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 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.
This edition includes the following significant technical changes with respect to the previous edition:
Clause 1: The scope includes a more detailed description of the magnetic materials which applies to this standard;
Clause 4: Figure 2 – circuit diagram for methods A and B was simplified and the fluxgate probes inside the solenoid have been added;
Clause 7: Compensation for the earth’s magnetic field and for static and dynamic magnetic noise fields has been added;
Clause 8: Magnetic shielding of the measuring region has been added;
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.
9:3: The method C with a VSM (Vibrating Sample Magnetometer) has been moved from 9.3 to the Annex B.
The term "complex shaped test specimen" has been replaced in several clauses by "test specimen different from ellipsoids".
The character of Annex A has been changed from “informative” to “normative”.

Matériaux magnétiques - Partie 7: Méthode de mesure de la coercitivité (jusqu'à 160 kA/m) des matériaux magnétiques en circuit magnétique ouvert

L'IEC 60404-7:2019 spécifie une méthode de mesure de la coercitivité des matériaux magnétiques en circuit magnétique ouvert. Le présent document est applicable à l'ensemble des matériaux magnétiques dont les valeurs de coercitivité sont comprises entre 0,2 A/m et 160 kA/m.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
Article 1: le domaine d'application inclut une description plus complète des matériaux magnétiques qui s'applique à la présente norme;
Article 4 – Figure 2: le schéma du circuit pour les Méthodes A et B a été simplifié et les sondes de flux à seuil à l'intérieur du solénoïde ont été ajoutées;
Article 7: la compensation du champ magnétique terrestre et des champs magnétiques parasites statiques et dynamiques a été ajoutée;
Article 8: le blindage magnétique de la zone de mesure a été ajouté;
9.2.2: les méthodes de mesure pour le mesurage local et intégral du flux dans l'éprouvette ont été séparées, et les limites de taille et de forme de l'éprouvette ont été prises en compte;
9.3: la Méthode C avec un VSM (magnétomètre à échantillon vibrant) a été déplacée du 9.3 à l'Annexe B;
le terme "éprouvette de forme complexe" a été remplacé dans plusieurs articles par le terme "éprouvette différente des ellipsoïdes";
le statut de l'Annexe A a été modifié; cette annexe n'est plus '"informative" mais "normative".

General Information

• Status: Published
• Publication Date: 15-Jan-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Drafting Committee: WG 2 - TC 68/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 14-Jan-2019
• Completion Date: 16-Jan-2019

Standards Content (Sample)

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

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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

– 2 – IEC 60404-7:2019 © IEC 2019
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

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
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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;

– 4 – IEC 60404-7:2019 © IEC 2019
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 hav
...