BS 2G 146-1966 Specification for d c motors for aircraft《飞行器用直流电动机规范》.pdf

1、BRITISH STANDARD BS2G146: 1966 Specification for D.C. Motors for aircraft UDC 629.13.066:621.313.2-89BS2G 146:1966 This British Standard, having been approved by the AerospaceIndustry StandardsCommittee and endorsed by the Chairman oftheEngineering Divisional Council, was published undertheauthority

2、 of the GeneralCouncil of the Institution on 30 December 1966 BSI 01-2000 The following BSI references relate to the work on this Standard: Committee reference ACE/42 Draft for comment 66/7767 ISBN 0 580 34125 9 Amendments issued since publication Amd. No. Date CommentsBS2G 146:1966 BSI 01-2000 i Co

3、ntents Page Foreword ii 1 Scope 1 2 Definitions 1 3 Design and construction 1 4 Supply voltage 1 5 Overhaul periods 1 6 Rotation 1 7 Rating 1 8 Cooling 1 9 Mounting and drive 1 10 Vibration, acceleration and climatic proofing 1 11 Compass safe distance 2 12 Radio interference 2 13 Explosion-proofnes

4、s 2 14 Fire-resistance 2 15 Waterproofing 2 16 Declaration of performance 2 17 Nameplate 2 18 Tests: General 2 19 Type tests 2 20 Production routine tests 5 21 Production quality tests 6BS2G 146:1966 ii BSI 01-2000 Foreword This standard is a revision of BS G 146:1955and has been prepared as part of

5、 a programme of work to bring the aircraft series British Standards for rotating machines up to date in relation to present-day and probable future requirements, and to experience gained in working to earlier issues of the standards. Reference is made in the standard to the following British Standar

6、ds: BS2G100, General requirements for electrical equipment and indicating instruments for aircraft. BS G 102, General requirements for rotating electrical machines for aircraft 1) . NOTEWhere metric equivalents are given, the figures in British units are to be regarded as the standard. The metric co

7、nversions are approximate. More accurate conversions should be based on the tables in BS350, “Conversion factors and tables”. 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. Complianc

8、e 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 1to 6and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporate

9、d. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation.BS2G 146:1966 BSI 01-2000 1 1 Scope This British Standard covers the general design and test procedure for d.c. motors for use in aircraft, other than engine starter motors. 2 Definitions For the

10、purposes of this British Standard the following definitions apply: NOTEThe term “motor” includes gears supplied with the motor. 2.1 type motor a motor representative of others identical in design, construction and rating 2.2 rating the operating limitations assigned to the motor by the manufacturer

11、2.3 rated speed and torque the speed and torque declared by the manufacturer for nominal voltage 2.4 time rating the time for which the motor can be operated at rated torque without exceeding the safe temperature 3 Design and construction The design and construction of the motor shall comply with th

12、e relevant requirements of BS2G100and BS G 102. 4 Supply voltage The motor shall be suitable for use on direct current supplies having the characteristics specified in BS2G100-3. 5 Overhaul periods Unless otherwise required by the individual specification, the motors shall be suitable for the follow

13、ing periods of unattended bench operation before requiring maintenance. The design aim should be to achieve3000(aircraft) hours operation of the motor before requiring overhaul. 6 Rotation Motors shall be marked with an arrow to show the direction of rotation. For reversible motors the relationship

14、between the direction of rotation and the supply connections shall be stated. 7 Rating 7.1 The manufacturer shall declare the rated torque(s) and speed(s) at the nominal terminal voltage, and the time rating(s) for the declared ambient temperature(s). The manufacturer shall declare any limitation of

15、 the frequency of operation and the ON and OFF time periods for continuously repeated operation. 7.2 Any variation in rating due to the method of mounting shall be agreed between the manufacturer and the purchaser. NOTEShort-time rated motors are generally required to be capable of performing at lea

16、st three consecutive operations without rests for cooling. Therefore the time of one operation should not exceed one third of the time rating of the motor, i.e. thetime for which the motor can be operated at rated torque without exceeding the safe temperature. For actuators this means6operations of

17、the motor. 8 Cooling 8.1 The manufacturer and purchaser shall agree upon the cooling arrangements to be provided for the motor. 8.2 Cooling connections shall comply with the requirements of BS G 102. 9 Mounting and drive 9.1 The mounting and drive of the motor shall comply with the requirements of B

18、S G 102. 9.2 There should preferably be no limitation in the performance of the motor in respect of the attitude in which it may be mounted. Any such limitations shall be declared. 10 Vibration, acceleration and climatic proofing The motor shall comply with the requirements of BS2G100-2in respect of

19、: 1) continuous duty 1000hours operation. 2) 3) frequent duty (e.g. with an inching actuator). infrequent duty 75hours total running time in accordance with the relevant duty cycle. 4) limited life (stand-by emergency duty). not less than5% of the performance of1, 2, or3, as appropriate. 1) vibratio

20、n 2) acceleration 3) climatic test to the performance grading declared by the manufacturer. BS2G 146:1966 2 BSI 01-2000 11 Compass safe distance The motor shall comply with the requirements of BS2G100-2in respect of compass safe distance. 12 Radio interference If required by the individual specifica

21、tion, the motor shall comply with the requirements of BS2G100-2for freedom from radio noise. 13 Explosion-proofness If required by the individual specification, the motor shall comply with the requirements of BS2G100-2for explosion-proof equipment. Motors ventilated other than by clean air shall com

22、ply with these requirements whilst running. 14 Fire-resistance A motor which is to be installed within a potential fire zone and which must function during or after a fire, shall comply with the appropriate requirements for fire resistance specified in BS2G100-2, as declared by the manufacturer. 15

23、Waterproofing If required by the individual specification, the motor shall comply with the requirements of the Grade A or Grade B water-proofness tests described in BS2G100-2, as declared by the manufacturer. 16 Declaration of performance In addition to the declarations required by BS2G100, the foll

24、owing information shall be provided by the manufacturer in regard to the motor: 1) Rated torque(s), speed(s), direction of rotation and current. 2) Time rating(s). 3) Cooling requirements. 17 Nameplate 17.1 A nameplate and, where possible, a modification plate shall be mounted on the body of the mot

25、or. 17.2 The following information shall be marked on the nameplate: 1) Manufacturers name or identification. 2) Serial number. 3) Type (or part) number. 4) Stores reference number, when applicable. 17.3 If possible, the following information should also be marked on the nameplate: 1) Voltage. 2) Sp

26、eed. 3) Output in watts. 4) Time rating. 17.4 The modification plate shall provide for ten modification references. If the motor is too small to accommodate a modification plate, another form of identifying modification shall be agreed with the Approving Authority. 18 Tests: general 18.1 Tests shall

27、 be made to prove compliance with all requirements of this British Standard. The tests required are as follows: the results obtained shall be recorded. Type tests. 19.1 to 19.17, to be made on each design of motor. Production routine tests. 20.1 to 20.5, to be made on every motor manufactured to thi

28、s British Standard. Production quality tests. 21.1 to 21.5, to be made on batch sample or samples. 18.2 The tests prescribed in 19.2 to 19.11 inclusive shall be performed in that order on the same motor. Similarly, tests in 19.12 shall be made on one motor, but not necessarily on the motor used for

29、the test referred to above, which shall previously have been subjected to the test in 19.3.1. Other type tests may be made on another motor or motors. Every motor used for type test purposes shall previously have passed tests equivalent to the production routine tests. 18.3 Tests shall be made at th

30、e maximum and minimum voltages specified in BS2G100-3or in the individual specification. Unless otherwise specified, the tests shall be made at a temperature of20 5 C, any departure from this temperature being recorded. 19 Type tests 19.1 Preliminary inspection and preparation for test. The principa

31、l components shall be dimensionally checked against the relevant drawings, a record made of the parts liable to wear, and a check made that the brushes are bedded over the full arc for at least 80% of their axial width. Any running required to condition the commutator surface shall be done prior to

32、the commencement of the tests. 19.2 Resistance test. The resistances of the windings shall be measured and the values corrected to20 C.BS2G 146:1966 BSI 01-2000 3 19.3 Load test 19.3.1 For a range of output torques from zero to150% of the rated torque the current and speed shall be measured at the m

33、aximum and minimum terminal voltages specified in BS2G100-3, or in the individual specification. If the motor is reversible these tests shall be made for both directions of rotation. The currents and speeds shall be plotted on a torque base and the values at rated torque thus derived for each direct

34、ion of rotation shall be within five per cent of their respective average values. In addition, the efficiency and shaft output power shall be calculated from the observed data and plotted on a torque base. 19.3.2 On motors supplied complete with gears, the test in 19.3.1 shall be repeated with the g

35、earing removed. The efficiency of the gearing at various torques shall be derived and plotted. 19.4 Stall test. With the armature locked against rotation, measurements of current and torque shall be recorded and the values plotted over a range of applied voltage from zero to maximum or as high as is

36、 practicable without overheating. The test shall be repeated with the armature locked in several other positions. 19.5 Temperature test 19.5.1 For the purpose of the test continuously rated motors shall be run without stopping at rated torque and maximum test voltage for a time sufficient to allow t

37、hem to attain steady temperature conditions. Short time rated motors shall be run continuously at rated torque and maximum test voltage for a period equal to110per cent. of their time rating. Motors up to1.8in frame diameter shall be tested on the appropriate standard mounting plate which shall be v

38、ertically on a base of heat-insulating material. The motor shall be held on the plate by the normal mounting means. The plate shall be polished aluminium alloy and shall have the following dimensions: Where applicable, coolant flow shall be maintained at the agreed rate and maximum temperature uninf

39、luenced by the method of loading, and the pressure drop shall be recorded. 19.5.2 Before commencing the test, and while the motor is cold, the resistance and temperature of all the field windings shall be measured and these results shall be used in calculating the final field winding temperatures. W

40、here practicable the temperature rise of the following parts of the motor shall be measured by the change of resistance or thermocouple method: 1) windings (except armature); 2) brush; 3) commutator. Any additional measurement that may be considered necessary, together with the method to be used, wi

41、ll be indicated in the individual specification. 19.5.3 At the conclusion of the test the temperature rise of the parts of the motor already indicated shall be such that under the worst combination of climatic and altitude conditions, the internal temperature at any point does not exceed the safe li

42、mits for the material employed. NOTENo arbitrary temperature limits are specified for the various materials. In every case the situation and manner of application of the material must be considered, as well as the effect of wide variations of temperature and mechanical vibration which are inherent i

43、n the operating conditions. For solder, the softening point and not the melting point is the criterion. Nominal frame size Hole at centre of plate Side of plate Thickness of plate in mm in mm in mm in mm +0.001 0 0.7 17.8 0.501 12.7 1.875 47.6 0.1250 3.2 0.8 20.3 0.501 12.7 2.250 57.2 0.1250 3.2 0.9

44、 22.9 0.501 12.7 2.700 68.6 0.1250 3.2 1.1 27.9 1.001 25.4 3.200 81.3 0.1250 3.2 1.3 33.0 1.157 29.4 3.750 95.3 0.1875 4.8 1.5 38.1 1.313 33.4 4.300 109.2 0.1875 4.8 1.8 45.7 1.563 39.7 5.250 133.4 0.1875 4.8BS2G 146:1966 4 BSI 01-2000 19.6 Cold test. The motor shall be brought to the declared minim

45、um ambient operating temperature throughout. While at this temperature the motor shall be placed in a humidity chamber controlled at not less than95% humidity at any temperature between15 C and25 C until the hoar frost formed on the motor has liquefied. As soon as this has occurred the motor shall b

46、e returned to the cold chamber and brought again to the declared minimum ambient temperature. It shall then be started and operated at rated torque and minimum voltage until it reaches constant speed. The approximate time taken to reach constant speed shall be noted. 19.7 Hot test. The motor shall b

47、e brought to the declared maximum ambient operating temperature throughout and then run at rated voltage and rated torque for its time rating, or for30minutes if it is continuously rated. During the test the speed and input current of the motor shall be recorded. 19.8 Overspeed test. Continuously ra

48、ted motors shall be run at rated torque and nominal voltage for half an hour followed immediately by a period of three minutes no load at125% of the maximum operating speed in order to check that the noise and vibration are not abnormal. For short-time rated motors the three-minute run shall be comm

49、enced with the motor cold. The motor shall be subjected to the test in 19.9 and shall then be stripped and examined. There shall be no signs of relative movement or of damage to the field system or armature/commutator assembly. 19.9 Insulation resistance tests. While the windings are still hot from the tests in 19.8 the motor shall be subjected to an insulation resistance test in accordance with BS2G100-2, except that the resistance between live parts and the frame shall not be less than2megohms when measured at250V d.c. 19.10 Altitude tests 19.10.1 The m