Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 11: EC-cores for use in power supply applications

IEC 63093-11:2018 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EC-cores made of ferrite and the essential dimensions of coil formers to be used with them, as well the effective parameter values to be used in calculations involving them. It also gives guidelines on allowable limits of surface irregularities applicable to EC-cores.
The specifications contained in this document are useful in negotiations between ferrite core manufacturers and customers about surface irregularities.
This first edition cancels and replaces the first edition of IEC 62317-11 published in 2015 and the second edition of IEC 60424-3 published in 2015. This edition constitutes a technical revision.
This document includes the following significant technical changes with respect to IEC 62317­11:2015 and IEC 60424-3:2015:
a) This document integrates IEC 62317-11:2015 and IEC 60424­3:2015;
b) Table 3 – Allowable areas of chips for EC-cores, of IEC 60424-3:2015, has been moved to Annex B (informative) of this document.

Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des irrégularités de surface - Partie 11: Noyaux EC destinés aux applications d’alimentation électrique

L’IEC 63093-11:2018 spécifie les dimensions importantes pour l’interchangeabilité mécanique d’une plage préférentielle de noyaux EC en matériaux ferrites et les dimensions essentielles des supports de bobines à utiliser avec, ainsi que les valeurs des paramètres effectifs destinées aux calculs les impliquant. Elle donne également les lignes directrices relatives aux limites admissibles des irrégularités de surface applicables aux noyaux EC.
Les spécifications du présent document sont utiles au dialogue entre les fabricants de noyaux en ferrite et leurs clients sur les irrégularités de surface.Cette première édition annule et remplace la première édition de l’IEC 62317-11 parue en 2015 et la deuxième édition de l’IEC 60424-3 parue en 2015. Cette édition constitue une révision technique.
Ce document inclut les modifications techniques majeures suivantes par rapport à l'IEC 62317­11:2015 et à l’IEC 60424-3:2015:
a) ce document intègre l’IEC 62317-11:2015 et l’IEC 60424­3:2015;
b) le Tableau 3 – Surfaces admissibles des éclats pour les noyaux EC, de l’IEC 60424-3:2015, a été déplacé à l’Annexe B (informative) de ce document.

General Information

Status
Published
Publication Date
20-Jun-2018
Current Stage
PPUB - Publication issued
Completion Date
21-Jun-2018
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IEC 63093-11
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

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

Part 11: EC-cores for use in power supply applications
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites
des irrégularités de surface –
Partie 11: Noyaux EC destinés aux applications d’alimentation électrique
IEC 63093-11:2018-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63093-11
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

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

Part 11: EC-cores for use in power supply applications
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites
des irrégularités de surface –
Partie 11: Noyaux EC destinés aux applications d’alimentation électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-6203-0

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 63093-11:2018 © IEC 2018
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 EC-cores.......................................................................................... 6

4.2.1 Principal dimensions ...................................................................................... 6

4.2.2 Effective parameter and A values ............................................................. 6

min

4.3 Dimensional limits for coil formers........................................................................... 8

5 Limits of surface irregularities .......................................................................................... 8

5.1 General ................................................................................................................... 8

5.2 Examples of surface irregularities ........................................................................... 8

5.3 Chips and ragged edges ......................................................................................... 9

5.3.1 General.......................................................................................................... 9

5.3.2 Chips and ragged edges on the mating surfaces ............................................ 9

5.3.3 Chips and ragged edges on the other surfaces .............................................. 9

5.4 Cracks .................................................................................................................. 12

5.5 Flash .................................................................................................................... 12

5.6 Pull-outs ............................................................................................................... 12

5.7 Crystallites ............................................................................................................ 13

5.8 Pores .................................................................................................................... 13

Annex A (normative) Example of standard coil formers ........................................................ 15

Annex B (informative) Reference of allowable areas of chips ............................................... 17

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

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

Figure 2 – Main dimensions of coil formers for EC-cores......................................................... 8

Figure 3 – Examples of surface irregularities .......................................................................... 9

Figure 4 – Chip location for EC-cores ................................................................................... 10

Figure 5 – Crack and pull-out locations for EC-cores ............................................................ 12

Figure 6 – Crystallite location for EC-cores ........................................................................... 13

Figure 7 – Pore location for EC-cores ................................................................................... 14

Figure A.1 – Main dimensions of coil formers for EC 35, EC 41, EC 52, EC 70 cores ............ 15

Figure A.2 – Main dimensions of coil formers for EC 90 core ................................................ 15

Table 1 – Dimensions of EC-cores .......................................................................................... 7

Table 2 – Effective parameter and A values ....................................................................... 7

min

Table 3 – Dimensional limits for coil formers ........................................................................... 8

Table 4 – Area and length reference for visual inspection ..................................................... 11

Table 5 – Limits for cracks .................................................................................................... 13

Table A.1 – Main dimensions of coil formers (examples from Figures A.1 and A.2) for

EC-cores .............................................................................................................................. 16

Table B.1 – Allowable areas of chips for EC-cores ................................................................ 17

---------------------- Page: 4 ----------------------
IEC 63093-11:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 11: EC-cores for use in power supply applications
FOREWORD

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

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

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

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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.

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 63093-11 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This bilingual version (2018-11) corresponds to the monolingual English version, published in

2018-06.

This first edition cancels and replaces the first edition of IEC 62317-11 published in 2015 and

the second edition of IEC 60424-3 published in 2015. This edition constitutes a technical

revision.

This document includes the following significant technical changes with respect to

IEC 62317-11:2015 and IEC 60424-3:2015:
a) This document integrates IEC 62317-11:2015 and IEC 60424-3:2015;
---------------------- Page: 5 ----------------------
– 4 – IEC 63093-11:2018 © IEC 2018

b) Table 3 – Allowable areas of chips for EC-cores, of IEC 60424-3:2015, has been moved to

Annex B (informative) of this document.
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1214/CDV 51/1236/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.
The French version of this standard has not been voted upon.

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.
---------------------- Page: 6 ----------------------
IEC 63093-11:2018 © IEC 2018 – 5 –
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 11: EC-cores for use in power supply applications
1 Scope

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

interchangeability for a preferred range of EC-cores made of ferrite and the essential

dimensions of coil formers to be used with them, as well the effective parameter values to be

used in calculations involving them. It also gives guidelines on allowable limits of surface

irregularities applicable to EC-cores.

The specifications contained in this document are useful in negotiations between ferrite core

manufacturers and customers 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 coil formers.
---------------------- Page: 7 ----------------------
– 6 – IEC 63093-11:2018 © IEC 2018
4.2 Dimensions of EC-cores
4.2.1 Principal dimensions

The principal dimensions of EC-cores shall be those given in Figure 1 and Table 1.

values
4.2.2 Effective parameter and A
min

The effective parameter values of a pair of cores whose dimensions comply with 4.2.1 shall

be as given in Table 2. For the definitions of these parameters and their calculations,

reference shall be made to IEC 60205.
B C
IEC
Figure 1 – Dimensions of EC-cores
---------------------- Page: 8 ----------------------
IEC 63093-11:2018 © IEC 2018 – 7 –
Table 1 – Dimensions of EC-cores
A B C D E F r s T
Size mm mm mm mm mm mm mm mm mm

Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Max. Min. Max. Min. Max.

EC 35 33,7 35,3 17,15 17,45 9,2 9,8 11,9 12,6 22,2 23,3 9,2 9,8 0,5 2,5 3,0 27,7 29,3

EC 41 39,6 41,6 19,35 19,65 11,3 11,9 13,5 14,3 26,3 27,8 11,3 11,9 0,7 3,0 3,3 32,6 34,6

EC 52 50,9 53,5 24,05 24,35 13,05 13,75 15,5 16,3 32,1 33,9 13,05 13,75 0,8 3,5 4,0 42,7 45,3

EC 70 68,3 71,7 34,35 34,65 16,0 16,8 22,3 23,2 43,3 45,7 16,0 16,8 1,0 4,5 5,0 57,9 61,3

EC 90 88,2 91,8 44,35 45,65 29,0 31,0 35,0 36,0 68,5 71,5 29,0 31,0 1,0 5,2 5,8 77,2 80,8

EC 120 118,0 122,0 49,85 51,15 29,0 31,0 35,0 36,0 93,3 96,7 29,0 31,0 1,5 5,2 5,8 107,0 111,0

Table 2 – Effective parameter and A values
min
C C l A V A
1 2 e e e min
Size
-1 -3 2 3 2
mm mm mm mm mm mm
EC 35 0,857 84 9,490 2 × 10 77,5 90,4 7 010 70,9
EC 41 0,718 10 5,851 9 × 10 88,1 123 10 800 106
EC 52 0,572 11 103 181 18 600 141
3,168 9 × 10
EC 70 0,508 60 142 280 39 800 211
1,818 5 × 10
EC 90 0,342 51 0,544 66 × 10 215 629 135 000 570
EC 120 0,324 96 251 772 194 000 707
0,420 96 × 10

NOTE Manufacturers can indicate more precise values in their catalogues than those given in Table 2.

A is specified in IEC 60205.
min
---------------------- Page: 9 ----------------------
– 8 – IEC 63093-11:2018 © IEC 2018
4.3 Dimensional limits for coil formers

The essential dimensions of coil formers suitable for use with a pair of EC-cores shall be as

given in Table 3. The dimensions specified in Table 3 are illustrated in Figure 2.

Examples of standard coil formers are shown in Annex A.
IEC
Figure 2 – Main dimensions of coil formers for EC-cores
Table 3 – Dimensional limits for coil formers
d d d h h
1 2 3 1 2
Size mm mm mm mm mm
Max. Max. Min. Max. Min.
EC 35 21,8 12,3 9,9 23,6 21,4
EC 41 25,8 14,4 12,0 26,8 24,4
EC 52 31,6 16,3 13,85 30,7 28,2
EC 70 42,7 19,6 17,0 44,3 41,3
EC 90 67,7 35,6 31,4 69,6 64,8
EC 120 92,4 35,6 31,4 69,6 64,8
5 Limits of surface irregularities
5.1 General
Surface irregularities are defined in IEC 60424-1.
5.2 Examples of surface irregularities
Figure 3 shows different examples of surface irregularities of an EC-core.
---------------------- Page: 10 ----------------------
IEC 63093-11:2018 © IEC 2018 – 9 –
Cracks
Flash
Ragged
edge
Pull-out
Crystallite
Chip
Pore
IEC
Figure 3 – Examples of surface irregularities
5.3 Chips and ragged edges
5.3.1 General

The minimum area is taken as 0,5 mm , to be distinguishable to the naked eye, and the

maximum allowable area is 25 mm .
Examples of allowable areas of chips are given in Annex C.
5.3.2 Chips and ragged edges on the mating surfaces

The areas of the chips located on the mating surfaces (chip 1 and chip 1' irregularities in

Figure 4) shall not exceed the following limits:

– the cumulative area of the chips shall be less than 6 % of the mating surface (whether

gapped or ungapped) of the centre pole;

– the total length of the ragged edges shall be less than 25 % of the perimeter of the

relevant surface.
5.3.3 Chips and ragged edges on the other surfaces

The allowable areas of chips on the other surfaces are doubled as compared to the limits for

the mating surface (see Figure 4).
The rule for ragged edges is the same as that for the mating surface.
---------------------- Page: 11 ----------------------
– 10 – IEC 63093-11:2018 © IEC 2018
Matching surfaces
Chip 1'
Chip 2
Ragged
edge
Chip 1
IEC
Figure 4 – Chip location for EC-cores
---------------------- Page: 12 ----------------------
IEC 63093-11:2018 © IEC 2018 – 11 –
Area and length reference for visual inspection is given in Table 4.
Table 4 – Area and length reference for visual inspection
---------------------- Page: 13 ----------------------
– 12 – IEC 63093-11:2018 © IEC 2018
5.4 Cracks

The limits for cracks at various locations shown in Figure 5 are given in Table 5.

5.5 Flash

There shall be no flash extending from the core into the wire slot (see Figure 5).

5.6 Pull-outs

For EC-cores, the cumulative area of pull-outs of the core shall be less than 25 % of the total

respective surface area (see Figure 5).
S1''
S1'
S3''
S2'
S2''
S5'
Flash
S5''
Pull-out
S4'
S3'
S4'''
S4''
S6'
IEC
Figure 5 – Crack and pull-out locations for EC-cores
---------------------- Page: 14 ----------------------
IEC 63093-11:2018 © IEC 2018 – 13 –
Table 5 – Limits for cracks
Type Location Limits for Limits for
single crack multiple cracks
Mating surface of centre
S1 and S1' < 25 % of dimension W < 50 % of dimension W
pole
S1" Corner of centre pole Not acceptable Not acceptable

S2 and S2' Mating surface of outer leg < 25 % of dimension H < 25 % of dimension H

S2" Side of outer leg < 25 % of dimension H < 25 % of dimension H
S3 and S3" Centre pole < 25 % of dimension W < 25 % of dimension W
S3' Bottom corner of centre < 25 % of dimension W < 25 % of dimension W
pole / back wall and outer
leg / back wall
S4 Bottom corner of outer leg < 25 % of dimension T < 25 % of dimension T
/ back wall
S4' and S4" Back wall < 25 % of dimension T < 25 % of dimension T
S4''' Back wall < 50 % of dimension W < 100 % of dimension W
S5 and S5' and S5" Outer leg < 50 % of dimension W < 100 % of dimension W
S6 Back surface < 50 % of dimension W < 100 % of dimension W
S6' Back surface < 25 % of dimension W < 25 % of dimension W
S7 Corner of outer leg Not acceptable Not acceptable
5.7 Crystallites
Figure 6 shows an example of crystallite location on EC-cores:

– a single area of crystallites located on any surface shall be less than 2 % of the respective

surface area;

– the cumulative area of the crystallites located on any surface shall be less than 4 % of the

respective surface area (see Figure 6).
Crystallite
IEC
Figure 6 – Crystallite location for EC-cores
5.8 Pores
Figure 7 shows an example of pore location on EC-cores:

– the number of the pores located on the same surface shall not exceed two. The total

number of the pores located on all surfaces shall not exceed five;
– a hole with an area larger than 1 mm on any surface is not acceptable.
---------------------- Page: 15 ----------------------
– 14 – IEC 63093-11:2018 © IEC 2018
Pore
IEC
Figure 7 – Pore location for EC-cores
---------------------- Page: 16 ----------------------
IEC 63093-11:2018 © IEC 2018 – 15 –
Annex A
(normative)
Example of standard coil formers

Examples of standard coil formers for EC 35, EC 41, EC 52 and EC 70 cores are shown in

Figure A.1, and those for EC 90 cores are shown in Figure A.2 and in Table A.1.
c 2
g g g
IEC

Figure A.1 – Main dimensions of coil formers for EC 35, EC 41, EC 52, EC 70 cores

IEC
Figure A.2 – Main dimensions of coil formers for EC 90 core
---------------------- Page: 17 ----------------------
– 16 – IEC 63093-11:2018 © IEC 2018
Table A.1 – Main dimensions of coil formers
(examples from Figures A.1 and A.2) for EC-cores
c d d d e f g h h h h
1 2 3 1 2 3 4
Size mm mm mm mm mm mm mm mm mm mm mm

Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Nominal Min. Max. Min. Max. Min. Max. Min. Max.

EC 35 28,4 28,8 21,3 21,8 12,1 12,3 9,9 10,1 32,4 32,8 9,9 10,1 7,62 23,4 23,6 21,4 21,6 30,43 30,53 33,8 34,2

EC 41 28,4 28,8 25,5 25,8 14,2 14,4 12,0 12,2 37,0 37,4 12,0 12,2 7,62 26,6 26,8 24,4 24,6 32,97 33,07 38,3 38,5

EC 52 43,6 44,0 31,3 31,6 16,1 16,3 13,85 14,05 42,7 43,1 13,85 14,05 7,62 30,4 30,7 28,2 28,4 38,05 38,15 44,2 44,5

EC 70 56,3 56,7 42,4 42,7 19,4 19,6 17,0 17,3 56,0 56,5 17,0 17,3 10,16 44,0 44,3 41,3 41,6 50,75 50,85 57,6 58,0

EC 90 79,5 80,5 66,3 67,7 34,8 35,6 31,4 31,8 76,0 77,0 31,2 32,1 - 68,6 69,6 64,8 65,8 - - 89,1 90,5

---------------------- Page: 18 ----------------------
IEC 63093-11:2018 © IEC 2018 – 17 –
Annex B
(informative)
Reference of allowable areas of chips

The reference of allowable areas of chips for a given core is summarized in Table B.1.

NOTE Table B.1 has been taken from IEC 60424-3:2015, Table 3, and is included in Annex B for ease of

reference.
Table B.1 – Allowable areas of chips for EC-cores
Core size Mating surfaces Other surfaces
2 2
mm mm
EC 35 < 4 < 8
EC 41 < 6 < 12,5
EC 52 < 8 < 15
EC 70 < 12,5 < 25
EC 90 < 25 < 50
EC 20 < 25 < 50
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– 18 – IEC 63093-11:2018 © IEC 2018
Bibliography

IEC 60424-3:2015, Ferrite cores – Guidelines on the limits of surface irregularities – Part 3:

ETD-cores, EER-cores, EC-cores and E-cores

IEC 62317-11, Ferrite cores – Dimensions – Part 11: EC-cores for use in power supply

applications
_____________
____________
Withdrawn publication.
Withdrawn publication.
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– 20 – IEC 63093-11:2018 © IEC 2018
SOMMAIRE

SOMMAIRE .......................................................................................................................... 20

AVANT-PROPOS .................................................................................................................. 22

1 Domaine d'application ................................................................................................... 24

2 Références normatives .................................................................................................. 24

3 Termes et définitions ..................................................................................................... 24

4 Dimensions essentielles ............................................
...

Questions, Comments and Discussion

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