BS EN 60404-5:2015
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Magnetic materials – Permanent magnet (magnetically hard) materials. Methods of measurement of magnetic properties
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 25 |
The purpose of this part of IEC 60404 is to define the method of measurement of the magnetic flux density, magnetic polarization and the magnetic field strength and also to determine the demagnetization curve and recoil line of permanent magnet materials, such as those specified in lEC 60404‑8‑1 [1] 1 , the properties of which are presumed homogeneous throughout their volume.
The performance of a magnetic system is not only dependent on the properties of the permanent magnet material but also on the dimensions of the system, the air-gap and other elements of the magnetic circuit. The methods described in this part of IEC 60404 refer to the measurement of the magnetic properties in a closed magnetic circuit.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Foreword Endorsement notice |
| 5 | Annex ZA (normative) Normative references to international publications with their corresponding European publications |
| 6 | English CONTENTS |
| 7 | FOREWORD |
| 9 | INTRODUCTION |
| 10 | 1 Scope 2 Normative references 3 Terms and definitions 4 Electromagnet and conditions for magnetization 4.1 General |
| 11 | Figures Figure 1 – Demagnetization curve showing (BH)max point |
| 12 | 4.2 Geometrical conditions 4.3 Electromagnetic conditions Figure 2 – Schematic diagram of electromagnet |
| 13 | 5 Test specimen |
| 14 | 6 Determination of the magnetic flux density 7 Determination of the magnetic polarization |
| 15 | 8 Measurement of the magnetic field strength |
| 16 | 9 Determination of the demagnetization curve 9.1 General 9.2 Principle of determination of the demagnetization curve, test specimen magnetized in the electromagnet |
| 17 | 9.3 Principle of determination of the demagnetization curve, test specimen magnetized in a superconducting coil or pulse magnetizer Figure 3 – Measuring circuit (schematic) |
| 18 | 10 Determination of the principal characteristics 10.1 Remanent flux density 10.2 (BH)max product 10.3 Coercivities HcB and HcJ 10.4 Determination of the recoil line and the recoil permeability |
| 19 | 11 Reproducibility 12 Test report Figure 4 – Demagnetization curve and recoil loop Tables Table 1 – Reproducibility of the measurement of the magnetic characteristics of permanent magnet materials |
| 21 | Annex A (normative) Influence of the air-gap between the test specimen and the pole pieces Figure A.1 – Air-gap Table A.1 – d/l ratios |
| 22 | Annex B (informative) Influence of the ambient temperature on measurement results Table B.1 – Temperature coefficients of Br and HcJ of permanent magnet materials |
| 23 | Bibliography |
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BS EN 60404-5:2015 – TC:2020 Edition
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