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Relationship between geometric permeability μgeo calculated by Equations (21), (22), and (25) and effective permeability μBH obtained using FEMM simulation in soft magnetic annuluses 100 × 60 mm with one air gap of length lg1 from 1 × 10−4 to 1.28 × 10−2 m. The dashed line corresponds to equation μgeo= μBH.
