BS EN 60404-15-2012 Magnetic materials Methods for the determination of the relative magnetic permeability of feebly magnetic materials《磁性材料 弱磁性材料的相对磁导率的测定方法》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationMagnetic materialsPart 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materialsBS EN 60404-15:2012Copyright European Committee for Ele

2、ctrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-National forewordThis British Standard is the UK implementation of EN 60404-15:2012. It is identical to IEC 60404-15:2012. It supersedes BS 5884:

3、1999, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/108, Magnetic Alloys and Steels.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary p

4、rovisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012.Published by BSI Standards Limited 2012.ISBN 978 0 580 70733 9 ICS 17.220.01; 29.030 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standa

5、rd was published under the authority of the Standards Policy and Strategy Committee on 31 December 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60404-15:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license wit

6、h CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD EN 60404-15 NORME EUROPENNE EUROPISCHE NORM November 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee

7、fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60404-15:2012 E ICS 17.220.01; 29.030 English version Magnetic materials - Part 15: Methods f

8、or the determination of the relative magnetic permeability of feebly magnetic materials (IEC 60404-15:2012) Matriaux magntiques - Partie 15: Mthodes de dtermination de la permabilit magntique relative des matriaux faiblement magntiques (CEI 60404-15:2012) Magnetische Werkstoffe -Teil 15: Verfahren z

9、ur Bestimmung der Permeabilittszahl schwachmagnetischer Werkstoffe (IEC 60404-15:2012) This European Standard was approved by CENELEC on 2012-10-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the stat

10、us of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French

11、, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, B

12、elgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swe

13、den, Switzerland, Turkey and the United Kingdom. BS EN 60404-15:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 60404-15:2012 Foreword The text of doc

14、ument 68/442/FDIS, future edition 1 of IEC 60404-15, prepared by IEC/TC 68 “Magnetic alloys and steels“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60404-15:2012. The following dates are fixed: latest date by which the document has to be implemented at national level

15、 by publication of an identical national standard or by endorsement (dop) 2013-07-23 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-10-23 Attention is drawn to the possibility that some of the elements of this document may be the subject of

16、patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60404-15:2012 was approved by CENELEC as a European Standard without any modification. BS EN 60404-15:2012Copyright European Co

17、mmittee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 60404-15:2012 Annex ZA (normative) Normative references to international publications with their corresponding European publica

18、tions The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. N

19、OTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050 Series International electrotechnical vocabulary - - ISO/IEC Guide 98-3 2008 Uncertainty of measurement - Part 3: Guide to the

20、expression of uncertainty in measurement (GUM:1995) - - BS EN 60404-15:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-60404-15 IEC:2012 CONTENTS INTRODU

21、CTION . 5 1 Scope . . 6 2 Normative references . 6 3 Terms and definitions . 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 meth

22、od . . 13 5.1 Principle . 13 5.2 Disc inserts and reference materials . . 14 5.3 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 sp

23、ecimen . 17 6.4 Procedure 17 6.5 Uncertainty . 17 7 Test report 17 Annex A (informative) 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

24、balance: side view . . 14 Figure 4 Schematic of the permeability meter arrangement and magnetic 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 cros

25、s section rod with an aspect ratio of 10:1 10 BS EN 60404-15:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-60404-15 IEC:2012 5 INTRODUCTION The determi

26、nation 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“ brass. The relative magnetic permeability of some of these materials

27、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 A/m to 35 A/m and in North America, it is 25 A/m to 35 A/m. However, a

28、t 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 materials have been carried out, primarily with a view to the production of im

29、proved 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 least a magnetic field strength of 100 kA/m. Since conventional metallic ma

30、terials 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 magnetic permeability is stated for all materials but in particular for co

31、nventional 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 because these methods use magnetic fields that vary through the volume

32、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 direct measurement of this effect using a sensitive magnetometer should

33、 be considered. _ 1Figures in square brackets refer to the bibliography. BS EN 60404-15:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 6 60404-15 IEC:2

34、012 MAGNETIC MATERIALS Part 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materials 1 Scope This 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 th

35、e relative magnetic permeability of feebly magnetic materials (including austenitic stainless steel). The magnetic balance and permeability meter methods are both comparison methods calibrated using reference materials to determine the value of the relative magnetic permeability of the test specimen

36、. The relative magnetic permeability range for each of these methods is shown in Table 1. The methods given are for applied magnetic field strengths of between 5 kA/m and 100 kA/m. Table 1 Relative magnetic permeability ranges for the methods described Measurement method Relative magnetic permeabili

37、ty 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 magnetic permeability range given for the magnetic balance method covers the inserts provided with a typical instrument. These can only be assessed at values for wh

38、ich calibrated reference materials exist. NOTE 2 For a relative magnetic permeability larger than 2, a reference material cannot be calibrated 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 onl

39、y. 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 calibrated using reference materials for which the rela

40、tive magnetic permeability has been determined using the reference method. When suitable, the magnetic moment method can also be used. The dimensions of the reference material need to be given careful consideration when determining the uncertainty in the calibration value due to self-demagnetization

41、 effects. See Annex A for more information on correcting for self-demagnetization. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For und

42、ated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at http:/www.electropedia.org/) BS EN 60404-15:2012Copyright European Committee for Electrotechnical Standardization Provided

43、 by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-60404-15 IEC:2012 7 ISO/IEC Guide 98-3:2008, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) 3 Terms and definitions For the purpos

44、es of this document, the terms and definitions given in IEC 60050-221, IEC 60050-121 as well as the following apply. 3.1 self-demagnetization generation of a magnetic field within a magnetized body that opposes the magnetization 3.2 demagnetize to bring a magnetic material to a magnetically neutral

45、state 3.3 feebly magnetic material material that is essentially non-magnetic in character 4 Solenoid and magnetic moment method 4.1 General The methods that are described in Clause 4 are reference methods for determining the relative magnetic permeability of test specimens of feebly magnetic materia

46、ls with a length to diameter ratio of at least 10:1. When the relative magnetic permeability is less than 1,2, it is possible to use a moment detection coil and a test specimen with a length to diameter ratio of 1:1. Both methods use similar equipment and involve similar calculations to determine th

47、e relative magnetic permeability. The descriptions of both methods are therefore presented together here with significant differences explained in the text. 4.2 Principle The relative magnetic permeability of a feebly magnetic test specimen is determined from the magnetic polarization J and the corr

48、esponding magnetic field strength H measured using the circuit shown in Figure 1, using HJ0r1+=(1) where ris the relative magnetic permeability of the test specimen (ratio); 0 is the magnetic constant (4 10-7) (in H/m); J is the magnetic polarization (in T); H is the magnetic field strength (as calculated from the magnetizing current and the magnetic field strength to current ratio (known as the coil constant) for the solenoid) (in A/m). BS EN 60404-15:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license wi