1、BRITISH STANDARD BS 2G 147-2:1966 Specification for A.C. motors for aircraft Part 2: Three-phase variable frequency squirrel-cage induction motors UDC 629.13.066:621.313.333.2.025.3BS2G147-2:1966 This British Standard, having been approved by the AerospaceIndustry StandardsCommittee and endorsed by
2、theChairman oftheEngineering DivisionalCouncil, was publishedunder theauthorityofthe GeneralCouncil of the Institutionon 12December1966 BSI 01-2000 The following BSI references relate to the work on this Standard: Committee reference ACE/42 Draft for comment 66/7396 ISBN 0 580 34073 2 Amendments iss
3、ued since publication Amd. No. Date CommentsBS2G147-2:1966 BSI 01-2000 i Contents Page Foreword ii 1 Scope 1 2 Definitions 1 Section 1. General requirements 3 Design and construction 1 Section 2. Particular requirements 4 Supply voltage and frequency 1 5 Overhaul periods 1 6 Rotation 1 7 Rating 1 8
4、Cooling 1 9 Performance 2 10 Mounting and drive 2 11 Vibration, acceleration, climatic proofing and compass safe distance 2 12 Explosion-proofness 2 13 Fire resistance 2 14 Waterproofing 2 15 Declaration of performance 2 16 Nameplate 2 Section 3. Tests 17 General 3 18 Resistance test 3 19 Load tests
5、 3 20 Starting test 3 21 Run-up torque test 3 22 Temperature test 3 23 Cold test 4 24 Hot test 4 25 Overspeed test 4 26 Insulation resistance test 4 27 Endurance tests 4 28 Acceleration, vibration and climatic tests 5 29 Waterproofing tests 5 30 Explosion-proofness test 5 31 Fire resistance test 5 3
6、2 Component check 5 33 Overspeed test 5 34 Load test 5 35 Starting torque test 5 36 Insulation tests 5 37 Selection of samples 6 38 Load tests 6 39 Starting test 6 40 Run-up torque test 6 41 Endurance tests 6 42 Dimensional check for wear 6BS2G147-2:1966 ii BSI 01-2000 Foreword This standard has bee
7、n prepared as part of 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. It is intended that the standard, when comple
8、ted, shall cover the whole range of a.c. motors for aircraft applications in a series of separate Parts. Part 1, being a revision of BS G 147:1955, deals with constant frequency motors, and Part2with variable frequency motors. Reference is made in the standard to the following British Standards: BS
9、2G 100, 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 convers
10、ions are approximate. More accurate conversions should be based on the tables in BS 350, “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. Compliance wi
11、th 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, pages1 to 6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated.
12、This will be indicated in the amendment table on the inside front cover. 1) In course of preparation.BS2G147-2:1966 BSI 01-2000 1 1 Scope This part of BS G147 covers the general design and test procedure for three-phase variable frequency a.c. squirrel-cage induction motors for use in aircraft, othe
13、r than motors classed as engine starter motors. 2 Definitions For the purposes of this part of BS G147the following definitions apply: 2.1 motor the term “motor” includes gears supplied with the motor 2.2 type motor a motor representative of others identical in design, construction and rating 2.3 ra
14、ting the operating limitations assigned to the motor by the manufacturer 2.4 rated speeds and torques the speeds and torques declared by the manufacturer for nominal voltage and for specific frequencies, as required by the purchaser. Generally these values should be quoted for maximum, minimum, and
15、nominal frequency 2.5 time rating the time for which the motor can be operated at rated torque without exceeding the safe temperature Section 1. General requirements 3 Design and construction The design and construction of the motor shall comply with the relevant requirements of BS2G100 and BSG 102.
16、 Section 2. Particular requirements 4 Supply voltage and frequency a) The motor shall be suitable for use on supplies with a line voltage as specified in BS 2G 100-3 2) , and a variable frequency as specified by the purchaser. b) Unless otherwise agreed, the nominal frequency shall be 400 Hz. 5 Over
17、haul periods Unless otherwise required by the individual specification, the motors shall be suitable for the following 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 Rota
18、tion Motors shall be marked with an arrow to show the direction of rotation with a supply of phase sequence A, B, C connected to terminals A, B, C respectively. For reversible motors the relationship between the direction of rotation and the supply connections shall be stated. 7 Rating The manufactu
19、rer shall declare the rated torque(s) and speed(s) at the nominal terminal voltage and at some specific frequencies; preferably, these should be maximum, minimum and nominal frequency. Time ratings for the declared ambient temperatures shall be stated. The manufacturer shall declare any limitation o
20、f the frequency of operation and the ON and OFF time periods for continually repeated operation. Any variation in rating due to the method of mounting of a motor shall be agreed between the manufacturer and the purchaser. NOTEShort-time rated motors are generally required to be capable of performing
21、 at least 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.the time for which the motor can be operated at rated torque without exceeding the safe temperature. For actuators this means six ope
22、rations of the motor. 8 Cooling a) The manufacturer and purchaser shall agree upon the cooling arrangements to be provided for the motor. 2) BS 2G 100-3:1960 is being revised to include requirements for variable frequency a.c. systems. a) continuous duty 1500 hours operation b) frequent duty (e.g. w
23、ith an inching actuator) 75 hours total running time in accordance with the relevant duty cycle. c) infrequent duty d) limited life (standby emergency-duty) not less than 5 per cent of the performance of a), b), or c), as appropriate BS2G147-2:1966 2 BSI 01-2000 b) Cooling connections shall comply w
24、ith the requirements of BS G 102. 9 Performance a) 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. b) Unless otherwise specified in the individual specification, at minimum voltage
25、 and maximum frequency the following relationships shall obtain: Starting current at maximum voltage and minimum frequency shall not exceed six times the full-load current specified for this particular frequency. 10 Mounting and drive The mounting and drive of the motor shall comply with the require
26、ments of BS G 102. 11 Vibration, acceleration, climatic proofing and compass safe distance The motor shall comply with the requirements of BS2G 100-2 in respect of: 12 Explosion-proofness If specified by the individual specification the motor shall comply with the requirements of BS 2G 100-2 for exp
27、losion-proof equipment. Motors ventilated other than by clean air shall comply with these requirements whilst running. 13 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 of BS
28、 2G 100-2, in respect of fire resistance, as declared by the manufacturer. 14 Waterproofing If required by the individual specification, the motor shall comply with the requirements of the Grade A or Grade B water-proofness tests of BS 2G 100-2, as declared by the manufacturer. 15 Declaration of per
29、formance In addition to the declarations required by BS2G100, the following information shall be provided by the manufacturer in regard to the motor: a) Rated torque(s), speed(s), direction of rotation, currents and power factors at maximum, minimum and nominal frequency. b) Time ratings at the freq
30、uencies stated in a). c) Cooling requirements at the frequencies stated in a). d) Starting, run-up and pull-out torque at minimum voltage and maximum frequency. e) Starting current and power factor for maximum voltage and minimum frequency. 16 Nameplate a) A nameplate and, where possible, a modifica
31、tion plate shall be mounted on the body of the motor. b) The following information shall be marked on the nameplate: Manufacturers name or identification Serial number Type (or part) number Stores reference number, when applicable c) If possible, the following information should also be marked on th
32、e nameplate: Voltage and frequency range Number of phases Speed range Output in watts at maximum and minimum frequency Time rating Starting torque torated torque: not less than 1.25 for short-time rated motors, and not less than 1.1 for continuously rated motors Pull-out torque torated torque: not l
33、ess than 1.5 Run-up torque i.e.the minimum torque occurring between pull-out and starting torque, to rated torque: not less than1.1 a) vibration to the performance grading declared by the manufacturer b) acceleration c) climatic test d) compass safe distance BS2G147-2:1966 BSI 01-2000 3 d) The modif
34、ication 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. Section 3. Tests 17 General a) Tests shall be made to prove compliance with all requireme
35、nts of this British Standard. The tests required are as follows: the results obtained shall be recorded. Type tests. (Clauses 18 to 31) to be made on each design of motor. Production routine tests. (Clauses 32 to 36) to be made on every motor manufactured to this British Standard. Production quality
36、 tests. (Clauses 37 to 42) to be made on batch sample or samples. b) The tests prescribed in Clauses 18 to 27 inclusive shall be performed in that order on the same motor. Similarly, tests in Clause 28 shall be made on one motor, but not necessarily on the motor used for the tests referred to above,
37、 which shall previously have been subjected to the test in Clause 19 a). 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. Tests shall be made at the maximum or minimum volta
38、ges specified in BS 2G 100-3 or 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. Type tests 18 Resistance test The resistance of the windings shall be measured and the values corrected
39、to20 C. 19 Load tests a) The current consumption, power factor and speed shall be recorded over a range of output torques from zero to pull-out torque for the three following input conditions: i) Maximum voltage and minimum frequency. ii) Nominal voltage and nominal frequency. iii) Minimum voltage a
40、nd maximum frequency. At rated load and balanced terminal voltage, the maximum difference between line currents shall not be greater than10per cent of the average of the three currents. b) On motors supplied complete with gears, the test in a) shall be repeated with the gearing removed. The efficien
41、cy of the gearing at the various torques shall be derived and plotted. 20 Starting test With the rotor just turning, measurements of current, input power and torque shall be recorded and the values plotted over a range of applied voltage from zero to nominal at maximum frequency. The starting curren
42、t at maximum voltage and minimum frequency shall be checked. 21 Run-up torque test The run-up torque shall be recorded at minimum voltage and maximum frequency. 22 Temperature test Continuously rated motors shall be tested under the worst conditions of temperature and altitude. They shall be run con
43、tinuously at their rated torques corresponding to minimum voltage and maximum frequency and to maximum voltage and minimum frequency respectively until steady temperature conditions are reached. Short-time rated motors shall be run at normal ambient temperature at their rated torques corresponding t
44、o minimum voltage and maximum frequency and maximum voltage and minimum frequency respectively for a period equal to110per cent of the time rating(s) of the motor. Motors up to1.8in frame diameter shall be tested on the appropriate standard mounting plate which shall be held vertically on a base of
45、heat-insulating material. The motor shall be held in position by the normal mounting means. The plate shall be polished aluminium alloy and shall have the following dimensions: Nominal frame size Hole at centre of plate Sides of plate Thickness of plate in mm in mm in mm in mm 0.7 0.8 0.9 1.1 1.3 1.
46、5 1.8 17.8 20.3 22.9 27.9 33.0 38.1 45.7 + 0.001 0 0.501 0.501 0.501 1.001 1.157 1.313 1.563 12.7 12.7 12.7 25.4 29.4 33.4 39.7 1.875 2.250 2.700 3.200 3.750 4.300 5.250 47.6 57.2 68.6 81.3 95.3 109.2 133.4 0.1250 0.1250 0.1250 0.1250 0.1875 0.1875 0.1875 3.2 3.2 3.2 3.2 4.8 4.8 4.8BS2G147-2:1966 4
47、BSI 01-2000 Where applicable, coolant flow shall be maintained at the agreed rate and maximum temperature uninfluenced by the method of loading, and the pressure drop shall be recorded. 23 Cold test The motor shall be brought to the declared minimum ambient operating temperature throughout. While at
48、 this temperature the motor shall be placed in a humidity chamber controlled at not less than95per cent 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 be returned to the cold chamber and brought aga
49、in to the declared minimum ambient temperature. It shall then be started and operated and rated torque at minimum voltage and maximum frequency until it reaches constant speed. The approximate time taken to reach constant speed shall be noted. 24 Hot test The motor shall be brought to the declared maximum ambient operating temperature throughout and then run at minimum voltage and maximum frequency and rated torque for its time rating, or for30minutes if it is continuously rated. During the test the current and input power of the motor shall be recorded. 25 Ov
