prEN IEC 60404-18:2024
(Main)Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials - Methods of measurement of the magnetic properties in an open magnetic circuit using a superconducting magnet
Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials - Methods of measurement of the magnetic properties in an open magnetic circuit using a superconducting magnet
Magnetische Werkstoffe - Teil 18: Permanentmagnetische (magnetisch harte) Werkstoffe - Verfahren zur Messung der magnetischen Eigenschaften in einem offenen Magnetkreis mit Hilfe eines supraleitenden Magneten
Matériaux magnétiques - Partie 18: Matériaux (magnétiques durs) pour aimants permanents - Méthodes de mesure des propriétés magnétiques en circuit magnétique ouvert à l'aide d'un aimant supraconducteur
Magnetni materiali - 18. del: Materiali za permanentne (trdomagnetne) magnete - Metode merjenja magnetnih lastnosti v odprtem magnetnem krogu z uporabo superprevodnega magneta
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2024
Magnetni materiali - 18. del: Materiali za permanentne (trdomagnetne) magnete -
Metode merjenja magnetnih lastnosti v odprtem magnetnem krogu z uporabo
superprevodnega magneta
Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials -
Methods of measurement of the magnetic properties in an open magnetic circuit using a
superconducting magnet
Matériaux magnétiques - Partie 18: Matériaux (magnétiques durs) pour aimants
permanents - Méthodes de mesure des propriétés magnétiques en circuit magnétique
ouvert à l'aide d'un aimant supraconducteur
Ta slovenski standard je istoveten z: prEN IEC 60404-18:2024
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.030 Magnetni materiali Magnetic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
68/768/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60404-18 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-07-12 2024-10-04
SUPERSEDES DOCUMENTS:
68/757/CD, 68/766/CC
IEC TC 68 : MAGNETIC ALLOYS AND STEELS
SECRETARIAT: SECRETARY:
Germany
Mr Richard Daniel Knobloch
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
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TITLE:
Magnetic materials - Part 18: Permanent magnet (magnetically hard) materials - Methods of
measurement of the magnetic properties in an open magnetic circuit using a superconducting
magnet
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
This CDV document was prepared by the Project Leader on the basis of the second CD and the
comments received from National Committees (see 68/767/CC) and the contributions from the Project
Team, following the decision made by the TC 68 Chairman.
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
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-2- IEC CDV 60404-18 © IEC
3 CONTENTS
5 FOREWORD . 4
6 1 Scope . 7
7 2 Normative references . 7
8 3 Terms and definitions . 7
9 4 General principle . 8
10 Principle of the method . 8
11 Superconducting magnet (SCM) . 10
12 Magnetic field strength sensor (H sensor) . 10
13 Magnetic dipole moment detection coil (M coil) . 10
14 Specimen rod and moving device . 11
15 Measuring devices and the data processing device . 11
16 5 Test specimen . 12
17 6 Preparation of measurement . 12
18 Measurement of volume of the test specimen . 12
19 Initial magnetization of the test specimen to saturation . 12
20 7 Determination of magnetic polarization . 13
21 Measurement of the magnetic dipole moment . 13
22 7.1.1 SCM-VSM method . 13
23 7.1.2 SCM-Extraction method . 13
24 Determination of magnetic polarization . 13
25 8 Measurement of magnetic field . 14
26 9 Calibration of the magnetic dipole moment detection coil (M coil) . 14
27 10 Determination of demagnetization curve . 14
28 11 Demagnetizing field correction . 15
29 General . 15
30 Method A: Method using a demagnetizing factor determined by the shape of
31 the test specimen only . 15
32 Method B: Method using a demagnetizing factor determined by the shape
33 and the magnetic susceptibility of the test specimen . 16
34 Method C: Method using an inverse analysis considering the spatial
35 distribution of the self-demagnetizing field strength in the test specimen. 16
36 12 Determination of principal magnetic properties . 17
37 Remanent magnetic polarization J . 17
r
38 Maximum energy product (BH) . 17
max
39 Coercivity (H and H ) . 17
cJ cB
40 13 Reproducibility of the measurements . 17
41 14 Test report . 17
42 Annex A (informative) Demagnetizing field correction . 19
43 Annex B (informative) Details of the demagnetizing field correction . 21
44 B.1 General . 21
45 B.2 Symbols . 21
46 B.3 Method using a demagnetizing factor determined by the shape and magnetic
47 susceptibility of the test specimen (Method B) . 22
– 3 – IEC CDV 60404-18 © IEC
48 B.4 Method using an inverse analysis considering the spatial distribution of the
49 self-demagnetizing field strength in the test specimen (Method C) . 24
50 Annex C (informative) VSM measurement of the test specimen at elevated
51 temperatures . 27
52 Annex D (informative) Effect of test specimen dimensions on the magnetic properties . 28
53 Annex E (informative) Comparison of the magnetic properties measured with a
54 superconducting VSM and a permeameter. 29
55 Bibliography . 30
57 Figure 1 – Demagnetization curve J(H) . 8
58 Figure 2 – Schematic diagrams of the test apparatus . 9
59 Figure 3 – Schematic diagrams of the first order gradiometer coil . 11
60 Figure A.1 – Schematic diagram of the demagnetizing field correction . 19
61 Figure A.2 – Comparison of the demagnetization curves corrected using
62 demagnetizing field correction Methods A, B and C . 20
63 Figure B.1 – Axes of a cuboid magnet . 22
64 Figure B.2 – Conceptual diagram of the procedure of Method C . 24
65 Figure B.3 – Flowchart of the procedure of Method C . 25
66 Figure C.1 – Schematic diagram of the heating unit equipped in a test apparatus . 27
67 Figure D.1 – Effects of test specimen dimensions on magnetic properties [Br, HcJ, HcB
68 and (BH) ] of Nd-Fe-B sintered and hot deformed magnets with different average
max
69 grain sizes . 28
70 Figure E.1 – Comparison of demagnetization curves measured with a permeameter
71 and a superconducting VSM . 29
73 Table A.1 – Features of the demagnetizing field correction methods in comparison
74 with Method B . 19
75 Table E.1 – Comparison of magnetic properties with a permeameter and a
76 superconducting VSM . 29
-4- IEC CDV 60404-18 © IEC
79 INTERNATIONAL ELECTROTECHNICAL COMMISSION
80 ____________
82 MAGNETIC MATERIALS –
84 Part 18: Permanent magnet (magnetically hard) materials –
85 Methods of measurement of the magnetic properties in an open
86 magnetic circuit using a superconducting magnet
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