1、 IEC 60404-15 Edition 1.0 2012-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Magnetic materials Part 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materials Matriaux magntiques Partie 15: Mthodes de dtermination de la permabilit magntique relative des ma
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16、15 Edition 1.0 2012-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Magnetic materials Part 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materials Matriaux magntiques Partie 15: Mthodes de dtermination de la permabilit magntique relative des matriaux faib
17、lement magntiques INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE S ICS 17.220.01; 29.030 PRICE CODE CODE PRIX ISBN 978-2-83220-343-9 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationa
18、le Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 60404-15 IEC:2012 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms and defi
19、nitions . 7 4 Solenoid and magnetic moment method . 7 4.1 General . 7 4.2 Principle 7 4.3 Apparatus 8 4.4 Test specimen for the solenoid method . 10 4.5 Procedure . 11 4.6 Calculation 12 4.7 Uncertainty 13 5 Magnetic balance method . 13 5.1 Principle 13 5.2 Disc inserts and reference materials 14 5.
20、3 Test specimen . 14 5.4 Procedure . 15 5.5 Evaluation of the relative magnetic permeability 15 5.6 Uncertainty 15 6 Permeability meter method . 15 6.1 Principle 15 6.2 Reference specimens and materials 16 6.3 Test specimen . 17 6.4 Procedure . 17 6.5 Uncertainty 17 7 Test report 17 Annex A (informa
21、tive) Correction for self-demagnetization . 18 Bibliography 20 Figure 1 Circuit diagram for the solenoid method . 8 Figure 2 Coil system for the determination of the magnetic dipole moment 9 Figure 3 Magnetic balance: side view . 14 Figure 4 Schematic of the permeability meter arrangement and magnet
22、ic field distribution without and with test specimen . 16 Table 1 Relative magnetic permeability ranges for the methods described . 6 Table 2 Cylindrical sample with a 1:1 aspect ratio 10 Table 3 Circular cross section rod with an aspect ratio of 10:1 . 10 60404-15 IEC:2012 3 INTERNATIONAL ELECTROTE
23、CHNICAL COMMISSION _ MAGNETIC MATERIALS Part 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materials FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical c
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34、ch patent rights. International Standard IEC 60404-15 has been prepared by IEC technical committee 68: Magnetic alloys and steels. The text of this standard is based on the following documents: FDIS Report on voting 68/442/FDIS 68/443/RVD Full information on the voting for the approval of this stand
35、ard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 60404-15 IEC:2012 A list of all the parts in the IEC 60404 series, under the general title Magnetic materials, can be found on the IEC website
36、. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a re
37、vised edition, or amended. 60404-15 IEC:2012 5 INTRODUCTION The determination of the relative magnetic permeability of feebly magnetic materials is often required to assess their effect on the ambient magnetic field. Typical feebly magnetic materials are austenitic stainless steels and “non-magnetic
38、“ brass. The relative magnetic permeability of some of these materials can vary significantly with the applied magnetic field strength. In the majority of cases, these materials find application in the ambient earths magnetic field. This field in Europe is 35 A/m to 40 A/m, in the far East, it is 25
39、 A/m to 35 A/m and in North America, it is 25 A/m to 35 A/m. However, at present, methods of measurement are not available to determine the relative magnetic permeability of feebly magnetic materials at such a low value of magnetic field strength. Studies of the properties of feebly magnetic materia
40、ls have been carried out, primarily with a view to the production of improved reference materials. These studies have shown 11that it is possible to produce reference materials which have a substantially constant relative magnetic permeability over the range from the earths magnetic field to at leas
41、t a magnetic field strength of 100 kA/m. Since conventional metallic materials can also be used as reference materials their relative magnetic permeability can be determined using the reference method. It is important that the magnetic field strength used during the determination of the relative mag
42、netic permeability is stated for all materials but in particular for conventional materials since the changes with applied magnetic field can be large. This behaviour also needs to be considered when using reference materials made from conventional materials to calibrate comparator methods. This is
43、because these methods use magnetic fields that vary through the volume of the material being tested and this makes it difficult to know the relative magnetic permeability to use for the calibration. Where the effect of a feebly magnetic material on the ambient earths magnetic field is critical, the
44、direct measurement of this effect using a sensitive magnetometer should be considered. _ 1Figures in square brackets refer to the bibliography. 6 60404-15 IEC:2012 MAGNETIC MATERIALS Part 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materials 1 Scope Thi
45、s part of IEC 60404 specifies a solenoid method, a magnetic moment method, a magnetic balance method and a permeability meter method for the determination of the relative magnetic permeability of feebly magnetic materials (including austenitic stainless steel). The magnetic balance and permeability
46、meter methods are both comparison methods calibrated using reference materials to determine the value of the relative magnetic permeability of the test specimen. The relative magnetic permeability range for each of these methods is shown in Table 1. The methods given are for applied magnetic field s
47、trengths of between 5 kA/m and 100 kA/m. Table 1 Relative magnetic permeability ranges for the methods described Measurement method Relative magnetic permeability range Solenoid 1,003 to 2 Magnetic moment 1,003 to 1,2 Magnetic balance 1,003 to 5 Permeability meter 1,003 to 2 NOTE 1 The relative magn
48、etic permeability range given for the magnetic balance method covers the inserts provided with a typical instrument. These can only be assessed at values for which calibrated reference materials exist. NOTE 2 For a relative magnetic permeability larger than 2, a reference material cannot be calibrat
49、ed using this written standard. A note of this is given in the test report explaining that the values measured using the magnetic balance are for indication only. The solenoid method is the reference method. The magnetic moment method described is used mainly for the measurement of the relative magnetic permeability of mass standards. Two comparator methods used by industry are described. These can be calibrate
