IEC 63093-12:2019
(Main)Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 12: Ring-cores
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 12: Ring-cores
IEC 63093-12:2019 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of ring-cores, also called toroid cores, and the effective parameter values to be used in calculations involving them. It also gives guidelines on allowable limits of surface irregularities applicable to ring-cores. This document is a specification useful in the negotiations between ferrite core manufacturers and users about surface irregularities.
This first edition cancels and replaces the first edition of IEC 62317-12 published in 2016 and the second edition of IEC 60424-4 published in 2015. This edition constitutes a technical revision.
IEC 63093-12 integrates the contents of IEC 62317-12:2016 and IEC 60424-4:2015.
Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des irrégularités de surface - Partie 12: Noyaux toriques
L’IEC 63093-12:2019 spécifie les dimensions importantes pour l’interchangeabilité matérielle d’une gamme préférentielle de noyaux toriques, et les valeurs des paramètres effectifs à utiliser dans les calculs les impliquant. Elle donne également des lignes directrices relatives aux limites admises des irrégularités de surface applicables aux noyaux toriques. Le présent document est une spécification utile dans les négociations entre les fabricants et les clients de noyaux ferrites au sujet des irrégularités de surface.
Cette première édition annule et remplace la première édition de l’IEC 62317-12 parue en 2016 et la deuxième édition de l’IEC 60424-4 parue en 2015. Cette édition constitue une révision technique.
L’IEC 63093-12 intègre le contenu de l’IEC 62317-12:2016 et de l’IEC 60424-4:2015.
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IEC 63093-12 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –
Part 12: Ring-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 12: Noyaux toriques
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IEC 63093-12 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –
Part 12: Ring-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 12: Noyaux toriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-6715-8
– 2 – IEC 63093-12:2019 © IEC 2019
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 ring-cores . 6
4.2.1 Designation of dimensions . 6
4.2.2 Identification of standard sizes . 6
4.2.3 Effective parameter values. 6
4.2.4 Dimensional limits for standard sizes . 7
4.3 Coating . 13
5 Limits of surface irregularities . 13
5.1 Uncoated ring-cores . 13
5.1.1 General. 13
5.1.2 Chips and ragged edges . 13
5.1.3 Cracks and pull-outs . 14
5.1.4 Crystallites . 14
5.1.5 Pores . 15
5.2 Coated ring-cores . 15
5.2.1 General. 15
5.2.2 Coating features . 15
5.2.3 Coating performance . 16
5.3 Area and length reference for visual inspection . 16
Bibliography . 18
Figure 1 – Dimensions of ring-cores . 6
Figure 2 – Location of chips and ragged edges on ring-cores . 14
Figure 3 – Location of cracks and pull-out on ring-cores . 14
Figure 4 – Location of crystallite on ring-cores . 15
Figure 5 – Location of pore on ring-cores . 15
Table 1 – Ring-core dimension designations . 6
Table 2 – Standard ring-cores . 7
Table 3 – Effective parameters of ring-cores . 9
Table 4 – Recommended dimensional limits for uncoated ring-cores . 11
Table 5 – Area and length reference for visual inspection . 17
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 12: Ring-cores
FOREWORD
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International Standard IEC 63093-12 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 62317-12 published in 2016 and
the second edition of IEC 60424-4 published in 2015. This edition constitutes a technical
revision.
This edition includes the following significant technical changes with respect to IEC 62317-
12:2016 and IEC 60424-4:2015:
a) IEC 63093-12 integrates the contents of IEC 62317-12:2016 and IEC 60424-4:2015.
– 4 – IEC 63093-12:2019 © IEC 2019
The text of this International Standard is based on the following documents:
FDIS Report on voting
51/1271/FDIS 51/1284/RVD
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.
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 12: Ring-cores
1 Scope
This part of IEC 63093 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of ring-cores, also called toroid cores, and the
effective parameter values to be used in calculations involving them. It also gives guidelines
on allowable limits of surface irregularities applicable to ring-cores.
This document is a specification useful in the negotiations between ferrite core manufacturers
and users 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 wound coils.
– 6 – IEC 63093-12:2019 © IEC 2019
4.2 Dimensions of ring-cores
4.2.1 Designation of dimensions
Figure 1 and Table 1 describe the alphabetic character assignments for the dimensions of
ferrite ring-cores.
Figure 1 – Dimensions of ring-cores
Table 1 – Ring-core dimension designations
Letter Dimension description
A Outside diameter
B Inside diameter
C Height
4.2.2 Identification of standard sizes
Table 2 shows the nominal dimensions for the range of standard ring-cores. Table 2 also
shows, where applicable, the origin and regional name of each standard size, whether from
historical European sizes, historical Japanese sizes, or historical USA sizes. The previous
IEC TR 61604 (now withdrawn) detailed the different ring sizes that were tooled and
commonly used in the three distinct geographic regions. IEC TR 61604 laid the groundwork
for the present document, which reflects the more global nature of the industry, compared to
the time when ferrite standards were evolving in different parts of the world. Manufacturers
tend to have more globally complete offerings of ring sizes than before, leading to a profusion
of different sizes.
The number of different ring sizes used in total is quite large, far in excess of the 82
commonly known standard sizes shown here, for a couple of reasons: ring-cores are relatively
inexpensive to build tooling for, nor does a new ring-core require an expensive new coil
former to be assembled, meaning that custom ring-cores are often commercially practical.
Ferrite rings, which lack a residual air gap, that E-cores and other shapes have at their mating
surfaces, exhibit directly the full magnetic performance possible in the ferrite material,
meaning that assembling precisely optimal new dimensions can give a significant advantage
to a designer that is optimizing for best possible performance.
4.2.3 Effective parameter values
The effective parameter values for the standard ring-cores are given in Table 3. For global
practicality and simplicity the effective parameters in this document are calculated from the
nominal dimensions, assuming cores of a rectangular cross section, and are useful for
reference and comparison of cores. For cores having a cross section with an appreciable
average rounding radius, more precise values shall be calculated from the method given in
IEC 60205, if required.
4.2.4 Dimensional limits for standard sizes
The standard tolerance limits for uncoated ring-cores are given in Table 4. Manufacturers can
choose to offer looser standard limits for ferrite materials that exhibit greater process
variability, or tighter limits for applications that justify higher processing and yield costs to
achieve a narrower dimensional range.
The limits take account of shrinkage variation and warping during firing. The specification for
the out-of-round condition of the inner or outer circumference is that the inside diameter (B)
and outside diameter (A) shall stay within the indicated limits, measured at any point. Similarly,
the specification for the non-flat condition of the sides of a ring is that the height minimum and
maximum shall be achieved at all points.
Table 2 – Standard ring-cores
Nominal uncoated dimensions Size reference
A (mm) B (mm) C (mm)
2,5 1,3 1,3
2,5 1,5 0,8
2,5 1,5 1,0 Europe R2,5
3,1 1,3 1,3
3,1 1,8 2,0
3,5 1,8 1,3
3,9 1,8 1,8
3,94 2,24 1,27 USA T3,9
4,0 2,0 2,0
4,0 2,2 1,6 Europe R4
4,83 2,29 1,27 USA T4,8
5,84 3,05 1,52 USA T5,8
6,0 3,0 2,0
6,0 4,0 2,0
6,3 3,8 2,5 Europe R6,3
7,62 3,18 4,78 USA T7,6
8,0 4,0 2,0
8,2 3,7 4,0
9,0 6,0 3,0
9,53 4,75 3,18 USA T9,5
10,0 5,0 4,0
10,0 5,0 5,0 Japan FOR 10
10,0 6,0 4,0 Europe R10
12,0 6,0 4,0 Japan FOR12
12,7 7,1 5,1
12,7 7,92 6,35 USA T12,7
13,2 7,4 4,0
13,6 7,0 3,5
14,0 8,0 7,0
14,0 9,0 5,0
15,88 8,89 4,7 USA T15,9
16,0 9,0 5,0
– 8 – IEC 63093-12:2019 © IEC 2019
Nominal uncoated dimensions Size reference
A (mm) B (mm) C (mm)
16,0 9,6 6,3 Europe R16
16,0 12,0 8,0
18,0 10,0 10,0 Japan FOR 18
18,5 9,8 10,3 Japan FOR 19
20,0 10,0 7,0 Europe R20
20,0 12,0 10,0 Japan FOR 20
22,0 14,0 10,0 Japan FOR 22
22,1 13,72 6,35 USA T22,1
25,0 15,0 10,0 Europe R25
25,0 15,0 12,0 Japan FOR 25
25,4 15,49 9,53 USA T25,4
26,9 14,2 12,2
28,0 16,0 13,0 Japan FOR 28
29,0 19,0 7,49 USA T29,0
30,8 19,1 12,7
31,0 19,0 13,0 Japan FOR 31
32,0 19,0 13,0
36,0 23,0 10,0 USA T36.0
36,0 23,0 15,0 Europe R36
38,0 19,0 13,0 Japan FOR 38
38,0 22,0 13,0
38,1 19,0 6,35 USA T38,1
40,0 24,0 16,0 Europe R40
40,0 24,0 20,0
41,8 26,2 18,0
44,5 30,0 13,0 Japan FOR 45
47,0 27,0 15,0 Japan FOR 47
49,1 31,8 15,9
49,1 33,8 15,9
50,0 30,0 20,0 Europe R50
51,0 32,0 19,0
55,0 32,0 19,0
58,0 41,0 18,0
61,0 35,6 12,7
63,0 38,0 25,0 Europe R63
68,0 48,0 13,0
72,0 48,0 20,0
73,7 38,9 12,7 USA T73,7
80,0 40,0 15,0
80,0 50,0 20,0
85,7 55,5 12,7
96,0 70,0 20,0
102,0 65,0 15,0
Nominal uncoated dimensions Size reference
A (mm) B (mm) C (mm)
104,0 80,0 20,0
107,0 65,0 18,0
127,0 89,0 20,0
140,0 106,0 25,0
152,0 104,0 19,0
202,0 153,0 25,0
305,0 207,0 30,0
Table 3 – Effective parameters of ring-cores
A B C C C A l V
1 2 e e e
-1 -3 2 3
mm mm mm mm mm mm mm mm
2,5 1,3 1,3 7,391 1 9,818 3 0,753 5,56 4,19
2,5 1,5 0,8 15,375 39,281 0,391 6,02 2,36
2,5 1,5 1,0 12,300 25,140 0,489 6,02 2,94
3,1 1,3 1,3 5,561 6 5,060 3 1,10 6,11 6,72
3,1 1,8 2,0 5,779 1 4,556 0 1,27 7,33 9,30
3,5 1,8 1,3 7,268 3 6,823 6 1,07 7,74 8,25
3,9 1,8 1,8 4,514 6 2,510 1 1,80 8,12 14,6
3,94 2,24 1,27 8,761 0 8,333 8 1,05 9,21 9,68
4,0 2,0 2,0 4,532 4 2,358 4 1,92 8,71 16,7
4,0 2,2 1,6 6,568 7 4,699 1 1,40 9,18 12,8
4,83 2,29 1,27 6,629 3 4,304 5 1,54 10,2 15,7
5,84 3,05 1,52 6,363 5 3,108 1 2,05 13,0 26,7
6,0 3,0 2,0 4,532 4 1,572 3 2,88 13,1 37,7
6,0 4,0 2,0 7,748 1 3,927 4 1,97 15,3 30,2
6,3 3,8 2,5 4,971 4 1,625 0 3,06 15,2 46,5
7,62 3,18 4,78 1,504 2 0,151 00 9,96 15,0 149
8,0 4,0 2,0 4,532 4 1,179 2 3,84 17,4 67,0
8,2 3,7 4,0 1,973 9 0,231 14 8,54 16,9 144
9,0 6,0 3,0 5,165 4 1,163 7 4,44 22,9 102
9,53 4,75 3,18 2,837 6 0,388 69 7,30 20,7 151
10,0 5,0 4,0 2,266 2 0,235 84 9,61 21,8 209
10,0 5,0 5,0 1,812 9 0,150 94 12,0 21,8 262
10,0 6,0 4,0 3,075 0 0,392 81 7,83 24,1 188
12,0 6,0 4,0 2,266 2 0,196 53 11,5 26,1 301
12,7 7,1 5,1 2,118 6 0,152 59 13,9 29,4 408
12,7 7,92 6,35 2,095 4 0,140 65 14,9 31,2 465
13,2 7,4 4,0 2,714 2 0,240 59 11,3 30,6 345
13,6 7,0 3,5 2,703 0 0,242 75 11,1 30,1 335
14,0 8,0 7,0 1,604 0 0,078 393 20,5 32,8 671
14,0 9,0 5,0 2,844 1 0,231 26 12,3 35,0 430
15,88 8,89 4,7 2,304 4 0,144 26 16,0 36,8 588
– 10 – IEC 63093-12:2019 © IEC 2019
A B C C C A l V
1 2 e e e
-1 -3 2 3
mm mm mm mm mm mm mm mm
16,0 9,0 5,0 2,184 1 0,128 29 17,0 37,2 633
16,0 9,6 6,3 1,952 4 0,098 969 19,7 38,5 760
16,0 12,0 8,0 2,730 1 0,171 81 15,9 43,4 689
18,0 10,0 10,0 1,069 0 0,027 502 38,9 41,5 1 610
18,5 9,8 10,3 0,960 07 0,022 158 43,3 41,6 1 800
20,0 10,0 7,0 1,295 0 0,038 504 33,6 43,6 1 460
20,0 12,0 10,0 1,230 0 0,031 425 39,1 48,1 1 880
22,0 14,0 10,0 1,390 1 0,035 349 39,3 54,7 2 150
22,1 13,72 6,35 2,075 6 0,079 499 26,1 54,2 1 410
25,0 15,0 10,0 1,230 0 0,025 140 48,9 60,2 2 940
25,0 15,0 12,0 1,025 0 0,017 458 58,7 60,2 3 530
25,4 15,49 9,53 1,333 1 0,028 812 46,3 61,7 2 850
26,9 14,2 12,2 0,806 12 0,010 764 74,9 60,4 4 520
28,0 16,0 13,0 0,863 67 0,011 365 76,0 65,6 4 990
29,0 19,0 7,49 1,983 8 0,053 767 36,9 73,2 2 700
30,8 19,1 12,7 1,035 4 0,014 203 72,9 75,5 5 500
31,0 19,0 13,0 0,987 28 0,012 912 76,5 75,5 5 770
32,0 19,0 13,0 0,927 15 0,011 223 82,6 76,6 6 330
36,0 23,0 10,0 1,402 4 0,021 939 63,9 89,6 5 730
36,0 23,0 15,0 0,934 95 0,009 750 7 95,9 89,6 8 600
38,0 19,0 13,0 0,697 29 0,005 875 7 119 82,7 9 820
38,0 22,0 13,0 0,884 32 0,008 716 9 101 89,7 9 100
38,1 19,0 6,35 1.422 1 0,024 412 58,3 8,8 4 830
40,0 24,0 16,0 0,768 75 0,006 137 6 125 96,.3 12 100
40,0 24,0 20,0 0,615 00 0,003 928 1 157 96,3 15 100
41,8 26,2 18,0 0,747 25 0,005 419 8 138 103 14 200
44,5 30,0 13,0 1,225 8 0,013 175 93,0 114 10 600
47,0 27,0 15,0 0,755 68 0,005 168 2 146 110 16 200
49,1 31,8 15,9 0,909 70 0,006 719 0 135 123 16 700
49,1 33,8 15,9 1,058 3 0,008 802 2 120 127 15 300
50,0 30,0 20,0 0,615 00 0,003 142 5 196 120 23 600
51,0 32,0 19,0 0,709 51 0,004 002 5 177 126 22 300
55,0 32,0 19,0 0,610 59 0,002 863 4 213 130 27 800
58,0 41,0 18,0 1,006 3 0,006 643 5 151 152 23 100
61,0 35,6 12,7 0,918 69 0,005 834 9 157 145 22 800
63,0 38,0 25,0 0,497 14 0,001 625 0 306 152 46 500
68,0 48,0 13,0 1,387 6 0,010 782 129 179 23 000
72,0 48,0 20,0 0,774 81 0,003 272 9 237 183 43 400
73,7 38,9 12,7 0,774 23 0,003 624 5 214 165 35 300
80,0 40,0 15,0 0,604 31 0,002 096 3 288 174 50 200
80,0 50,0 20,0 0,668 42 0,002 269 4 295 197 58 000
85,7 55,5 12,7 1,138 7 0,006 031 9 189 215 40 600
96,0 70,0 20,0 0,994 64 0,003 857 4 258 256 66 100
A B C C C A l V
1 2 e e e
-1 -3 2 3
mm mm mm mm mm mm mm mm
102,0 65,0 15,0 0,929 63 0,003 407 1 273 254 69 200
104,0 80,0 20,0 1,197 4 0,005 017 9 239 286 68 200
107,0 65,0 18,0 0,700 31 0,001 891 4 370 259 96 000
127,0 89,0 20,0 0,883 58 0,002 349 8 376 332 125 000
140,0 106,0 25,0 0,903 39 0,002 139 4 422 381 161 000
152,0 104,0 19,0 0,871 42 0,001 934 0 451 393 177 000
202,0 153,0 25,0 0,904 61 0,001 486 4 609 551 335 000
305,0 207,0 30,0 0,540 36 0,000 372 22 1450 784 1 140 000
Table 4 – Recommended dimensional limits for uncoated ring-cores
A Min. Max. B Min. Max. C Min. Max.
mm mm mm mm mm mm mm mm mm
2,5 2,35 2,65 1,3 1,15 1,45 1,3 1,15 1,45
2,5 2,35 2,65 1,5 1,35 1,65 0,8 0,65 0,95
2,5 2,35 2,65 1,5 1,35 1,65 1,0 0,85 1,15
3,1 2,95 3,25 1,3 1,15 1,45 1,3 1,15 1,45
3,1 2,95 3,25 1,8 1,65 1,95 2,0 1,85 2,15
3,5 3,35 3,65 1,8 1,65 1,95 1,3 1,15 1,45
3,9 3,75 4,05 1,8 1,65 1,95 1,8 1,65 1,95
3,94 3,79 4,09 2,24 2,09 2,39 1,27 1,12 1,42
4,0 3,80 4,20 2,0 1,85 2,15 2,0 1,85 2,15
4,0 3,80 4,20 2,2 2,05 2,35 1,6 1,45 1,75
4,83 4,63 5,03 2,29 2,14 2,44 1,27 1,12 1,42
5,84 5,64 6,04 3,05 2,90 3,20 1,52 1,37 1,67
6,0 5,80 6,20 3,0 2,85 3,15 2,0 1,85 2,15
6,0 5,80 6,20 4,0 3,85 4,15 2,0 1,85 2,15
6,3 6,10 6,50 3,8 3,65 3,95 2,5 2,35 2,65
7,62 7,42 7,82 3,18 3,03 3,33 4,78 4,48 5,08
8,0 7,80 8,20 4,0 3,85 4,15 2,0 1,85 2,15
8,2 8,00 8,40 3,7 3,55 3,85 4,0 3,75 4,25
9,0 8,70 9,30 6,0 5,80 6,20 3,0 2,80 3,20
9,53 9,23 9,83 4,75 4,55 4,95 3,18 3,03 3,33
10,0 9,70 10,30 5,0 4,80 5,20 4,0 3,85 4,15
10,0 9,70 10,30 5,0 4,80 5,20 5,0 4,85 5,15
10,0 9,70 10,30 6,0 5,80 6,20 4,0 3,85 4,15
12,0 11,60 12,40 6,0 5,75 6,25 4,0 3,85 4,15
12,7 12,30 13,10 7,1 6,85 7,35 5,1 4,90 5,30
12,7 12,30 13,10 7,92 7,67 8,17 6,35 6,15 6,55
13,2 12,80 13,60 7,4 7,15 7,65 4,0 3,85 4,15
13,6 13,20 14,00 7,0 6,75 7,25 3,5 3,35 3,65
14,0 13,50 14,50 8,0 7,70 8,30 7,0 6,80 7,20
14,0 13,50 14,50 9,0 8,70 9,30 5,0 4,80 5,20
– 12 – IEC 63093-12:2019 © IEC 2019
A Min. Max. B Min. Max. C Min. Max.
mm mm mm mm mm mm mm mm mm
15,88 15,38 16,38 8,89 8,59 9,19 4,7 4,50 4,90
16,0 15,50 16,50 9,0 8,70 9,30 5,0 4,80 5,20
16,0 15,50 16,50 9,6 9,30 9,90 6,3 6,10 6,50
16,0 15,50 16,50 12,0 11,70 12,30 8,0 7,70 8,30
18,0 17,40 18,60 10,0 9,70 10,30 10,0 9,70 10,30
18,5 17,90 19,10 9,8 9,50 10,10 10,3 10,00 10,60
20,0 19,40 20,60 10,0 9,70 10,30 7,0 6,80 7,20
20,0 19,40 20,60 12,0 11,70 12,30 10,0 9,70 10,30
22,0 21,40 22,60 14,0 13,60 14,40 10,0 9,70 10,30
22,1 21,50 22,70 13,72 13,32 14,12 6,35 6,15 6,55
25,0 24,25 25,75 15,0 14,50 15,50 10,0 9,70 10,30
25,0 24,25 25,75 15,0 14,50 15,50 12,0 11,60 12,40
25,4 24,65 26,15 15,49 14,99 15,99 9,53 9,23 9,83
26,9 26,15 27,65 14,2 13,70 14,70 12,2 11,80 12,60
28,0 27,25 28,75 16,0 15,50 16,50 13,0 12,50 13,50
29,0 28,00 30,00 19,0 18,40 19,60 7,49 7,09 7,89
30,8 29,80 31,80 19.1 18,50 19,70 12,7 12,30 13,10
31,0 30,00 32,00 19,0 18,40 19,60 13,0 12,60 13,40
32,0 31,00 33,00 19,0 18,40 19,60 13,0 12,60 13,40
36,0 34,90 37,10 23,0 22,30 23,70 10,0 9,70 10,30
36,0 34,90 37,10 23,0 22,30 23,70 15,0 14,50 15,50
38,0 36,80 39,20 19,0 18,30 19,70 13,0 12,50 13,50
38,0 36,80 39,20 22,0 21,30 22,70 13,0 12,50 13,50
38,1 36,90 39,30 19,0 18,30 19,70 6,35 6,05 6,65
40,0 38,80 41,20 24,0 23,30 24,70 16,0 15,50 16,50
40,0 38,80 41,20 24,0 23,30 24,70 20,0 19,30 20,70
41,8 40,60 43,00 26,2 25,50 26,90 18,0 17,40 18,60
44,5 43,15 45,85 30,0 29,20 30,80 13,0 12,60 13,40
47,0 45,65 48,35 27,0 26,20 27,80 15,0 14,50 15,50
49,1 47,60 50,60 31,8 30,90 32,70 15,9 15,40 16,40
49,1 47,60 50,60 33,8 32,90 34,70 15,9 15,30 16,50
50,0 48,50 51,50 30,0 29,10 30,90 20,0 19,40 20,60
51,0 49,50 52,50 32,0 31,10 32,90 19,0 18,40 19,60
55,0 53,30 56,70 32,0 31,10 32,90 19,0 18,40 19,60
58,0 56,30 59,70 41,0 40,10 41,90 18,0 17,40 18,60
61,0 59,10 62,90 35,6 34,50 36,70 12,7 12,20 13,20
63,0 61,10 64,90 38,0 36,90 39,10 25,0 24,20 25,80
68,0 66,10 69,90 48,0 46,80 49,20 13,0 12,50 13,50
72,0 70,00 74,00 48,0 46,80 49,20 20,0 19,40 20,60
73,7 71,70 75,70 38,9 37,70 40,10 12,7 12,20 13,20
80,0 77,60 82,40 40,0 38,80 41,20 15,0 14,40 15,60
80,0 77,60 82,40 50,0 48,80 51,20 20,0 19,20 20,80
85,7 83,30 88,10 55,5 54,10 56,90 12,7 12,10 13,30
A Min. Max. B Min. Max. C Min. Max.
mm mm mm mm mm mm mm mm mm
96,0 93,20 98,80 70,0 68,00 72,00 20,0 19,20 20,80
102,0 99,00 105,00 65,0 63,00 67,00 15,0 14,40 15,60
104,0 101,00 107,00 80,0 77,50 82,50 20,0 19,20 20,80
107,0 104,00 110,00 65,0 63,00 67,00 18,0 17,20 18,80
127,0 123,00 131,00 89,0 86,50 91,50 20,0 19,20 20,80
140,0 136,00 144,00 106,0 103,00 109,00 25,0 24,20 25,80
152,0 147,50 156,50 104,0 101,00 107,00 19,0 18,20 19,80
202,0 196,00 208,00 153,0 149,00 157,00 25,0 24,00 26,00
305,0 296,00 314,00 207,0 202,00 212,00 30,0 29,00 31,00
4.3 Coating
A variety of materials are used to provide dielectric protection by coating the surfaces of the
ring-cores to form a barrier. These include epoxies, polyurethanes, nylons, and paraxylylenes.
Manufacturers generally specify limits for maximum outside diameter with coating, minimum
inside diameter with coating, and maximum height with coating. The limits take into account
bare core variation and coating variation.
Minimum outside diameter, maximum inside diameter, and minimum height are either not
specified, or are considered of secondary importance, since coating cannot have a negative
thickness. The thickness of the coating is not directly specified or measured. Coating is
controlled for adequate thickness by means of voltage breakdown testing and visual
inspection.
5 Limits of surface irregularities
5.1 Uncoated ring-cores
5.1.1 General
Generally, uncoated ring-cores are smoothed (for example, by tumbling) to remove any
significant flash and to add radius to edges that would otherwise be sharp due to tooling
angles. Tooling angles exist where the compaction punches meet the interior of the die mold,
where a sharp angle in the edge of the piece that is formed is unavoidable. This is also the
location inside the ferrite tool set where flashing can occur. The purpose of removing flash
and rounding edges is to allow uncoated ring-cores to be wound with insulated wire, using
typical production winding processes, without damage to the wire.
5.1.2 Chips and ragged edges
Figure 2 shows examples of the location of chips and ragged edges on ring-cores.
Ragged edges as defined in IEC 60424-1 are allowed.
Chips shall not exceed 25 % of the wall thickness either in length or in width, up to a
maximum of 2 mm.
The maximum number of chips shall not exceed three on one core edge and a total of five on
all edges.
– 14 – IEC 63093-12:2019 © IEC 2019
Figure 2 – Location of chips and ragged edges on ring-cores
5.1.3 Cracks and pull-outs
Figure 3 shows examples of the location of cracks and pull-out on ring-cores.
Cracks (C1) perpendicular to the magnetic flux path are allowed but shall not exceed 20 % of
the wall thickness.
Cracks (C2) parallel to the magnetic flux are allowed but shall not exceed 12,5 % (1/8) of the
relevant core circumference.
Crazing (C3) which is a grid-like pattern of superficial cracks (e.g. depth less than 0,5 mm) is
allowed.
Pull-out (C4) is allowed but the relevant cumulative area on each affected core surface shall
not exceed 25 % of its area.
Excess dirt or ferrite debris on the surface or in the window of uncoated ring-cores is not
acceptable.
NOTE In any case, cores with surface irregularities will meet relevant electrical specifications.
Figure 3 – Location of cracks and pull-out on ring-cores
5.1.4 Crystallites
Figure 4 shows an example of the location of crystallite on ring-cores.
A single area of the 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.
Figure 4 – Location of crystallite on ring-cores
5.1.5 Pores
Figure 5 shows an example of the location of a pore on ring-cores.
The number of pores located on the same surface shall not exceed two; the total number of
pores located on all surfaces shall not exceed five.
A hole with an area larger than 1 mm on any surface is not acceptable.
Figure 5 – Location of pore on ring-cores
5.2 Coated ring-cores
5.2.1 General
Coated ring-cores are generally smoothed (e.g. by tumbling) before the coating process. A
variety of materials are used to provide dielectric protection by coating the surfaces of the
ring-cores to form a barrier. These include epoxies, polyurethanes, nylons, paraxylylenes, etc.
5.2.2 Coating features
A rough coating surface is acceptable provided that
1) dimensional specifications are met, and
2) the coating does not exhibit sharp features that would damage the insulated wire that is
applied using typical winding processes.
– 16 – IEC 63093-12:2019 © IEC 2019
Excess dirt or ferrite debris on the surface or in the window of the coated ring-cores is not
acceptable.
Partial coating exposing the bare core is unacceptable. Chips in a layer or layers of coating,
that expose other coating but not the bare core, are acceptable if they do not create sharp
edges, and if the voltage breakdown limit is met.
Pin holes on the surface of coated ring-cores are acceptable, provided that they meet the
relevant voltage breakdown specification. Air bubbles under the coating are not acceptable.
Sharp flashing arising from the method used for applying the coating is not acceptable.
Paraxylylene coatings can show varying appearances, ranging from transparent to milky white,
within individual production batches, and from batch to batch. This is acceptable, provided
that the relevant voltage breakdown specification is met.
5.2.3 Coating performance
Coated ring-cores shall withstand the relevant voltage breakdown specifications. Coated ring-
cores shall meet their relevant inductance, loss and other electrical performance limits.
Manufacturers can publish modified limits for certain coated ring-cores, compared with the
same cores uncoated, due to characteristic changes resulting from the mechanical stress of
coating.
5.3 Area and length reference for visual inspection
Irregularities such as chips, cracks and pull-outs should be compared to five simple
geometries which are shown in Table 5.
Such a table should be used as a reference for evaluation by operators either at the outgoing
stage (core manufacturers) or at the incoming inspection (customers).
Other methods than visual inspection can be used, such as computerized optical detection.
The minimum area and length considered are respectively 0,5 mm and 1 mm.
The recommended increments are as follows:
• for area
2 2
0,5 mm up to 5 mm
2 2 2
1 mm from 5 mm to 10 mm
2 2 2
2,5 mm from 10 mm to 20 mm
2 2 2
5 mm from 20 mm to 50 mm
• for length
1 mm from 1 mm to 5 mm
2,5 mm from 5 mm to 10 mm
Table 5 – Area and length reference for visual inspection
– 18 – IEC 63093-12:2019 © IEC 2019
Bibliography
IEC 60401-2, Terms and nomenclature for cores made of magnetically soft ferrites – Part 2:
Reference of dimensions
IEC 60424-4, Ferrite cores – Guidelines on the limits of surface irregularities – Part 4: Ring-
cores
IEC TR 61604 , Dimension of uncoated ring cores of magnetic oxides
IEC 62317-1, Ferrite cores – Dimensions – Part 1: General specification
___________
____________
This publication was withdrawn and replaced by IEC 62317-12:2016.
– 20 – IEC 63093-12:2019 © IEC 2019
SOMMAIRE
AVANT-PROPOS . 21
1 Domaine d’application . 23
2 Références normatives . 23
3 Termes et définitions . 23
4 Dimensions primaires . 23
4.1 Généralités . 23
4.2 Dimensions des noyaux toriques . 24
4.2.1 Désignation des dimensions . 24
4.2.2 Identification des tailles normalisées . 24
4.2.3 Valeurs des paramètres effectifs . 24
4.2.4 Limites dimensionnelles pour les tailles normalisées . 25
4.3 Enrobage . 31
5 Limites des irrégularités de surface . 31
5.1 Noyaux toriques non enrobés . 31
5.1.1 Généralités . 31
5.1.2 Éclats et bords ébréchés . 31
5.1.3 Fissures et collages . 32
5.1.4 Cristallites . 33
5.1.5 Pores . 33
5.2 Noyaux toriques enrobés . 33
5.2.1 Généralités . 33
5.2.2 Caractéristiques d'enrobage . 34
5.2.3 Performance de l'enrobage . 34
5.3 Références de surfaces et de longueurs pour le contrôle visuel . 34
Bibliographie . 37
Figure 1 – Dimensions des noyaux toriques . 24
Figure 2 – Emplacement des éclats et des bords ébréchés sur des noyaux toriques . 32
Figure 3 – Emplacement des fissures et du collage sur des noyaux toriques . 32
Figure 4 – Emplacement de cristallite sur des noyaux toriques . 33
Figure 5 – Emplacement de pore sur des noyaux toriques . 33
Tableau 1 – Désignations des dimensions du noyau torique . 24
Tableau 2 – Noyaux toriques normalisés . 25
Tableau 3 – Paramètres effectifs des noyaux toriques . 27
Tableau 4 – Limites dimensionnelles recommandées pour les noyaux toriques non
enrobés . 29
Tableau 5 – Références de surfaces et de longueurs pour le contrôle visuel . 36
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
NOYAUX FERRITES – LIGNES DIRECTRICES RELATIVES AUX
DIMENSIONS ET AUX LIMITES DES IRRÉGULARITÉS DE SURFACE –
Partie 12: Noyaux toriques
AVANT-PROPOS
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