (3) Core made of helix-like ribbon heated by electric current (j h = 42 A/mm2, t h = 3.7 s).