IEC 63182-3:2021

Magnetic powder cores - Guidelines on dimensions and the limits of surface irregularities - Part 3: E-cores

IEC 63182-3:2021 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of E-cores made of metallic magnetic powder, the essential dimensions of coil formers to be used with them as well as the effective parameter values to be used in calculations involving them, and gives guidelines on allowable limits of surface irregularities applicable to E-cores.
This document is a specification useful in the negotiations between magnetic powder core suppliers and users about surface irregularities.

Noyaux en poudre magnétique - Lignes directrices concernant les dimensions et les limites des irrégularités de surface - Partie 3: Noyaux E

L’IEC 63182-3:2021 spécifie les dimensions qui sont importantes pour l’interchangeabilité mécanique d’une gamme préférentielle de noyaux E en poudre magnétique métallique, ainsi que les dimensions essentielles des supports de bobinages à employer avec ces noyaux E. Elle spécifie également les valeurs des paramètres effectifs à utiliser dans les calculs concernant ces derniers et donne des lignes directrices relatives aux limites admissibles des irrégularités de surface applicables aux noyaux E.
Le présent document est une spécification utile pour les négociations sur les irrégularités de surface entre les fournisseurs et les utilisateurs de noyaux en poudre magnétique.

General Information

• Status: Published
• Publication Date: 15-Dec-2021
• ICS: 29.100.10 - Magnetic components
• Technical Committee: TC 51 - Magnetic components, ferrite and magnetic powder materials
• Drafting Committee: WG 1 - TC 51/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 14-Jan-2022
• Completion Date: 16-Dec-2021

Standards Content (Sample)

IEC 63182-3 ®
Edition 1.0 2021-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic powder cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 3: E-cores
Noyaux en poudre magnétique – Lignes directrices concernant les dimensions
et les limites des irrégularités de surface –
Partie 3: Noyaux E
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IEC 63182-3 ®
Edition 1.0 2021-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic powder cores – Guidelines on dimensions and the limits of surface

irregularities –
Part 3: E-cores
Noyaux en poudre magnétique – Lignes directrices concernant les dimensions

et les limites des irrégularités de surface –

Partie 3: Noyaux E
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-1061-3

– 2 – IEC 63182-3:2021 © IEC 2021
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 E-cores . 6
4.2.1 Main dimensions . 6
4.2.2 Effective parameter and A values . 7
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 . 9
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 . 10
5.5 Flash . 11
5.6 Rust . 11
5.7 Discoloration . 11
Annex A (normative) Derived standards . 12

Figure 1 – Main dimensions of E-cores . 6
Figure 2 – Main dimensions of coil formers for E-cores . 8
Figure 3 – Examples of surface irregularities . 9
Figure 4 – Locations of chips and ragged edges for E-cores . 10
Figure 5 – Locations of cracks for E-cores . 10
Figure 6 – Locations of flashes for E-cores . 11
Figure 7 – Rust location for E-cores . 11

Table 1 – Main dimensions of E-cores . 6
Table 2 – Effective parameter and A values . 7
min
Table 3 – Dimensional limits for coil formers for E-cores . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC POWDER CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –

Part 3: E-cores
FOREWORD
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 63182-3 has been prepared by IEC technical committee 51: Magnetic components, ferrite
and magnetic powder materials. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
51/1397/FDIS 51/1402/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 4 – IEC 63182-3:2021 © IEC 2021
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 63182 series, published under the general title Magnetic powder
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 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.
MAGNETIC POWDER CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –

Part 3: E-cores
1 Scope
This part of IEC 63182 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of E-cores made of metallic magnetic powder, the
essential dimensions of coil formers to be used with them as well as the effective parameter
values to be used in calculations involving them, and gives guidelines on allowable limits of
surface irregularities applicable to E-cores.
This document is a specification useful in the negotiations between magnetic powder core
suppliers and users about surface irregularities.
The use of "derived" standards which give more detailed specifications of component parts
while still permitting compliance with this document 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 63182-1, Magnetic powder cores – Guidelines on dimensions and 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 63182-1 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.
– 6 – IEC 63182-3:2021 © IEC 2021
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 specified in Table 1 are illustrated in Figure 1.

Figure 1 – Main dimensions of E-cores
Table 1 – Main dimensions of E-cores
A B C D E F L
a
mm mm mm mm mm mm mm
Size
Min. Max. Min. Max. Min. Max. Min. Min. Min. Max. Nom.
E13/6/4 12,5 12,9 6,30 6,50 3,41 3,71 4,42 8,89 3,43 3,69 1,8
E19/8/5 19,0 19,6 7,92 8,28 4,63 4,93 5,5 13,9 4,65 4,91 2,4
E25/10/6 25,0 25,8 9,32 9,72 6,17 6,53 6,2 18,8 6,15 6,55 3,2
E30/15/7 29,6 30,5 14,77 15,23 6,88 7,24 9,7 19,5 6,76 7,16 5,1
E35/14/9 34,0 35,0 13,92 14,38 9,14 9,56 9,6 25,3 9,10 9,50 4,4
E41/17/13 40,3 41,5 16,25 16,75 12,25 12,75 10,4 28,3 12,25 12,75 6,0
E43/21/11 42,2 43,5 20,77 21,43 10,55 11,05 15,0 30,4 11,65 12,15 5,9
E43/21/15 42,2 43,5 20,77 21,43 15,10 15,70 15,0 30,4 11,65 12,15 5,9
E43/21/20 42,2 43,5 20,77 21,43 19,59 20,41 15,0 30,4 11,65 12,15 5,9
E55/28/21 54,1 55,7 27,15 28,01 20,19 21,01 18,5 37,5 16,42 17,18 8,4
E55/28/25 54,1 55,7 27,17 28,03 24,13 25,07 18,5 37,5 16,42 17,18 8,4
E65/33/27 64,1 66,1 32,00 33,00 26,47 27,53 22,2 44,2 19,29 20,11 10,0
E72/28/19 71,3 73,5 27,51 28,37 18,66 19,44 17,8 52,6 18,72 19,48 9,6
E80/38/20 78,8 81,2 37,50 38,70 19,39 20,21 28,1 59,3 19,39 20,21 9,9
E80/45/20 78,8 81,2 43,89 45,29 19,39 20,21 34,4 59,3 19,39 20,21 9,9
E130/33/54 128,3 132,3 32,00 33,00 52,90 54,80 22,0 108,4 19,59 20,41 10,0
E160/38/40 157,5 162,5 37,50 38,70 38,90 40,30 28,1 138,2 19,40 20,20 9,9

When new cores are designed, the tolerance ranges of dimensions should be calculated as follows:
Tolerance range of dimension A is approximately 3,0 % of the centre value of dimension A.
Tolerance range of dimension B is approximately 3,0 % of the centre value of dimension B.
Tolerance range of dimension C is approximately 3,5 % of the centre value of dimension C.
Tolerance range of dimension F is approximately 4,0 % of the centre value of dimension F.
For the dimensions B, C or F of 5 mm or less, the tolerance range may be larger than the recommended values.
a
The core size designation consists of three parts; the first indicates the length A of the core, the second its
width B and the third its thickness C.

4.2.2 Effective parameter and A values
min
The effective parameter values of a pair of cores having the dimensions given in 4.2.1 are as
shown in Table 2. For the definitions of these parameters and their calculations, see IEC 60205.
Table 2 – Effective parameter and A values
min
a
l A V
C C A
e e e
1 2 min
Size
-1 -3 2 3 2
mm
mm mm mm mm mm
E13/6/4 2,300 8 0,179 42 29,5 12,8 378 12,7 C
-2
39,9 23,1 921
E19/8/5 1,730 7 7,501 9 × 10 22,8 C
-2
48,0 40,4 1 940
E25/10/6 1,189 0 2,943 3 × 10 40,3 C, B
-2
E30/15/7 1,074 2 65,0 60,5 3 930 49,1 C
1,775 9 × 10
-3
E35/14/9 0,828 57 69,4 83,7 5 810 82,3 L, B
9,895 4 × 10
-3
E41/17/13 0,511 62 77,5 152 11 800 149 B
3,375 9 × 10
-3
98,4 128 12 600
E43/21/11 0,767 97 5,993 5 × 10 127 L
-3
98,4 183 18 000
E43/21/15 0,538 58 2,947 7 × 10 182 L
-3
98,4 237 23 300
E43/21/20 0,414 70 1,747 7 × 10 236 L
-4
E55/28/21 0,349 70 123 352 43 300
9,938 0 × 10 346 C, L
-4
E55/28/25 0,292 73 123 420 51 800 413 C, L
6,962 2 × 10
-4
E65/33/27 0,271 34 146 539 78 900 532 C
5,031 7 × 10
-4
137 370 50 600
E72/28/19 0,368 86 9,961 3 × 10 365 C
-3
184 391 72 200
E80/38/20 0,471 14 1,203 6 × 10 390 B
-3
210 393 82 600
E80/45/20 0,533 46 1,355 7× 10 392 C, L
-4
E130/33/54 0,192 44 211 1 100 231 000 1 080 C, L
1,756 8 × 10
-4
E160/38/40 0,338 12 264 782 207 000 780 B
4,323 6 × 10
NOTE 1 The suppliers can indicate in their catalogues more precise values than those given in Table 2.
NOTE 2 The above values have been calculated using the method given in IEC 60205. For the dimension values
of D and E used when calculating the effective parameters, D = (minimum dimension D) + 0,15 and E = ((maximum
dimension A) +( minimum dimension A)) / 2 – 2 × (nominal dimension L) are used.
NOTE 3 Because of the magnetic leakage effect, the actual inductance factors of the E-cores will be higher than
those calculated based on the effective parameters. The lower the permeability of the core, the more significant
the magnetic leakage effect, and the larger the difference between the actual value and the calculated value of
the inductance factor.
a
See IEC 60205 for the definition of A . The letters after the A values give the location of A : C is the
min min min
centre leg, L is the outer leg and B is the back wall.

– 8 – IEC 63182-3:2021 © IEC 2021
4.3 Dimensional limits for coil formers
The main dimensions of coil formers suitable for use with a pair of E-cores shall be as given in
Figure 2 and Table 3.
Figure 2 – Main dimensions of coil formers for E-cores
Table 3 – Dimensional limits for coil formers for E-cores
k l s s
c e f
2 1 2
Size
mm mm mm mm mm mm mm
Min. Max. Min. Min. Max. Min. Min.
E13/6/4 3,85 8,70 3,85 8,70 8,65 0,5 0,5
E19/8/5 5,1 13,7 5,1 13,7 10,8 0,5 0,5
E25/10/6 6,7 18,6 6,7 18,6 12,2 0,8 0,8
E30/15/7 7,4 19,3 7,4 19,3 19,2 0,8 0,8
E35/14/9 9,8 25,1 9,8 25,1 18,9 0,8 0,8
E41/17/13 13,0 28,0 13,0 28,0 20,5 0,8 0,8
E43/21/11 11,3 30,1 12,5 28,9 29,7 0,8 0,8
E43/21/15 16,0 30,1 12,5 33,6 29,7 0,8 0,8
E43/21/20 20,7 30,1 12,5 38,3 29,7 0,8 0,8
E55/28/21 21,4 37,1 17,5 41,0 36,6 1,0 1,0
E55/28/25 25,5 37,1 17,5 45,1 36,6 1,0 1,0
E65/33/27 28,0 43,7 20,5 51,1 43,9 1,0 1,0
E72/28/19 19,9 52,0 20,0 52,0 35,1 1,0 1,0
E80/38/20 20,8 58,6 20,8 58,6 55,6 1,0 1,0
E80/45/20 20,8 58,6 20,8 58,6 68,8 1,0 1,0
E130/33/54 55,4 107 21,1 141 43,4 1,2 1,2
E160/38/40 40,8 137 20,9 157 55,6 1,2 1,2

5 Limits of surface irregularities
5.1 General
Surface irregularities are defined in IEC 63182-1.

5.2 Examples of surface irregularities
Figure 3 shows different examples of surface irregularities of E-cores.

Figure 3 – Examples of surface irregularities
5.3 Chips and ragged edges
5.3.1 General
The minimum area for a chip is taken as 0,5 mm , so as to be distinguishable to the naked eye.
The maximum cumulative area of chips on a surface, regardless of core size, is 50 mm .
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’ in Figure 4) shall not
exceed the following limits:
– the cumulative area of the chips shall be less than 6 % of the mating surface of the centre
leg;
– 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
For the chips located on the other surfaces (chip 2 in Figure 4), the allowable cumulative area
of chips on each surface is doubled as compared to the limits for the mating surfaces.
The rule for ragged edges is the same as that for the mating surface.

– 10 – IEC 63182-3:2021 © IEC 2021

Figure 4 – Locations of chips and ragged edges for E-cores
The area and length reference for visual inspection is given in IEC 63182-1.
5.4 Cracks
The cracks at various locations are shown in Figure 6 – , and the allowable limits are as follows:
– for mating surfaces, cracks that are less than 1/4 of the reference dimension are allowed.
The sum total of crack lengths for each surface shall not exceed 1/2 of the reference
dimension;
– for non-mating surfaces, cracks shall not exceed 1/2 of the reference dimension. The total
number of such cracks shall not exceed 3;
– cracks that are in contact with edge at both ends are not allowed.
NOTE The reference dimension is the smallest dimension on a given surface.

Figure 5 – Locations of cracks for E-cores

5.5 Flash
There shall be no flash extending from the core into the inner wall of the outer leg or the inner
wall of the centre leg (see Figure 6).

Figure 6 – Locations of flashes for E-cores
5.6 Rust
Figure 7 shows an example of rust location for E-cores. The areas of the rust shall not exceed
the following limits:
– the areas of the rust located on the same surface shall not exceed 25 % of the surface area.

Figure 7 – Rust location for E-cores
5.7 Discoloration
Generally, no limit is defined. If necessary, a limit sample with this irregularity can be
designated by supplie
...