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1、BRITISH STANDARD AEROSPACE SERIES BS G 102:1971 Specification for General requirements for rotating electrical machinery UDC 629.7.066:621.313 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:22:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 102:1971 This
2、British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board of the Institution on 23 April 1971 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/42 Draft for commen
3、t 70/13567 ISBN 0 580 06169 8 Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:22:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 102:1971 BSI 02-2000i Contents Page Forewordii 1Scope1 2Definitions1 3
4、Bearings1 4Lubrication1 5Rotor balance1 6Brushgear1 7Commutators and slip rings2 8Assessment of commutation2 9Cooling2 10Mounting flanges and drive shafts2 Appendix A Details of connections for air cooling3 Figure 1 Assembly of connection for air cooling3 Figure 2 Detail of flexible connectors3 Figu
5、re 3 Detail of pipe fitting profile4 Table 1 Dimensions of connections for air cooling4 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:22:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 102:1971 ii BSI 02-2000 Foreword This British Standard has been compi
6、led to cover the general requirements for rotating electrical machines for aircraft. The general requirements stipulated are for use in conjunction with Aerospace “G” series of British Standards for aircraft rotating electrical machines. The standard has been prepared to supersede those remaining re
7、quirements in BS G 100:1952 relating to rotating machines: its requirements will not be applied retrospectively. Machines designed prior to the implementation of this standard will be used for some time, and consideration will need to be given to the matching-up of new machines with old systems and
8、vice versa. The standard makes reference to the following British Standards: BS F 67, Hose for aviation fuel and engine lubricating oil for aeronautical purposes. BS 3G 100, General requirements for equipment in aircraft Part 1: Identification, declarations and construction1). BS M 32, Dimensions of
9、 aircraft accessory drives and mounting pads. BS M . . . ., Profile dimensions of flanges for vee band couplings2). BS SP 91/92, Hose clips (worm drive type) for aircraft. BS SP. . . to . . . ., Corrosion resisting worm drive clamps for aircraft. BS 292, Dimensions of ball bearings and cylindrical r
10、oller bearings. BS 3851, Glossary of terms used in mechanical balancing of rotating machinery. BS 4362, Rotating electrical machinery Section A1. Dimensions of brushes and brush holders for electrical machines. BS SB . . . . ., Balancing quality of rotating rigid bodies2). NOTEInformation concerning
11、 metric (SI) units is given in BS 350, “Conversion factors and tables”, and PD 5686, “The use of SI units”. 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 S
12、tandard 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 1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be
13、indicated in the amendment table on the inside front cover. 1) Various parts and sections of BS 2G 100 are being progressively revised, renumbered and published as parts or sections of 3G 100. Refer to BS 3G 100-0, “Introduction”, for greater information. 2) In course of preparation. Licensed Copy:
14、London South Bank University, London South Bank University, Sat Dec 09 02:22:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 102:1971 BSI 02-20001 1 Scope This British Standard specifies the requirements which are generally applicable to rotating electrical machines for aircraft, and additional t
15、o the requirements in the relevant parts of BS 3G 100 (see footnote to Foreword). 2 Definitions For the purposes of this British Standard the definitions contained in the following British Standards apply: 1) BS 292 in relation to bearings (Clause 3). 2) BS 3851 in relation to rotor balancing (Claus
16、e 5). 3) BS 4362, Section A1, in relation to brushgear (Clause 6). 3 Bearings 3.1 Bearings and methods of lubrication shall be selected and applied in such a manner as consistently to conform to the declarations in regard to life required by BS 3G 100-1. NOTEThe dangers of excess lubrication or lack
17、 of lubrication should be stressed in the relevant maintenance instructions. 3.2 The design of the bearing arrangements shall be such that the bearings cannot be deleteriously affected by foreign matter such as brush dust, etc. It should be noted that most types of rubbing oil seal must be prevented
18、 from running dry. 3.3 Allowance shall be made for differential expansion in the machine. 3.4 Spinning of the bearings in their housing shall be prevented, but slight rotational creep may be admissible provided it has no deleterious affect. 3.5 Ball and roller bearings shall be so selected that unde
19、r all operational conditions there is a radial internal clearance within the bearing. NOTEGuidance on the selection of appropriate clearance limits is given in Ministry of Aviation Supply Technical Note EL.1653), “Code of Practice for using ball and roller bearings on electrical machines”. 4 Lubrica
20、tion 4.1 Provision shall be made for preventing the undue loss of the grease contained in grease-lubricated bearings. 4.2 The quantity, type and method of lubrication of fluid-lubricated bearings shall be as required by the individual specification. It shall be the responsibility of the designers of
21、 the machine to safeguard the machine against the possible injurious effects of oil ingress. 4.3 When a splined shaft attachment complying with BS M 32 is used, the lubrication requirement in that specification shall be complied with. 4.4 When a splined or serrated shaft attachment not complying wit
22、h BS M 32 is used, adequate lubrication of the spline surface shall be provided. The designers of the driving and driven components shall agree upon and declare the arrangements for the provision of lubrication. 5 Rotor balance In general, the dynamic unbalance of the complete rotor assembly shall n
23、ot exceed 2.5 g mm/kg. Guidance on balancing may be obtained from BS . . . .4), “Balancing quality of rotating rigid bodies”. 6 Brushgear 6.1 Brushgear shall be of rigid construction and dimensionally stable throughout its life. The creepage path between live parts of different polarity, and between
24、 live parts and the frame, shall be such as to ensure that leakage currents due to the accumulation of brush or other contaminants will not give rise to a dangerous condition. A suitable insulating coating shall be applied to the surface of all earthed metal in the vicinity of the brushgear. 6.2 Bru
25、shes should be replaceable without dismantling the machine, and should be insertable one way only. They should be marked to indicate how much of the usable length remains. Flexibles shall be provided on brushes rated to carry more than 200 mA continuously or a correspondingly higher limiting current
26、 intermittently. When necessary the flexibles shall be insulated. 6.3 Provision shall be made for adjustment of the brush position for the best performance, unless the relative location of commutator segments, armature slots and brushgear, etc., is adequately controlled in production to achieve the
27、same result. 6.4 The design of the brushgear shall be such that the brush is adequately supported under all conditions of wear of the brush or commutator. 3) Technical Note EL.165 is now reproduced as Section 4 in R.A.E. Technical Report TR 69088, May 1969 “A collection of some papers on ball bearin
28、g research at R.A.E. from 1958 to 1960”, copies of which may be obtained from the Ministry of Aviation Supply, Royal Aircraft Establishment, Farnborough, Hants. 4) In course of preparation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:22:46 GMT+00:00 2006,
29、 Uncontrolled Copy, (c) BSI BS G 102:1971 2 BSI 02-2000 6.5 The design of the brushgear and the internal surface finish of the brush holders shall be such that the brushes will slide freely under all operational conditions. Springs and triggers shall not jam or foul the brush holders due to wear ove
30、r the declared wearing length of the brush. Brush flexibles shall not restrict the travel of the brushes and shall not foul the springs. The design should be such that adequate spring pressure is maintained throughout the life of the brush. 6.6 The dimensions of brushes and brush holders shall compl
31、y with the requirements of BS 4362:Section A1. 7 Commutators and slip rings 7.1 Care shall be taken in manufacturing to ensure that the commutator or slip ring working surfaces are concentric with the bearing journals. With the armature supported at its journals on vee blocks, the maximum variation
32、in reading on a dial type gauge resting on the commutator or slip ring surface shall not exceed 25 4m for peripheral speeds up to 1 800 m/min or 12 4m for higher speeds. The maximum variation in reading between any two adjacent segments of a commutator shall not exceed 2.5 4m. This check shall be ma
33、de after any routine commutator settling procedure. 7.2 When commutator micas are recessed, care shall be taken in the recessing operation to ensure that the recess is in line with the intersegmental slot and that no fragment of mica is left standing above the bottom of the slot. Each recess shall b
34、e sufficiently deep to allow for commutator wear between overhauls. 8 Assessment of commutation 8.1 When applicable the quality of commutation shall be assessed visually5). Examination shall be made under extreme conditions of load and speed (e.g. in the case of a variable-speed d.c. generator, at m
35、aximum speed under rated load and no-load, and minimum speed under rated load and no-load). 8.2 For type tests, on interpole machines, it is recommended that a black band test should be made6). 9 Cooling 9.1 Air cooling 9.1.1 When required by the individual specification the air cooling characterist
36、ics shall be declared in accordance with approved rating data charts7). 9.1.2 Unless otherwise required by the individual specification the connections for air cooling shall conform to the dimensions shown in either: 1) BS M. . .8), “Profile dimensions of flanges for vee band couplings”. or 2) Appen
37、dix A. 9.2 Liquid cooling 9.2.1 The requirements for liquid cooling, such as flow, type of fluid, pressure and relevant tests, shall be declared as specified in the individual specification. 9.2.2 The method of connection shall be as specified in the individual specification. 10 Mounting flanges and
38、 drive shafts The dimensions for drives and mounting flanges should preferably be in accordance with BS M 32. 5) A colour chart suitable for this purpose, Air Diagram 7555 is available from Ministry of Aviation Supply, O.S.C. when metric hoses are generally available it is intended to amend this sta
39、ndard accordingly. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:22:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:22:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
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