1、 IEC 60424-1 Edition 2.0 2015-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Ferrite cores Guidelines on the limits of surface irregularities Part 1: General specification Noyaux ferrites Lignes directrices relatives aux limites des irrgularits de surface Partie 1: Spcification gnrale IEC 60424-1:20
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19、.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60424-1 Edition 2.0 2015-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Ferrite cores Guidelines on the limits of surface irregularities Part 1: General specific
20、ation Noyaux ferrites Lignes directrices relatives aux limites des irrgularits de surface Partie 1: Spcification gnrale INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.100.10 ISBN 978-2-8322-3028-2 Registered trademark of the International Electrotechnical
21、 Commission Marque dpose de la Commission Electrotechnique Internationale 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 IEC 60424-1:2015 IEC 2015 CONTENTS FOREWO
22、RD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative reference 6 3 Terms and definitions. 6 4 Examples of irregularities . 7 5 Locations and functions of core parts and surfaces 7 5.1 General . 7 5.2 Mating surfaces . 7 5.3 Centre post . 8 5.4 Outer walls or legs 8 5.5 Back wall, bottom and back surfaces .
23、 8 5.6 Wire-slot area . 8 5.7 Wire-way area . 8 5.8 Clamping recess area . 8 6 Area and length reference for visual inspection 8 7 Limits of surface irregularities 11 7.1 General . 11 7.2 Chips and ragged edges 11 7.3 Cracks 11 7.4 Flash. 11 7.5 Pull-outs . 11 7.6 Pores 11 7.7 Crystallites 11 8 Sect
24、ional specifications 11 Bibliography 13 Figure 1 Examples of surface irregularities . 7 Figure 2 Location of main core parts and surfaces Example of RM-core type . 7 Table 1 Area and length reference for visual inspection 10 Table 2 IEC 60424 sectional specifications . 12 IEC 60424-1:2015 IEC 2015 3
25、 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FERRITE CORES GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES Part 1: General specification FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committ
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36、tent rights. International Standard IEC 60424-1 has been prepared IEC technical committee 51: Magnetic components and ferrite materials. This second edition cancels and replaces the first edition published in 1999. This edition constitutes a technical revision. This edition includes the following si
37、gnificant technical changes with respect to the previous edition: a) addition of pores in 3.5 and crystallites in 3.6. 4 IEC 60424-1:2015 IEC 2015 The text of this standard is based on the following documents: FDIS Report on voting 51/1107/FDIS 51/1123/RVD Full information on the voting for the appr
38、oval of this standard 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. A list of all parts in the IEC 60424 series, published under the general title Ferrite cores Guidelines on the limits of surfa
39、ce irregularities, can be found on the IEC website. Future standards in this series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of the next edition. The committee has decided that the contents of this publication will remai
40、n unchanged until the stability date indicated on the IEC website 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 revised edition, or amended. IEC 60424-1:2015 IEC 2015 5 INTRODUCTION Due to th
41、e method of manufacture and the physical nature of the products, ferrite cores can be expected to exhibit some degree of physical irregularities such as chips, ragged edges, cracks, flashing, and pull-out. The permissible extent of these surface irregularities will depend on the type, position and s
42、ize of the defect and on the function of the core. Thus, in order to establish limits of surface irregularities for a given series of ferrite cores, for example RM-cores, pot-cores, E-cores, U- cores and ring-cores, it is necessary to prepare a particular specification for each, setting out in detai
43、l the permissible extent of the various types of irregularities. All surfaces of the core should be clean and free from loose ferrite particles or any other foreign matter. This is more critical for mating surfaces that should make good contact with one another. Stains, discolorations, surface crazi
44、ng or crystallization are acceptable if they do not affect the normal performance of the core. The irregularities described below are considered as being detectable without the use of any magnifying equipment. Surface irregularities limits are set for control of cosmetic appearance, and not for cont
45、rol of magnetic performance. Surface irregularities do not substantially affect core magnetic function, nor do they affect reliability. Reliability should be assessed for wound magnetics, rather than for cores alone. See IEC 60401-3 for more details concerning the reliability of ferrite cores and de
46、vices built with them. 6 IEC 60424-1:2015 IEC 2015 FERRITE CORES GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES Part 1: General specification 1 Scope This part of IEC 60424 gives guidelines on the allowable limits of surface irregularities of ferrite cores. This standard should be considered as
47、a general specification useful in the dialogue between ferrite core manufacturers and customers about surface irregularities. 2 Normative reference The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated reference
48、s, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Void. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 chips and ragged edges areas with missing surfa
49、ce material that are generally caused by mechanical impact during handling 3.2 crack surface irregularity which has a width much smaller than its length, and penetrates into the core 3.3 flash sharp feather-edge wall extending beyond the intended contour surface of the core 3.4 pull-out consequence of the removal of a surface layer of the core due to die “sticking” 3.5 pores holes left on the surface of cores a
