1、BRITISH STANDARD BS 4999-103:2004 General requirements for rotating electrical machines Part 103: Specification for symbols ICS 29.160.30 BS 4999-103:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 22 April 2004 BSI 22 April 2004 First p
2、ublished as BS 4999-2 May 1976 Second edition as BS 4999-103 February 1987 Third edition April 2004 The following BSI reference relates to work on this British Standard: Committee reference PEL/2 ISBN 0 580 43586 5 Committees responsible for this British Standard The preparation of this British Stan
3、dard was entrusted to Technical Committee PEL/2, Rotating electrical machinery, upon which the following bodies were represented: Association of Consulting Engineers Association of Electrical and Mechanical Trades Association of Manufacturers of Power Generating Systems Electrical Insulation Associa
4、tion Electricity Association GAMBICA Association Limited Institution of Incorporated Executive Engineers Ministry of Defence UK Defence Standardization Rotating Electrical Machines Association (BEAMA Ltd.) Society of Operations Engineers UK Offshore Operators Association Limited Amendments issued si
5、nce publication Amd. No. Date CommentsBS 4999-103:2004 BSI 22 April 2004 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Symbols for dimensions 1 Annex A (informative) System of frame nomenclature 5 Bibliography 7 Figure 1 Shaft end and keyway 2 Figure 2 Detail o
6、f tapped hole or holes in shaft extension 2 Figure 3 Symbols for skirt-mounted frames 3 Figure 4 Symbols for pad-mounted or rod-mounted frames 4 Figure 5 Symbols for slide rails 4 Table 1 Symbols for dimensions 1BS 4999-103:2004 ii BSI 22 April 2004 Foreword This part of BS 4999 has been prepared by
7、 Technical Committee PEL/2. Together with BS EN 50347:2001 it supersedes BS 4999-103:1987, which is withdrawn. Symbols for dimensions of general purpose three-phase induction motors are now given in BS EN 50347. This new edition of BS 4999-103 specifies symbols for dimensions of skirt-mounted motors
8、, pad-mounted motors, slide rails and shaft ends with two tapped holes, all of which are outside the scope of BS EN 50347. In addition, BS 4999-141:2004 includes requirements for shaft ends and keyways, and shaft extensions with single tapped holes, for motors which are above the size range covered
9、by BS EN 50347. Therefore, for completeness, this new edition of BS 4999-103 also specifies the relevant symbols for dimensions of shaft ends and keyways and shaft extensions with single tapped holes. This new edition of BS 4999-103 incorporates changes necessitated by the publication of BS EN 50347
10、. It does not represent a full review or revision of the standard, which will be undertaken in due course. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself
11、 confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 4999-103:2004 BSI 22 April 2004 1
12、1 Scope This part of BS 4999 specifies symbols for identification of dimensions of frame sizes for rotating electrical machines which are outside the scope of BS EN 50347. It specifies symbols for dimensions of skirt-mounted motors, pad-mounted motors, slide rails, shaft ends and keyways, and shaft
13、ends with one or with two tapped holes. NOTE Information on the system of frame nomenclature applicable to the motors covered by this part of BS 4999 is given in Annex A. 2 Symbols for dimensions Symbols for dimensions shall be as specified in Table 1. NOTE The dimensions are illustrated in Figure 1
14、, Figure 2, Figure 3, Figure 4 and Figure 5. Table 1 Symbols for dimensions Letter symbol Description of dimension B Distance between centre lines of fixing holes (side view) C Distance from centre line of fixing holes at drive end to shaft shoulder D Diameter of shaft extension E Length of shaft ex
15、tension from shoulder F Width of keyway G Distance from bottom of keyway to opposite side of shaft J Radius of circle to which mounting pads (or faces for rods) are tangent K Diameter of holes in mounting pads (or faces) L Overall length M Pitch circle diameter of fixing holes N Diameter of spigot P
16、 Outside diameter of flange R Distance from surface of mounting flange to shaft shoulder S Diameter of fixing holes in flange T Depth of spigot AA Width of end of pad (end view) AC Overall diameter AD Distance from centre line to extreme outside of terminal box (end view) or other salient object mou
17、nted on side of machine AL Overall length of slide rail excluding adjusting screw AT Thickness of slide rail adjusting foot AU Diameter of mounting holes in slide rail AX Height of slide rail AY (max.) Maximum extension of adjusting screw of slide rail AZ Width of slide rail at base BB Overall dimen
18、sion across pad or pads BT (min.) Minimum horizontal travel on slide rail DH Diameter of tapped hole or holes in shaft extension DJ Centre distance of two tapped holes in shaft extension EB Length of key at drive end EC Length of key at non-drive end EF Length of shaft from end of bearing housing to
19、 end of shaft HB Distance from centre line to top of lifting device, terminal box or other most salient object mounted on top of the machineBS 4999-103:2004 2 BSI 22 April 2004 Table 1 Symbols for dimensions (continued) Letter symbol Description of dimension KA Usable tapped depth of hole in pad (or
20、 facing) of pad-mounted (or rod-mounted) machine KK Diameter of holes in terminal box for cable entry LA Thickness of flange LB Distance from fixing face of flange to non-drive end LD Distance from centre line of terminal box to fixing face of flange LE Distance from extreme point of non-drive end t
21、o centre line of nearest fixing hole in pad LF Distance from end of shaft to fixing face of skirt-mounting flange LK Distance from end of bearing housing (drive end) to centre line of nearest fixing hole in pad LL Distance from centre line of terminal box to centre line of fixing holes in pad neares
22、t to shaft extension XA (max.) Maximum distance from centre line of bolt at adjusting screw end of slide rail to the beginning of the platform XB Width of slide rail at top XC Bolt diameter for which clearance is provided in the slot of the slide rail XD Height of adjusting screw centre line above t
23、he platform XE Distance between the centre lines of the mounting-bolt holes (side view) XF Distance between the centre line of the mounting-bolt hole at the adjusting screw end and the adjacent end of the slide rail Figure 1 Shaft end and keyway Figure 2 Detail of tapped hole or holes in shaft exten
24、sion E EB/EC F G D D DJ 60 DH DHBS 4999-103:2004 BSI 22 April 2004 3 Key 1 Four or eight holes, diameter S, equally spaced NOTE See Figure 1 for details of shaft extension. Figure 3 Symbols for skirt-mounted frames N HB HB AC AD R E LF KK P L LB LD LA T 1 MBS 4999-103:2004 4 BSI 22 April 2004 NOTE 1
25、 See Figure 1 for details of shaft extension. NOTE 2 For rod-mounted motors, the facing of the rod fixing need not extend beyond that required for a standard washer appropriate to a rod threaded to suit dimension K. a Useable tapped depth of hole KA. Figure 4 Symbols for pad-mounted or rod-mounted f
26、rames Key 1 A third bolt hole of diameter AU and an additional foot are provided on sizes M 2528 and M 3100. Figure 5 Symbols for slide rails AC EF LK LL LE E C B BB L KK K J HB AA a AU XC AL XB 1 = = XA BT XD AZ AX AT XE XF AYBS 4999-103:2004 BSI 22 April 2004 5 Annex A (informative) System of fram
27、e nomenclature A.1 For frame sizes up to and including 400, which are primarily intended for low voltage induction type motors, the nomenclature is given in A.2, A.3, A.4 and A.5. For other machines where there is no international agreement, it is recommended that A.6 should be used. A.2 Firstly a l
28、etter indicating the enclosure: C for enclosed ventilated; D for totally enclosed (other than flameproof). A.3 Secondly, a number of two or three digits, which is the height in millimetres of the shaft centre above the feet (dimension H) on a foot-mounted frame (see BS EN 50347). A.4 Thirdly, a lett
29、er S, M or L which characterises the longitudinal dimensions (short, medium or long) where more than one length is used, as given in BS 4999-141. A.5 Fourthly, for other than foot-mounted frames, a letter that indicates the type of mounting: D for flange mounting; V for skirt mounting; P for pad mou
30、nting; R for rod mounting. NOTE For example, a totally enclosed fan-ventilated motor of frame size 160M, suitable for skirt mounting is designated D160MV. A.6 For machines with high shaft centres, a combination of two numbers H/B. (For meaning of H see BS EN 50347.) For machines with low shaft centr
31、es, a combination of three numbers H/H /B. (For meaning of H and H see BS EN 50347.) Values should be selected from the appropriate tables in BS 4999-141.6 blankBS 4999-103:2004 BSI 22 April 2004 7 Bibliography BS 4999-141:2004, General requirements for rotating electrical machines Part 141: Specifi
32、cation for standard dimensions. BS EN 50347:2001, General purpose three-phase induction motors having standard dimensions and outputs Frame numbers 56 to 315 and flange numbers 65 to 740.BS 4999-103:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independen
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