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BS EN IEC 60404-7:2020

BS EN IEC 60404-7:2020

$102.76

Magnetic materials – Method of measurement of the coercivity (up to 160 kA/m) of magnetic materials in an open magnetic circuit

Published By Publication Date Number of Pages
BSI 2020 22
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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 magnetic alloys (e.g. FeCoTiAl-, FeCoV-, FeCrCo-and AlNiCo-alloys) [1]. 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).

PDF Catalog

PDF Pages PDF Title
2 undefined
5 English
CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
3 Terms and definitions
9 Figures
Figure 1 – Demagnetizing B(H) and J(H) curves from saturation
10 4 Principle of the method
Figure 2 – Circuit diagram for Methods A and B
11 5 Test specimen
6 Solenoid
7 Compensation for the earth’s magnetic field and static and dynamic magnetic noise fields
8 Magnetic shielding of the measurement region
9 Measurement
9.1 Magnetization
12 9.2 Measuring methods
9.2.1 General
9.2.2 Method A
Figure 3 – Method A, magnetic flux sensing probe: Hall probe
13 9.2.3 Method B
Figure 4 – Method A, magnetic flux sensing probe: differential fluxgate probe
14 9.3 Determination of coercivity
Figure 5 – Method B, magnetic flux sensing probe: differential fluxgate probe
15 9.4 Reproducibility
Figure 6 – Magnetic polarisation J over the length L of a cylindrical rod
16 10 Test report
17 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
A.1 Coercivity below 40 A/m
A.2 Coercivity measurement of test specimens with complex shapes
A.3 Optimization of the amplitude and time of the magnetizing cycle for a test specimen of soft magnetic material
A.4 Mechanical stress and heating of the test specimen in the solenoid
18 Annex B (informative)Method C with a VSM (Vibrating Sample Magnetometer)
Figure B.1 – Schematic diagram of Method C with a VSM
20 Bibliography

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BS EN IEC 60404-7:2020
$102.76