A graph of dynamic losses (represented as Rac/Rdc) versus the porosity factor at low frequency (so that ratio of wire diameter to skin depth is 0.8368), after: Xi Nan, Sullivan C.R., ''An improved calculation of proximity-effect loss in high-frequency windings of round conductors'', Power Electronics Specialist Conference, 2003. PESC '03. 2003 IEEE 34th Annual, Vol. 2, p. 853
porosity_factor_lf_magnetica.png
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