Ferrite cores - Guidelines on the limits of surface irregularities - Part 8: PQ-cores

This part of IEC 60424 gives guidance on allowable limits of surface irregularities applicable
to PQ-cores in accordance with the relevant generic specification.
This standard is considered as a sectional specification useful in the negotiation between
ferrite core manufacturers and users about surface irregularities.

Ferritkerne - Leitfaden für Grenzwerte von sichtbaren Beschädigungen der Kernoberfläche - Teil 8: PQ-Kerne

Noyaux ferrites - Guide relatif aux limites des irrégularités de surface - Partie 8: Noyaux PQ

L'IEC 60424-8:2015 est un guide relatif aux limites d'irrégularités de surface admissibles des noyaux PQ conformément à la spécification générique applicable. La présente norme est considérée comme une spécification intermédiaire utile en cas de négociation entre les fabricants de noyaux ferrites et les utilisateurs à propos des irrégularités de surface.

Feritna jedra - Smernice o omejitvah površinskih nepravilnostih - 8. del: Jedra PQ

Ta del standarda IEC 60424 podaja smernice o omejitvah površinskih nepravilnosti, ki veljajo za jedra PQ v skladu z ustrezno splošno specifikacijo. Ta standard je področna specifikacija in je uporabna za sklepanje dogovorov glede površinskih nepravilnosti med proizvajalci feritnih jeder in uporabniki.

General Information

Status
Published
Publication Date
16-Feb-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Jan-2016
Due Date
24-Mar-2016
Completion Date
17-Feb-2016

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SLOVENSKI STANDARD
SIST EN 60424-8:2016
01-marec-2016

Feritna jedra - Smernice o omejitvah površinskih nepravilnostih - 8. del: Jedra PQ

Ferrite cores - Guidelines on the limits of surface irregularities - Part 8: PQ-cores

Noyaux ferrites - Guide relatif aux limites des irrégularités de surface - Partie 8: Noyaux

Ta slovenski standard je istoveten z: EN 60424-8:2015
ICS:
29.100.10 Magnetne komponente Magnetic components
SIST EN 60424-8:2016 en

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

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SIST EN 60424-8:2016
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SIST EN 60424-8:2016
EUROPEAN STANDARD EN 60424-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2015
ICS 29.100.10
English Version
Ferrite cores - Guidelines on the limits of surface irregularities -
Part 8: PQ-cores
(IEC 60424-8:2015)

Noyaux ferrites - Lignes directrices relatives aux limites des Ferritkerne - Leitfaden für Grenzwerte von sichtbaren

irrégularités de surface - Partie 8: Noyaux PQ Beschädigungen der Kernoberfläche - Teil 8: PQ-Kerne

(IEC 60424-8:2015) (IEC 60424-8:2015)

This European Standard was approved by CENELEC on 2015-09-09. 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, 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: Avenue Marnix 17, B-1000 Brussels

© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60424-8:2015 E
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SIST EN 60424-8:2016
EN 60424-8:2015
European foreword

The text of document 51/1078/CDV, future edition 1 of IEC 60424-8, prepared by IEC/TC 51

"Magnetic components and ferrite materials" was submitted to the IEC-CENELEC parallel vote and

approved by CENELEC as EN 60424-8:2015.
The following dates are fixed:
(dop) 2016-06-09
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2018-09-09
• latest date by which the national standards conflicting with
the document have to be withdrawn

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

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 60424-8:2015 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 62317-13 NOTE Harmonized as EN 62317-13.
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SIST EN 60424-8:2016
EN 60424-8:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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 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 - Guide on the limits of EN 60424-1 -
surface irregularities -
Part 1: General specification
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SIST EN 60424-8:2016
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SIST EN 60424-8:2016
IEC 60424-8
Edition 1.0 2015-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on the limits of surface irregularities –
Part 8: PQ-cores
Noyaux ferrites – Lignes directrices relatives aux limites des irrégularités de
surface –
Partie 8: Noyaux PQ
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-2803-6

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 60424-8:2016
– 2 – IEC 60424-8:2015 © IEC 2015
CONTENTS

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

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

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

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

4 Limits of surface irregularities .......................................................................................... 6

4.1 Chips and ragged edges ......................................................................................... 6

4.1.1 Chips and ragged edges located on the mating surface ................................... 6

4.1.2 Chips located on other surfaces ....................................................................... 6

4.2 Cracks .................................................................................................................... 9

4.3 Pull-out ................................................................................................................. 10

4.4 Crystallites ............................................................................................................ 10

4.5 Flash .................................................................................................................... 11

4.6 Pores .................................................................................................................... 11

Bibliography .......................................................................................................................... 13

Figure 1 – Examples of surface irregularities .......................................................................... 5

Figure 2 – Chips and ragged edges location ........................................................................... 6

Figure 3 – Cracks location ...................................................................................................... 9

Figure 4 – Reference dimensions for PQ-cores ....................................................................... 9

Figure 5 – Pull-out location ................................................................................................... 10

Figure 6 – Crystallites location .............................................................................................. 11

Figure 7 – Flash location....................................................................................................... 11

Figure 8 – Pores location ...................................................................................................... 12

Table 1 – Limits for allowable chipping areas .......................................................................... 7

Table 2 – Area and length reference of irregularities for visual inspection ............................... 8

Table 3 – Limits for cracks .................................................................................................... 10

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SIST EN 60424-8:2016
IEC 60424-8:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES –
GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES –
Part 8: PQ-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 f
...

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