1、 IEC 60424-4 Edition 2.0 2015-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Ferrite cores Guidelines on the limits of surface irregularities Part 4: Ring-cores Noyaux ferrites Lignes directrices relatives aux limites des irrgularits de surface Partie 4: Noyaux toriques IEC 60424-4:2015-12(en-fr) TH
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19、vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60424-4 Edition 2.0 2015-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Ferrite cores Guidelines on the limits of surface irregularities Part 4: Ring-cores Noyaux ferrites Lign
20、es directrices relatives aux limites des irrgularits de surface Partie 4: Noyaux toriques INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.100.10 ISBN 978-2-8322-3027-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la
21、 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 60424-4:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative r
22、eferences 5 3 Limits of surface irregularities 5 3.1 Uncoated ring-cores 5 3.1.1 General . 5 3.1.2 Chips and ragged edges 5 3.1.3 Cracks and pull-out 6 3.1.4 Crystallites 6 3.1.5 Pores . 7 3.2 Coated ring-cores . 7 3.2.1 General . 7 3.2.2 Coating features 7 3.2.3 Coating performance . 8 3.3 Area and
23、 length reference for visual inspection . 8 Bibliography 10 Figure 1 Chips and ragged edges location on ring-cores 6 Figure 2 Cracks and pull-out location on ring-cores 6 Figure 3 Crystallites location for ring-cores 7 Figure 4 Pores location for ring-cores 7 Table 1 Area and length reference for vi
24、sual inspection . 9 IEC 60424-4:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FERRITE CORES GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES Part 4: Ring-cores FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising a
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34、 references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsibl
35、e for identifying any or all such patent rights. International Standard IEC 60424-4 has been prepared IEC technical committee 51: Magnetic components and ferrite materials. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. Th
36、is edition includes the following significant technical changes with respect to the previous edition: a) addition of crystallites in 3.1.3 and of pores in 3.1.4. 4 IEC 60424-4:2015 IEC 2015 The text of this standard is based on the following documents: FDIS Report on voting 51/1109/FDIS 51/1124/RVD
37、Full information on the voting for the approval 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 Ferr
38、ite cores Guidelines on the limits of surface 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
39、the contents of this publication will remain 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 604
40、24-4:2015 IEC 2015 5 FERRITE CORES GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES Part 4: Ring-cores 1 Scope This part of IEC 60424 gives guidance on allowable limits of surface irregularities applicable to ring-cores in accordance with the relevant generic specification defined in IEC 60424-1.
41、This standard is considered as a sectional specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable fo
42、r its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Void. 3 Limits of surface irregularities 3.1 Uncoated ring-cores 3.1.1 General Generally, uncoated ring-cores are smoothe
43、d (for example: by tumbling) to remove any significant flash and to add radius to edges that would otherwise be sharp due to tooling angles. Tooling angles exist where the compaction punches meet the interior of the die mold, where a sharp angle in the edge of the piece that is formed is unavoidable
44、. This is also the location inside the ferrite tool set where flashing may occur. The purpose of removing flash and rounding edges is to allow uncoated ring cores to be wound with insulated wire, using typical production winding processes, without damage to the wire. 3.1.2 Chips and ragged edges Fig
45、ure 1 shows examples of chips and ragged edges location on ring-cores. Ragged edges as defined in IEC 60424-1 are allowed. Chips shall not exceed 25 % of the wall thickness either in length or in width, up to a maximum of 2 mm. The maximum number of chips shall not exceed 3 on one core edge and a to
46、tal of 5 on all edges. 6 IEC 60424-4:2015 IEC 2015 Figure 1 Chips and ragged edges location on ring-cores 3.1.3 Cracks and pull-out Figure 2 shows examples of cracks and pull-out location on ring-cores. Cracks (C1) perpendicular to the magnetic flux path are allowed but shall not exceed 20 % of the
47、wall thickness. Cracks (C2) parallel to the magnetic flux are allowed but shall not exceed 12,5 % (1/8) of the relevant core circumference. Crazing (C3) which is a grid-like pattern of superficial cracks (e.g. depth less than 0,5 mm) is allowed. Pull-out (C4) is allowed but the relevant cumulative a
48、rea on each affected core surface shall not exceed 25 % of its area. Excess dirt or ferrite debris on the surface or in the window of uncoated ring-cores is not acceptable. NOTE In any case, cores with surface irregularities will meet relevant electrical specifications. Figure 2 Cracks and pull-out
49、location on ring-cores 3.1.4 Crystallites Figure 3 shows examples of crystallites location on ring-cores. A single area of the crystallites located on any surface shall be less than 2 % of the respective surface area. The cumulative area of the crystallites located on any surface shall be less than 4 % of the respective surface area. IEC Pull-out (C4) Cracks (C1) Crazing (C3) Cracks (C2) IEC Chi
