Determination of the Minimum Gap Length in Ferrite Cores Using Measurements of Relative Effective Permeability

This paper discusses the way the minimum gap length of several ferrite magnetic reactors varies as the geometry of the core changes. The minimum gap length is a calculated value of air gap which will causes the theoretical value of relative effective permeability mu sub (re) to be matched with the measured value when no physical air gap is inserted between the core halves.