IEC 60424-8-2015 Ferrite cores - Guidelines on the limits of surface irregularities - Part 8 PQ-cores《铁氧体磁芯 表面不规则性的限制指南 第8部分 PQ磁芯》.pdf

1、 IEC 60424-8 Edition 1.0 2015-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Ferrite cores Guidelines on the limits of surface irregularities Part 8: PQ-cores Noyaux ferrites Lignes directrices relatives aux limites des irrgularits de surface Partie 8: Noyaux PQ IEC 60424-8:2015-08(en-fr) THIS PUBLI

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19、rez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60424-8 Edition 1.0 2015-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Ferrite cores Guidelines on the limits of surface irregularities Part 8: PQ-cores Noyaux ferrites Lignes directr

20、ices relatives aux limites des irrgularits de surface Partie 8: Noyaux PQ INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.100.10 ISBN 978-2-8322-2803-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Elec

21、trotechnique 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 60424-8:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Te

22、rms and definitions 5 4 Limits of surface irregularities 6 4.1 Chips and ragged edges . 6 4.1.1 Chips and ragged edges located on the mating surface . 6 4.1.2 Chips located on other surfaces . 6 4.2 Cracks 9 4.3 Pull-out . 10 4.4 Crystallites 10 4.5 Flash 11 4.6 Pores 11 Bibliography 13 Figure 1 Exa

23、mples of surface irregularities 5 Figure 2 Chips and ragged edges location . 6 Figure 3 Cracks location 9 Figure 4 Reference dimensions for PQ-cores . 9 Figure 5 Pull-out location . 10 Figure 6 Crystallites location 11 Figure 7 Flash location. 11 Figure 8 Pores location 12 Table 1 Limits for allowab

24、le chipping areas 7 Table 2 Area and length reference of irregularities for visual inspection . 8 Table 3 Limits for cracks 10 IEC 60424-8:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FERRITE CORES GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES Part 8: PQ-cores FOREWORD 1) The Int

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35、he elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60424-8 has been prepared by technical committee 51: Magnetic components and ferrite materials. The text of this standa

36、rd is based on the following documents: CDV Report on voting 51/1078/CDV 51/1084/RVC 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

37、. 4 IEC 60424-8:2015 IEC 2015 A list of all parts in the IEC 60424 series, published under the general title Ferrite 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 e

38、xisting 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 remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication.

39、 At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IEC 60424-8:2015 IEC 2015 5 FERRITE CORES GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES Part 8: PQ-cores 1 Scope This part of IEC 60424 gives guidance on allowable limits of surface irregul

40、arities applicable to PQ-cores in accordance with the relevant generic specification. This standard is considered as a sectional specification useful in the negotiation between ferrite core manufacturers and users about surface irregularities. 2 Normative references The following documents, in whole

41、 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. IEC 60401-1, Terms and nomenclature for

42、cores made of magnetically soft ferrites Part 1: Terms used for physical irregularities IEC 60424-1, Ferrite cores Guide on the limits of surface irregularities Part 1: General specification 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60424-1 and

43、 IEC 60401-1, as well as the following apply. 3.1 pores holes left on the surface of cores after sintering and surface finishing SEE: Figure 1. Figure 1 Examples of surface irregularities IEC 6 IEC 60424-8:2015 IEC 2015 4 Limits of surface irregularities 4.1 Chips and ragged edges 4.1.1 Chips and ra

44、gged edges located on the mating surface The areas of the chips located on the mating surface (see C1 and C1 irregularities in Figure 2) shall not exceed the following limits: the cumulative area of the chips located on the mating surface shall be less than 4 % of the total mating surface; the cumul

45、ative area of the chips located on the centre post mating surface shall be less than 2 % of the total mating surface; the cumulative area of the chips located on the mating surface of one outer leg shall be less than 1 % of the total mating surface; The total length of the ragged edges shall be less

46、 than 25 % of the perimeter of the relevant mating surface. 4.1.2 Chips located on other surfaces The areas of the chips located on the other surfaces (see C2, C2, C3 and C3 irregularities in Figure 2) shall not exceed the following limits: the allowable chipping areas are doubled as compared to the

47、 limits for the whole mating surfaces (see Table 1); the rule for the ragged edges is the same as for the mating surfaces; chips and ragged edges are not acceptable on the inner edges of the wire slot area. Figure 2 Chips and ragged edges location The limits of allowable chipping areas shall be in a

48、ccordance with Table 1. IEC IEC 60424-8:2015 IEC 2015 7 Table 1 Limits for allowable chipping areas Unit: mm 2Core size Chipping on mating surface of one outer leg Chipping on mating surface of centre post Overall chipping on mating surface Overall chipping on other surfaces PQ20/16 1,0 2,0 4,5 9,0

49、PQ20/20 1,0 2,0 4,5 9,0 PQ26/20 2,0 4,5 9,5 19,0 PQ26/25 2,0 4,5 9,5 19,0 PQ32/20 3,0 6,0 12,0 24,0 PQ32/30 3,0 6,0 12,0 24,0 PQ35/35 3,0 6,5 13,0 26,0 PQ40/40 3,5 7,0 14,0 28,0 PQ50/50 6,0 12,5 25,0 50,0 NOTE For the relevant core sizes refer to IEC 62317-13. The area and length reference of irregularities for visual inspection are given in Table 2.