BS EN IEC 63093-14 pdf free download
BS EN IEC 63093-14-2019 pdf free download.Ferrite cores – Guidelines on dimensions and the limits of surface irregularities Part 14: EFD-cores (IEC 63093-14:2019).
This part of IEC 63093 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EFD-cores, the essential dimensions of coil formersto be used with them, and the effective parameter values to be used in calculations involving them. It also gives guidance on the allowable limits of surface irregularities applicable to EFD- cores in accordance with the relevant generic specification.
The selection of core sizes for this document is based on the philosophy of including those sizes which are industrial standards, either by inclusion in national standards, or by broad- based use in industry.
This document is a specification useful in the negotiation between ferrite core manufacturers and users about surface irregularities.
The general considerations that the design of this range of cores is based upon are given in Annex A.
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 60205, 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 – 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
4.1 General
Compliance with the following requirements ensures mechanical interchangeability of complete assemblies and wound coil formers.
4.2 Dimensions of EFD-cores
4.2.1 Principal dimensions
The principal dimensions of EFD-cores shall be as given in Figure 1 and Table 1 .
4.2.2 Effective parameter and A min values The effective parameter values for cores having the dimensions given in 4.2.1 are as shown in Table 2. The definitions of effective parameters and their calculations shall be as given in IEC 60205.
4.3 Dimensional limits for coil formers
The main dimensions of coil formers suitable for use with a pair of EFD-cores shall be as given in Figure 2 and Table 3.
4.4 Locations of pins and base outlines
These shall be as shown in Figure 3 and Figure 4, in which the base is viewed in the mounting direction, i.e. from the upper side of the printed wiring board.
4.5 Pin diameter
Coil former pins (terminations) of through-hole type (PTH type) shall be accepted by a gauge having 1 ,3 mm holes on a true position.
5 Mounting
Concerning EFD-cores, no mounting assemblies are defined, although various mounting assembly clamps are offered commercially. It is recommended that the two cores be fixed by glue, by adhesive tape, or by mounting assembly clamps.
6 Definitions and limits
of surface irregularities
6.1 General
Surface irregularities are defined in IEC 60424-1 .
6.2 Examples of surface irregularities
Figure 5 shows examples of surface irregularities on an EFD-core.BS EN IEC 63093-14 pdf download.
