IEC 63182-2:2020

Magnetic powder cores - Guidelines on dimensions and the limits of surface irregularities - Part 2: Ring-cores

IEC 63182-2:2020 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of ring-cores (also called toroids) made of magnetic powder, the effective parameter values to be used in calculations involving them, and gives guidelines on allowable limits of surface irregularities applicable to coated ring-cores.
The selection of core sizes for this document is based on the philosophy of including those sizes which are industrial standards, meaning that they are in broad-based use within the industry. This document is considered as a sectional specification useful in the negotiations between magnetic powder core manufacturers and users about surface irregularities.

Noyaux en poudre magnétique comprimée - Lignes directrices concernant les dimensions et les limites des irrégularités de surface - Partie 2: Tores

L’IEC 63182:2020 spécifie les dimensions qui sont importantes pour l’interchangeabilité mécanique d’une gamme préférentielle de tores (aussi appelés tores bobinés) en poudre magnétique comprimée. Elle spécifie également les valeurs des paramètres effectifs à utiliser dans les calculs concernant ces tores, et donne des lignes directrices relatives aux limites admissibles des irrégularités de surface applicables aux tores revêtus.
Le choix des tailles de noyau pour le présent document repose sur la philosophie qui consiste à prendre en considération les tailles qui sont des étalons industriels, c'est-à-dire celles qui sont largement utilisées dans l’industrie. Le présent document est considéré comme une spécification intermédiaire, utile pour les négociations sur les irrégularités de surface entre les fabricants de noyaux en poudre magnétique comprimée et les utilisateurs.

General Information

• Status: Published
• Publication Date: 28-Sep-2020
• 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: 29-Sep-2020
• Completion Date: 23-Oct-2020

Standards Content (Sample)

IEC 63182-2 ®
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic powder cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 2: Ring-cores
Noyaux en poudre magnétique comprimée – Lignes directrices concernant
les dimensions et les limites des irrégularités de surface –
Partie 2: Tores
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IEC 63182-2 ®
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic powder cores – Guidelines on dimensions and the limits of surface

irregularities –
Part 2: Ring-cores
Noyaux en poudre magnétique comprimée – Lignes directrices concernant

les dimensions et les limites des irrégularités de surface –

Partie 2: Tores
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-8898-6

– 2 – IEC 63182-2:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Primary standards . 5
4.1 General . 5
4.2 Dimension descriptions . 6
4.3 Dimensions of ring-cores . 6
4.4 Chamfered edges. 6
4.5 Effective parameter values . 7
5 Limits of surface irregularities . 8
5.1 Cracks . 8
5.2 Peeling . 8
5.3 Pinholes . 9
5.4 Sharp chamfered edge . 9
5.5 Bubbles . 10
5.6 Unevenness . 10
Annex A (normative) Calculation method for the effective parameters of ring-cores . 11

Figure 1 – Dimensions of ring-cores . 6
Figure 2 – Chamfered edges of ring-cores . 6
Figure 3 – Cracks . 8
Figure 4 – Peeling. 9
Figure 5 – Pinholes . 9
Figure 6 – Sharp chamfered edge . 9
Figure 7 – Bubbles . 10
Figure 8 – Unevenness . 10

Table 1 – Dimensions descriptions . 6
Table 2 – Dimensions and geometrically calculated values for ring-cores . 7

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

Part 2: Ring-cores
FOREWORD
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International Standard IEC 63182-2 has been prepared by IEC technical committee 51:
Magnetic components, ferrite and magnetic powder materials.
The text of this International Standard is based on the following documents:
FDIS Report on voting
51/1348/FDIS 51/1352/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.

– 4 – IEC 63182-2:2020 © IEC 2020
A list of all parts of 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 "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.
MAGNETIC POWDER CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –

Part 2: Ring-cores
1 Scope
This part of IEC 63182 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of ring-cores (also called toroids) made of magnetic
powder, the effective parameter values to be used in calculations involving them, and gives
guidelines on allowable limits of surface irregularities applicable to coated ring-cores.
The selection of core sizes for this document is based on the philosophy of including those
sizes which are industrial standards, meaning that they are in broad-based use within the
industry. This document is considered as a sectional specification useful in the negotiations
between magnetic powder 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 63182-1, Magnetic powder cores – Guidelines on dimensions and 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 63182-1 and the
following 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
3.1
chamfered edge
circular or subcircular corner edge of core
Note 1 to entry: To facilitate the winding process, prior to applying the coating, the four sharp corner edges of the
ring-cores should be smoothed out using specialized machinery. Alternatively, rounding off some or all of the
corner edges can be achieved with rounded tooling components when powder is compacted to form the core.
4 Primary standards
4.1 General
Compliance with the following requirements ensures mechanical interchangeability of
complete assemblies and wound coils.

– 6 – IEC 63182-2:2020 © IEC 2020
4.2 Dimension descriptions
Table 1 describes the alphabetic character assignments for the dimensions of ring-cores.
Dimensions may refer to coated or uncoated nominal values, or to limit values.
Table 1 – Dimensions descriptions
Letter Dimensions description
A Outside diameter
B Inside diameter
C Height
4.3 Dimensions of ring-cores
Nominal and limit dimensions (see Figure 2) in widespread use in the industry are given
in Table 2.
Figure 1 – Dimensions of ring-cores
4.4 Chamfered edges
The approximate radius (r , see Figure 2) of each chamfered edge is designed to be large
enough to avoid damage to the coating of the typical gauge of the magnet wire that is used for
the core size. The value of r may be given as a nominal or minimum value. Typically, the
ratio of r to A is not less than 1/30.
Figure 2 – Chamfered edges of ring-cores

4.5 Effective parameter values
The effective parameter values given in Table 2 are calculated from the dimensions of the
uncoated ring-cores with minimum chamfered edges (r /A = 1/30). The calculation method is
given in Annex A.
Table 2 – Dimensions and geometrically calculated values for ring-cores
Uncoated dimensions Coated limit dimensions
a
l A V
e g e
A＇ B＇ C＇
A B C
2 3
mm mm mm mm mm mm mm mm mm
3,56 1,78 1,52 4,20 1,27 2,16 8,07 1,34 10,8
3,94 2,24 2,54 4,58 1,72 3,18 9,46 2,14 20,3
4,65 2,36 2,54 5,29 1,85 3,18 10,6 2,89 30,6
6,35 2,79 2,79 6,99 2,28 3,43 13,6 4,93 67,0
6,60 2,67 2,54 7,24 2,15 3,18 13,6 4,95 67,5
6,60 2,67 4,78 7,24 2,15 5,42 13,6 9,35 128
6,86 3,96 5,08 7,50 3,45 5,72 16,6 7,32 121
7,87 3,96 3,18 8,51 3,45 3,81 17,9 6,16 110
9,65 4,78 3,18 10,29 4,27 3,81 21,8 7,65 167
9,65 4,78 3,96 10,29 4,27 4,60 21,8 9,55 208
10,20 5,08 3,96 10,80 4,57 4,60 23,1 10,0 232
11,20 6,35 3,96 11,90 5,84 4,60 26,9 9,48 255
12,70 7,62 4,75 13,46 6,99 5,51 31,2 11,9 372
16,60 10,20 6,35 17,40 9,53 7,11 41,3 20,1 828
17,30 9,65 6,35 18,10 9,00 7,11 41,2 24,0 988
20,30 12,70 6,35 21,10 12,07 7,11 50,9 23,7 1 210
22,90 14,00 7,62 23,70 13,30 8,40 56,8 33,4 1 900
23,60 14,40 8,89 24,30 13,70 9,70 58,5 40,4 2 360
26,90 14,70 11,20 27,70 14,10 12,00 63,4 67,6 4 290
33,00 19,90 10,70 33,83 19,30 11,50 81,4 69,0 5 620
34,30 23,40 8,89 35,20 22,60 9,83 89,5 47,3 4 240
35,80 22,40 10,50 36,70 21,50 11,40 89,8 69,1 6 210
39,90 24,10 14,50 40,77 23,30 15,40 98,5 113 11 100
46,70 24,10 18,00 47,63 23,30 19,00 107 201 21 600
46,70 28,70 15,20 47,63 27,88 16,20 116 135 15 600
50,80 31,80 13,50 51,80 30,80 14,40 127 126 16 000
57,20 26,40 15,20 58,00 25,60 16,20 125 231 28 900
57,20 35,60 14,00 58,00 34,70 14,90 143 148 21 200
62,00 32,60 25,00 63,10 31,37 26,27 144 364 52 300
68,00 36,00 20,00 69,40 34,70 21,40 158 316 49 900
74,10 45,30 35,00 75,20 44,07 36,27 184 499 91 700
77,80 49,20 12,70 78,90 48,00 13,97 196 176 34 500
77,80 49,20 15,90 78,90 48,00 17,20 196 222 43 400
101,60 57,20 13,60 103,10 55,75 14,90 243 292 70 900
101,60 57,20 16,50 103,10 55,75 17,80 243 356 86 500
132,50 78,60 20,30 134,20 77,00 21,70 324 530 172 000

– 8 – IEC 63182-2:2020 © IEC 2020
Uncoated dimensions Coated limit dimensions
a
l A V
e g e
A B C A＇ B＇ C＇
2 3
mm mm mm mm mm mm mm mm mm
132,50 78,60 25,40 134,20 77,00 26,80 324 668 217 000
152,40 81,28 20,32 153,90 79,65 21,72 355 700 249 000
152,40 81,28 25,40 153,90 79,65 26,80 355 881 313 000
165,00 88,90 25,40 167,20 86,90 27,30 387 941 364 000
165,10 102,40 31,75 166,50 101,00 33,15 412 969 400 000
NOTE The amount of edge radius (r ) that is assumed when calculating A varies by core size and varies from
0 g
vendor to vendor. The usual case is to pick the same radius value for all four corners, so that the area loss to be
subtracted is (4－π)r . Usually ignored are that (1) top and bottom radiuses can be different from each other;
(2) side walls can have slight taper from top to bottom to facilitate pressing; (3) top and bottom surfaces can be
convex or concave rather than completely flat.
a
A is the geometric cross-sectional area.
g
5 Limits of surface irregularities
5.1 Cracks
The limits of cracks of uncoated cores are as follows (see Figure 3):
– cracks (C1) approximately parallel to the magnetic flux path are acceptable;
– cracks (C2) approximately perpendicular to the magnetic flux path are not acceptable.

Figure 3 – Cracks
5.
...