IEC 63093-12:2019

IEC 63093-12 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –
Part 12: Ring-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 12: Noyaux toriques
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IEC 63093-12 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface irregularities –

Part 12: Ring-cores
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des

irrégularités de surface –
Partie 12: Noyaux toriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-6715-8

– 2 – IEC 63093-12:2019 © IEC 2019
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 Dimensions of ring-cores . 6
4.2.1 Designation of dimensions . 6
4.2.2 Identification of standard sizes . 6
4.2.3 Effective parameter values. 6
4.2.4 Dimensional limits for standard sizes . 7
4.3 Coating . 13
5 Limits of surface irregularities . 13
5.1 Uncoated ring-cores . 13
5.1.1 General. 13
5.1.2 Chips and ragged edges . 13
5.1.3 Cracks and pull-outs . 14
5.1.4 Crystallites . 14
5.1.5 Pores . 15
5.2 Coated ring-cores . 15
5.2.1 General. 15
5.2.2 Coating features . 15
5.2.3 Coating performance . 16
5.3 Area and length reference for visual inspection . 16
Bibliography . 18

Figure 1 – Dimensions of ring-cores . 6
Figure 2 – Location of chips and ragged edges on ring-cores . 14
Figure 3 – Location of cracks and pull-out on ring-cores . 14
Figure 4 – Location of crystallite on ring-cores . 15
Figure 5 – Location of pore on ring-cores . 15

Table 1 – Ring-core dimension designations . 6
Table 2 – Standard ring-cores . 7
Table 3 – Effective parameters of ring-cores . 9
Table 4 – Recommended dimensional limits for uncoated ring-cores . 11
Table 5 – Area and length reference for visual inspection . 17

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

Part 12: Ring-cores
FOREWORD
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International Standard IEC 63093-12 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 62317-12 published in 2016 and
the second edition of IEC 60424-4 published in 2015. This edition constitutes a technical
revision.
This edition includes the following significant technical changes with respect to IEC 62317-
12:2016 and IEC 60424-4:2015:
a) IEC 63093-12 integrates the contents of IEC 62317-12:2016 and IEC 60424-4:2015.

– 4 – IEC 63093-12:2019 © IEC 2019
The text of this International Standard is based on the following documents:
FDIS Report on voting
51/1271/FDIS 51/1284/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 docume
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