IEC 63093-14:2019

Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 14: EFD-cores

IEC 63093-14:2019 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EFD-cores, the essential dimensions of coil formers to 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.
This first edition cancels and replaces the first edition of IEC 62317-14 published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 62317-14:2008:  
guidelines on the limits of surface irregularities of EFD-cores were added.

Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des irrégularités de surface - Partie 14: Noyaux EFD

L’IEC 63093-14:2019 spécifie les dimensions qui présentent une importance pour l'interchangeabilité mécanique d'une plage préférentielle de noyaux EFD, les dimensions essentielles des supports de bobine à utiliser avec les noyaux EFD, ainsi que les valeurs des paramètres effectifs à utiliser dans les calculs qui impliquent ces noyaux. Elle donne également des recommandations relatives aux limites admissibles des irrégularités de surface applicables aux noyaux EFD conformément à la spécification générique correspondante.
Le choix des tailles des noyaux pour le présent document est fondé sur la philosophie consistant à introduire les tailles qui correspondent à des normes industrielles, soit par inclusion dans des normes nationales, soit par utilisation à grande échelle dans l’industrie.
Le présent document est une spécification utile à la négociation entre les fabricants et les utilisateurs de noyaux ferrites sur les irrégularités de surface.
Cette première édition annule et remplace la première édition de l’IEC 62317-14 parue en 2008. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’IEC 62317-14:2008:
ajout de lignes directrices relatives aux limites des irrégularités de surface des noyaux EFD.

General Information

• Status: Published
• Publication Date: 03-Apr-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.100.10 - Magnetic components
• Technical Committee: TC 51 - Magnetic components, ferrite and magnetic powder materials
• Drafting Committee: WG 1 - TC 51/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 03-May-2019
• Completion Date: 04-Apr-2019

Relations

• Replaces: IEC 62317-14:2008 - Ferrite cores - Dimensions - Part 14: EFD-cores for use in power supply applications
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 63093-14 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –
Part 14: EFD-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 14: Noyaux EFD
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IEC 63093-14 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –

Part 14: EFD-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des

irrégularités de surface –
Partie 14: Noyaux EFD
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-6764-6

– 2 – IEC 63093-14:2019 © IEC 2019
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Primary dimensions . 7
4.1 General . 7
4.2 Dimensions of EFD-cores . 7
4.2.1 Principal dimensions . 7
4.2.2 Effective parameter and A values . 8
min
4.3 Dimensional limits for coil formers. 8
4.4 Locations of pins and base outlines . 9
4.5 Pin diameter . 12
5 Mounting . 12
6 Definitions and limits of surface irregularities . 12
6.1 General . 12
6.2 Examples of surface irregularities . 12
6.3 Chips and ragged edges . 12
6.3.1 General . 12
6.3.2 Chips and ragged edges located on the mating surface . 12
6.3.3 Chips and ragged edges located on other surfaces . 13
6.4 Cracks . 15
6.5 Pull-out . 16
6.6 Crystallites . 16
6.7 Flash . 16
6.8 Pores . 17
Annex A (informative) EFD-core design . 18
Annex B (informative) Limits for allowable chipping areas . 19

Figure 1 – Dimensions of EFD-cores . 7
Figure 2 – Main dimensions of coil formers for EFD-cores . 8
Figure 3 – Locations of pins (SMD type) viewed from the upper side of the board . 10
Figure 4 – Locations of pins (PTH type) viewed from the upper side of the board . 11
Figure 5 – Examples of surface irregularities . 12
Figure 6 – Locations of chips and ragged edges . 13
Figure 7 – Locations of cracks . 15
Figure 8 – Location of pull-out . 16
Figure 9 – Location of crystallite . 16
Figure 10 – Location of flash . 17
Figure 11 – Location of pore . 17

Table 1 – Dimensions of EFD-cores . 7
Table 2 – Effective parameter and A values for EFD-cores . 8
min
Table 3 – Dimensional limits of coil formers for EFD-cores . 9
Table 4 – Area and length reference of irregularities for visual inspection . 14
Table 5 – Limits for cracks . 15
Table B.1 – Limits for allowable chipping areas. 19

– 4 – IEC 63093-14:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES –
GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES –

Part 14: EFD-cores
FOREWORD
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