Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 4: RM-cores

IEC 63093-4:2019 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of RM-cores and low-profile RM-cores made of ferrite, and the locations of their terminal pins on a 2,54 mm printed wiring grid in relation to the base outlines of the cores. It also gives guidance on allowable limits of surface irregularities applicable to RM-cores in accordance with the relevant generic specification.
The selection of core sizes 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.
This document is a specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities.
This first edition cancels and replaces the first edition of IEC 62317-4 published in 2005 and the second edition of IEC 60424-2 published in 2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to IEC 62317-4:2005 and IEC 60424-2:2015:
a) IEC 63093-4 integrates the contents of IEC 62317-4:2005 and IEC 60424-2:2015;
b) IEC 60424-2:2015, Table 2, has been included in Annex C as Table C.1.

Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des irrégularités de surface - Partie 4: Noyaux RM

L'IEC 63093-4:2019 spécifie les dimensions qui jouent un rôle majeur dans l'interchangeabilité mécanique d'une gamme préférentielle de noyaux RM et de noyaux RM extra plats constitués de ferrite, et les emplacements de leurs broches de sortie sur une grille au pas de 2,54 mm d'un circuit imprimé par rapport aux encombrements de base des noyaux. Elle fournit également des recommandations sur les limites d'irrégularités de surface admissibles des noyaux RM, conformément à la spécification générique applicable.
Le choix de la taille des noyaux pour le présent document est fondé sur la philosophie consistant à introduire des tailles qui correspondent à des normes industrielles, soit par une prise en compte dans une norme nationale, soit par le biais d'une utilisation à grande échelle dans l'industrie.
Le présent document est une spécification utile pour les négociations entre les fabricants de noyaux ferrites et les clients à propos des irrégularités de surface.
Cette première édition annule et remplace la première édition de l'IEC 62317-4 parue en 2005 et la deuxième édition de l'IEC 60424-2 parue en 2015. Cette édition constitue une révision technique.
La présente édition inclut les modifications techniques majeures suivantes par rapport à l'IEC 62317­4:2005 et à l'IEC 60424-2:2015:
a) l'IEC 63093-4 intègre le contenu de l'IEC 62317-4:2005 et de l'IEC 60424-2:2015;
b) le Tableau 2 de l'IEC 60424-2:2015 a été inclus dans l'Annexe C en tant que Tableau C.1.

General Information

Status
Published
Publication Date
07-Mar-2019
Current Stage
PPUB - Publication issued
Completion Date
08-Mar-2019
Ref Project

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IEC 63093-4
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –

Part 4: RM-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 4: Noyaux RM
IEC 63093-4:2019-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63093-4
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE

Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –

Part 4: RM-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 4: Noyaux RM
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-6615-1

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 63093-4:2019 © IEC 2019
CONTENTS

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

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

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

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

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

4.1 General ................................................................................................................... 7

4.2 Dimensions of RM-cores ......................................................................................... 7

4.2.1 Principal dimensions ........................................................................................ 7

4.2.2 Effective parameter and A values ............................................................... 7

min

4.3 Main dimensions for coil formers ............................................................................. 7

4.3.1 Shape of coil former and pin numbering ........................................................... 7

4.3.2 Dimensions of coil formers for RM-cores for the primary standard ................... 7

4.3.3 RM-cores intended particularly for power applications ..................................... 7

4.4 Pin locations and base outlines ............................................................................... 7

4.5 Spring recess .......................................................................................................... 8

4.6 Stud recess ............................................................................................................. 8

5 Mounting ....................................................................................................................... 21

6 Limits of surface irregularities ........................................................................................ 21

6.1 General ................................................................................................................. 21

6.2 Examples of surface irregularities ......................................................................... 21

6.3 Chips and ragged edges ....................................................................................... 21

6.3.1 General ......................................................................................................... 21

6.3.2 Chip and ragged edges located on the mating surface ................................... 21

6.3.3 Chips and ragged edges located on other surfaces ........................................ 22

6.4 Cracks .................................................................................................................. 24

6.5 Pull-out ................................................................................................................. 26

6.6 Crystallites ............................................................................................................ 27

6.7 Flash .................................................................................................................... 27

6.8 Pores .................................................................................................................... 28

Annex A (informative) RM-core design ................................................................................ 29

A.1 General ................................................................................................................. 29

A.2 Pin locations and base outlines ............................................................................. 29

A.3 Design considerations and dimensions ................................................................. 29

A.4 Practical considerations ........................................................................................ 30

Annex B (normative) Guidance for measuring clamping forces relevant to RM-core

tests ..................................................................................................................................... 31

B.1 Test conditions and clamping forces ..................................................................... 31

B.2 Clamping procedure .............................................................................................. 31

Annex C (informative) Examples of allowable areas of chips ............................................... 33

Bibliography .......................................................................................................................... 34

Figure 1 – Dimensions of RM-cores ........................................................................................ 9

Figure 2 – Dimensions of low-profile RM-cores ..................................................................... 10

Figure 3 – Dimensions of spring recess ................................................................................ 12

Figure 4 – Dimensions of stud recess ................................................................................... 13

---------------------- Page: 4 ----------------------
IEC 63093-4:2019 © IEC 2019 – 3 –

Figure 5 – Main dimensions of coil formers for RM-cores ...................................................... 14

Figure 6 – Pin locations and base outlines viewed from the underside of the board ............. 16

Figure 7 – Dimensions of specific features ............................................................................ 18

Figure 8 – Pin locations and base outlines viewed from the underside of the board .............. 20

Figure 9 – Examples of surface irregularities ........................................................................ 21

Figure 10 – Chips on mating surfaces ................................................................................... 22

Figure 11 – Location of cracks – Top view ............................................................................ 24

Figure 12 – Location of cracks – Bottom view ....................................................................... 24

Figure 13 – Dimension W ...................................................................................................... 26

Figure 14 – Location of pull-out ............................................................................................. 26

Figure 15 – Pull-out in the clamping recess area ................................................................... 27

Figure 16 – Location of a crystallite ...................................................................................... 27

Figure 17 – Location of a flash .............................................................................................. 28

Figure 18 – Location of pore ................................................................................................. 28

Figure B.1 – Mounting device................................................................................................ 31

Table 1 – Dimensions of RM-cores ......................................................................................... 9

Table 2 – Dimensions of low-profile RM-cores ...................................................................... 10

Table 3 – Effective parameter and A values for RM-cores ................................................ 11

min

Table 4 – Effective parameter and A values for low-profile RM-cores............................... 12

min

Table 5 – Dimensions of spring recess .................................................................................. 13

Table 6 – Dimensions of stud recess .................................................................................... 13

Table 7 – Dimensional limits for coil formers for RM-cores .................................................... 14

Table 8 – Dimensional limits for coil formers for low-profile RM-cores ................................... 15

Table 9 – Dimensions of specific features ............................................................................. 19

Table 10 – Area and length reference of irregularities for visual inspection ........................... 23

Table 11 – Limits for cracks .................................................................................................. 25

Table 12 – W dimensions ...................................................................................................... 25

Table B.1 – Inner diameters and recommended clamping forces ........................................... 32

Table C.1 – Examples of allowable area of chips .................................................................. 33

---------------------- Page: 5 ----------------------
– 4 – IEC 63093-4:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES –
GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES
Part 4: RM-cores
FOREWORD

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

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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 63093-4 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 62317-4 published in 2005 and

the second edition of IEC 60424-2 published in 2015. This edition constitutes a technical

revision.

This edition includes the following significant technical changes with respect to

IEC 62317-4:2005 and IEC 60424-2:2015:
a) IEC 63093-4 integrates the contents of IEC 62317-4:2005 and IEC 60424-2:2015;
b) IEC 60424-2:2015, Table 2, has been included in Annex C as Table C.1.
---------------------- Page: 6 ----------------------
IEC 63093-4:2019 © IEC 2019 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
51/1265/FDIS 51/1275/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.
---------------------- Page: 7 ----------------------
– 6 – IEC 63093-4:2019 © IEC 2019
FERRITE CORES –
GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES
Part 4: RM-cores
1 Scope

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

interchangeability for a preferred range of RM-cores and low-profile RM-cores made of ferrite,

and the locations of their terminal pins on a 2,54 mm printed wiring grid in relation to the base

outlines of the cores. It also gives guidance on allowable limits of surface irregularities

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

The selection of core sizes 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.

This document is a specification useful in the negotiations between ferrite core manufacturers

and customers about surface irregularities.

The general considerations that the design of this range of cores is based upon 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 63093-4:2019 © IEC 2019 – 7 –
4 Primary dimensions
4.1 General

Compliance with the following requirements ensures mechanical interchangeability of

complete assemblies and wound coil formers.
4.2 Dimensions of RM-cores
4.2.1 Principal dimensions

The principal dimensions of RM-cores shall be as given in Table 1 and those of the low-profile

RM-cores shall be as given in Table 2. See also Figure 1 and Figure 2.
4.2.2 Effective parameter and A values
min

The effective parameter values for cores having the dimensions given in 4.2.1 are as shown in

Table 3 and Table 4. The definitions of effective parameters and their calculations shall be as

given in IEC 60205.
4.3 Main dimensions for coil formers
4.3.1 Shape of coil former and pin numbering

When the coil former is viewed from the pin side, the pins shall be numbered in a clockwise

direction. Pin 1 shall be a corner pin, or the pin immediately to the right of a corner, and

closest to the base outline.

For asymmetrical arrangements, pin 1 shall be at the side with the largest number of pins.

The coil former shall show an asymmetry, which shall preferably be visible (or detectable)

when the assembled inductor is held with the pins downwards. This asymmetry shall clearly

indicate pin 1. For pin numbering of recommended core patterns and for recommended

asymmetrical pin arrangements, see 4.4.
NOTE It is not required that the pin numbers be marked on the coil former.
4.3.2 Dimensions of coil formers for RM-cores for the primary standard
The dimensions specified in Table 7 and Table 8 are illustrated in Figure 5.
4.3.3 RM-cores intended particularly for power applications

These coil formers are intended for use with cores RM 6-S, RM 8, RM 10, RM 12 and RM 14A,

all without centre holes. Each is provided with twelve terminal pins except for the RM 6-S coil

former, which has only eight.

Figure 7 shows the features specific to this format and the corresponding dimensions are

given in Table 9.
4.4 Pin locations and base outlines

These shall be as shown in Figure 6 and Figure 8 (for power applications), in which the base

is viewed from the pin side, i.e. from the underside of the printed wiring boards.

The pins should fit into holes, the nominal hole diameter being:
• 1 mm when the shortest distance between pins is 2,54 mm;
• 1,3 mm when the shortest distance between pins is 2,54 mm or more.
---------------------- Page: 9 ----------------------
– 8 – IEC 63093-4:2019 © IEC 2019
4.5 Spring recess

RM-cores usually have recesses that allow the core halves to be held together by two spring

clamps snapping into these recesses. The recesses consist of a flat spring rest and a locking

ridge. The dimensions are given in Table 5 and Figure 3; the profile of this spring recess is

not defined but the limit dimensions shall be complied with.
4.6 Stud recess

Those RM-cores with centre-pole holes may have recesses for the fixed part of the adjusting

device with dimensions in accordance with Table 6 and Figure 4. These dimensions are not

mandatory for manufacturers who supply cores with the fixed part of the adjusting device

attached
---------------------- Page: 10 ----------------------
IEC 63093-4:2019 © IEC 2019 – 9 –
Figure 1 – Dimensions of RM-cores
Table 1 – Dimensions of RM-cores
A B C D E F G H J R
mm mm mm
Size mm mm mm mm mm mm mm Type

Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Max. Min. Max. Max.

RM 4 10,6 11,8 5,15 5,25 4,40 4,60 3,50 3,70 7,95 8,35 3,70 3,90 5,80 2,0 2,1 9,40 9,80 0,3 3

RM 5 14,0 14,9 5,15 5,25 6,40 6,80 3,15 3,35 10,20 10,60 4,70 4,90 6,00 2,0 2,1 11,80 12,30 0,3 3

RM 6-S 17,2 18,3 6,15 6,25 7,80 8,20 4,00 4,20 12,40 12,90 6,10 6,40 8,40 3,0 3,1 14,10 14,70 0,3 1

RM 6-R 17,2 18,3 6,15 6,25 7,00 7,40 4,00 4,20 12,40 12,90 6,10 6,40 6,30 3,0 3,1 14,10 14,70 0,3 4

RM 7 19,5 20,3 6,65 6,75 6,95 7,25 4,20 4,45 14,75 15,40 6,95 7,25 9,30 3,0 3,1 16,50 17,20 0,3 2

RM 8 22,3 23,2 8,15 8,25 10,60 11,00 5,40 5,65 17,00 17,70 8,25 8,55 9,50 4,4 4,6 18,90 19,70 0,3 3

RM 10 27,2 28,5 9,25 9,35 13,00 13,50 6,20 6,50 21,20 22,10 10,50 10,90 10,90 5,4 5,6 23,60 24,70 0,3 3

RM 12 36,1 37,4 12,20 12,30 15,60 16,10 8,40 8,70 25,00 26,00 12,30 12,80 12,90 - - 28,70 29,80 0,3 3

RM 14 40,8 42,2 14,40 14,50 18,40 19,00 10,40 10,70 29,00 30,20 14,40 15,00 17,00 5,4 5,6 33,50 34,70 0,3 3

RM 14A 40,8 42,2 15,00 15,10 18,40 19,00 10,40 10,70 29,00 30,20 14,40 15,00 17,00 - - 33,50 34,70 0,3 3

Solid centre-pole cores are available for each size.
---------------------- Page: 11 ----------------------
– 10 – IEC 63093-4:2019 © IEC 2019
Figure 2 – Dimensions of low-profile RM-cores
Table 2 – Dimensions of low-profile RM-cores
A B C D E F G H J R
Size mm mm mm mm mm mm mm mm mm mm Type

Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Max. Min. Max. Max.

RM 4/8 10,6 11,8 3,80 3,90 4,40 4,60 2,15 2,35 7,95 8,35 3,70 3,90 5,80 2,0 2,1 9,40 9,80 0,3 3

RM 5/8 14,0 14,9 3,80 3,90 6,40 6,80 1,80 2,00 10,20 10,60 4,70 4,90 6,00 2,0 2,1 11,80 12,30 0,3 3

RM 6/9 17,2 18,3 4,40 4,50 7,80 8,20 2,25 2,45 12,40 12,90 6,10 6,40 8,40 3,0 3,1 14,10 14,70 0,3 1

RM 7/10 19,5 20,3 4,80 4,90 6,95 7,25 2,35 2,60 14,75 15,40 6,95 7,25 9,30 3,0 3,1 16,50 17,20 0,3 2

RM 8/11 22,3 23,2 5,70 5,80 10,60 11,00 2,95 3,15 17,00 17,70 8,25 8,55 9,50 4,4 4,6 18,90 19,70 0,3 3

RM 10/13 27,2 28,5 6,40 6,50 13,00 13,50 3,35 3,55 21,20 22,10 10,50 10,90 10,90 5,4 5,6 23,60 24,70 0,3 3

RM 12/17 36,1 37,4 8,30 8,40 15,60 16,10 4,50 4,75 25,00 26,00 12,30 12,80 12,90 5,4 5,6 28,70 29,80 0,3 3

RM 14/20 40,8 42,2 10,15 10,25 18,40 19,00 5,55 5,85 29,00 30,20 14,40 15,00 17,00 5,4 5,6 33,50 34,70 0,3 3

Solid centre-pole cores are available for each size.
---------------------- Page: 12 ----------------------
IEC 63093-4:2019 © IEC 2019 – 11 –
Table 3 – Effective parameter and A values for RM-cores
min
with hole ○ C C A l V A
1 2 e e e min
Size
-1 -3 -3 2 3 2
no hole Φ mm × 10 mm mm mm mm mm
○ 1,874 3 171,63 10,9 20,5 224 8,04
RM 4
Φ 1,617 3 115,43 14,0 22,7 318 11,3
○ 1,021 5 50,075 20,4 20,8 425 14,8
RM 5
Φ 0,943 62 39,983 23,6 22,3 526 18,1
○ 0,897 83 29,592 30,3 27,2 830 23,4
RM 6-S
Φ 0,816 68 23,099 35,4 28,9 1 020 30,7
○ 0,821 49 25,728 31,3 25,7 810 23,4
RM 6-R
Φ 0,740 34 19,737 37,5 27,8 1 040 30,7
○ 0,720 27 17,389 41,4 29,8 1 240 32,3
RM 7
Φ 0,672 53 14,509 46,4 31,2 1 450 39,6
○ 0,680 17 13,134 51,8 35,2 1 820 39.5
RM 8
Φ 0,602 06 9,546 4 63,1 38,0 2 390 55,4
○ 0,503 89 6,034 9 83,5 42,1 3 510 66,2
RM 10
Φ 0,454 85 4,647 8 97,9 44,5 4 360 89,9
RM 12 Φ 0,383 33 2,626 6 146 55,9 8 160 124
○ 0,381 70 2,187 8 174 66,6 11 600 146
RM 14
Φ 0,362 17 1,918 9 189 68,4 12 900 170
RM 14A Φ 0,350 29 1,771 1 198 69,3 13 700 170

The manufacturers may indicate in their catalogues more precise values than those given in the above table.

See IEC 60205 for the definition of A .
min
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– 12 – IEC 63093-4:2019 © IEC 2019
Table 4 – Effective parameter and A values for low-profile RM-cores
min
with hole ○ C C A l V A
1 2 e e e min
Size
-1 -3 -3 2 3 2
no hole Φ mm × 10 mm mm mm mm mm
○ 1,377 4 120,26 11,5 15,8 181 8,04
RM 4/8
Φ 1,218 7 84,830 14,4 17,5 252 11,3
○ 0,748 11 34,680 21,6 16,1 348 14,8
RM 5/8
Φ 0,703 52 28,678 24,5 17,3 423 18,1
○ 0,656 34 20,781 31,6 20,7 655 23,4
RM 6/9
Φ 0,
...

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