Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 1: General specification

IEC 63093-1:2020 specifies the dimensions and allowable limits of surface irregularities of ferrite cores.
It is intended that this document excludes ferrite cores which are specialty cores with limited use. Also, special cores which are only marginal variations upon standard cores are excluded.
IEC publishes electrical standards for families of ferrite cores, as well as this series of dimensional standards for families of ferrite cores. Modifications to the ferrite cores listed in one type of standard are reflected in the other type.
This document is considered as a general specification useful in the dialogue between ferrite core suppliers and users about surface irregularities.
This first edition cancels and replaces the second edition of IEC 60424-1 published in 2015 and the first edition of IEC 62317-1 published in 2007. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous editions of IEC 60424-1 and IEC 62317-1:
a) this document integrates IEC 60424-1 and IEC 62317-1.

Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des irrégularités de surface - Partie 1: Spécification générale

L'IEC 63093-1:2020 spécifie les dimensions et les limites admissibles des irrégularités de surface des noyaux ferrites.
Il est prévu que le présent document exclue les noyaux ferrites qui sont des noyaux spécialisés dont l'utilisation est limitée. En outre, les noyaux spécialisés qui ne présentent que des variations marginales par rapport aux noyaux normalisés sont exclus.
L’IEC publie des normes électriques pour des familles de noyaux ferrites, ainsi que cette série de normes sur les dimensions pour des familles de noyaux ferrites. Les modifications apportées aux noyaux ferrites énumérés dans un type de norme sont reproduites dans l'autre type.
Le présent document est considéré comme une spécification générale utile au dialogue entre les fournisseurs de noyaux ferrites et leurs utilisateurs, portant sur les irrégularités de surface.
Cette première édition annule et remplace la deuxième édition de l’IEC 60424-1 parue en 2015 et la première édition de l’IEC 62317-1 parue en 2007. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport aux éditions précédentes de l’IEC 60424-1 et l’IEC 62317-1:
a) le présent document réunit l’IEC 60424-1 et l’IEC 62317-1.

General Information

Status
Published
Publication Date
15-Apr-2020
Current Stage
PPUB - Publication issued
Completion Date
16-Apr-2020
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IEC 63093-1
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of
surface irregularities –
Part 1: General specification
Noyaux ferrites – Lignes directrices relatives aux dimensions
et aux limites des irrégularités de surface –
Partie 1: Spécification générale
IEC 63093-1:2020-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63093-1
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of
surface irregularities –
Part 1: General specification
Noyaux ferrites – Lignes directrices relatives aux dimensions
et aux limites des irrégularités de surface –
Partie 1: Spécification générale
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-8079-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 63093-1:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Dimension descriptions .................................................................................................... 7

5 Location and functions of core parts and surfaces ........................................................... 7

5.1 General ................................................................................................................... 7

5.2 Mating surfaces ...................................................................................................... 8

5.3 Centre post ............................................................................................................. 8

5.4 Outer legs ............................................................................................................... 8

5.5 Back, bottom surface and back surfaces ................................................................. 8

5.6 Wire-slot area ......................................................................................................... 8

5.7 Wire-way area ......................................................................................................... 9

5.8 Clamping recess area ............................................................................................. 9

6 Area and length reference for visual inspection ............................................................... 9

7 Examples of surface irregularities .................................................................................. 11

8 Limits of surface irregularities ........................................................................................ 11

8.1 General ................................................................................................................. 11

8.2 Chips and ragged edges ....................................................................................... 11

8.3 Cracks .................................................................................................................. 11

8.4 Flash .................................................................................................................... 11

8.5 Pull-outs ............................................................................................................... 12

8.6 Pores .................................................................................................................... 12

8.7 Crystallites ............................................................................................................ 12

Annex A (informative) IEC 63093 series ............................................................................... 13

Bibliography .......................................................................................................................... 14

Figure 1 – Location of main core parts and surfaces – Example of RM-core type .................... 8

Figure 2 – Examples of surface irregularities ........................................................................ 11

Table 1 – Area and length reference for visual inspection ..................................................... 10

Table A.1 – IEC 63093 series ............................................................................................... 13

---------------------- Page: 4 ----------------------
IEC 63093-1:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES –
GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES –
Part 1: General specification
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 63093-1 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This first edition cancels and replaces the second edition of IEC 60424-1 published in 2015

and the first edition of IEC 62317-1 published in 2007. This edition constitutes a technical

revision.

This edition includes the following significant technical changes with respect to the previous

editions of IEC 60424-1 and IEC 62317-1:
a) this document integrates IEC 60424-1 and IEC 62317-1.
---------------------- Page: 5 ----------------------
– 4 – IEC 63093-1:2020 © IEC 2020
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1309/CDV 51/1327/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 63093 series, published under the general title Ferrite cores –

Guidelines on dimensions and the limits of surface irregularities, can be found on the IEC

website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 63093-1:2020 © IEC 2020 – 5 –
INTRODUCTION

Due to the method of manufacture and the physical nature of the products, ferrite cores can

be expected to exhibit some degree of physical irregularities such as chips, ragged edges,

cracks, flashing, and pull-outs.

The permissible extent of these surface irregularities will depend on the type, position and

size of the defect and on the function of the core. Thus, in order to establish limits of surface

irregularities for a given series of ferrite cores, for example RM-cores, pot-cores, E-cores, U-

cores and ring-cores, a particular specification should be prepared for each, setting out in

detail the permissible extent of the various types of irregularities.

All surfaces of the core should be clean and free from loose ferrite particles or any other

foreign matter. This is more critical for mating surfaces that should make good contact with

one another. Stains, discolorations, surface crazing or crystallization are acceptable if they do

not affect the normal performance of the core. The irregularities described below are

considered as being detectable without the use of any magnifying equipment.

The limits of surface irregularities are set for control of the cosmetic appearance, and not for

control of the magnetic performance. Surface irregularities do not substantially affect core

magnetic function, nor do they affect reliability. Reliability should be assessed for wound

magnetics, rather than for cores alone. See IEC 60401-3 for more details concerning the

reliability of ferrite cores and devices built with them.
A list of the IEC 63093 series is shown in Annex A.
---------------------- Page: 7 ----------------------
– 6 – IEC 63093-1:2020 © IEC 2020
FERRITE CORES –
GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES –
Part 1: General specification
1 Scope

This part of IEC 63093 specifies the dimensions and allowable limits of surface irregularities

of ferrite cores.

It is intended that this document includes ferrite cores which are widely used and referenced

in industry, either because they are included in national standards, or because they are seen

to have broad-based use in industry. Where applicable, it is intended that the existing

industrial name for each standard part appears with the part within this series.

It is intended that this document excludes ferrite cores which are specialty cores with limited

use. Also, special cores which are only marginal variations upon standard cores are excluded.

A ferrite core produced by only one or two suppliers can generally be considered a specialty

part, and not suitable as a standard core within this series. A ferrite core produced by three or

more competing manufacturers can generally be considered to be a candidate to be included

in this series.

IEC publishes electrical standards for families of ferrite cores, as well as this series of

dimensional standards for families of ferrite cores. Modifications to the ferrite cores listed in

one type of standard are reflected in the other type.

This document is considered as a general specification useful in the dialogue between ferrite

core suppliers and users about surface irregularities.
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 60401-2, Terms and nomenclature for cores made of magnetically soft ferrites – Part 2:

Reference of dimensions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60401-1 and the

following apply.
---------------------- Page: 8 ----------------------
IEC 63093-1:2020 © IEC 2020 – 7 –

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
3.1
chips and ragged edges, pl.

areas with missing surface material as a result of mechanical impact during handling

3.2
crack

surface irregularity which has a width much smaller than its length, and penetrates into the

core
3.3
flash

sharp feather-edge wall extending beyond the intended contour surface of the core

3.4
pull-out
removal of a surface layer of the core due to die "sticking"
3.5
pore
hole left on the surface of cores after sintering and surface finishing
3.6
crystallite

grain of abnormal size distinguishable on the surface, often with sparkling facets

4 Dimension descriptions
Dimension descriptions shall be as indicated in IEC 60401-2.
5 Location and functions of core parts and surfaces
5.1 General
Figure 1 shows the location of the main core parts and surfaces of an RM-core.
---------------------- Page: 9 ----------------------
– 8 – IEC 63093-1:2020 © IEC 2020

NOTE The back is a three-dimensional area surrounded by the bottom surface, back surface and two back walls.

Figure 1 – Location of main core parts and surfaces – Example of RM-core type
5.2 Mating surfaces

These surfaces are generally ground in order to limit the residual air gap between the two

core halves. Consequently, irregularities on these surfaces have to be considered as major

ones, and carefully evaluated with regard to their influence on the magnetic properties of the

complete circuit.
5.3 Centre post

This should be considered as the most important part of the core due to its function of

carrying the total flux generated by the winding. The centre post of ferrite cores is generally

circular (with or without a hole) or rectangular. If the centre post is circular, it is called centre

pole and if the centre post is rectangular, it is called centre leg.
5.4 Outer legs

The main function of the outer legs is to guide the magnetic flux in a closed magnetic circuit.

5.5 Back, bottom surface and back surfaces

The back has the same magnetic function as the outer legs; it can include wire-slots and wire-

way areas (for example on RM-cores), the shapes and dimensions of which are dictated by

the winding and isolation requirements.

Besides accommodating clamping, the back surface (ground or not) serves as a reference

plane for grinding the mating surface to achieve its required parallelism, flatness and

smoothness.
5.6 Wire-slot area

The wire-slot area is the lateral area of the outer walls, interfacing with the cut-out portion.

---------------------- Page: 10 ----------------------
IEC 63093-1:2020 © IEC 2020 – 9 –
5.7 Wire-way area

The wire-way area is located on the bottom (inside) surface of the back, also called the floor.

The wire-way runs radially from the centre post to the edge of the back wall, centred with

respect to the wire-slot areas. The purpose of the wire-way is to provide a path for leads to

reach from the inside of the coil to terminals on the outside.
5.8 Clamping recess area

The clamping recess areas on the back accommodate clamping clips, affording secure

mounting, and preventing mechanical interference from the clip above the plane of the back

surface.
6 Area and length reference for visual inspection

Irregularities such as chips, cracks and pull-outs should be compared to five simple

geometries which are shown in Table 1.

Such a table should be used as a reference for evaluation by operators either at the outgoing

stage (core manufacturers) or at the incoming inspection (customers).

Other methods than visual inspection can be used, such as computerized optical detection.

NOTE The minimum area and length considered are respectively 0,5 mm and 1 mm.
Recommended resolutions are as follows:
a) for the area:
2 2
– 0,5 mm up to 5 mm
2 2 2
– 1 mm from 5 mm to 10 mm
2 2 2
– 2,5 mm from 10 mm to 20 mm
2 2 2
– 5 mm from 20 mm to 50 mm
b) for the length:
– 1 mm from 1 mm to 5 mm
– 2,5 mm from 5 mm to 10 mm
---------------------- Page: 11 ----------------------
– 10 – IEC 63093-1:2020 © IEC 2020
Table 1 – Area and length reference for visual inspection
---------------------- Page: 12 ----------------------
IEC 63093-1:2020 © IEC 2020 – 11 –
7 Examples of surface irregularities
Figure 2 shows examples of different surface irregularities on an RM-core.
Figure 2 – Examples of surface irregularities
8 Limits of surface irregularities
8.1 General

In each particular specification relevant to a standardized core series, generic rules for the

calculation of limits should be defined for every kind of irregularity and for all core parts and

surfaces.

For guidance on the limits of irregularities, refer to the sectional specifications of the

IEC 63093 series, where limits according to core size are given in suitable tables, along with

identification of irregularity types on figures and drawings.
8.2 Chips and ragged edges

The simplest way of performing inspection on these two types of irregularities is to compare a

chip to a reference area limit and a ragged edge to a reference length.

The limits of chips are generally defined as a percentage of the related surface of the core.

The apparent area of a chip is considered to be the area of that chip.

The ragged edge length is generally limited to a percentage of the common perimeter of the

respective two surfaces.
8.3 Cracks

The limits of cracks are generally defined as a percentage of the specified core section

thickness.

The length of a crack is considered to be the actual length visible on the surface without

magnification.
8.4 Flash

Generally, no limit is defined but the critical places where flash is not allowed should be listed.

---------------------- Page: 13 ----------------------
– 12 – IEC 63093-1:2020 © IEC 2020
8.5 Pull-outs

The limits of pull-outs are generally defined as a percentage of the respective surface area.

The apparent area of a pull-out, neglecting actual depth, is considered to be the area of that

pull-out.
8.6 Pores

The limits of pores are generally defined as the numbers of pores of the specified core.

8.7 Crystallites

The limits of crystallites are generally defined as a percentage of the respective surface area

of the specified core.
---------------------- Page: 14 ----------------------
IEC 63093-1:2020 © IEC 2020 – 13 –
Annex A
(informative)
IEC 63093 series
The list for the IEC 63093 series is given in Table A.1.
Table A.1 – IEC 63093 series
New standard Original standard
IEC 63093-1, Ferrite cores – Guidelines on dimensions and the limits of
IEC 62317-1 2007
surface irregularities – Part 1: General specification
IEC 60424-1:2015

IEC 63093-2, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-2:2010

surface irregularities – Part 2: Pot-cores for use in telecommunications,
power supply, and filter applications

IEC 63093-3, Ferrite cores – Guidelines on dimensions and the limits of IEC 62323:2005

surface irregularities – Part 3: Half pot-cores made of ferrite for inductive
proximity switches

IEC 63093-4, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-4:2005

surface irregularities – Part 4: RM-cores
IEC 60424-2:2015

IEC 63093-5, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-5 2015

surface irregularities – Part 5: EP-cores and associated parts for use in
inductors and transformers

IEC 63093-6, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-6:2015

surface irregularities – Part 6: ETD-cores for use in power supplies
IEC 60424-3:2015
IEC 63093-7, Ferrite cores – Guidelines on dimensions and the limits of
IEC 62317-7:2005
surface irregularities – Part 7: EER-cores
IEC 60424-3:2015

IEC 63093-8, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-8:2006

surface irregularities – Part 8: E-cores
IEC 60424-3:2015

IEC 63093-9, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-9: 2006

surface irregularities – Part 9: Planar-cores
IEC 62317-9 AMD1:2007
IEC 60424-5: 2009

IEC 63093-11, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-11:2015

surface irregularities – Part 11: EC-cores for use in power supply
IEC 60424-3:2015
applications

IEC 63093-12, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-12:2016

surface irregularities – Part 12: Ring cores
IEC 60424-4:2015

IEC 63093-13, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-13:2015

surface irregularities – Part 13: PQ-cores
IEC 60424-8:2015

IEC 63093-14, Ferrite cores – Guidelines on dimensions and the limits of IEC 62317-14:2008

surface irregularities – Part 14: EFD-cores
---------------------- Page: 15 ----------------------
– 14 – IEC 63093-1:2020 © IEC 2020
Bibliography

IEC 60401-3, Terms and nomenclature for cores made of magnetically soft ferrites – Part 3:

Guidelines on the format of data appearing in manufacturers catalogues of transformer and

inductor cores
___________
---------------------- Page: 16 ----------------------
– 16 – IEC 63093-1:2020 © IEC 2020
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 17

INTRODUCTION ................................................................................................................... 19

1 Domaine d’application ................................................................................................... 20

2 Références normatives .................................................................................................. 20

3 Termes et définitions ..................................................................................................... 20

4 Descriptions des dimensions ......................................................................................... 21

5 Emplacement et fonctions des parties et des surfaces de noyaux .................................. 21

5.1 Généralités ........................................................................................................... 21

5.2 Surfaces de contact .............................................................................................. 22

5.3 Branche centrale ..................................................................................

...

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