Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 2: Pot-cores for use in telecommunications, power supply, and filter applications

IEC 63093-2:2020 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of pot-cores made of ferrite, and the dimensional limits for coil formers to be used with them, as well as the effective parameter values to be used in calculations involving them. It also gives guidelines on the allowable limits of surface irregularities applicable to pot-cores in accordance with the relevant generic specification.
The selection of core sizes and shapes for this document is based on the philosophy of including those sizes which are industrial standards, either by inclusion in a national standard, or by broad-based use in industry. See IEC 62317-1 for more detail concerning the philosophy of selecting core sizes to be included.
The general considerations upon which the design of this range of cores is based are given in Annex A.
This first edition cancels and replaces the first edition of IEC 62317-2 published in 2010. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition of IEC 62317-2:
a) addition of the limits of surface irregularities;
b) Table 4 and Table 5 are updated in accordance with IEC 60205:2016.

Noyaux ferrite - Lignes directrices relatives aux dimensions et limites des irrégularités de surface - Partie 2: Circuits magnétiques en pots utilisés dans des applications de télécommunications, d'alimentation électrique et de filtre

L'IEC 63093-2:2020 spécifie les dimensions importantes pour l'interchangeabilité mécanique d'une gamme préférentielle de circuits magnétiques en pots en ferrite, les limites dimensionnelles des corps de bobines à utiliser avec ces pots et les valeurs de paramètres efficaces à utiliser dans les calculs les concernant. Elle donne également les lignes directrices relatives aux limites acceptables des irrégularités de surface applicables aux circuits magnétiques en pots conformément à la spécification générique correspondante.
Le choix des tailles et formes de noyau pour le présent document repose sur la philosophie consistant à introduire les tailles qui correspondent à des normes industrielles, soit dans une norme nationale soit par une utilisation à grande échelle dans le secteur industriel. Voir l'IEC 62317-1 pour de plus amples informations relatives à ce principe de choix des tailles de noyau à inclure.
Les considérations générales sur lesquelles s'appuie la conception de cette gamme de noyaux sont données à l'Annexe A.
Cette première édition annule et remplace la première édition de l'IEC 62317-2 parue en 2010. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente de l'IEC 62317-2:
a) ajout des limites des irrégularités de surface;
b) le Tableau 4 et le Tableau 5 sont mis à jour conformément à l'IEC 60205:2016.

General Information

Status
Published
Publication Date
26-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
27-Mar-2020
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IEC 63093-2
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 2: Pot-cores for use in telecommunications, power supply, and filter
applications
Noyaux ferrites – Lignes directrices relatives aux dimensions et limites des
irrégularités de surface –
Partie 2: Circuits magnétiques en pots utilisés dans des applications
de télécommunications, d'alimentation électrique et de filtre
IEC 63093-2:2020-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63093-2
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 2: Pot-cores for use in telecommunications, power supply, and filter
applications
Noyaux ferrites – Lignes directrices relatives aux dimensions et limites des
irrégularités de surface –
Partie 2: Circuits magnétiques en pots utilisés dans des applications
de télécommunications, d'alimentation électrique et de filtre
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-8008-9

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 63093-2:2020 © IEC 2020
CONTENTS

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

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

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

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

4 Primary dimensions ......................................................................................................... 7

4.1 Dimensions of pot-cores ......................................................................................... 7

4.1.1 General ........................................................................................................... 7

4.1.2 Principal dimensions ........................................................................................ 7

4.1.3 Wire-ways........................................................................................................ 9

4.1.4 Effective parameter values .............................................................................. 9

4.2 Main dimensions for coil formers ........................................................................... 10

5 Limits of surface irregularities ........................................................................................ 11

5.1 General ................................................................................................................. 11

5.2 Examples of surface irregularities ......................................................................... 11

5.3 Chips and ragged edges ....................................................................................... 12

5.3.1 General ......................................................................................................... 12

5.3.2 Chips and ragged edges on the mating surfaces ............................................ 12

5.3.3 Chips and ragged edges on the other surfaces .............................................. 12

5.4 Cracks .................................................................................................................. 15

5.5 Pull-out, crystallite and pore locations ................................................................... 16

5.6 Flash .................................................................................................................... 16

Annex A (informative) Pot-core design ................................................................................. 18

Annex B (informative) Example of gauges to check the dimensions of pot-cores .................. 19

B.1 General ................................................................................................................. 19

B.2 Procedure and requirements ................................................................................. 20

Bibliography .......................................................................................................................... 21

Figure 1 – Principal dimensions of pot-cores without back wall slots ....................................... 8

Figure 2 – Principal dimensions of pot-cores with back wall slots ............................................ 8

Figure 3 – Main dimensions of coil formers for pot-cores ...................................................... 11

Figure 4 – Examples of surface irregularities ........................................................................ 12

Figure 5 – Chips location for pot-cores ................................................................................. 13

Figure 6 – Cracks location – Top view .................................................................................. 15

Figure 7 – Cracks location – Bottom view ............................................................................. 15

Figure 8 – Pull-out, crystallite and pore locations .................................................................. 16

Figure 9 – Flash location....................................................................................................... 17

Figure B.1 – Dimensions of gauge A ..................................................................................... 19

Figure B.2 – Dimensions of gauges B and C ......................................................................... 20

Table 1 – Principal dimensions of pot-cores ............................................................................ 7

Table 2 – Limits for dimensions C and G ................................................................................. 9

Table 3 – Minimum wire-way depth ......................................................................................... 9

Table 4 – Effective parameter values for pot-cores with a centre hole ................................... 10

Table 5 – Effective parameter values for pot-cores without a centre hole .............................. 10

---------------------- Page: 4 ----------------------
IEC 63093-2:2020 © IEC 2020 – 3 –

Table 6 – Main dimensions of coil formers for pot-cores ........................................................ 11

Table 7 – Area and length references of irregularities for visual inspection ........................... 14

Table 8 – Limits for cracks .................................................................................................... 16

Table A.1 – Ratio of diameter to height ................................................................................. 18

Table B.1 – Dimensions of gauge A ...................................................................................... 19

Table B.2 – Dimensions of gauges B and C .......................................................................... 20

---------------------- Page: 5 ----------------------
– 4 – IEC 63093-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 2: Pot-cores for use in telecommunications,
power supply, and filter applications
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

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

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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 63093-2 has been prepared by technical committee 51: Magnetic

components, ferrite and magnetic powder materials.

This first edition cancels and replaces the first edition of IEC 62317-2 published in 2010. This

edition constitutes a technical revision.

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

edition of IEC 62317-2:
a) addition of the limits of surface irregularities;
b) Table 4 and Table 5 are updated in accordance with IEC 60205:2016.
---------------------- Page: 6 ----------------------
IEC 63093-2:2020 © IEC 2020 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1299/CDV 51/1322/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 of 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: 7 ----------------------
– 6 – IEC 63093-2:2020 © IEC 2020
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 2: Pot-cores for use in telecommunications,
power supply, and filter applications
1 Scope

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

interchangeability for a preferred range of pot-cores made of ferrite, and the dimensional

limits for coil formers to be used with them, as well as the effective parameter values to be

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

irregularities applicable to pot-cores in accordance with the relevant generic specification.

The selection of core sizes and shapes for this document is based on the philosophy of

including those sizes which are industrial standards, either by inclusion in a national standard,

or by broad-based use in industry. See IEC 62317-1 for more detail concerning the philosophy

of selecting core sizes to be included.

The general considerations upon which the design of this range of cores is based are given 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 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
---------------------- Page: 8 ----------------------
IEC 63093-2:2020 © IEC 2020 – 7 –
4 Primary dimensions
4.1 Dimensions of pot-cores
4.1.1 General

Compliance with the following requirements ensures mechanical interchangeability of

complete assemblies and wound coil formers.
4.1.2 Principal dimensions

The principal dimensions of pot-cores shall be as given in Table 1, Figure 1 and Figure 2. The

dimensions of the cores may be checked by means of gauges. By way of example, a possible

standard for these gauges is given in Annex B. In order to facilitate production it can be

necessary to use gauges having dimensions differing from those given in Annex B, although

no relaxation of the requirements for the dimensions of the cores given in Table 1 and in

Table 2 is permitted.
Table 1 – Principal dimensions of pot-cores
Dimensions in millimetres
A E F H 2B 2D r
Size Figure
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Max.
b b
P3,3/2,6 3,18 3,30 2,50 2,60 1,30 1,40 – – 2,50 2,60 1,70 1,90 0,20 1
b b
P4,6/3,1 4,40 4,60 3,50 3,65 1,90 2,00 – – 3,00 3,10 2,10 2,30 0,20 1
b b b b
P5,8/3,3 5,65 5,80 4,50 4,60 2,40 2,50 0,95 1,05 3,20 3,30 2,20 2,40 0,20 1
b b b
P7,4/4,0 7,15 7,35 5,80 5,95 2,95 3,00 1,05 1,15 4,10 4,20 2,80 3,00 0,20 1
b b b b
P9/5 9,00 9,30 7,50 7,75 3,70 3,90 2,00 2,20 5,10 5,40 3,60 3,90 0,25 2
b
P11/7 10,9 11,3 9,00 9,40 4,50 4,70 2,00 2,20 6,30 6,60 4,40 4,70 0,25 2
b
P14/8 13,8 14,3 11,6 12,0 5,80 6,00 3,00 3,20 8,20 8,50 5,60 6,00 0,25 2
P18/11 17,6 18,4 14,9 15,4 7,30 7,60 3,00 3,20 10,4 10,7 7,20 7,60 0,25 2
P22/13 21,2 22,0 17,9 18,5 9,10 9,40 4,40 4,70 13,2 13,6 9,20 9,60 0,35 2
b
P26/16 25,0 26,0 21,2 22,0 11,1 11,5 5,40 5,70 15,9 16,3 11,0 11,4 0,35 2
b
P30/19 29,5 30,5 25,0 25,8 13,1 13,5 5,40 5,70 18,6 19,0 13,0 13,4 0,35 2
P36/22 35,0 36,2 29,9 30,9 15,6 16,2 5,40 5,70 21,4 22,0 14,6 15,0 0,35 2
NOTE P3,3/2,6 and P4,6/3,1 cores are without the centre hole shown in Figure 1.

Sharp inner corners of pot-cores are preferable but in practice some rounding can occur, provided that radius

r is not exceeded.
The specified dimensional tolerances do not comply with IEC TR 63090.
---------------------- Page: 9 ----------------------
– 8 – IEC 63093-2:2020 © IEC 2020
Figure 1 – Principal dimensions of pot-cores without back wall slots
Figure 2 – Principal dimensions of pot-cores with back wall slots
---------------------- Page: 10 ----------------------
IEC 63093-2:2020 © IEC 2020 – 9 –
Table 2 – Limits for dimensions C and G
Dimensions in millimetres
Wire slot dimensions
a a
Size C G
Min. Max. Min. Max.
P3,3/2,6 – – 0,8 1,3
P4,6/3,1 – – 1,1 1,7
P5,8/3,3 – – 1,4 2,0
P7,4/4,0 – – 1,6 2,2
P9/5 6,0 7,5 1,6 2,4
P11/7 6,5 8,0 1,8 2,6
P14/8 8,7 10,0 2,3 4,1
P18/11 11,3 14,0 2,7 4,4
P22/13 13,3 16,5 3,0 4,4
P26/16 17,0 20,0 3,0 4,4
P30/19 20,0 23,0 3,5 5,3
P36/22 24,0 27,2 4,0 5,6

NOTE The shape of the slots is not defined, but the width G is indicated in the table.

It is recommended that any tightening of the tolerance on dimensions C should be towards the minimum

value and on dimension G towards the maximum value.
4.1.3 Wire-ways

Wire-ways are recesses in the floor of the pot-core, corresponding to the back wall slots,

which allow a path for wire leads from the centre of the coil to the outside. When wire-ways

are provided, their minimum depth shall be as given in Table 3.
Table 3 – Minimum wire-way depth
Dimensions in millimetres
Size Wire-way depth
P14/8 0,2
P18/11 0,3
P22/13 0,4
P26/16 0,5
P30/19 0,6
P36/22 0,6
4.1.4 Effective parameter values

The effective parameter values for pot-cores whose dimensions comply with 4.1.2 shall be as

given in Table 4 and Table 5. For the definitions of these parameters and their calculation,

reference shall be made to IEC 60205.
---------------------- Page: 11 ----------------------
– 10 – IEC 63093-2:2020 © IEC 2020
Table 4 – Effective parameter values for pot-cores with a centre hole
C C A l V A
1 2 e e e min
Size
−1 −3 −3 2 3 2
mm 10 mm mm mm mm mm
P5,8/3,3 1,632 6 345,47 4,73 7,72 36,5 3,66
P7,4/4,0 1,358 8 186,79 7,27 9,88 71,9 5,79
P9/5 1,215 5 119,54 10,2 12,4 126 7,88
P11/7 0,942 72 57,419 16,4 15,5 254 13,2
P14/8 0,766 82 29,977 25,6 19,6 502 19,8
P18/11 0,579 32 13,023 44,5 25,8 1 150 36,0
P22/13 0,484 67 7,494 0 64,7 31,3 2 030 50,9
P26/16 0,391 93 4,093 8 95,7 37,5 3 590 76,1
P30/19 0,325 76 2,355 4 138 45,1 6 230 115
P36/22 0,258 42 1,261 6 205 52,9 10 800 173

NOTE The effective parameter values of P9/5 to P36/22 are calculated as pot-cores with back wall slots.

Table 5 – Effective parameter values for pot-cores without a centre hole
C C A l V A
1 2 e e e min
Size
−1 −3 −3 2 3 2
mm 10 mm mm mm mm mm
P3,3/2,6 3,136 7 1 768,4 1,77 5,56 9,87 1,43
P4,6/3,1 2,088 7 609,06 3,43 7,16 24,6 2,60
P5,8/3,3 1,540 6 295,89 5,21 8,02 41,8 3,66
P7,4/4,0 1,294 1 163,38 7,92 10,3 81,2 5,79
P9/5 1,076 2 86,063 12,5 13,5 168 10,1
P11/7 0,874 18 46,857 18,7 16,3 304 15,2
P14/8 0,689 39 22,460 30,7 21,2 650 25,5
P18/11 0,545 61 11,083 49,2 26,9 1 320 40,2
P22/13 0,442 00 5,849 0 75,6 33,4 2 520 62,7
P26/16 0,358 04 3,220 0 111 39,8 4 430 93,6
P30/19 0,306 76 2,012 0 152 46,8 7 130 128
P36/22 0,248 69 1,140 9 218 54,2 11 800 185

NOTE The effective parameter values of P9/5 to P36/22 are calculated as pot-cores with back wall slots.

4.2 Main dimensions for coil formers

The main dimensions for coil formers shall be in accordance with Figure 3 and Table 6.

NOTE The dimensions of Table 6 which correspond to similar dimensions in Table 1 are labelled with the same

letter in upper case, for example, 2d corresponds to 2D in Table 1.
---------------------- Page: 12 ----------------------
IEC 63093-2:2020 © IEC 2020 – 11 –
Figure 3 – Main dimensions of coil formers for pot-cores
Table 6 – Main dimensions of coil formers for pot-cores
Dimensions in millimetres
Main dimensions of coil formers
Size e f 2d
Max. Min. Max.
P3,3/2,6 2,40 1,50 1,60
P4,6/3,1 3,40 2,10 2,00
P5,8/3,3 4,40 2,60 2,10
P7,4/4,0 5,70 3,10 2,70
P9/5 7,40 4,00 3,50
P11/7 8,90 4,80 4,30
P14/8 11,5 6,10 5,50
P18/11 14,8 7,70 7,10
P22/13 17,8 9,50 9,10
P26/16 21,1 11,6 10,9
P30/19 24,9 13,6 12,9
P36/22 29,8 16,3 14,5
5 Limits of surface irregularities
5.1 General
Surface irregularities are defined in IEC 60424-1.
5.2 Examples of surface irregularities
Figure 4 shows different examples of surface irregularities on a pot-core.
---------------------- Page: 13 ----------------------
– 12 – IEC 63093-2:2020 © IEC 2020
Figure 4 – 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.
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 5) shall not exceed the following limits:

– the cumulative area of the chips shall be less than 4 % of the total mating surface

(whether gapped or ungapped);

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

relevant mating 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 5, Chip 1”).
The rule for ragged edges is the same as that for the mating surface.

Chips and ragged edges are not acceptable on the inner edges of the wire slot area.

---------------------- Page: 14 ----------------------
IEC 63093-2:2020 © IEC 2020 – 13 –
Figure 5 – Chips location for pot-cores

The area and length references of irregularities for visual inspection are given in Table 7.

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Table 7 – Area and length references of irregularities for visual inspection
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IEC 63093-2:2020 © IEC 2020 – 15 –
5.4 Cracks

A single continuous crack which intersects the perimeter of the relevant surface at two points

is not acceptable (see S1, S1’ and S1” irregularities in Figure 6).

The limits for cracks at various locations shown in Figure 6 and Figure 7 are given in Table 8.

Figure 6 – Cracks location – Top view
Figure 7 – Cracks location – Bottom view
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Table 8 – Limits for cracks
Type Location Limits for Limits for
single crack multiple cracks
S1, S1’/S1” Any place Not acceptable Not acceptable
b c

S2, S2’ Mating surface of centre-pole ≤ 50 % of centre-pole thickness C entre-pole thickness

S3, S3’ Mating surface of outer wall 1/2 x W 2 x W
S4, S4’ Side wall of centre-pole Centre-pole thickness Centre-pole thickness
S5, S5’ Side wall of outer wall Wall thickness, W 4 x W
S6, S6’ Corner of centre-pole/back wall 25 % of centre-pole 25 % of centre-pole
circumference circumference
and outer wall/back wall
25 % of relevant arc 25 % of relevant arc
S7, S7’ Back surface Back wall thickness 4 x back wall thickness
S8 Wire slot ≤ 50 % of the back wall thickness Back wall thickness

The length of the crack is designated as the length on one surface. When the crack extends onto two surfaces,

the length of the crack is judged by the length on each surface.

The crack of the cores without a centre hole shall be 20 % or less of the diameter of the centre-pole.

The crack of the cores without a centre hole shall be 50 % or less of the diameter of the centre-pole.

5.5 Pull-out, crystallite and pore locations

Figure 8 shows examples of the locations of a pull-out, crystallite and pore on a pot core:

– the cumulative area of pull-outs on the bottom surface of the core shall be less than 25 %

of the total respective surface area (including wire-way areas for the bottom surface);

– the single area of the crystallite located on any surface shall be less than
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