Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 12: Ring-cores

This part of IEC 63093 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of ring-cores, also called toroid cores, and the
effective parameter values to be used in calculations involving them. It also gives guidelines
on allowable limits of surface irregularities applicable to ring-cores.
This document is a specification useful in the negotiations between ferrite core manufacturers
and users about surface irregularities.

Ferritkerne - Richtlinien zu Maßen und Grenzen von Oberflächenbeschädigungen - Teil 12: Ringkerne

Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des irrégularités de surface - Partie 12: Noyaux toriques

La présente partie de l’IEC 63093 spécifie les dimensions importantes pour l’interchangeabilité matérielle d’une gamme préférentielle de noyaux toriques, et les valeurs des paramètres effectifs à utiliser dans les calculs les impliquant. Elle donne également des lignes directrices relatives aux limites admises des irrégularités de surface applicables aux noyaux toriques. Le présent document est une spécification utile dans les négociations entre les fabricants et les clients de noyaux ferrites au sujet des irrégularités de surface.

Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti - 12. del: Obročasta jedra

Ta del standarda IEC 63093 določa mere, ki so pomembne za mehansko medsebojno zamenljivost prednostnega razpona obročastih jeder, imenovanih tudi toroidna jedra, in dejanske vrednosti parametrov, ki se uporabljajo pri izračunih, povezanih s temi jedri. Podaja tudi smernice glede omejitev površinskih nepravilnosti, ki veljajo za obročasta jedra.
Ta dokument je specifikacija, uporabna za sklepanje dogovorov o površinskih nepravilnostih med proizvajalci in uporabniki feritnih jeder.

General Information

Status
Published
Publication Date
11-Aug-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Jul-2019
Due Date
16-Sep-2019
Completion Date
12-Aug-2019

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SLOVENSKI STANDARD
SIST EN IEC 63093-12:2019
01-september-2019

Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti -

12. del: Obročasta jedra

Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 12:

Ring-cores
Ta slovenski standard je istoveten z: EN IEC 63093-12:2019
ICS:
29.100.10 Magnetne komponente Magnetic components
SIST EN IEC 63093-12:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 63093-12:2019
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SIST EN IEC 63093-12:2019
EUROPEAN STANDARD EN IEC 63093-12
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 29.100.10 Supersedes EN 62317-12:2016
EN 60424-4:2016
English Version
Ferrite cores - Guidelines on dimensions and the limits of
surface irregularities - Part 12: Ring-cores
(IEC 63093-12:2019)

Noyaux ferrites - Lignes directrices relatives aux Ferritkerne - Richtlinien zu Maßen und Grenzen von

dimensions et aux limites des irrégularités de surface - Oberflächenbeschädigungen - Teil 12: Ringkerne

Partie 12: Noyaux toriques (IEC 63093-12:2019)
(IEC 63093-12:2019)

This European Standard was approved by CENELEC on 2019-05-09. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 63093-12:2019 E
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SIST EN IEC 63093-12:2019
EN IEC 63093-12:2019 (E)
European foreword

The text of document 51/1271/FDIS, future edition 1 of IEC 63093-12, prepared by IEC/TC 51

"Magnetic components, ferrite and magnetic powder materials" was submitted to the IEC-CENELEC

parallel vote and approved by CENELEC as EN IEC 63093-12:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-02-09

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-05-09

document have to be withdrawn
This document supersedes EN 62317-12:2016 and EN 60424-4:2016

Attention is drawn to the possibility that some of the elements of this document may be the subject of

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

Endorsement notice

The text of the International Standard IEC 63093-12:2019 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60401-2 NOTE Harmonized as EN 60401-2
IEC 60424-4 NOTE Harmonized as EN 60424-4
IEC 62317-1 NOTE Harmonized as EN 62317-1
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SIST EN IEC 63093-12:2019
EN IEC 63093-12:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60205 - Calculation of the effective parameters of EN 60205 -
magnetic piece parts
IEC 60401-1 - Terms and nomenclature for cores made of EN 60401-1 -
magnetically soft ferrites - Part 1: Terms used for
physical irregularities

IEC 60424-1 - Ferrite cores - Guidelines on the limits of surface EN 60424-1 -

irregularities - Part 1: General specification
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SIST EN IEC 63093-12:2019
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SIST EN IEC 63093-12:2019
IEC 63093-12
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –

Part 12: Ring-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 12: Noyaux toriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-6715-8

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
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SIST EN IEC 63093-12:2019
– 2 – IEC 63093-12:2019 © IEC 2019
CONTENTS

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

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Primary dimensions ......................................................................................................... 5

4.1 General ................................................................................................................... 5

4.2 Dimensions of ring-cores ........................................................................................ 6

4.2.1 Designation of dimensions ............................................................................. 6

4.2.2 Identification of standard sizes ....................................................................... 6

4.2.3 Effective parameter values............................................................................. 6

4.2.4 Dimensional limits for standard sizes ............................................................. 7

4.3 Coating ................................................................................................................. 13

5 Limits of surface irregularities ........................................................................................ 13

5.1 Uncoated ring-cores .............................................................................................. 13

5.1.1 General........................................................................................................ 13

5.1.2 Chips and ragged edges .............................................................................. 13

5.1.3 Cracks and pull-outs .................................................................................... 14

5.1.4 Crystallites ................................................................................................... 14

5.1.5 Pores ........................................................................................................... 15

5.2 Coated ring-cores ................................................................................................. 15

5.2.1 General........................................................................................................ 15

5.2.2 Coating features .......................................................................................... 15

5.2.3 Coating performance ................................................................................... 16

5.3 Area and length reference for visual inspection ..................................................... 16

Bibliography .......................................................................................................................... 18

Figure 1 – Dimensions of ring-cores ........................................................................................ 6

Figure 2 – Location of chips and ragged edges on ring-cores ................................................ 14

Figure 3 – Location of cracks and pull-out on ring-cores ....................................................... 14

Figure 4 – Location of crystallite on ring-cores ...................................................................... 15

Figure 5 – Location of pore on ring-cores .............................................................................. 15

Table 1 – Ring-core dimension designations ........................................................................... 6

Table 2 – Standard ring-cores ................................................................................................. 7

Table 3 – Effective parameters of ring-cores ........................................................................... 9

Table 4 – Recommended dimensional limits for uncoated ring-cores ..................................... 11

Table 5 – Area and length reference for visual inspection ..................................................... 17

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SIST EN IEC 63093-12:2019
IEC 63093-12:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 12: Ring-cores
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

interested IEC National Committees.

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

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

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.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

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

International Standard IEC 63093-12 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This first edition cancels and replaces the first edition of IEC 62317-12 published in 2016 and

the second edition of IEC 60424-4 published in 2015. This edition constitutes a technical

revision.

This edition includes the following significant technical changes with respect to IEC 62317-

12:2016 and IEC 60424-4:2015:

a) IEC 63093-12 integrates the contents of IEC 62317-12:2016 and IEC 60424-4:2015.

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SIST EN IEC 63093-12:2019
– 4 – IEC 63093-12:2019 © IEC 2019
The text of this International Standard is based on the following documents:
FDIS Report on voting
51/1271/FDIS 51/1284/RVD

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 document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN IEC 63093-12:2019
IEC 63093-12:2019 © IEC 2019 – 5 –
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 12: Ring-cores
1 Scope

This part of IEC 63093 specifies the dimensions that are of importance for mechanical

interchangeability for a preferred range of ring-cores, also called toroid cores, and the

effective parameter values to be used in calculations involving them. It also gives guidelines

on allowable limits of surface irregularities applicable to ring-cores.

This document is a specification useful in the negotiations between ferrite core manufacturers

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 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 coils.
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SIST EN IEC 63093-12:2019
– 6 – IEC 63093-12:2019 © IEC 2019
4.2 Dimensions of ring-cores
4.2.1 Designation of dimensions

Figure 1 and Table 1 describe the alphabetic character assignments for the dimensions of

ferrite ring-cores.
Figure 1 – Dimensions of ring-cores
Table 1 – Ring-core dimension designations
Letter Dimension description
A Outside diameter
B Inside diameter
C Height
4.2.2 Identification of standard sizes

Table 2 shows the nominal dimensions for the range of standard ring-cores. Table 2 also

shows, where applicable, the origin and regional name of each standard size, whether from

historical European sizes, historical Japanese sizes, or historical USA sizes. The previous

IEC TR 61604 (now withdrawn) detailed the different ring sizes that were tooled and

commonly used in the three distinct geographic regions. IEC TR 61604 laid the groundwork

for the present document, which reflects the more global nature of the industry, compared to

the time when ferrite standards were evolving in different parts of the world. Manufacturers

tend to have more globally complete offerings of ring sizes than before, leading to a profusion

of different sizes.

The number of different ring sizes used in total is quite large, far in excess of the 82

commonly known standard sizes shown here, for a couple of reasons: ring-cores are relatively

inexpensive to build tooling for, nor does a new ring-core require an expensive new coil

former to be assembled, meaning that custom ring-cores are often commercially practical.

Ferrite rings, which lack a residual air gap, that E-cores and other shapes have at their mating

surfaces, exhibit directly the full magnetic performance possible in the ferrite material,

meaning that assembling precisely optimal new dimensions can give a significant advantage

to a designer that is optimizing for best possible performance.
4.2.3 Effective parameter values

The effective parameter values for the standard ring-cores are given in Table 3. For global

practicality and simplicity the effective parameters in this document are calculated from the

nominal dimensions, assuming
...

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