1、BRITISH STANDARD BS EN 61247: 1997 IEC 61247: 1995 PM-cores made of magnetic oxides and associated parts Dimensions The European Standard EN 61247:1997 has the status of a British Standard ICS 29.100.10BSEN61247:1997 This British Standard, having been prepared under the directionof the Electrotechni
2、cal Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 August 1997 BSI 09-1999 ISBN 0 580 27757 7 National foreword This British Standard is the English language version of EN 61247:1997. It is identical with IEC 61247:1995. The UK participation in its p
3、reparation was entrusted to Technical Committee EPL/51, Transformers, inductors, magnetic components and ferrite materials, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or propo
4、sals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 600
5、00 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that Annex ZA lists norma
6、tive references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or u
7、sing the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immuni
8、ty from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 12 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amen
9、dment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN61247:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61247 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61247 May 1997 ICS 29.100.10 Desc
10、riptors: PM-cores, associated parts, magnetic oxides, dimensions, primary standards, mounting hardware English version PM-cores made of magnetic oxides and associated parts Dimensions (IEC 1247:1995) Noyaux PM en oxydes magntiques et pices associes Dimensions (CEI 1247:1995) PM-Kerne aus magnetische
11、n Oxiden und Zubehrteile Mae (IEC 1247:1995) This European Standard was approved by CENELEC on 1997-03-11. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alte
12、ration. 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 official versions (English, French, German). A version in any other language made by t
13、ranslation 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 committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ir
14、eland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassar
15、t 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61247:1997 EEN61247:1997 BSI 09-1999 2 Foreword The text of the International Standard IEC1247:1995, prepared by IEC TC 51, Magnetic components and ferrite m
16、aterials, was submitted to the formal vote and was approved by CENELEC as EN 61247 on 1997-03-11 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this sta
17、ndard, Annex A, Annex B and Annex ZA are normative and Annex C is informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC1247:1995 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 1 Scope and obje
18、ct 3 2 Normative references 3 3 Conversion system 3 4 Primary standards 4 4.1 Dimensions of PM-cores 4 4.2 Dimensions of coil formers 6 4.3 Pin locations and base outlines 7 4.4 Pin diameter 7 5 Mounting hardware 7 Annex A (normative) Derived standards 9 Annex B (normative) Example of a gauge to che
19、ck the coil former space dimensions of PM-cores meeting the IEC primary standard 10 Annex C (informative) Recommended main dimensions for mounting hardware 11 Annex ZA (normative) Normative references to international publications with their corresponding European publications 12 Figure 1 Pin locati
20、ons and base outlines viewed from the underside of the board 8 Table 1 Main dimensions of PM-cores 4 Table 2 Effective parameter and A minvalues 5 Table 3 Main dimensions of coil formers 6 Table B.1 Example of a gauge 10 Table C.1 Main dimensions 11 latest date by which the EN has to be implemented
21、at national level by publication of an identical national standard or by endorsement (dop) 1998-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-03-01EN61247:1997 BSI 09-1999 3 1 Scope and object This International Standard specifies the dimen
22、sions that are of importance for mechanical interchangeability for a preferred range of PM-cores made of magnetic oxides, the main dimensions for coil formers to be used with these cores and the locations of their pins on a modular printed wiring grid in relation to the base outlines of cores. It al
23、so specifies the effective parameter values to be used in calculations involving these cores. The use of derived standards which give a more detailed specification of component parts whilst still permitting compliance with this standard is discussed in Annex A. PM-cores are so called because they ar
24、e derived from pot-cores and have cut outs permitting the use of coil formers containing terminal pins for mounting on a modular printed wiring board. They are mainly intended for use in power applications such as switched mode power supplies (SMPS), pulse power transformers and broadband transforme
25、rs. For these applications the pot-core shape gives the advantage, compared with other shapes, of a relatively large cross-section with correspondingly high magnetic flux, which in turn permits windings of fewer turns for a given power, with the associated benefits of low leakage inductance and self
26、-capacitance. These cores also provide good shielding, easy mounting and enable precise air-gaps to be ground. PM-cores are also of interest for new SMPS techniques involving higher powers at frequencies greater than50 kHz, since, because they possess relatively small openings, the stray field losse
27、s which increase with frequency are much smaller than with any E-core type. The present range of PM-cores contains five sizes, four of which are suitable for mounting directly on a printed wiring board with a simple U-bolt mounting. The locations of the mounting pins for these cores and their number
28、ing are specified: they are at spacings of two modules and their possible number varies from14 to 20. The largest core is too heavy for mounting on a printed wiring board, and neither the number or location of its terminal pins, which are usually located within the cut-out of the core, are specified
29、. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to ag
30、reements based on this InternationalStandard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid InternationalStandards. IEC 205:1966, Calculation of the effective
31、parameters of magnetic piece parts. Amendment No. 1 (1976) Amendment No. 2 (1981) IEC 367-1:1982, Cores for inductors and transformers for telecommunications Part1:Measuring methods. Amendment No. 1 (1984) Amendment No. 2 (1992) ISO 370:1975, Toleranced dimensions Conversion from inches into millime
32、tres and vice versa. 3 Conversion system 3.1 The original system is the metric system. 3.2 Toleranced dimensions have been converted by applying the rules of method A of ISO 370 1) . 1) In practice, the converted dimensions will normally be given with not more than three decimal places. The conversi
33、on rules may, however, result in more than three decimal places in order to keep the tolerance loss at a minimum. In general, it is left to the users of this standard to apply further rounding, but such further rounding has been introduced where it would not cause the two original millimetre limits
34、to be exceeded by more than 2,5 % of the tolerance (i.e. the difference between the two limits).EN61247:1997 4 BSI 09-1999 No rule is laid down for the conversion of the nominal value, but in cases where the converted dimensions are given as a nominal dimension with symmetrical tolerance, it is norm
35、al practice to state that nominal value with the same number of decimal places as the limits. 3.3 Single-limit millimetre dimensions (maximum or minimum) have been converted by applying the appropriate conversion table of ISO 370, and rounding to two more decimal places than the original value in a
36、given column relating to a particular dimension. 4 Primary standards Compliance with the following requirements ensures mechanical interchangeability of the complete assemblies and coil formers. 4.1 Dimensions of PM-cores 4.1.1 Main dimensions The main dimensions of PM-cores shall be as given in Tab
37、le 1. Table 1 Main dimensions of PM-cores Size PM 50/39 PM 62/49 PM 74/59 PM 87/70 PM 114/93 Units max. 50,0 62,0 74,0 87,0 114 mm d 1 1,969 2,441 2,913 3,425 4,488 in min. 48,3 60,0 71,5 84,0 109,5 mm 1,902 2,362 2,815 3,307 4,311 in max. 40,3 50,3 59,3 69,2 91,7 mm d 2 1,587 1,980 2,334 2,724 3,61
38、0 in min. 39,0 48,8 57,5 67,1 88,0 mm 1,535 1,921 2,264 2,642 3,465 in max. 20,0 25,5 29,5 31,7 43,0 mm d 3 0,787 1,004 1,161 1,248 1,693 in min. 19,4 24,7 28,5 30,7 41,6 mm 0,764 0,972 1,122 1,209 1,638 inEN61247:1997 BSI 09-1999 5Table 1 Main dimensions of PM-cores 4.1.2 Effective parameter and A
39、minvalues The effective parameter and A minvalues for PM-cores of which the dimensions comply with 4.1.1 shall be as given in Table 2 (see IEC 205, for the definition of these parameters and their calculation; and item 3 of17.6 of IEC 367-1, for the definition of A min ). Table 2 Effective parameter
40、 and A minvalues Size PM 50/39 PM 62/49 PM 74/59 PM 87/70 PM 114/93 Units max. 5,7 5,7 5,7 8,8 5,8 mm d 4 0,2244 0,2244 0,2244 0,3465 0,2284 in min. 5,4 5,4 5,4 8,5 5,4 mm 0,2126 0,2126 0,2126 0,3346 0,2126 in max. 39,0 49,0 59,0 70,0 93,0 mm h 1 1,535 1,929 2,322 2,756 3,661 in min. 38,6 48,6 58,4
41、69,2 92,0 mm 1,512 1,913 2,299 2,724 3,622 in max. 27,2 34,2 41,5 48,8 64,6 mm h 2 1,071 1,346 1,634 1,921 2,543 in min. 26,4 33,4 40,7 48,0 63,0 mm 1,039 1,315 1,602 1,890 2,480 in c max. 23,0 28,5 33,0 36,0 45,0 mm 0,9055 1,122 1,299 1,417 1,772 in ! 5 120 120 120 90 90 degrees e max. 7,8 10,5 13,
42、5 8,3 11,5 mm 0,3071 0,4134 0,5315 0,3268 0,4528 in f min. 23,4 29,0 34,0 40,0 52,0 mm 0,9213 1,141 1,338 1,575 2,047 in max. 1,6 1,6 2,9 3,9 4,4 mm t 0,0630 0,0630 0,1142 0,1535 0,1732 in min. 1,2 1,2 2,5 3,5 4,0 mm 0,0472 0,0472 0,0984 1,378 0,1575 in max. 5,0 5,0 5,0 5,5 6,3 mm b 0,1969 0.1969 0,
43、1969 0,2165 0,2480 in min. 4,0 4,0 4,0 4,5 5,3 mm 0,1575 0,1575 0,1575 0,1772 0,2087 in NOTEThe dimensions of the cores may be checked by means of gauges. By way of example, a possible standard for these gauges is given in Annex B. In order to facilitate production it may be necessary to use gauges
44、having dimensions differing from those given in Annex B, although no relaxation of the requirements for the dimensions of the cores given in 4.1.1 is thereby permitted. Size C 1 C 2 I e A e V e A min a mm 1 mm 3 mm mm 2 mm 3 mm 2 PM 50/39 0,226 69 0,613 75 10 3 84,0 369 30 900 281 PM 62/49 0,190 09
45、0,330 93 10 3 109 570 63 000 470 PM 74/59 0,162 22 0,205 50 10 3 128 790 101 000 630 PM 87/70 0,160 54 0,177 01 10 3 146 910 132 000 700 PM 114/93 0,116 29 0,676 92 10 4 200 1 720 343 000 1 380 a A minis located at the centre pole only.EN61247:1997 6 BSI 09-1999 4.2 Dimensions of coil formers The ma
46、in dimensions of coil formers shall be as given in Table 3. Table 3 Main dimensions of coil formers Size PM 50/39 PM 62/49 PM 74/59 PM 87/70 PM 114/93 Units max. 38,6 48,5 57,2 66,4 87,3 mm d 1 1,520 1,909 2,252 2,614 3,437 in min. 38,2 48,1 56,7 65,8 86,0 mm 1,504 1,894 2,232 2,591 3,386 in max. 23
47、,4 28,7 32,7 35,2 48,2 mm d 2 0,921 1,130 1,287 1,386 1,898 in min. 23,0 28,3 32,3 34,7 47,0 mm 0,906 1,114 1,272 1,366 1,850 in max. 20,4 26,1 30,3 32,7 44,6 mm d 3 0,803 1,028 1,193 1,287 1,756 in min. 20,2 25,8 29,9 32,1 43,8 mm 0,795 1,016 1,177 1,264 1,724 in max. 26,0 33,0 40,0 47,3 62,5 mm h
48、1,024 1,299 1,574 1,862 2,461 in min. 25,6 32,5 39,3 46,5 61,3 mm 1,008 1,280 1,547 1,831 2,413 in max. 1,25 1,35 1,35 1,55 2,30 mm s 1 0,0492 0,0532 0,0532 0,0610 0,0906 in min. 0,95 1,05 1,05 1,25 2,00 mm 0,0374 0,0413 0,0413 0,0492 0,0787 in max. 1,65 1,65 1,75 1,95 2,50 mm s 2 0,0630 0,0630 0,06
49、89 0,0768 0,0984 in min. 1,35 1,35 1,45 1,65 2,20 mm 0,0532 0,0532 0,0571 0,0650 0,0866 inEN61247:1997 BSI 09-1999 7 4.3 Pin locations and base outlines When coil formers are provided with pins intended for use in conjunction with a printed wiring board, they shall be inserted in the thicker flange (s 2 ), and their location, numbering and relationship to the core base outline shall be as shown in Figure 1, in which the bases are viewed from the pin side, that is from the underside of the printed
