Test method for the mechanical strength of cores made of magnetic oxides

This document specifies a test method for the mechanical strength of cores made of magnetic
oxides. This test method is suitable for most of the E-cores, ETD-cores, I-cores and ringcores
but other core types such as U-cores could be tested according to a derived method
agreed by the parties concerned. This document is also applicable to the mechanical strength
measurement of magnetic powder cores.

Prüfverfahren zur Bestimmung der mechanischen Festigkeit von magnetischen Oxidkernen

Méthode d'essai pour la résistance mécanique des noyaux en oxydes magnétiques

IEC 61631:2020 est disponible sous forme de IEC 61631:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

Metode za preskušanje mehanske trdnosti jeder iz magnetnih oksidov

General Information

Status
Published
Publication Date
02-Sep-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Aug-2020
Due Date
15-Oct-2020
Completion Date
03-Sep-2020

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SLOVENSKI STANDARD
SIST EN IEC 61631:2020
01-oktober-2020
Nadomešča:
SIST EN 61631:2002
Metode za preskušanje mehanske trdnosti jeder iz magnetnih oksidov
Test method for the mechanical strength of cores made of magnetic oxides
Prüfverfahren zur Bestimmung der mechanischen Festigkeit von magnetischen
Oxidkernen
Méthode d'essai pour la résistance mécanique des noyaux en oxydes magnétiques
Ta slovenski standard je istoveten z: EN IEC 61631:2020
ICS:
29.100.10 Magnetne komponente Magnetic components
SIST EN IEC 61631:2020 en

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

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SIST EN IEC 61631:2020
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SIST EN IEC 61631:2020
EUROPEAN STANDARD EN IEC 61631
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 29.100.10 Supersedes EN 61631:2001 and all of its amendments
and corrigenda (if any)
English Version
Test method for the mechanical strength of cores made of
magnetic oxides
(IEC 61631:2020)

Méthode d'essai pour la résistance mécanique des noyaux Prüfverfahren zur Bestimmung der mechanischen Festigkeit

en oxydes magnétiques von magnetischen Oxidkernen
(IEC 61631:2020) (IEC 61631:2020)

This European Standard was approved by CENELEC on 2020-06-11. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61631:2020 E
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SIST EN IEC 61631:2020
EN IEC 61631:2020 (E)
European foreword

The text of document 51/1312/CDV, future edition 2 of IEC 61631, 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 61631:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-03-11

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-06-11

document have to be withdrawn

This document supersedes EN 61631:2001 and all of its amendments and corrigenda (if any).

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 61631:2020 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 63093-6 NOTE Harmonized as EN IEC 63093-6
IEC 63093-8 NOTE Harmonized as EN IEC 63093-8
IEC 63093-12 NOTE Harmonized as EN IEC 63093-12
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SIST EN IEC 61631:2020
EN IEC 61631:2020 (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
ISO 7500-2 - Metallic materials - Verification of static EN ISO 7500-2 -
uniaxial testing machines – Part 2: Tension
creep testing machines - Verification of the
applied force
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SIST EN IEC 61631:2020
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SIST EN IEC 61631:2020
IEC 61631
Edition 2.0 2020-05
INTERNATIONAL
STANDARD
Test method for the mechanical strength of cores made of magnetic oxides
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-8266-3

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

® Registered trademark of the International Electrotechnical Commission
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SIST EN IEC 61631:2020
– 2 – IEC 61631:2020 © IEC 2020
CONTENTS

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

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

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

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

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

4 Apparatus ........................................................................................................................ 6

4.1 Test core support and loading wedge ...................................................................... 6

4.2 Testing device ........................................................................................................ 7

4.3 Humidity measuring device ..................................................................................... 7

5 Test cores ....................................................................................................................... 7

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

5.2 Number of test cores ............................................................................................... 7

5.3 Precautions ............................................................................................................. 7

6 Testing ............................................................................................................................ 7

6.1 Test conditions ....................................................................................................... 7

6.2 Test procedures ...................................................................................................... 7

6.2.1 General ........................................................................................................... 7

6.2.2 Test of E-cores ................................................................................................ 8

6.2.3 Test of I-cores ............................................................................................... 10

6.2.4 Test of ring-cores .......................................................................................... 10

Annex A (normative) Standard dimensions of E-cores and their support

for strength test .................................................................................................................... 13

A.1 General ................................................................................................................. 13

A.2 Designation ........................................................................................................... 13

A.3 Test core support .................................................................................................. 13

Annex B (normative) Standard dimensions of ring-cores and methods for strength test ........ 15

B.1 General ................................................................................................................. 15

B.2 Selection of mechanical strength test method for ring-core ................................... 15

Bibliography .......................................................................................................................... 16

Figure 1 – E test ..................................................................................................................... 8

Figure 2 – W test .................................................................................................................... 9

Figure 3 – T test ..................................................................................................................... 9

Figure 4 – M test ................................................................................................................... 10

Figure 5 – I test .................................................................................................................... 10

Figure 6 – Stretching method ................................................................................................ 11

Figure 7 –Shearing method ................................................................................................... 12

Figure 8 – Pressure method .................................................................................................. 12

Figure A.1 – Designation of E-core ....................................................................................... 13

Figure B.1 – Dimensions of ring-core .................................................................................... 15

Table A.1 – Test core support ............................................................................................... 14

Table B.1 – Ring-core dimension designations ...................................................................... 15

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SIST EN IEC 61631:2020
IEC 61631:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEST METHOD FOR THE MECHANICAL STRENGTH
OF CORES MADE OF MAGNETIC OXIDES
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 61631 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This second edition cancels and replaces the first edition published in 2001. This edition

constitutes a technical revision.

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

edition:

a) the phrase: "This document is also applicable to the mechanical strength measurement of

magnetic powder cores" has been added in the scope;
b) IEC 61246 has been replaced by IEC 63093-8; EN 1002-2 has been replaced by
ISO 7500-1; ISO 4677-1 and ISO 4677-2 have been withdrawn;

c) dimensions D and F in Figure A.1 and Table A.1 have been changed to be consistent with

Figure 1 of IEC 63093-8:2018;
d) addition of the content of ring-cores test;
e) addition of Annex B;
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SIST EN IEC 61631:2020
– 4 – IEC 61631:2020 © IEC 2020
f) the location of the jig is amended in Fi
...

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