IEC 60404-10:2016

IEC 60404-10 ®
Edition 2.0 2016-10
INTERNATIONAL
STANDARD
Magnetic materials –
Part 10: Methods of measurement of magnetic properties of electrical steel strip
and sheet at medium frequencies

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IEC 60404-10 ®
Edition 2.0 2016-10
INTERNATIONAL
STANDARD
Magnetic materials –
Part 10: Methods of measurement of magnetic properties of electrical steel strip

and sheet at medium frequencies

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030 ISBN 978-2-8322-3672-7

– 2 – IEC 60404-10:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General principle of a.c. measurements . 8
4.1 General . 8
4.2 Principle of the 25 cm Epstein frame method . 8
4.3 Test specimen . 8
4.4 The 25 cm Epstein frame . 9
4.5 Air flux compensation . 10
4.6 Power supply . 11
4.7 Voltage measurement . 11
4.7.1 General . 11
4.7.2 Average type voltmeter . 11
4.7.3 RMS voltmeter . 11
4.8 Current measurement . 12
4.9 Frequency measurement . 12
4.10 Power measurement . 12
5 Procedure for the determination of the specific total loss . 12
5.1 General . 12
5.2 Preparation for measurement . 12
5.3 Adjustment of power supply . 13
5.4 Measurements of power . 14
5.5 Determination of the specific total loss . 14
5.6 Reproducibility of the specific total loss measurement . 15
6 Procedure for the determination of the peak value of magnetic polarization, r.m.s.
value of magnetic field strength, peak value of magnetic field strength and specific
apparent power . 15
6.1 General . 15
6.2 Test specimen . 15
6.3 Principle of measurement. 15
ˆ
6.3.1 Peak value of magnetic polarization J . 15
6.3.2 RMS value of the magnetizing current (of the magnetic field strength) . 16
6.3.3 Peak value of magnetic field strength . 16
6.4 Apparatus . 17
6.4.1 Average rectified voltage measurement . 17
6.4.2 Current measurement . 17
6.4.3 Peak current measurement . 17
6.4.4 Resistor R . 18
n
6.4.5 Mutual inductor M . 18
D
6.5 Measuring procedure . 18
ˆ
6.6 Determination of the peak value of magnetic polarization J . 18
~
6.7 Determination of the r.m.s. value of magnetic field strength H . 19
ˆ
6.8 Determination of the peak value of magnetic field strength H . 19

6.9 Determination of the specific apparent power S . 20
s
6.10 Reproducibility . 21
7 Test report . 21
Annex A (informative) Epstein frame for use at medium frequencies . 22
Annex B (informative) Digital sampling method for the determination of the magnetic
properties . 23
B.1 General . 23
B.2 Technical details and requirements . 23
B.3 Calibration aspects . 25
B.4 Numerical air flux compensation . 26
Bibliography . 27

Figure 1 – Double-lapped joints . 8
Figure 2 – The 25 cm Epstein frame . 9
Figure 3 – Circuit for the wattmeter method . 13
Figure 4 – Circuit for measuring r.m.s. value of the magnetizing current . 16
Figure 5 – Circuit for measuring the peak value of magnetic field strength using a peak
voltmeter . 16
Figure 6 – Circuit for measuring the peak value of magnetic field strength using a
mutual inductor M . 17

– 4 – IEC 60404-10:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 10: Methods of measurement of magnetic properties
of electrical steel strip and sheet at medium frequencies

FOREWORD
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International Standard IEC 60404-10 has been prepared by IEC tech
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