IEC 63182-7:2025

IEC 63182-7 ®
Edition 1.0 2025-08
INTERNATIONAL
STANDARD
Magnetic powder cores - Guidelines on dimensions and the limits of surface
irregularities -
Part 7: EER-cores
ICS 29.100.10  ISBN 978-2-8327-0667-1

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CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Primary dimensions . 4
4.1 General . 4
4.2 Dimensions of EER-cores . 4
4.2.1 Main dimensions . 4
4.2.2 Effective parameter and A values . 5
min
4.3 Dimensional limits for coil formers . 6
5 Limits of surface irregularities . 7
5.1 General . 7
5.2 Examples of surface irregularities . 7
5.3 Chips and ragged edges . 7
5.3.1 General. 7
5.3.2 Chips and ragged edges on the mating surfaces . 8
5.3.3 Chips and ragged edges on the other surfaces. 8
5.4 Cracks . 8
5.5 Flash . 9
5.6 Rust . 9
5.7 Discoloration . 10
Annex A (informative) Derived standards . 11

Figure 1 – Main dimensions of EER-cores . 5
Figure 2 – Main dimensions of coil formers for EER-cores . 6
Figure 3 – Examples of surface irregularities . 7
Figure 4 – Locations of chips and ragged edges for EER-cores . 8
Figure 5 – Locations of cracks for EER-cores . 9
Figure 6 – Locations of flashes for EER-cores . 9
Figure 7 – Locations of rust for EER-cores . 10

Table 1 – Main dimensions of EER-cores . 5
Table 2 – Effective parameter and Amin values . 6
Table 3 – Dimensional limits of coil formers for EER-cores . 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Magnetic powder cores –
Guidelines on dimensions and the limits of surface irregularities -
Part 7: EER-cores
FOREWORD
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IEC 63182 has been prepared by IEC technical committee 51: Magnetic components, ferrite
and magnetic powder materials. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
51/1561/FDIS 51/1577/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
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.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data
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