1、BRITISH STANDARD BS4999-147: 1988 IEC136:1986 Incorporating Amendment No.1 General requirements for rotating electrical machines Part 147: Specification for dimensions of brushes and brush-holders for electrical machinery UDC621.313 13:621.313.047.4/.5:620.1BS4999-147:1988 This British Standard, hav
2、ing been prepared under the directionof the Power ElectricalEngineering StandardsCommittee, was published undertheauthority ofthe BoardofBSIand comesinto effect on 31 March1988 BSI07-1999 The following BSI references relate to the work on this standard: Committee reference PEL/1 Draft for comment87/
3、22615DC ISBN 0 580 16427 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted to the Power Electrical Engineering Standards Committee (PEL/-) to Technical Committee PEL/1, upon which the following bodies were represented: Association of Consulting
4、 Engineers Association of Electrical Machinery Trades Association of Supervisory and Executive Engineers British Coal Bureau of Engineer Surveyors ERA Technology Ltd. Electricity Supply Industry in England and Wales Engineer Surveyors Section of the ASTMS Engineering Equipment and Materials Users As
5、sociation Health and Safety Executive Ministry of Defence Power Generation Association (BEAMA Ltd.) Rotating Electrical Machines Association (BEAMA Ltd.) South of Scotland Electricity Board UK Offshore Operators Association Ltd. Amendments issued since publication Amd.No. Date of issue Comments 8834
6、 October 1995 Indicated by a sideline in the marginBS4999-147:1988 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii Section 1. Principal dimensions and tolerances 1 Scope 1 2 Letter symbols for the principal dimensions of brushes for cylindrical commutators
7、and slip rings 1 3 Standard dimensions 1 4 Marking 2 5 Limits and tolerances on principal dimensions t and a of the carbon brushes and brush-holders and on dimension r of carbon brushes 3 6 Recommended combinations of the principal dimensions t, a and r 5 Section 2. Complementary dimensions of brush
8、esTerminations of brushes 7 Complementary dimensions of brushes 9 7.1 Chamfers of brushes 9 7.2 Angles for contact and top bevels 10 7.3 Pressure area 10 7.4 Depth of insertion q of the flexible (shunt) in the brush 12 7.5 Safe length of a worn brush, dimension rm 15 8 Terminations of brushes 16 8.1
9、 Terminal types, slots or holes and suitable screw sizes also the thickness of metal for spade, flag and double shoe terminals Box or tubular terminals 16 8.2 Spade terminals 16 8.3 Flag terminals 17 8.4 Double shoe terminals 18 8.5 Box or tubular terminals 18 8.6 Length of flexibles (shunts) 19 8.7
10、 Details of flexibles (shunts) 21 8.8 Current capacity and minimum thickness of terminals 21 Appendix A Details of brush-holders 23 Appendix B IEC Technical Questionnaire for users of carbon brushes 27 Appendix C Test procedures for determining physical properties of carbon brushes for electrical ma
11、chines 28 Appendix D Recommended values of thickness for spade, flag and double shoe terminals 32 National appendix X Other IEC Publications applicable to brushes, brush-holders, commutators and slip-rings 33 Figure 1 Brushes for cylindrical commutators 1 Figure 2 Brushes for cylindrical slip rings
12、1 Figure 3 9 Figure 4 10 Figure 5 10 Figure 6 10 Figure 7 11 Figure 8 11 Figure 9 12BS4999-147:1988 ii BSI 07-1999 Page Figure 10 12 Figure 11 15 Figure 11a 16 Figure 12 17 Figure 13 17 Figure 14 17 Figure 15 17 Figure 16 18 Figure 17 18 Figure 18 19 Figure 19 19 Figure 20 19 Figure 21 19 Figure 22
13、19 Figure A.1 23 Figure A.2 24 Figure A.3 26 Figure C.1a 28 Figure C.1b 28 Figure C.2a Moulded or tamped connection 29 Figure C.2b Riveted connection 29 Figure C.2c Soldered connection 29 Figure C.2d Moulded or tamped connection 29 Figure C.2e Metal top soldered or riveted connection 29 Figure C.3 3
14、1 Figure C.4 31 Figure C.5 31 Table I Limits for t and a in micrometres and in thousandths of aninch,r inmillimetres and inches 3 Table II Preferred combinations t a are printed in bold-face type, asarethepreferredvaluesof r. 5 Table III 7 Table IV 9 Table V 9 Table VI 11 Table VII 11 Table VIII 1fl
15、exible 13 Table IX 2flexibles 13 Table X 4flexibles 13 Table XI 1flexible 14 Table XII 2flexibles 14 Table XIII 4flexibles 15 Table XIV 16 Table XV 17 Table XVI 18 Table XVII 18 Table XVIII 20 Table XIX 20BS4999-147:1988 BSI 07-1999 iii Page Table XX 21 Table XXI 22 Table A.I 25 Table A.II 26 Public
16、ations referred to Inside back coverBS4999-147:1988 iv BSI 07-1999 National foreword This Part of BS4999 has been prepared under the direction of the Power Electrical Engineering Standards Committee and is identical with IECPublication136:1986 “Dimensions of brushes and brush-holders for electrical
17、machinery” including Amendment1, published by the International Electrotechnical Commission (IEC). It supersedes BS96:1954 and all of BS4362-A1:1968 with the exception of Appendix A. These two standards are now withdrawn. Appendix A of BS4362-A1:1968 is superseded by BS 4999-146 “Definitions and nom
18、enclature for carbon brushes, brush-holders, commutators and slip-rings” 1) , which is identical with IEC Publication276:1968 “Definitions and nomenclature for carbon brushes, brush-holders, commutators and slip-rings”, including Amendment No.1(1987). Terminology and conventions. The text of the int
19、ernational standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In
20、British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever page numbers are quoted in the text, they are the IEC page numbers stated in brackets at the bottom of each page. Wherever “IEC” and “the IEC” are given, they should both be read as “BSI”. In
21、 addition to the technically equivalent British Standard, a related British Standard to ISO68 is BS1580 “Specification for unified screw threads” Part3:1965 “Diameters below in.”. The Technical Committee has reviewed the provisions of IEC Publication228, to which reference is made in the text, and h
22、as decided that they are acceptable for use in conjunction with this standard. A related British Standard to IECPublication228 is BS6360:1981 “Specification for conductors in insulated cables and cords”. In Table XIV, Table XV and Table XVI, reference is made to ISORecommendation388. Since publicati
23、on of IEC Publication136 this document has been withdrawn, and the material thicknesses given inTable XXI should be used. It should also be noted that in footnote2) toTable I, the first sentence should read “The tolerances for the brush-holders are in accordance with E10 of ISO/R286.”, the previous
24、standard having been superseded by ISO/R286 “ISO system of limits and fits Part1: General, tolerances and deviations”. BS4500 “ISO limits and fits” Part1:1969 “General, tolerances and deviations” is technically equivalent to ISO/R286. Additional information. In addition to IEC Publications136 and 27
25、6 there are a number of other IEC Publications dealing with brushes, brush-holders, commutators and slip-rings which are not so widely used as to warrant publication as British Standards, but which are, nevertheless, useful for reference purposes. A list of these IEC Publications is given in Nationa
26、l appendix X. NOTETypographical error. The title of7.1 should be read as “Chamfers of brushes”. 1) In preparation. Cross-references International standard Corresponding British Standard ISO68-1973 BS3643ISO metric screw threads Part1:1981 Principles and basic data (Technically equivalent)BS4999-147:
27、1988 BSI 07-1999 v 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 immunity from legal obligations. Summary of pages This
28、document comprises a front cover, an inside front cover, pagesi to vi, pages1to34, 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.vi blankBS49
29、99-147:1988 BSI 07-1999 1 Section 1. Principal dimensions and tolerances 1 Scope This standard applies to brushes and brush-holders for electrical machinery. For the present it applies only to brushes and brush-holders for cylindrical commutators and slip rings. 2 Letter symbols for the principal di
30、mensions of brushes for cylindrical commutators and slip rings NOTESee Sub-clause7.5. The dimensions should be stated in the following sequence: t a r The sign is to be placed between the symbols. 3 Standard dimensions t =tangential dimension of a brush (or set of split brushes) a =axial dimension r
31、 =radial dimension Figure 1 Brushes for cylindrical commutators Figure 2 Brushes for cylindrical slip rings Dimensions in millimetres 1.6 16 2 20 2.5 25 3.2 32 4 40 5 50 6.3 64 8 80 10 100 12.5 125BS4999-147:1988 2 BSI 07-1999 The metric dimensions are those recommended by the IEC, but since two sys
32、tems of units are in use, namely, millimetres and inches, and until all countries adopt the metric dimensions, the following dimensions in inches are included. 4 Marking To avoid confusion between dimensions in millimetres and in inches, brushes and brush-holders should be marked as follows: On brus
33、hes, this marking shall preferably be applied on the same face as the grade marking and may be combined with the grade marking. It should be so placed that it will still be visible when the brush is fully worn. If the manufacturer prefers, the marking may be applied to the opposite face to that carr
34、ying the grade marking. For brush-holders, taking into account the great variety of shapes and constructions, the marking may be applied where the manufacturer prefers, provided it is visible by the user when the brush-holders are mounted on the machine. Dimensions in inches 1 / 16 1 1 / 8 1 1 / 4 3
35、 / 16 1 1 / 2 1 / 4 1 3 / 4 5 / 16 2 3 / 8 2 1 / 4 7 / 16 2 1 / 2 1 / 2 2 3 / 4 5 / 8 3 3 / 4 3 1 / 2 7 / 8 4 5 Metric dimensions Inch dimensions tBS4999-147:1988 BSI 07-1999 3 5 Limits and tolerances on principal dimensions t and a of the carbon brushes and brush-holders and on dimension r of carbo
36、n brushes Table I Limits for t and a in micrometres and in thousandths of an inch a , r in millimetres and inches a Nominal values Brush-holder b Brush Clearance Brush t a t a r mm in Max. Min. Diff. Max. Min. Diff. Max. Min. 1.6 2 2.5 1 / 16 +54 + 2.1 +14 + 0.55 40 1.55 90 3.5 30 1.20 60 2.3 144 5.
37、6 44 1.75 0.3 0.0118 3.2 1 / 8 +68 + 2.7 +20 + 0.80 48 1.90 90 3.5 30 1.20 60 2.3 158 6.2 50 2.0 0.3 0.0118 4 5 3 / 16 +68 + 2.7 +20 + 0.80 48 1.90 110 4.3 30 1.20 80 3.1 178 7.0 50 2.0 0.3 0.0118 6.3 8 10 1 / 4 5 / 16 3 / 8 +83 + 3.3 +25 + 1.00 58 2.3 110 4.3 30 1.20 80 3.1 193 7.6 55 2.2 0.3 0.011
38、8 12.5 16 7 / 16 1 / 2 5 / 8 +102 +4.0 +32 +1.25 70 2.8 130 5.1 40 1.60 90 3.5 232 9.1 72 2.8 0.5 0.0197 20 25 3 / 4 7 / 8 1 +124 +4.9 +40 +1.60 84 3.3 130 5.1 40 1.60 90 3.5 254 10.0 80 3.2 0.5 0.0197 32 40 50 1 1 / 4 1 1 / 2 +150 +5.9 +50 +1.95 100 3.9 150 5.9 50 1.95 100 3.9 300 11.8 100 3.9 0.8
39、0.0315 64 80 1 3 / 4 2 +180 +7.1 +60 +2.4 120 4.7 150 5.9 50 1.95 100 3.9 330 13.0 110 4.3 0.8 0.0315 100 125 1.0 2 1 / 4 .3 2 1 / 2 .4 2 3 / 4 .5 0.040 a The tolerance values in inches are given in italic type. b The tolerances for the brush-holders are in accordance with ISA Tol.E10. In order to c
40、heck the brush holder dimensions, full form “go” and “not go” plug gauges must be used.BS4999-147:1988 4 BSI 07-1999 a) Tolerances for brush-holders The tolerance values for the t dimension shown inTable I are mainly for use with radial brushes. It is recognized that, under certain conditions (e.g.w
41、ith reaction brush-holders) where the brush stability does not depend on the fit of the brush in the holder, the maximum clearance between the brush and the brush-holder is unimportant. b) Split brushes Unless otherwise agreed by the user and the supplier, the tolerance of the value t of a set of sp
42、lit brushes is increased by204m (or0,8 thousands of an inch) by reducing its lower limit, whilst maintaining its upper limit unchanged. c) Metal-graphite brushes For those grades of brushes which have an abnormally high thermal expansion, for example certain metal graphite and unburnt graphite grade
43、s, the nominal dimensions given in Table I shall be reduced by an amount at the discretion of the brush manufacturer, and the above tolerances be applied to the dimensions so reduced. These brushes shall, however, be designated by the nominal values ofTable I. In order to facilitate inspection, the
44、brush manufacturer shall state the reduced nominal dimensions when dispatching the brushes.BS4999-147:1988 BSI 07-1999 5 6 Recommended combinations of the principal dimensions t, a and r Table II Preferred combinations t a are printed in bold-face type, as are the preferredvaluesof r. Dimensionsinmi
45、llimetresBS4999-147:1988 6 BSI 07-1999Table II Preferred combinations t a are printed in bold-face type, as are the preferredvaluesof r. Dimensionsinmillimetres NOTE 1Square section brushes are not recommended by the IEC. NOTE 2Care should be exercised when contemplating using brushes with high r va
46、lues that they can be satisfactorily used inthedesign of brush-holder in use. NOTE 3If for any special purposes brushes with greater r values than in the above tables are required, the values should be selected from the list of Standard Dimensions in Clause 3.BS4999-147:1988 BSI 07-1999 7 Table III
47、Dimensions in inchesBS4999-147:1988 8 BSI 07-1999Table III Dimensions in inches NOTE 1Square section brushes are not recommended by the IEC. NOTE 2Care should be exercised when contemplating using brushes with high r values that they can be satisfactorily used inthedesign of brush-holder in use. NOT
48、E 3If for any special purposes brushes with greater r values than in the above tables are required, the values should be selectedfrom the list of Standard Dimensions in Clause 3.BS4999-147:1988 BSI 07-1999 9 Section 2. Complementary dimensions of brushes terminations of brushes 7 Complementary dimen
49、sions of brushes 7.1 Chamfers for brushes An angle of45 is recommended for the chamfer of brushes. The values of dimension c, according toFigure 3, are related to the dimensions t or a of the brush are given inTable IV andTable V. Figure 3 Table IV Table V Dimensions in millimetres Dimensions in inches The smallest of dimensions t or a Brushes Values of chamfer c Dimensions t or a whichever is the smaller c Minimum Maximum
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