1、BRITISH STANDARD BS EN 62044-1:2002 Cores made of soft magnetic materials Measuring methods Part 1: Generic specification The European Standard EN 62044-1:2002 has the status of a British Standard ICS 29.100.10 BS EN 62044-1:2002 This British Standard, having been prepared under the direction of the
2、 Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 28 October 2002 BSI 28 October 2002 ISBN 0 580 40647 4 National foreword This British Standard is the official English language version of EN 62044-1:2002. It i
3、s identical with IEC 62044-1:2002. The UK participation in its preparation was entrusted to Technical Committee EPL/51, Transformers, inductors, magnetic components and ferrite materials, which has the responsibility to: A list of organizations represented on this committee can be obtained on reques
4、t to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Ele
5、ctronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to
6、 understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document co
7、mprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 62044-1 NORME EUROPENNE EUROPI
8、SCHE NORM August 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and
9、by any means reserved worldwide for CENELEC members. Ref. No. EN 62044-1:2002 E ICS 29.100.10 English version Cores made of soft magnetic materials - Measuring methods Part 1: Generic specification (IEC 62044-1:2002) Noyaux en matriaux magntiques doux - Mthodes de mesure Partie 1: Spcification gnriq
10、ue (CEI 62044-1:2002) Kerne aus weichmagnetischen Werkstoffen - Messmethoden Teil 1: Fachgrundspezifikation (IEC 62044-1:2002) This European Standard was approved by CENELEC on 2002-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions fo
11、r giving this European Standard the status 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 Central Secretariat or to any CENELEC member. This European Standard exists in three offi
12、cial versions (English, French, 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 Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical comm
13、ittees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 51/660/FDIS, future edition 1 of IEC 62044-
14、1, prepared by IEC TC 51, Magnetic components and ferrite materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62044-1 on 2002-07-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identi
15、cal national standard or by endorsement (dop) 2003-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-07-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been added by
16、CENELEC. _ Endorsement notice The text of the International Standard IEC 62044-1:2002 was approved by CENELEC as a European Standard without any modification. _ Page2 EN620441:2002CORES MADE OF SOFT MAGNETIC MATERIALS MEASURING METHODS Part 1: Generic specifications 1 Scope and object This Internati
17、onal standard applies to magnetic cores made of soft magnetic materials used in inductors, transformers and devices used to suppress electromagnetic interference. This standard is to provide guidance for the specification of measuring methods for both magnetic and non-magnetic (for example, mechanic
18、al, electrical, etc.) properties. This standard is limited to the general principles to be followed for the various possible test methods. For the magnetic properties, it should be considered that the measurement result using a measuring coil can be directly related to a specified parameter (for exa
19、mple inductance) of a magnetic component using the magnetic core. In this case, the measuring method should be chosen in order to obtain a good correlation with the corresponding magnetic component measurement results. 2 Normative references The following referenced documents are indispensable for t
20、he application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068 (all parts), Environmental testing 3 Environmental conditions 3.1 General The cores are magnetica
21、lly conditioned in accordance with clause 4, if required, for a given measurement method. During the whole procedure, the core shall be protected against mechanical and magnetic disturbances. Condensation on measuring windings, which may occur at changing temperature, should be avoided. 3.2 Ambient
22、Temperature Unless otherwise specified, the whole measurement procedure shall take place at a temper- ature within the range of standard atmospheric conditions for testing according to IEC 60068. During the whole period of the measurement, however, the temperature shall not vary to such an extent as
23、 to have an appreciable effect on the measuring results. In some cases, this may necessitate the use of a temperature controlled chamber. The assembled cores with measuring coil and clamping devices shall be kept in this environment for a sufficient time to reach thermal equilibrium. The temperature
24、 during measurement shall be stated. NOTE This subclause means that the measurements may be made at any temperature within the range of 15 C to 35 C but preferably at (25 3) C. Page3 EN620441:20024 General precautions 4.1 Relation to practice The measuring conditions shall be so chosen that the meas
25、ured results are suitable for predicting the performance of the core. This does not imply that all conditions have to correspond to those prevailing in practice. 4.2 Mounting of cores consisting of more than one part For cores consisting of more than one part and which are assembled around the measu
26、ring coil, a clamping device shall be used throughout the measurements. This clamping device shall be able to distribute the force uniformly over the contact surfaces and hold the core parts rigidly in position relative to each other. The clamping force shall be specified within a region where the v
27、ariation of the parameter to be measured is as small as possible. This force shall be kept constant within 10 % during the total period of the measurement. NOTE Since the inductance is generally the property most sensitive to force variations, a specific clamping force may be specified for the induc
28、tance measurement and adopted for the measurement of other parameters. The mating surfaces shall be cleaned before the measurement. The cleaning procedure shall be able to remove dust particles, particularly from polished or fine ground surfaces. The core parts shall then be assembled around the mea
29、suring coil, the latter being locked in position with respect to the core by suitable means, for example washer. The core parts shall be centred and the specified force applied for a sufficient time to allow any variations with time of the parameter to be measured to become negligible. 4.3 Selection
30、 of the measuring coil The measuring coil shall be selected according to the following considerations: The number of turns should be specified in relation to the measurement conditions, the equipment used and the accuracy to be obtained. The resistance and self-capacitance of a winding should be as
31、low as possible to make the related errors negligible. For coils consisting of more than one winding the inter-winding capacitance should be also kept as low as possible. The windings should be wound as close to the core as possible, to make the coupling as close to 100 % as possible. For toroidal c
32、ores, the turns shall be evenly distributed around the core. For other core shapes, the windings shall occupy as much of the window area as possible. This is particularly important for inductance measurements on cores with large air gaps. 5 Magnetic conditioning 5.1 Object In order to obtain a well-
33、defined and reproducible magnetic state of a core before measurements, magnetic conditioning shall be carried out as specified. Page4 EN620441:20025.2 Principles of the methods There are two main methods: a) the electrical method in which the specimen is subjected to an alternating magnetic field of
34、 sufficient magnitude, of which the amplitude is gradually reduced to zero; b) the thermal method in which the specimen is taken above the Curie point. 5.3 Procedure for the electrical method The initial peak of the field strength shall take the core well above the knee of the magnetization curve an
35、d during the reduction of amplitude there shall be two flux reversals in the core for each complete cycle. There are two possibilities: a) A decreasing alternating current is passed through the measuring coil on the specimen obliterating its magnetic history. The current decrease may be: 1) Linear:
36、a sine-wave generator supplies the input signal to the power amplifier. A suitable gain control circuit is used to shape the amplitude of the amplifier output over a time interval so as to provide a current in the test winding on the core to be conditioned with the desired frequency and with a presc
37、ribed peak amplitude variation. The amplitude reduction shall then extend over not less than 50 cycles; 2) Exponential: a capacitor is charged to a pre-set voltage and then discharged through an indicator in series with a test winding on the core to be conditioned. The capacitor and inductor togethe
38、r with the winding on the core and any other elements in the discharge circuit determine the oscillatory discharge current. The ratio of two consecutive current peaks in the same direction shall be not less than 0,78. The coil shall not be appreciably heated by the current during conditioning. b) Th
39、e specimen is passed through the alternating field in the air-gap of an electromagnet. The number of turns of the windings, the current through them and the dimensions of the air-gap shall be so chosen so as to obtain a field strength of approximately 25 kA/m in the air-gap. 5.4 Procedure for the th
40、ermal method The core shall be heated at a specified rate of temperature change and maintained for 30 min to 60 min at a temperature approximately 25 C in excess of the Curie point. The heating rate shall not exceed 2 C/min. Cooling shall also take place at a rate not exceeding 5 C/min. Before using
41、 this method, it shall be verified that, as a result of the heating cycle, the core material will not show irreversible changes (such as may occur in materials with a constricted loop). During the whole procedure, the core shall be protected against magnetic and mechanical disturbances. 6 Measuremen
42、t accuracy The accuracy attained during the measurement of a parameter is related to the measuring method. This should be chosen so that its accuracy fits the specified limits of the parameter to be measured. The accuracy is limited not only by the intrinsic accuracy of the measuring equipment used
43、but also by the environmental conditions and by the assembly of the core and measuring coil (see 4.2). This is a consequence of the fact that core and measuring coil are assembled in a provisional way. Page5 EN620441:2002The accuracy of the measurement methods for soft magnetic material cores is inh
44、erently limited and different from the accuracy of methods used for magnetic components. This should be considered for the required correlation between the measurements on a core and on a magnetic component using the core. Page6 EN620441:2002Annex ZA (normative) Normative references to international
45、 publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated referenc
46、es, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTE When an international publicatio
47、n has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60068 Series Environmental testing EN 60068 Series Page7 EN620441:2002BS EN 62044-1:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI i
48、s the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make su
49、re that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members
