1、BRITISH STANDARD BS 5935:1980 IEC60635: 1978 Incorporating Amendment No.1 Specification for Toroidal strip-wound cores made of magnetically soft material ICS 29.030; 29.100.10BS5935:1980 This British Standard, having been prepared under the directionof the Electronic Components Standards Committee,
2、was published underthe authority of the Executive Board and comes into effect on 29 August1980 BSI 04-1999 ISBN 0 580 11434 1 Committees responsible for this British Standard The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of represen
3、tatives from the following Government departments and scientific and industrial organizations: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales Electronic Components Industry Federation* Electronic Engineering Association* Institution o
4、f Electronic and Radio Engineers Ministry of Defence* National Supervising Inspectorate* Post Office Society of British Aerospace Companies Limited* Telecommunication Engineering and Manufacturing Association (TEMA)* The organizations marked with an asterisk in the above list, together with the foll
5、owing, were directly represented on the committee entrusted with the preparation of this British Standard: British Broadcasting Corporation Engineering Equipment Users Association Sheet Makers Conference The Transmission and Distribution Association (BEAMA) United Kingdom Atomic Energy Authority Ame
6、ndments issued since publication Amd. No. Date of issue Comments 9874 February1998 Indicated by a sideline in the marginBS5935:1980 BSI 04-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and object 1 2 Terms and definitions 1 3 Dimensional characteristics
7、of the plain cores 2 4 Materials and strip thickness 3 5 Standard widths of strips 3 6 Standard core sizes 3 7 Protection 3 8 Packing and marking 4 Figure 1 2 Table I Magnetic steel and alloys used for toroidal strip-wound cores 3 Table II Strip thickness and stacking factor 3 Table III Standard rat
8、ios 3 Table IV Standard ranges 4 Publications referred to Inside back coverBS5935:1980 ii BSI 04-1999 National foreword This British Standard has been prepared under the direction of the ElectronicComponents Standards Committee. It is identical with IEC Publication 60635:1978 “Toroidal strip-wound c
9、ores made of magnetically soft material”, prepared by Technical Committee No51, Magnetic components and ferrite materials, of the International Electrotechnical Commission (IEC). Terminology and conventions. The text of the international standard has been approved as suitable for publication, withou
10、t deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards. Cross-references. At present there are no corresponding British Standards for the following international standards referred to in the text. IEC205:1966 and IEC525:197
11、6. The technical committee has reviewed the provisions of these IEC publications and has decided that they are acceptable for use in conjunction with this standard. The related British Standard for IEC50 (901):1973 is BS4727-1:Group 07. NOTEPage numbers quoted in the text refer to the IEC page numbe
12、rs. Amendment No.1 to this standard incorporates Amendment 1:1997 to IEC60635:1978 (formerly IEC635:1978), which adds the value of 0.23mm to the nominal strip thickness in Table11, with a corresponding value for the nominal stacking factor. A British Standard does not purport to include all the nece
13、ssary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages
14、1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5935:1980 BSI 04-1999 1 1 Scope and object This standard covers the dimensional and c
15、onstructional characteristics for toroidal cores wound from strips of magnetically soft steel or alloyhaving a thickness of between 0.003mm and0.35mm. It includes standard ranges of maindimensions and recommendations for strip thickness, core protection, marking and packing. NOTEAll general factors
16、on strip-wound cores are covered in this standard. More particular information, for example, on tolerances of cores and recommendations for application, may be found in national standards. Dimensions of toroidal cores made from magnetic oxides or ferromagnetic powder are given in IEC Publication 525
17、: Dimensions of Toroids made of Magnetic Oxides or Iron Powder. 2 Terms and definitions 2.1 General terms For the definitions of the general terms used in this standard, reference should be made to IEC Publication 50, International Electrotechnical Vocabulary, and in particular to Chapter 901: Magne
18、tism. For the purpose of this standard, the following definitions shall apply: 2.2 toroidal strip-wound core a strip-wound core of circular shape 2.3 stacking factor ratio of the metal cross-section to the total built-up cross-section NOTEThe terms “lamination factor” or “space factor” are sometimes
19、 used instead of stacking factor. 2.4 plain core a core of magnetic steel or alloy strip, as wound and thermally treated, but without additional protectionBS5935:1980 2 BSI 04-1999 3 Dimensional characteristics of the plain cores NOTE 1More accurate formulae can be used as given in IEC Publication 2
20、05: Calculation of the Effective Parameters of Magnetic Piece Parts, recognizing that: A Fe= A eand l Fe= l e where: A e= effective cross-sectional area l e= effective magnetic length of the core both as defined in IECPublication205. NOTE 2A formula for the useful window area A9 whaving regard to wi
21、nding practice is given for plain cores by where d o= inner diameter of the coil wound on the core. For protected cores, d 2should be replaced by the inside diameter of the protective coating, box or bobbin (see Clause7). Figure 1 BS5935:1980 BSI 04-1999 3 4 Materials and strip thicknesses 4.1 Toroi
22、dal strip-wound cores may be produced from magnetic steel or alloy grouped in Table I Table I Magnetic steel and alloys used for toroidal strip-wound cores 4.2 Nominal thicknesses and stacking factors for the material groups of Table I are given in Table II. Table II Strip thickness and stacking fac
23、tor 5 Standard widths of strips The core height is primarily governed by strip width. The following strip widths are preferred: 1.0mm; 1.5mm; 2mm; 3mm; 4mm; 5mm; 6mm; 8mm; 10mm; 12.5mm; 15mm; 20mm; 25mm; 30mm. NOTELarger or smaller strip widths may be based on R10 orR20 numbers. 6 Standard core size
24、s 6.1 Standard ratios of outside to inside diameter of plain cores (see Figure 1, page 7) are given in Table III. It is recommended that for each diameter ratio, the ratio of the height to inner diameter is approximately as indicated in this table. Table III Standard ratios NOTERatio d 1 /d 2= 1.1 i
25、s also acceptable for cores with d 1 # 10mm. 6.2 Standard outside diameters are: 2.5mm; 3.2mm; 4mm; 5mm; 6.3mm; 8mm; 10mm; 12.5mm; 16mm; 20mm; 25mm; 32mm; 40mm; 50mm; 63mm; 80mm; 100mm. NOTELarger diameters should be based on numbers from theR10 or R20 series. 6.3 Cores with ratio of inside diameter
26、 d 2to strip thickness of less than 100 are not recommended. 6.4 The complete standard ranges are given in Table IV. 7 Protection In order to obtain a sufficient insulation between the coil and the winding, and to avoid damage during transport and handling, the core may be protected in one of the fo
27、llowing ways: 7.1 Coated core The plain core is protected by an insulating material such as epoxy resin, usually applied by dipping or brushing. 7.2 Boxed core The plain core is sealed in a close-fitting annular box of plastic, aluminium or another material. In the case of metal boxes, precaution mu
28、st be taken to avoid any short-circuit turn effects. 7.3 Bobbin core The core is wound on a bobbin, usually ceramic or of stainless steel, which passes with the core through the complete treatment. Usually the bobbin is closed by a non-conducting cap or sleeve after the complete processing of the co
29、re. NOTECores with an outside diameter smaller than 10mm shall preferably be constructed as bobbin cores. Material a Designation a Approximate composition in addition to iron a Oriented silicon steel C22 3% silicon Nickel iron alloys E1 72% to 83% nickel E2 54% to 68% nickel E3 45% to 50% nickel gra
30、in oriented or non-oriented E4 35% to 40% nickel Cobalt iron alloys F1 47% to 50% cobalt isotropic or anisotropic a IEC Publication, Classification of magnetic materials (inpreparation). Nominal strip thickness mm Nominal stacking factor ! ! Nickel iron and cobalt iron alloys Oriented silicon steel
31、0,27 to 0,35 0,23 0,20 0,15 0,10 0,05 0,025 (0,030) 0,015 0,01 0,006 0,003 0,95 0,93 0,92 0,90 0,85 0,80 0,70 0,62 0,50 0,35 0,95 0,94 0,92 0,88 0,82 NOTEIn the case of thick material 0,27mm to 0,35mm, a range of thicknesses has been given because several grades of material are produced in different
32、 thicknesses. d 1 /d 2 1.25 1.6 2 h/d 2 0.25 or 0.5 0.3 or 0.6 0.5 or 1BS5935:1980 4 BSI 04-1999 Table IV Standard ranges 8 Packing and marking 8.1 The cores shall be packed for transit in such a manner as to be adequately protected from mechanical damage. 8.2 All packages shall be marked with the f
33、ollowing: a) Core dimensions (d 1 , d 2 , h and strip thickness). b) Quantity. c) Manufacturers name or trade mark. d) Type and grade of material. e) Manufacturers batch identification or date of manufacture. d 1 (mm) d 1 /d 2= 1.25 d 1 /d 2= 1.6 d 1 /d 2= 2 d 2 (mm) h (mm) d 2 (mm) h (mm) d 2 (mm)
34、h (mm) 2.5 2 1 3.2 2.5 1.5 2 1 4 3.2 1.5 2.5 1.5 2 1 2 5 4 1 2 3.2 1 2 2.5 1.5 2 6.3 5 1.5 2 4 1 2 3.2 1.5 3 8 6.3 1.5 3 5 1.5 3 4 2 4 10 8 2 4 6.3 2 4 5 2 5 12.5 10 2 5 8 2 5 6.3 3 6 16 12.5 3 6 10 3 6 8 4 8 20 16 4 8 12.5 4 8 10 5 10 25 20 5 10 16 5 10 12.5 6 12.5 32 25 6 12.5 20 6 12.5 16 8 15 40
35、 32 8 15 25 8 15 20 10 20 50 40 10 20 32 10 20 25 12.5 25 63 50 12.5 25 40 12.5 25 32 15 30 80 63 15 30 50 15 30 40 20 100 80 20 63 20 50 25 BS5935:1980 BSI 04-1999 Publications referred to See national foreword.BS 5935:1980 IEC 60635: 1978 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandard
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