IEC 63093-3:2020 pdf download

IEC 63093-3:2020 pdf download.Ferrite cores – Guidelines on dimensions and the limits of surface irregularities
1 Scope
This part of IEC 63093-3 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of half pot-cores made of ferrite, intended to be used in inductive proximity switches. Half pot-cores for inductive proximity switches are also called PS-cores. The selection of core sizes and shapes for this document is based on the philosophy of including those sizes and shapes which are industrial standards, either by inclusion in a national standard, or by broad-based use in industry. This part of IEC 63093 can also be considered as a sectional specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities. It provides guidelines on the allowable limits of surface irregularities applicable to PS-cores in accordance with the relevant generic specification.
2 Normative references
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 60401-1, Terms and nomenclature for cores made of magnetically soft ferrites – Part 1: Terms used for physical irregularities IEC 60424-1:2015, Ferrite cores – Guidelines on the limits of surface irregularities – Part 1: General specification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60401-1 and IEC 60424-1 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp
4 Primary dimensions
General 4.1 PS-cores are primarily suited for use in inductive proximity switches. The design of PS-cores is guided by the following considerations:4.4 Requirements In order to avoid damage to the coils and their interconnection wires, the core shall be delivered without flashes. Flashes according to 3.3 of IEC 60424-1:2015 shall not be present either on the winding area limiting surfaces, including edges, or on the wire connection feed- through holes. 4.5 Marking A manufacturer specific marking should be clearly visible for types PS 7,35 and larger, preferably on the back wall of the core.
5 Limits of surface irregularities
General 5.1 Surface irregularities are defined in IEC 60424-1. 5.2 Examples of surface irregularities Figure 3 shows different examples of surface irregularities on a PS-core.5.5 Pull-out, crystallite and pore locations for PS-cores Figure 7 shows an example of pull-out, crystallite and pore locations on the PS-core: – the cumulative area of the pull-outs on the bottom surface of the core shall be less than 25 % of the total respective surface area (including wire-way areas for the bottom surface); – the single area of any crystallite located on any surface shall be less than 2 % of the respective surface area; – the cumulative area of the crystallites located on any surface shall be less than 4 % of the respective surface area; – the number of pores located on the same surface shall not exceed two; the total number of pores located on all surfaces shall not exceed five; – a pore with an area larger than 1 mm 2 on any surface is not acceptable.