SIST EN IEC 60404-7:2020

SLOVENSKI STANDARD
SIST EN IEC 60404-7:2020
01-julij-2020
Magnetni materiali - 7. del: Metode za merjenje koercitivnosti (do 160 kA/m)
magnetnih materialov v odprtem magnetnem krogu (IEC 60404-7:2019)
Magnetic materials - Part 7: Method of measurement of the coercivity (up to 160 kA/m) of
magnetic materials in an open magnetic circuit (IEC 60404-7:2019)
Magnetische Materialien - Teil 7: Verfahren zur Messung der Koerzitivfeldstärke (bis160
kA/m) von magnetischen Werkstoffen in einem offenen Magnetkreis (IEC 60404-7:2019)
Matériaux magnétiques - Partie 7: Méthode de mesure de la coercitivité (jusqu'à 160
kA/m) des matériaux magnétiques en circuit magnétique ouvert (IEC 60404-7:2019)
Ta slovenski standard je istoveten z: EN IEC 60404-7:2020
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.030 Magnetni materiali Magnetic materials
SIST EN IEC 60404-7:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60404-7:2020

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SIST EN IEC 60404-7:2020


EUROPEAN STANDARD EN IEC 60404-7

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2020
ICS 29.030; 17.220.20 Supersedes EN 10330:2015 and all of its amendments
and corrigenda (if any)
English Version
Magnetic materials - Part 7: Method of measurement of the
coercivity (up to 160 kA/m) of magnetic materials in an open
magnetic circuit
(IEC 60404-7:2019)
Matériaux magnétiques - Partie 7: Méthode de mesure de Magnetische Materialien - Teil 7: Verfahren zur Messung
la coercitivité (jusqu'à 160 kA/m) des matériaux der Koerzitivfeldstärke (bis160 kA/m) von magnetischen
magnétiques en circuit magnétique ouvert Werkstoffen in einem offenen Magnetkreis
(IEC 60404-7:2019) (IEC 60404-7:2019)
This European Standard was approved by CENELEC on 2019-02-20. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60404-7:2020 E

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SIST EN IEC 60404-7:2020
EN IEC 60404-7:2020 (E)
European foreword
The text of document 68/596/CDV, future edition 2 of IEC 60404-7, prepared by IEC/TC 68 "Magnetic
alloys and steels" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60404-7:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-10-24
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-04-24
document have to be withdrawn

This document supersedes EN 10330:2015 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60404-7:2019 was approved by CENELEC as a European
Standard without any modification.


2

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SIST EN IEC 60404-7:2020



IEC 60404-7

®


Edition 2.0 2019-01




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Magnetic materials –

Part 7: Method of measurement of the coercivity (up to 160 kA/m) of magnetic

materials in an open magnetic circuit




Matériaux magnétiques –

Partie 7: Méthode de mesure de la coercitivité (jusqu'à 160 kA/m) des matériaux


magnétiques en circuit magnétique ouvert













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.030; 17.220.20 ISBN 978-2-8322-6385-3



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

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CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle of the method . 7
5 Test specimen . 8
6 Solenoid . 8
7 Compensation for the earth’s magnetic field and static and dynamic magnetic
noise fields . 8
8 Magnetic shielding of the measurement region . 8
9 Measurement . 8
9.1 Magnetization . 8
9.2 Measuring methods . 9
9.2.1 General . 9
9.2.2 Method A . 9
9.2.3 Method B . 10
9.3 Determination of coercivity . 11
9.4 Reproducibility . 12
10 Test report . 13
Annex A (normative)  Precautions to be taken for measurements of coercivity below
40 A/m, with a complex shaped test specimen and some special cases . 14
A.1 Coercivity below 40 A/m . 14
A.2 Coercivity measurement of test specimens with complex shapes . 14
A.3 Optimization of the amplitude and time of the magnetizing cycle for a test
specimen of soft magnetic material . 14
A.4 Mechanical stress and heating of the test specimen in the solenoid . 14
Annex B (informative) Method C with a VSM (Vibrating Sample Magnetometer) . 15
Bibliography . 17

Figure 1 – Demagnetizing B(H) and J(H) curves from saturation . 6
Figure 2 – Circuit diagram for Methods A and B . 7
Figure 3 – Method A, magnetic flux sensing probe: Hall probe . 9
Figure 4 – Method A, magnetic flux sensing probe: differential fluxgate probe . 10
Figure 5 – Method B, magnetic flux sensing probe: differential fluxgate probe . 11
Figure 6 – Magnetic polarisation J over the length L of a cylindrical rod . 12
Figure B.1 – Schematic diagram of Method C with a VSM . 15

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IEC 60404-7:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MAGNETIC MATERIALS –

Part 7: Method of measurement of the coercivity (up to 160 kA/m) of
magnetic materials in an open magnetic circuit

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 60404-9 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
This second edition cancels and replaces the first published in 1982. This edition constitutes
a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 1: The scope includes a more detailed description of the magnetic materials which
applies to this standard;
b) Clause 4: Figure 2 – circuit diagram for methods A and B was simplified and the fluxgate
probes inside the solenoid have been added;
c) Clause 7: Compensation for the earth’s magnetic field and for static and dynamic
magnetic noise fields has been added;

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d) Clause 8: Magnetic shielding of the measuring region has been added;
e) 9.2.2: The measuring methods for local and integral measurement of the flux in the test
specimen have been separated and the limitations in size and shape of the test specimen
have been considered.
f) 9:3: The method C with a VSM (Vibrating Sample Magnetometer) has been moved from
9.3 to the Annex B.
g) The term "complex shaped test specimen" has been replaced in several clauses by "test
specimen different from ellipsoids".
h) The character of Annex A has been changed from “informative” to “normative”.
The text of this International Standard is based on the following documents:
CDV Report on voting
68/596/CDV 68/608A/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 60404 series, published under the general title Magnetic materials,
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.

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SIST EN IEC 60404-7:2020
IEC 60404-7:2019 © IEC 2019 – 5 –
MAGNETIC MATERIALS –

Part 7: Method of measurement of the coercivity (up to 160 kA/m) of
magnetic materials in an open magnetic circuit



1 Scope
This part of IEC 60404 specifies a method of measurement of the coercivity of magnetic
materials in an open magnetic circuit.
This document is applicable to all magnetic materials with coercivities from 0,2 A/m to
160 kA/m.
NOTE Examples of magnetic materials covered by this document are amorphous alloys, nanocrystalline alloys, all
softmagnetic crystalline materials (e.g. Fe, FeSi-, CoFe- and FeNi-alloys), soft ferrites, hard metals, semi-hard
1
magnetic alloys (e.g. FeCoTiAl-, FeCoV-, FeCrCo- and AlNiCo-alloys) [1] .
Special precautions are to be taken in measuring coercivities below 40 A/m, in materials with
high conductivity and in test specimens which have a shape different from ellipsoids (see
Annex A).
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.
There are no normative references in this document.
3 Terms and definitions
For the purpose of this document, the following terms and definitions 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
3.1
coercivity H
cJ
value of the coercive field strength in a material when the magnetic flux density, magnetic
polarization or magnetization is brought from saturation by a monotonically changing magnetic
field to zero
Note 1 to entry: The parameter that is varied should be stated, and the appropriate symbol used as follows: H
cB
for the coercivity relating to the magnetic flux density, H for the coercivity relating to the magnetic polarization,
cJ
H for the coercivity relating to the magnetization. The first two symbols supersede H and H respectively.
cM cB cJ
—————————
1
Numbers in square brackets refer to the Bibliography.

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3.2
demagnetize
to reduce the magnetic flux density of a magnetized material along the demagnetization curve
Note 1 to entry: The coercivities H and H are respectively discriminated depending on the hysteresis loop
cB cJ
being defined in the B = f(H) or J = f(H) system (see Figure 1). It can be shown that, for materials of
high-differential permeability in the region B = 0, the difference between the coercivity H and the coercivity H is
cJ cB
negligible since:
∆H
 
1 µ
H = H  − 
cB cJ 0
∆B
 
 (1)
where
H coercivity relating to the magnetic flux density, in amperes per metre;
cB
H coercivity relating to the magnetic polarization, in amperes per metre;
cJ
ΔB incremental change in magnetic flux density (at B = 0), in teslas;
ΔH corresponding change in magnetic field strength, in amperes per metre;
-7
µ magnetic constant (4π x 10 in henrys per metre).
o

Key
B magnetic flux density, in teslas
J magnetic polarization, in teslas
H magnetic field strength, in amperes per metre
B remanent flux density in, tes
...