BS EN IEC 63093-9:2020 pdf free.Ferrite cores – Guidelines on dimensions and the limits of surface irregularities Planar cores.
BS EN IEC 63093-9 This part of IEC 63093 specifies the shapes and dimensions of ferrite cores for inductive components (transformers and chokes), whose the coil is typically made of multi-layer boards (or the coil is part of the motherboard)， and the effective parameter values used in calculations. This document gives guidelines on allowable limits of surface irregularities applicable to planar-cores as well.This document is considered as a sectional specification useful in the negotiation between ferrite core suppliers and users about surface irregularities.The general consideration upon which the design of this range of cores is based is given in Annex A.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.IEC 60205:2016, Calculation of the effective parameters of magnetic piece parts IEC 60401-1，Terms and nomenclature for cores made of magnetically soft ferrites – Part 1:Terms used for physical irregularities IEC 60424-1，Ferrite cores 一Guidelines on the limits of surface irregularities 一Part 1:General specification The areas of the chips located on the mating surfaces (C1 and C1′ irregularities in Figure 7,Figure 8 and Figure 9) shall not exceed the following limits:the cumulative area of the chips shall be less than 4 % of the relevant mating surface. The mating surface of each outer leg and centre post is considered separately. The minimum area is taken as 0,5 mm2 to be distinguishable to the naked eye;the total length of the ragged edges shall be less than 25 % of the perimeter of the relevant mating surface.A uniform dimensional nomenclature has been chosen in order to facilitate a comparison of major physical attributes among the different core shapes.BS EN IEC 63093-9 pdf download.