Magnetic powder cores - Guidelines on dimensions and the limits of surface irregularities - Part 1: General specification

IEC 63182-1:2020 specifies the dimensions of magnetic powder cores. This document also gives guidelines on the allowable limits of surface irregularities of magnetic powder cores. It is considered as a general specification useful in the dialogue between magnetic powder core manufacturers and users about surface irregularities.
It is intended that this document will include magnetic powder cores which are widely used and referenced in industry, either because they are included in national standards, or because they are seen to have broad-based use in industry. Where applicable, it is intended that the existing industrial name for each powder core will appear with the part within the IEC 63182 series.

Noyaux en poudre magnétique - Lignes directrices concernant les dimensions et les limites des irrégularités de surface - Partie 1: Spécification générale

L'IEC 63182-1:2020 spécifie les dimensions des noyaux en poudre magnétique. Le présent document spécifie également des lignes directrices concernant les limites admissibles des irrégularités de surface des noyaux en poudre magnétique. Il convient de considérer ces lignes directrices comme une spécification générale utile dans le dialogue entre les fabricants et les utilisateurs des noyaux en poudre magnétique portant sur les irrégularités de surface. Il est prévu que le présent document inclue les noyaux en poudre magnétique largement utilisés et référencés dans le secteur industriel, soit parce qu’ils sont inclus dans des normes nationales, soit du fait de leur emploi réputé généralisé dans ledit secteur. Le cas échéant, il convient que le nom industriel existant pour chaque noyau en poudre magnétique apparaisse avec la partie dans la série de normes IEC 63182.

General Information

Status
Published
Publication Date
26-May-2020
Current Stage
PPUB - Publication issued
Completion Date
27-May-2020
Ref Project

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IEC 63182-1
Edition 1.0 2020-05
INTERNATIONAL
STANDARD
Magnetic powder cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 1: General specification
IEC 63182-1:2020-05(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2020 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

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variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English

committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
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once a month by email. French extracted from the Terms and Definitions clause of

IEC publications issued since 2002. Some entries have been

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If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
---------------------- Page: 2 ----------------------
IEC 63182-1
Edition 1.0 2020-05
INTERNATIONAL
STANDARD
Magnetic powder cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 1: General specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-8379-0

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 63182-1:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

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

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

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

4 Locations and functions of core parts and surfaces.......................................................... 7

4.1 Mating surface ........................................................................................................ 7

4.2 Centre leg or centre pole ....................................................................................................... 7

4.3 Outer walls or legs ................................................................................................................. 7

4.4 Back wall, bottom and back surfaces .................................................................................... 7

5 Dimensions descriptions .................................................................................................. 8

6 Limits of surface irregularities ........................................................................................ 10

6.1 Surface irregularities of uncoated cores ................................................................ 10

6.1.1 Chips and ragged edges ................................................................................ 10

6.1.2 Cracks ........................................................................................................... 10

6.1.3 Flash ............................................................................................................. 10

6.1.4 Scratch .......................................................................................................... 10

6.1.5 Rust............................................................................................................... 10

6.1.6 Discoloration ................................................................................................. 10

6.2 Surface irregularities of coated cores .................................................................... 10

6.2.1 Peeling .......................................................................................................... 10

6.2.2 Pinholes ........................................................................................................ 10

6.2.3 Bubble ........................................................................................................... 10

6.2.4 Coating tip ..................................................................................................... 10

6.2.5 Unevenness................................................................................................... 10

Annex A (informative) Area and length reference for visual inspection ................................. 11

Annex B (informative) Anticipated sectional specifications ................................................... 13

Figure 1 – Location of main core parts and surfaces – Example of E-core type ....................... 8

Figure 2 – Block-core and ellipse-core dimensions designations ............................................. 8

Figure 3 – Cylinder-core dimensions designations .................................................................. 9

Figure 4 – EQ-core dimensions designations .......................................................................... 9

Table 1 – Block-core and ellipse-core dimensions designations .............................................. 8

Table 2 – Cylinder-core dimensions designations ................................................................... 9

Table 3 – EQ-core dimensions designations ........................................................................... 9

Table A.1 – Area and length reference for visual inspection .................................................. 12

Table B.1 – Anticipated sectional specifications in the IEC 63182 series ............................... 13

---------------------- Page: 4 ----------------------
IEC 63182-1:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC POWDER CORES – GUIDELINES ON
DIMENSIONS AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 1: General specification
FOREWORD

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

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

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 63182-1 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:
CDV Report on voting
51/1324/CDV 51/1340/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 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.
---------------------- Page: 5 ----------------------
– 4 – IEC 63182-1:2020 © IEC 2020

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 63182-1:2020 © IEC 2020 – 5 –
INTRODUCTION
Magnetic powder core materials
...

IEC 63182-1
Edition 1.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic powder cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 1: General specification
Noyaux en poudre magnétique – Lignes directrices concernant les dimensions
et les limites des irrégularités de surface –
Partie 1: Spécification générale
IEC 63182-1:2020-05(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2020 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

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About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,

variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English

committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
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Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary

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IEC publications issued since 2002. Some entries have been

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If you wish to give us your feedback on this publication or CISPR.
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---------------------- Page: 2 ----------------------
IEC 63182-1
Edition 1.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic powder cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 1: General specification
Noyaux en poudre magnétique – Lignes directrices concernant les dimensions
et les limites des irrégularités de surface –
Partie 1: Spécification générale
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-8819-1

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 63182-1:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

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

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

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

4 Locations and functions of core parts and surfaces.......................................................... 7

4.1 Mating surface ........................................................................................................ 7

4.2 Centre leg or centre pole ....................................................................................................... 7

4.3 Outer walls or legs ................................................................................................................. 7

4.4 Back wall, bottom and back surfaces .................................................................................... 7

5 Dimensions descriptions .................................................................................................. 8

6 Limits of surface irregularities ........................................................................................ 10

6.1 Surface irregularities of uncoated cores ................................................................ 10

6.1.1 Chips and ragged edges ................................................................................ 10

6.1.2 Cracks ........................................................................................................... 10

6.1.3 Flash ............................................................................................................. 10

6.1.4 Scratch .......................................................................................................... 10

6.1.5 Rust............................................................................................................... 10

6.1.6 Discoloration ................................................................................................. 10

6.2 Surface irregularities of coated cores .................................................................... 10

6.2.1 Peeling .......................................................................................................... 10

6.2.2 Pinholes ........................................................................................................ 10

6.2.3 Bubble ........................................................................................................... 10

6.2.4 Coating tip ..................................................................................................... 10

6.2.5 Unevenness................................................................................................... 10

Annex A (informative) Area and length reference for visual inspection ................................. 11

Annex B (informative) Anticipated sectional specifications ................................................... 13

Figure 1 – Location of main core parts and surfaces – Example of E-core type ....................... 8

Figure 2 – Block-core and ellipse-core dimensions designations ............................................. 8

Figure 3 – Cylinder-core dimensions designations .................................................................. 9

Figure 4 – EQ-core dimensions designations .......................................................................... 9

Table 1 – Block-core and ellipse-core dimensions designations .............................................. 8

Table 2 – Cylinder-core dimensions designations ................................................................... 9

Table 3 – EQ-core dimensions designations ........................................................................... 9

Table A.1 – Area and length reference for visual inspection .................................................. 12

Table B.1 – Anticipated sectional specifications in the IEC 63182 series ............................... 13

---------------------- Page: 4 ----------------------
IEC 63182-1:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC POWDER CORES – GUIDELINES ON
DIMENSIONS AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 1: General specification
FOREWORD

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

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

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 63182-1 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:
CDV Report on voting
51/1324/CDV 51/1340/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 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.
---------------------- Page: 5 ----------------------
– 4 – IEC 63182-1:2020 © IEC 2020

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 63182-1:2020 © IEC 2020 – 5 –
INTRODUCTION

Magnetic powder core materials are distinct from ferrite materials. Whereas ferrites are

homogeneous ceramic oxides, powder cores are heterogeneous magnetic alloys. Alloys which

can include iron, nickel and other additives are prepared in fine powder form. The powder

particles are insulated with non-conductive materials, and the resulting heterogeneous structure

is formed by compaction into a core shape, such as a ring.

Magnetic powder cores are suitable for use in inductors. They are characterized by low

permeability, resistance to saturation under the influence of high currents, high flux densities,

high Curie temperatures, as well as soft saturation, which is controlled, and gradual reduction

in inductance with increasing DC bias field, even to very high levels of bias.

The commonly used magnetic powder core materials are pure iron (Fe), iron-silicon-aluminium

(FeSiAl), iron-silicon (FeSi), iron-nickel (FeNi), iron-nickel-molybdenum (FeNiMo), iron-silicon-

chromium (FeSiCr), iron-based amorphous powder (FeSiB) and iron-based nanocrystalline

(FeCuNbSiB) powder.

Compliance with the requirements in the sectional specifications ensures basic mechanical

interchangeability of complete assemblies and wound coils. The differences in loss, DC bias,

and frequency response performance among materials, and among manufacturers, are

significant, even though size and permeability can be identical for parts under comparison.

Due to the method of manufacture and the physical nature of the products, magnetic powder

cores can be expected to exhibit some degree of physical irregularities such as chips and

ragged edges, cracks, flash, scratch, rust and discoloration. For coated cores some coating

layer defects such as peeling, pinholes, bubbles, coating tips and unevenness can occur.

The permissible extent of these surface irregularities will depend on the type, position and size

of the irregularity and on the function of the core. Thus, in order to establish limits of surface

irregularities for a given series of magnetic powder cores, for example ring-cores, block-cores,

cylinder-cores, ellipse-cores, E-cores, EQ-cores, EER-cores, U-cores and pot-cores, a

particular specification for each should be prepared, setting out in detail the permissible extent

of the various types of irregularities. The irregularities are considered as being detectable

without the use of any magnifying equipment. An area and length reference for visual inspection

is shown in Annex A.

In each particular specification relevant to a standardized core series, general rules for the

calculation of limits should be defined for every kind of irregularity and for all core parts and

surfaces.

For guidance on the limits of irregularities, refer to the sectional specifications of the IEC 63182

series, where limits according to core size are given in suitable tables, along with identification

of irregularity types on figures and drawings.

The anticipated sectional specifications in the IEC 63182 series are shown in Annex B.

---------------------- Page: 7 ----------------------
– 6 – IEC 63182-1:2020 © IEC 2020
MAGNETIC POWDER CORES – GUIDELINES ON
DIMENSIONS AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 1: General specification
1 Scope
This part of IEC 63182 specifies the dimensions of magnetic powder cores.

It is intended that this document will include magnetic powder cores which are widely used and

referenced in industry, either because they are included in national standards, or because they

are seen to have broad-based use in industry. Where applicable, it is intended that the existing

industrial name for each powder core will appear with the part within the IEC 63182 series.

This document also gives guidelines on the allowable limits of surface irregularities of magnetic

powder cores. It is considered as a general specification useful in the dialogue 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 60401-1, Terms and nomenclature for cores made of magnetically soft ferrites – Part 1:

Terms used for physical irregularities and reference of dimensions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60401-1 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
scratch
one or more scrapes caused by the handling process
rust

corrosion spots on the surface of an uncoated core caused by the action of oxygen and water

in air
peeling

absence of some part of the coating layer resulting in the exposure of the bare core due to the

failure of the coating to adhere to the substrate surface
---------------------- Page: 8 ----------------------
IEC 63182-1:2020 © IEC 2020 – 7 –
pinhole
fine size hole (diameter less than 1,5 mm) on the coating layer
bubble
lifting of the coating from the core surface
coating tip

sharp point that develops in the surface during application or curing of the coating

unevenness
partial convexity or attached foreign matter on the coating layer
4 Locations and functions of core parts and surfaces
Mating surface

Some mating surfaces have been ground in order to reduce the residual air gap between the

two core halves or between the adjacent assembled pieces. Others have not been ground, but

should have sufficient flatness to maintain the specified electrical performance.

Centre leg or centre pole

The centre leg carries the total flux generated by the winding. It is called centre leg when

rectangular as in Figure 1, and it is called centre pole (or centre post) when round as in a pot-

core.

A centre leg (or centre pole) gap can be intentionally added either during the pressing of the

magnetic powder core or as a secondary operation to provide two main functions. First, if no

grinding of the mating surface is to be performed, the centre leg gap will eliminate any outer

leg gap that could cause a pair of cores to mechanically rock. Second, the centre leg gap can

be used to control electrical performance by tightly controlling inductance and the response of

inductance to a DC bias field.
Outer walls or legs

The outer walls (e.g. pot-cores) or the outer legs (e.g. E-cores) guide the magnetic flux in a

closed magnetic circuit.
Back wall, bottom and back surfaces

The back wall has the same magnetic function as the outer walls or legs. The back surface

(ground or not) serves as a reference plane for grinding the mating surface in order to achieve

the required electrical performance, parallelism, and flatness. The bottom surface is the interior

plane of the back wall, facing the coil.
---------------------- Page: 9 ----------------------
– 8 – IEC 63182-1:2020 © IEC 2020
Figure 1 – Location of main core parts and surfaces – Example of E-core type
5 Dimensions descriptions

The alphabetic character assignments for the major dimensions of various core shapes are

designated and illustrated in IEC 60401-1. For block-cores and ellipse-cores, the dimensions

designations are described in Table 1 and Figure 2, for cylinder-cores, in Table 2 and Figure 3,

and for EQ-cores, in Table 3 and Figure 4. All other minor core dimension designations are left

to the discretion of the specifier.

Industry convention uses the term "ellipse-cores" even though the shape is not actually elliptical,

but rather rectangular with semi-circular ends. Industry convention also uses the term "EQ-

cores" for the same powder core geometry that is called "planar ER-cores" for ferrite cores in

IEC 60401-1.
Table 1 – Block-core and ellipse-core dimensions designations
Letter Dimension description
A Length of block or ellipse
B Width of block or ellipse
C Height or thickness of block or ellipse
R Radius of ellipse end
Figure 2 – Block-core and ellipse-core dimensions designations
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IEC 63182-1:2020 © IEC 2020 – 9 –
Table 2 – Cylinder-core dimensions designations
Letter Dimension description
A Cylinder diameter
B Cylinder height
Figure 3 – Cylinder-core dimensions designations
Table 3 – EQ-core dimensions designations
Letter Dimension description
A Overall length of the core back
B Core height
C Core width
D Available winding depth
E Available winding diameter
F Centre pole diameter
G Wire-opening width
Figure 4 – EQ-core dimensions designations
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– 10 – IEC 63182-1:2020 © IEC 2020
6 Limits of surface irregularities
6.1 Surface irregularities of uncoated cores
6.1.1 Chips and ragged edges

The simplest way of performing inspection on these two types of irregularities is to compare a

chip to a reference area limit and a ragged edge to a reference length limit.

The limits of chips are generally defined as a percentage of the related surface of the core.

The apparent area of a chip is considered to be the area of that chip.

The ragged edge length is generally limited to a percentage of the common perimeter of the

respective two surfaces.
6.1.2 Cracks

The limits of cracks are generally defined as a percentage of the specified core section

thickness.

The length of a crack is considered to be the actual length visible on the surface without

magnification.
6.1.3 Flash

Generally, no limit is defined but the critical places where flash is not allowed should be listed.

6.1.4 Scratch

The limits of scratches are generally defined as a percentage of the respective surface area or

a percentage of the reference size.
6.1.5 Rust

The limits of rust are generally defined as a percentage of the respective surface area.

6.1.6 Discoloration
Generally, no limit is defined.
6.2 Surface irregularities of coated cores
6.2.1 Peeling
Generally, peeling is not allowed.
6.2.2 Pinholes
The limits of pinholes are generally defined by the number of them.
6.2.3 Bubble
Any coating bubble is unacceptable.
6.2.4 Coating tip
Any coating tip is unacceptable.
6.2.5 Unevenness

The limit of unevenness is generally defined as a percentage of the respective surface area.

The dimension after coating shall be within the published dimension limit.
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IEC 63182-1:2020 © IEC 2020 – 11 –
Annex A
(informative)
Area and length reference for visual inspection

Irregularities such as chips, cracks, scratches, rust and unevenness should be compared to five

simple geometries which are shown in Table A.1.

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.

NOTE The minimum area and length considered are respectively 0,5 mm and 1 mm.
Recommended resolutions are as follows:
a) 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
b) for length
– 1 mm from 1 mm to 5 mm
– 2,5 mm from 5 mm to 10 mm
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– 12 – IEC 63182-1:2020 © IEC 2020
Table A.1 – Area and length reference for visual inspection
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IEC 63182-1:2020 © IEC 2020 – 13 –
Annex B
(informative)
Anticipated sectional specifications
Table B.1 – Anticipated sectional specifications in the IEC 63182 series
General title Part title
Part 2: Ring-cores
Part 3: E-cores
Part 4: Block-cores
Part 5: Cylinder-cores
Magnetic powder cores – Guidelines on
Part X: Ellipse-cores
dimensions and the limits of surface
Part X: EQ-cores
irregularities –
Part X: EER-cores
Part X: U-cores
Part X: Pot-cores
____________
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– 14 – IEC 63182-1:2020 © IEC 2020
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 15

INTRODUCTION ................................................................................................................... 17

1 Domaine d’application ................................................................................................... 18

2 Références normatives .................................................................................................. 18

3 Termes et définitions ..................................................................................................... 18

4 Emplacements et fonctions des parties et surfaces de noyaux ....................................... 19

4.1 Surface magnétiquement active ............................................................................ 19

4.2 Jambe centrale ou pôle central ............................................................................. 19

4.3 Parois ou jambes extérieures ................................................................................ 19

4.4 Paroi du fond, surfaces du bas et surfaces du fond ............................................... 19

5 Descriptions des dimensions ......................................................................................... 20

6 Limites des irrégularités de surface ............................................................................... 22

6.1 Irrégularités de surface des noyaux non revêtus ................................................... 22

6.1.1 Éclats et bords ébréchés ............................................................................... 22

6.1.2 Fissures ........................................................................................................ 22

6.1.3 Bavure ........................................................................................................... 22

6.1.4 Rayure ....................................
...

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