Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 8: E-cores

IEC 63093-8:2018(E) specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of E-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 E-cores.
The specifications contained in this document are useful in negotiations between ferrite core manufacturers and customers about surface irregularities. The use of derived standards, which give more detailed specifications of component parts while still permitting compliance with this standard, is discussed in Annex A.
This edition includes the following significant technical changes with respect to IEC 62317-­8:2006 and IEC 60424-3:2015:
a. This document integrates IEC 62317-8:2006 and IEC 60424-3:2015;
b. Table 4 – Allowable areas of chips for E-cores, of IEC 60424-3:2015, has been moved to Annex C (informative) of this document.

General Information

Status
Published
Publication Date
26-Jun-2018
Current Stage
PPUB - Publication issued
Completion Date
27-Jun-2018
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IEC 63093-8
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 8: E-cores
IEC 63093-8:2018-06(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63093-8
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 8: E-cores
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-5835-4

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 63093-8:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 4

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

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

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

4 Primary dimensions ......................................................................................................... 6

4.1 General ................................................................................................................... 6

4.2 Dimensions of E-cores ............................................................................................ 7

4.2.1 Main dimensions .............................................................................................. 7

4.2.2 Effective parameter and A values ............................................................... 9

min

4.3 Dimensional limits for coil formers ........................................................................ 11

5 Limits of surface irregularities ........................................................................................ 15

5.1 General ................................................................................................................. 15

5.2 Examples of surface irregularities ......................................................................... 15

5.3 Chips and ragged edges ....................................................................................... 15

5.3.1 General ......................................................................................................... 15

5.3.2 Chips and ragged edges on the mating surfaces ............................................ 15

5.3.3 Chips and ragged edges on the other surfaces .............................................. 15

5.4 Cracks .................................................................................................................. 18

5.5 Flash .................................................................................................................... 18

5.6 Pull-outs ............................................................................................................... 18

5.7 Crystallites ............................................................................................................ 19

5.8 Pores .................................................................................................................... 19

Annex A (normative) Derived standards ............................................................................... 21

Annex B (normative) Example of dimensions for gauges to check the dimensions of

E-cores complying with this document .................................................................................. 22

B.1 General ................................................................................................................. 22

B.2 Procedure and requirements ................................................................................. 24

Annex C (informative) Reference of allowable areas of chips ............................................... 25

Bibliography .......................................................................................................................... 26

Figure 1 – Dimensions of E-cores with rectangular cross-section ............................................ 7

Figure 2 – Main dimensions of coil formers ........................................................................... 12

Figure 3 – Examples of surface irregularities ........................................................................ 15

Figure 4 – Chip location for E-cores ...................................................................................... 16

Figure 5 – Crack and pull-out locations for E-cores ............................................................... 18

Figure 6 – Crystallite location for E-cores ............................................................................. 19

Figure 7 – Pore location for E-cores ...................................................................................... 20

Figure B.1 – Gauge dimensions ............................................................................................ 22

Table 1 – Dimensions of E-cores with rectangular cross-section ............................................. 8

Table 2 – Effective parameter and A values ..................................................................... 10

min

Table 3 – Dimensional limits for coil formers ......................................................................... 13

Table 4 – Area and length reference for visual inspection ..................................................... 17

Table 5 – Limits for cracks .................................................................................................... 19

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IEC 63093-8:2018 © IEC 2018 – 3 –

Table B.1 – Gauge dimensions ............................................................................................. 23

Table C.1 – Allowable areas of chips for E-cores .................................................................. 25

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– 4 – IEC 63093-8:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 8: E-cores
FOREWORD

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

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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 63093-8 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 62317-8 published in 2006 and

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

revision.

This edition includes the following significant technical changes with respect to

IEC 62317-8:2006 and IEC 60424-3:2015:
a) This document integrates IEC 62317-8:2006 and IEC 60424-3:2015;

b) Table 4 – Allowable areas of chips for E-cores, of IEC 60424-3:2015, has been moved to

Annex C (informative) of this document.
---------------------- Page: 6 ----------------------
IEC 63093-8:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1213/CDV 51/1235/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 document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 7 ----------------------
– 6 – IEC 63093-8:2018 © IEC 2018
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 8: E-cores
1 Scope

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

interchangeability for a preferred range of E-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 E-cores.

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

manufacturers and customers about surface irregularities.

The use of derived standards, which give more detailed specifications of component parts

while still permitting compliance with this standard, is discussed in Annex A.
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 purpose 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: 8 ----------------------
IEC 63093-8:2018 © IEC 2018 – 7 –
4.2 Dimensions of E-cores
4.2.1 Main dimensions

The main dimensions of E-cores with rectangular cross-section shall be those given in Table 1.

The dimensions of the cores can be checked by means of gauges, an example of which is

given in Annex B. In order to facilitate production it can be necessary to use gauges with

dimensions differing from those given in Annex B, although no relaxation of the requirements

for the dimensions of the cores given in Table 1 is thereby permitted. The dimensions

specified in Table 1 are illustrated in Figure 1.
D C
IEC
Figure 1 – Dimensions of E-cores with rectangular cross-section
---------------------- Page: 9 ----------------------
– 8 – IEC 63093-8:2018 © IEC 2018
Table 1 – Dimensions of E-cores with rectangular cross-section
A B C D E F
IEC 61246 Industrial
Size mm mm mm mm mm mm
references references
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.

E5,3/2 5,15 5,35 2,57 2,73 1,90 2,00 1,92 2,08 3,80 4,00 1,30 1,40 E5,3/2 FEE5,25; EE5

E6,3/2 6,05 6,30 2,80 2,90 1,90 2,00 1,85 2,05 3,60 3,80 1,30 1,40 E6,3/2 FEE6,18

E8/2 7,85 8,15 3,95 4,05 2,30 2,40 2,85 2,95 5,60 5,80 2,30 2,40 E8/2 FEE8
E8,3/4 8,10 8,60 3,90 4,10 3,40 3,80 2,90 3,10 6,10 6,50 1,60 2,00 FEE8,3; EE8
E8,8/2 8,60 9,40 3,85 4,15 1,78 2,02 2,03 2,40 5,07 5,33 1,78 2,02 E8,8/2 FEE9
E10/3 9,80 10,2 4,88 5,00 2,88 3,00 3,50 3,62 7,00 7,30 2,88 3,00 E10/3 FEE10

E10,2/5 10,0 10,5 5,35 5,65 4,50 4,90 4,05 4,35 7,60 8,00 2,20 2,60 FEE10,2; EE10/11

E13/4 12,2 13,1 6,30 6,50 3,40 3,70 4,50 4,80 8,90 9,50 3,40 3,70 E13/4 FEE12,7A; EF12,6

E13/6 12,8 13,2 5,85 6,15 6,00 6,30 4,50 4,70 10,0 10,4 2,60 2,90 EE13

E16/4,8 15,7 16,3 7,00 7,30 4,60 5,00 5,00 5,40 11,7 12,3 3,80 4,20 FEE16A; EE16

E16/5 15,5 16,7 7,90 8,20 4,30 4,70 5,70 6,10 11,3 11,9 4,40 4,70 E16/5 FEE16,1; EF16

E19/5 18,6 19,4 7,80 8,20 4,80 5,20 5,40 5,80 14,2 14,8 4,30 4,70 FEE19A; EE19

E19,3/4,8 18,97 19,61 7,92 8,28 4,63 4,88 5,59 5,84 14,05 14,7 4,67 4,83 EE-187; EE19/16

E20/6 19,4 20,8 9,80 10,2 5,40 5,90 7,00 7,40 14,1 14,7 5,50 5,90 E20/6 FEE20,1; EF20

E25/7 24,3 25,8 12,3 12,8 6,90 7,50 8,70 9,20 17,5 18,3 7,00 7,50 E25/7 FEE25,1; EF25

E25,4/6 24,9 25,9 9,30 9,70 6,05 6,65 6,20 6,60 18,6 19,4 6,05 6,65 FEE25,4A

E25,4/6,3 24,9 25,9 9,27 9,65 6,10 6,48 6,22 6,60 18,55 19,81 6,10 6,60 EE24/25; EE25/19

E30/11 29,5 30,6 12,9 13,5 10,4 11,0 7,90 8,50 19,5 20,5 10,4 11,0 FEE30A; EE30

E32/9 31,3 32,9 15,8 16,4 8,80 9,50 11,2 11,8 22,7 23,7 8,90 9,50 E32/9 FEE32,1; EF32

E33/13 32,5 33,9 13,5 14,1 12,4 13,0 9,00 9,60 23,1 24,1 9,40 10,0 FEE33A; EE33

E34,6/9 33,9 35,3 13,9 14,64 8,90 9,72 9,51 10,05 25,0 26,2 9,10 9,70 EE375; EE35/28B

E35/10 34,5 35,7 15,2 15,8 9,70 10,3 9,20 9,80 24,5 25,5 9,70 10,3 FEE
...

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