IEC 63182-1:2020

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
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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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-8379-0

– 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

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

Part 1: General specification
FOREWORD
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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.
– 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.
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
wi
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