Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 3: Half pot-cores made of ferrite for inductive proximity switches

IEC 63093-3:2020 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of half pot-cores made of ferrite, intended to be used in inductive proximity switches. Half pot-cores for inductive proximity switches are also called PS-cores.
The selection of core sizes and shapes for this document is based on the philosophy of including those sizes and shapes which are industrial standards, either by inclusion in a national standard, or by broad-based use in industry.
This part of IEC 63093 can also be considered as a sectional specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities. It provides guidelines on the allowable limits of surface irregularities applicable to PS-cores in accordance with the relevant generic specification.
This first edition cancels and replaces the first edition of IEC 62323, published in 2005. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition of IEC 62323:
a) addition of the limits surface irregularities.

Noyaux ferrites - Lignes directrices relatives aux dimensions et limites des irrégularités de surface - Partie 3: Demi-circuits magnétiques en ferrite pour des commutateurs inductifs de proximité

L'IEC 63093-3:2020 spécifie les dimensions importantes pour l'interchangeabilité mécanique d'une gamme préférentielle de demi-circuits magnétiques en pot en ferrite, destinée à être utilisée dans des commutateurs inductifs de proximité. Les demi-circuits magnétiques en pots des commutateurs inductifs de proximité sont également appelés noyaux PS.
Le choix des tailles et formes de noyau pour le présent document repose sur la philosophie consistant à introduire les tailles et formes qui correspondent à des normes industrielles, soit dans une norme nationale soit par une utilisation à grande échelle dans le secteur industriel.
La présente partie de l'IEC 63093 peut être considérée comme une spécification intermédiaire utile dans les négociations tenues entre les fabricants de noyaux ferrites et les clients concernant les irrégularités de surface. Elle donne les lignes directrices relatives aux limites acceptables des irrégularités de surface applicables aux noyaux PS conformément à la spécification générique correspondante.
Cette première édition annule et remplace la première édition de l'IEC 62323 parue en 2005. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente de l'IEC 62323:
a) ajout des limites des irrégularités de surface.

General Information

Status
Published
Publication Date
26-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
27-Mar-2020
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IEC 63093-3
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 3: Half pot-cores made of ferrite for inductive proximity switches
Noyaux ferrites – Lignes directrices relatives aux dimensions et limites
des irrégularités de surface –
Partie 3: Demi-circuits magnétiques en pots en ferrite pour des commutateurs
inductifs de proximité
IEC 63093-3 :2020-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63093-3
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 3: Half pot-cores made of ferrite for inductive proximity switches
Noyaux ferrites – Lignes directrices relatives aux dimensions et limites
des irrégularités de surface –
Partie 3: Demi-circuits magnétiques en pots en ferrite pour des commutateurs
inductifs de proximité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ISBN 978-2-8322-8009-6
ICS 29.100.10

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 63093-3:2020 © IEC 2020
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 Nomenclature of dimensions ................................................................................... 6

4.3 Dimensions of PS-cores .......................................................................................... 7

4.4 Requirements ......................................................................................................... 8

4.5 Marking ................................................................................................................... 8

5 Limits of surface irregularities .......................................................................................... 8

5.1 General ................................................................................................................... 8

5.2 Examples of surface irregularities .......................................................................... 8

5.3 Chips and ragged edges ......................................................................................... 9

5.4 Cracks .................................................................................................................. 11

5.5 Pull-out, crystallite and pore locations for PS-cores .............................................. 12

5.6 Flash .................................................................................................................... 12

Bibliography .......................................................................................................................... 14

Figure 1 – Fundamental types of PS-cores ............................................................................. 6

Figure 2 – Nomenclature of dimensions .................................................................................. 7

Figure 3 – Examples of surface irregularities .......................................................................... 9

Figure 4 – Chips and ragged edge on the surfaces ................................................................. 9

Figure 5 – Cracks location – Top view .................................................................................. 11

Figure 6 – Cracks location – Bottom view ............................................................................. 11

Figure 7 – Pull-out, crystallite and pore locations .................................................................. 12

Figure 8 – Flash location....................................................................................................... 13

Figure 9 – Flash location in the wire hole .............................................................................. 13

Table 1 – Dimensions of PS-cores .......................................................................................... 8

Table 2 – Area and length references of irregularities for visual inspection ........................... 10

Table 3 – Limits for cracks .................................................................................................... 12

---------------------- Page: 4 ----------------------
IEC 63093-3:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 3: Half pot-cores made of ferrite
for inductive proximity switches
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 63093-3 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 62323, published in 2005. This

edition constitutes a technical revision.

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

edition of IEC 62323:
a) addition of the limits surface irregularities.
---------------------- Page: 5 ----------------------
– 4 – IEC 63093-3:2020 © IEC 2020
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1300/CDV 51/1323/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: 6 ----------------------
IEC 63093-3:2020 © IEC 2020 – 5 –
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 3: Half pot-cores made of ferrite
for inductive proximity switches
1 Scope

This part of IEC 63093-3 specifies the dimensions that are of importance for mechanical

interchangeability for a preferred range of half pot-cores made of ferrite, intended to be used

in inductive proximity switches. Half pot-cores for inductive proximity switches are also called

PS-cores.

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

including those sizes and shapes which are industrial standards, either by inclusion in a

national standard, or by broad-based use in industry.

This part of IEC 63093 can also be considered as a sectional specification useful in the

negotiations between ferrite core manufacturers and customers about surface irregularities. It

provides guidelines on the allowable limits of surface irregularities applicable to PS-cores in

accordance with the relevant generic specification.
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 60401-1, Terms and nomenclature for cores made of magnetically soft ferrites – Part 1:

Terms used for physical irregularities

IEC 60424-1:2015, 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

PS-cores are primarily suited for use in inductive proximity switches. The design of PS-cores

is guided by the following considerations:
---------------------- Page: 7 ----------------------
– 6 – IEC 63093-3:2020 © IEC 2020

– the ratio of the thickness of the outer wall to the thickness of the back wall is preferably

1:1;

– the location, design and dimension of the wire-ways, holes and slots are made to easily

accommodate the leading connection wires out from the interior of the core;

– the diameter of the centre pole and centre pole hole is regulated by the type of sensor

application that can require a hole, a blind hole, or no hole.
Fundamental types of PS-cores are shown in Figure 1.

a) Slot rounded to lead wires b) Wiring led through holes in the c) Variable location of the slots

through the back back wall

d) Centre pole with blind hole e) Wire-way recess on the inner f) Connecting wiring via slots and

(dashed) bottom hole
Figure 1 – Fundamental types of PS-cores

The nomenclature of dimensions given in Figure 2 applies to all examples given in Figure 1.

4.2 Nomenclature of dimensions
The nomenclature of dimensions is shown in Figure 2.
---------------------- Page: 8 ----------------------
IEC 63093-3:2020 © IEC 2020 – 7 –
Figure 2 – Nomenclature of dimensions
4.3 Dimensions of PS-cores

Compliance with the following requirements ensures mechanical interchangeability of

complete assemblies and wound coil formers. The principal dimensions and tolerances of PS-

cores shall be as given in Table 1. See also Figure 2. Dimensions which are not specified in

Table 1 follow the agreement between manufacturers and users.
---------------------- Page: 9 ----------------------
– 8 – IEC 63093-3:2020 © IEC 2020
Table 1 – Dimensions of PS-cores
A B D E F
Core type Dimensions mm mm mm mm mm
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
PS 2,4 2,4 x 1,25 2,35 2,50 1,05 1,25 0,85 1,05 1,85 2,05 0,70 0,80
PS 3,3 3,3 x 1,3 3,20 3,35 1,10 1,30 0,85 1,05 2,45 2,65 1,10 1,20
a a
PS 4,6 4,6 x 2,05 4,40 4,60 1,90 2,05 1,35 1,50 3,70 3,90 2,05 2,20
PS 5,6 5,6 x 1,7 5,35 5,60 1,50 1,70 1,10 1,30 4,50 4,70 2,40 2,50
PS 7,35 7,35 x 3,6 7,10 7,35 3,40 3,60 2,80 3,00 5,80 6,00 2,85 3,00
PS 8,2 8,25 x 3,5 7,85 8,25 3,30 3,50 2,60 2,80 6,50 6,85 2,30 2,50
a a
PS 9,0 9,0 x 3,5 8,60 9,00 3,30 3,50 2,60 2,80 7,30 7,60 3,65 3,90
a a a a
PS 11 11,3 x 3,3 10,90 11,30 3,20 3,30 2,20 2,35 9,00 9,40 4,50 4,70
a a a
PS 14 14,3 x 4,25 13,80 14,30 4,10 4,25 2,80 3,00 11,60 12,00 5,80 6,00
a a a
PS 25 24,8 x 8,9 23,80 24,80 8,70 8,90 5,90 6,20 20,50 21,30 10,80 11,30
a a
PS 30,5 30,5 x 10,2 29,50 30,50 9,90 10,20 7,00 7,35 25,00 25,80 13,10 13,50
PS 35 35 x 10,8 34,00 35,00 10,45 10,80 7,20 7,60 29,40 30,20 15,20 15,70
PS 47 47 x 14 45,70 47,00 13,50 14,00 9,50 10,00 39,00 40,10 19,40 20,00
PS 68 68 x 14,5 65,80 68,00 13,90 14,50 9,00 9,60 57,50 59,30 28,50 29,50
A centre hole (H) is allowed.
Chamfers are allowed as long as they do not limit the winding space.

NOTE The core can have up to two slots in order to realize the wire connection feed-through holes.

The specified dimensional tolerances do not comply with IEC TR 63090.
4.4 Requirements

In order to avoid damage to the coils and their interconnection wires, the core shall be

delivered without flashes. Flashes according to 3.3 of IEC 60424-1:2015 shall not be present

either on the winding area limiting surfaces, including edges, or on the wire connection feed-

through holes.
4.5 Marking

A manufacturer specific marking should be clearly visible for types PS 7,35 and larger,

preferably on the back wall of the core.
5 Limits of surface irregularities
5.1 General
Surface irregularities are defined in IEC 60424-1.
5.2 Examples of surface irregularities
Figure 3 shows different examples of surface irregularities on a PS-core.
---------------------- Page: 10 ----------------------
IEC 63093-3:2020 © IEC 2020 – 9 –
Figure 3 – Examples of surface irregularities
5.3 Chips and ragged edges
The minimum area is taken as 0,5 mm , to be distinguishable to the naked eye.

The cumulative area of the chips located on the surface shall be less than 8 % of the surface

areas.

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

surface.

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

Figure 4).
Figure 4 – Chips and ragged edge on the surfaces

The area and length references of irregularities for visual inspection are given in Table 2.

---------------------- Page: 11 ----------------------
– 10 – IEC 63093-3:2020 © IEC 2020
Table 2 – Area and length references of irregularities for visual inspection
---------------------- Page: 12 ----------------------
IEC 63093-3:2020 © IEC 2020 – 11 –
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 5).

The limits of cracks at various locations shown in Figure 5 and Figure 6 are given in Table 3.

Figure 5 – Cracks location – Top view
Figure 6 – Cracks location – Bottom view
---------------------- Page: 13 ----------------------
– 12 – IEC 63093-3:2020 © IEC 2020
Table 3 – Limits for cracks
1 a
Type Location Limits for single crack Limits for multiple cracks
S1 , S1’/S1” Any place Not acceptable Not acceptable
b b
S2 , S2’ , S2” Centre-pole Centre-pole thickness Centre-pole thickness
S3 , S3' , S3” Outer wall Wall thickness 4 x wall thickness
S4 , S4’ Back surface Back wall thickness 4 x back wall thickness
Corner of centre-pole/back 25 % of centre-pole 25 % of centre-pole
wall circumference circumference
S5 , S5’
and outer wall/back wall 25 % of relevant arc 25 % of relevant arc
≤ 50 % of the back wall
S6 Wire slot Back wall thickness
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.

Centre-pole thickness is (F - H)/2. The length of a centre-pole crack when there is no centre-pole hole shall

be 20% or less of the centre-pole diameter (F).
5.5 Pull-out, crystallite and pore locations for PS-cores

Figure 7 shows an example of pull-out, crystallite and pore locations on the PS-core:

– the cumulative area of the 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 any crystallite 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;

– 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 pore with an area larger than 1 mm on any surface is not acceptable.
Figure 7 – Pull-out, crystallite and pore locations
5.6 Flash
Figure 8 and Figure 9 show examples of flash on the PS-core:
---------------------- Page: 14 ----------------------
IEC 63093-3:2020 © IEC 2020 – 13 –

– there shall be no flash extending from the core into the wire slot or the wire hole.

Figure 8 – Flash location
Figure 9 – Flash location in the wire hole
---------------------- Page: 15 ----------------------
– 14 – IEC 63093-3:2020 © IEC 2020
Bibliography
IEC 61332, Soft ferrite material classification

IEC 62044-1, Cores made of soft magnetic materials – Measuring methods – Part 1: Generic

specification

IEC 62044-2, Cores made of soft magnetic materials – Measuring methods – Part 2: Magnetic

properties at low excitation level

IEC 62044-3, Cores made of soft magnetic materials – Measuring methods – Part 3: Magnetic

properties at high excitation level
IEC 62317-1, Ferrite cores – Dimensions – Part 1: General specification

IEC 62317-2, Ferrite cores – Dimensions – Part 2: Pot-cores for use in telecommunications,

power supply, and filter applications
IEC TR 63090, Dimensional tolerances of ferrite cores
___________
---------------------- Page: 16 ----------------------
– 16 – IEC 63093-3:2020 © IEC 2020
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 17

1 Domaine d'application ................................................................................................... 19

2 Références normatives .................................................................................................. 19

3 Termes et définitions ..................................................................................................... 19

4 Dimensions primaires .................................................................................................... 20

4.1 Généralités ........................................................................................................... 20

4.2 Nomenclature des dimensions .............................................................................. 20

4.3 Dimensions des noyaux PS ................................................................................... 21

4.4 Exigences ............................................................................................................. 22

4.5 Marquage ............................................................................................................. 22

5 Limites des irrégularités de surface ............................................................................... 22

5.1 Généralités ........................................................................................................... 22

5.2 Exemples d'irrégularités de surface ...................................................................... 22

5.3 Éclats et bords ébréchés ....................................................................................... 23

5.4 Fissures ................................................................................................................ 25

5.5 Emplacement de collage, de cristallite et de pore sur les noyaux PS .................... 26

5.6 Bavure .................................................................................................................. 27

Bibliographie ......................................................................................................................... 28

Figure 1 – Principaux types de noyaux PS ............................................................................ 20

Figure 2 – Nomenclature des dimensions.............................................................................. 21

Figure 3 – Exemples d'irrégularités de surface ...................................................................... 23

Figure 4 – Éclats et bords ébréchés sur les surfaces ............................................................ 23

Figure 5 – Emplacement des fissures – Vue de dessus ......................................................... 25

Figure 6 – Emplacement des fissures – Vue de dessous ....................................................... 25

Figure 7 – Emplacements de collage, de cristallite et de pore ............................................... 26

Figure 8 – Emplacement de bavure ....................................................................................... 27

Figure 9 – Emplacement de bavure dans le trou pour câble .................................................. 27

Tableau 1 – Dimensions des noyaux PS ............................................................................... 22

Tableau 2 – Références de surface et de longueur des irrégularités pour examen

visuel .................................................................................................................................... 24

Tableau 3 – Limites des fissures ........................................................................................... 26

---------------------- Page: 17 ----------------------
IEC 63093-3:2020 © IEC 2020 – 17 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
NOYAUX FERRITES – LIGNES DIRECTRICES RELATIVES AUX
DIMENSIONS ET LIMITES DES IRRÉGULARITÉS DE SURFACE –
Partie 3: Demi-circuits magnétiques en pots en ferrite
pour des commutateurs inductifs de proximité
AVANT-PROPOS
1) La Commission Electrotechnique I
...

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