IEC 63093-7:2018

IEC 63093-7 ®
Edition 1.0 2018-03
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 7: EER-cores
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IEC 63093-7 ®
Edition 1.0 2018-03
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface

irregularities –
Part 7: EER-cores
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-5485-1

– 2 – IEC 63093-7:2018 © IEC 2018
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Primary dimensions . 6
4.1 General . 6
4.2 Dimensions of EER-cores . 7
4.2.1 Principal dimensions . 7
4.2.2 Effective parameter and A values . 8
min
4.3 Dimensional limits for coil formers. 8
5 Limits of surface irregularities . 9
5.1 General . 9
5.2 Chips and ragged edges . 10
5.2.1 General. 10
5.2.2 Chips and ragged edges on the mating surfaces (see Figure 4) . 10
5.2.3 Chips and ragged edges on the other surfaces (see Figure 4) . 10
5.3 Cracks . 12
5.4 Flash . 12
5.5 Pull-outs . 12
5.6 Crystallites . 13
5.7 Pores . 14
Annex A (normative) Derived standards . 15
Annex B (normative) Example of dimensions for gauges to check the dimensions of
EER-cores meeting this primary standard . 16
B.1 General . 16
B.2 Procedure and requirements . 16
Annex C (informative) Examples of allowable areas of chips . 17
Bibliography . 18

Figure 1 – Dimensions of EER-cores . 7
Figure 2 – Essential dimensions of coil formers . 8
Figure 3 – Examples of surface irregularities . 9
Figure 4 – Chip locations for EER-cores . 10
Figure 5 – Cracks and pull-out locations for EER-cores . 12
Figure 6 – Crystallite location for EER-cores . 13
Figure 7 – Pore location for EER-cores . 14
Figure B.1 – Gauge dimensions . 16

Table 1 – Dimensions of EER-cores . 7
Table 2 – Effective parameter values of EER-cores . 8

Table 3 – Dimensional limits for coil formers . 9
Table 4 – Area and length reference for visual inspection . 11
Table 5 – Limits for cracks . 13
Table B.1 – Gauge dimensions . 16
Table C.1 – Allowable areas of chips for EER-cores . 17

– 4 – IEC 63093-7:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES –

Part 7: EER-cores
FOREWORD
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International Standard IEC 63093-7 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 62317-7 published in 2005. This
edition constitutes a technical revision. This edition includes the following significant technical
changes with respect to IEC 62317-7:
a) IEC 63093-7 integrates IEC 62317-7 and IEC 60424-3;
b) IEC 60424-3:2015, Table 2, has been included in Annex C as Table C.1.

The text of this International Standard is based on the following documents:
FDIS Report on voting
51/1217/FDIS 51/1226/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.
A bilingual version of this publication may be issued at a later date.

– 6 – IEC 63093-7:2018 © IEC 2018
FERRITE CORES – GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES –

Part 7: EER-cores
1 Scope
This part of IEC 63093 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of EER-cores made of ferrite, the essential
dimensions of coil formers to be used with them as well the effective parameter values to be
used in calculations involving them, and gives guidelines on allowable limits of surface
irregularities applicable to EER-cores.
This document is a specification useful in the negotiations between ferrite core manufacturers
and customers about surface irregularities.
The use of “derived” standards which give more detailed specifications of component parts
while still permitting compliance with this document is di
...