1、_- MIL-S-17806( Nord) 24. November 1953 SERVO MILITARY SPECIFICATION MOTOR - TACHOIYIETER GENERATOR 2-PHASE, 4.00 CYCLE 1. SCOPE 1.1 requiremen + s, and inspection and test procedures applicable to 2-phase, li5 volt 4-00 cycle servo motors that are integrally mounted with and connected to 400 cycle
2、tachometer generators. SCO e - This specification outlines specifications, 1.2 Classifications - This specification ccyers the following servo motors: Servo Motor IJlk 12 Nod O Servo Motor Mk 12 Mod 1 Servo Rotor Ivik 16 Nod O SePvo blotor fik 16 Mod 1 2 . APPLICABLE SPECIFICATIONS, STANDARDS, DRAWI
3、NGS, AND PUBLICATIONS 2.1 The following specifications, standards, drawings and publications in effec2 on the date of invitation for.bids form a part of this specification: SPECIFICATIONS : Federal : NN-B-601, Boxes, Vood-Cleat ed-Plywood, for NN-B-621, Boxes, Wood, Nailed and Lock-Corner General Sp
4、ecifications For Inspection of Material - Domestic Shipment Navy Department STANDARDS : I f4i lit a ry : MIL-STD-105, Smpling Procedures and Tables , for Inspection by Attributes MIL-STD-129, Marking of Shipments Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
5、om IHS-,-,-MILS-17806(NOrd) DRAWINGS: Bureau of Ordnance LD No. 266992, Servo Motor Mk 12 Mod O I,D No. 274081, Servo Motor Mk 12 Mod 1 ID No. 275172, Servo Motor Mk 16 Mod 0 LD No. 274080, Servo Motor Mk 16 Mod 1 Drawings and specifications listed on the following Bureau of Ordnance List of Drawing
6、s: Drawings referenced on the Bureau of Ordnance List of Drawings are end product drawings. They supply dimensional data and material specifications but do not include process informtion and detailed instructions for the performance of operations that are considered to be part of the ttknow-howrt of
7、 qualified instrument manufacturers. how“ includes handling techniques which minimize strain in magnetic structure, handling of windings of a precision nature, and the use of potting techniques and processes. Copies of the Lists of Drawings and all drawings, specifications, and standards listed ther
8、eon may be obtained from the Bureau of Ordnance, Navy Department, Washington 25, D. C. Such “know- 3. REQUIREMENTS 3.1 General Requirements: The servo motors shall be in accordance with the requirements of this specification and with the drawings and specifications listed in paragraph 2. 3.2 Process
9、 Requirements: The -manufacturing processes and techniques for the construction of servo motors that are covered by this specification are to be selected by the manufacturer to meet the performance requirements of this specification. 3.3 Ambient Conditions: After exposure to the following ambient co
10、nditions, it shall be demonstrated by tests that the performance of servo motors manufactured under this specification meet the inspection requirements. 3.3.1 Endurance: Prolonged operation at maximum power under rated voltage conditions in ambient temperatures between -6joF and +212OF when tested i
11、n accordance with paragraphs 4.7.2, 4.7.3, and. .4.7;4. .- -2- . : rL Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-17806( Nord) 3.3.2 High Humidity: ,Exposure to high-humidity atmosphere in airborne and chipborne use in accordance with test
12、 described in paragraph 4.7.6. 3.3.3 Shock and Vibration: Shock and vibration as en- countered in airborne and shipborne use in accordance with test described in -paragraph 4.7.5.- 3.4 Results of tests and tolerances - Results of tests performed on servo motors covered by this specification shall be
13、 in accordance with the following table (TABU I). -3- /- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-L706 - - PJEC-17806(NOrd) in rl IA cr c! . v O0 I“ Ion I “I”“ rn do rn .tc; ,u fi Ln s rl c Q) M n o c H I t;O E; *d Yj .- a -. o iN 5- E -
14、4- c. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILS-17006( Nord) 3.4.2 Tachometer Generator - Requirements: Results of . tests performed on tachometer generators shall meet the follow- ing requirement s. . 3.4.2.1 . Motor at Rest - The- total
15、voltage output shall not .exceed .O13 volt HNS -) for any position of rotor. The funda- mental component Af the voltage shall not exceed .O08 volt (MS) 3.4.2.2 Motor Running - (in accordance with Figure 2) - Ratio of resistance X to resistance X+R, when X+R equals 10,000 ohms shall be .O485 + - .O01
16、 for 1800 RPM and .O970 I + .O02 for 3600 FPM. . 3.4.2.3 Output Voltage: Voltage output to be proportional to shaft speed. 3.4.2.4 Phase and Polarity: Phase relation and polarity to be in accordance with paragraphs 4.8.11.6 and 4.8.11.7. 3.5 Interchangeability - In this specification all servo motor
17、s that have the same mark and mod designation shall be mechanically and electrically interchangeabl6. 3.6 Identification - Servo motors shall be identified by nameplate in accordance with applicable drawings of paragraph fi- A.L. 4. SAMPLING, INSPECTION, AND TEST PROCEDURES 4.1 Sampling: 4.1.1 Lot -
18、 The “inspection lot! is a collection of units of product xmitted by a supplier for Government Inspection. The number of units of product in inspection lots shall be determined by the Government Inspector and may differ froin the quantity designated in the contract or order as a lot for production,
19、shipment, or other purpose, determination of acceptability of lots procured by the govern- ment unless otherwise specified, shall conform to the provisions . 4.1.2 A sampling plan and procedure applicable to the Of MIL-STD-105 4.2 Government Inspection - The Government Inspector may, . during the pr
20、ocess of manufacture and assembly, perforin and witness or participate in such inspections and tests as he deems necessary to assure that the component parcs, subassemblies, and assemblies conform with the requirements of applicable contracts, orders, requisitions, drawings, and specifications. I .-
21、 -5- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-17Ob 66 777770b 0127523 2 I I MIL-S-17806( Nord) . , 4.2.1: For naval purchases, the general inspection procedures shall be in accordance with General Specifications for Inspection of Materia
22、l. 4.3 by whatever means or methods are desired and to the extent that is necessary, that components, subassemblies, and complete assemblies offered for Government acceptance or delivery do con- form with the requirements of all applicable .drawings, specifications, requisitions, contracts, and orde
23、rs. Contractorts Inspection - The contractor shall determine, 4.4. Classification of Tests - Tests to determine .whether servo motors have been manufactured in accordance with the . drawings of paragraph 2.1 and .this specification are divided into the tvm following categories: (a) Pre-production Te
24、sts (b) Inspection Tests 4.5 Conditions for Tests - Unless otherwise specified, the tests shall b e conducted at room temperature of approximately .2r0 Centigrade and at an atmospheric pressure of approximately 30 inches of mercury. The power to be used in the tests shall have a frequency of 4.00 +
25、5 cycles. The waveform shall be essentially sinusoidal and shall have a crest factor of 1.41 .+ - 10 percent and a form factor of 1.11 +, 5 percent. on six (6) units selected by the Government from among the first units to be manufactured and shall be performed at the Governmentts expense at a time
26、and place to be designated by the Government. The contractor shall, if requested by the Government, provide a representative at his own expense for Cechnical advice and assistance. The Government reserves the right to erform tests on any or all equipments (prototype and production P at its own expen
27、se, if such tests are needed to insure conformance with requirements of this specification or other applicable specifications. 4.6 Time and Place - Pre-production tests shall be performed 4.7 Pre-production Tests - .Sampling and acceptance criteria shall be in accordance with Yaragraph 4.60 4.7.1 Te
28、mperature Rise - With the motor mounted on a 6 x 6 .x 1/4 inch aluminum plate, having a base of heat insulation material to isolate motor and plate from container, placed in a container the volume of which is 2 to 5 cubic feet, the winding resistance of the reference phase of the generator shall be
29、ineasured at room temperature. The temperature rise after the . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-S-37806 66 = 9999906 0329524 4 mK , _- MIL-S -17806 ( Nord ) generator is stalled and stands for one hour with rated voltage applied t
30、o both phases of the notor and the reference phase of the generator, shall not exceed the value specified in Table I. (This measurement shall be based on winding resistance and the following formula): Temperature Rise = R2 - R1 (234.5+ t) Where: t = Room temperature in degrees Centigrade ill = Resis
31、tance at room temperature R2 = Resistance when hot (both in olyns) R1 4.7.2 bw-Temperature Test - Flotors shall be placed in a chamber in vhich the temDerature-is held at -54O. Centigrade (-65O Fahrenheit). After one hour in this atmosphere, rated voltage shall be applied to Phase 1 for 2 minutes. T
32、hen, with rated voltage on both phases, the motor shall attain tuithin30 seconds a no-load speed of 85 percent of the minimum value specified in Table I. 6 x 6 x l/l+ inch aluminum plate shall first pass the minimum no-load speed test and then be placed in a test chamber that has an atmospheric temp
33、erature of looo Centigrade (212O Fahrenheit) for one hour without excitation. These motors shall then be operated in this atmosphere for one hour with rated voltage on each phase of the motor and or! the reference phase of the generator. percent from the speed attadned in the minimum no-load speed t
34、est . 4.7.3 High-Temperature Test - Motors mounted on a The no-load speed shall not vary more than 10 4.7.4 . High-Tenperature Endurance - With rated voltage on each Dhase.motors shall b e operated 48 hours under load at . maximb output power in an ambient temperature of 100 Centigrade (212“ Fahrenh
35、eit), then be cleaned and relubricated. These motors shall then be capable of passing inspection tests. 4.7.5 Vibration and Shock 4.7.5.1 Vibration - While mounted on a vibration table, the motors. shall operate satisTactorily duririg and after vibration. The equipment shzll be vibrated with a frequ
36、ency varying between 10 and 55 cycles per second at an amplitude I having a total excursion of 0.06 inch, the frequency varying uniforrnly from 10 to 55 cycles per second and returning to 10 Application of the vibration shall be in each of the following directions: . cycles per second in approximate
37、ly one minute. P Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-S-17806 bb 99Ob 0129525 b m MIL-S-17806( Nord) 47.5.1.1 Horizontally, parallel to the ma Sor horizontal axis, for a period of 90 minutes. 4.7.5.1.2 Horiaontally, at right angles to
38、 the major horizontal axis, for a period of 90 minutes. 4.7.5.1.3 Vertically, for a period of 90 minutes. 4.7.5.2 Shock - The mtor shall not suffer damage or subsequently =to provide the performance specified in the specification for individual equipment when it is subjected to 30 impact shocks of 3
39、0 Gfs, each shock impulse having a time duration of 11 + 1 milliseconds. The shock shall be applied with any individual shock isolator or shock insulating mounting assembly removed. The shock shall be applied in the following directions: Horizontally, parallel to the major horizontal axis; five shoc
40、ks in each direction. 4.7.5.2.1 4.7.5.2.2 horizontal axis; five shocks in each direction. Horizontally, at right angles ta the major 4.7.5.2.3 Vertically, five shocks in each direction. 4.7.6 HiRh Humidity - High humidity tests shall be per- formed on two motors: 4.7.6.1 inspection tests listed unde
41、r paragraph 4.8. 4.7.6.2 The units shall be laced in a test chamber having a temperature of 20“ to 31“ Centigrade (68O to 10004“ Fahrenheit) and set up to simulate installed condition. Then during a period of two hours, the temperature in the chamber shall be raised gradually to 71“ Centigrade (160“
42、 Fahrenheit) and maintained for the following six hours. period, the relative humidity in the chamber shall be main- tained at 95 percent. Immediately after the 6 hour period has elapsed, the temperature is to be lowered at a uniform rate over a period of sixteen hours until 20 to 38O Centi- grade (
43、68“ to 1o0.4 Fahrenheit) is reached. The preceding precedure is considered one cycle and a total number of cycles sufficient to extend the elapsed time to 360 hours shall be performed. At the conclusion of the 360 hour procedure, the equipment shall be operated and the data compared to that obtained
44、 in paragraph 4.8. The two motors shall first have passed the During this -8- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-17806 66 7779706 0127526 8 m . ._ -. .- .I,L-S;17806(Nrd) . . . :. . 4.7.6.3 Distilled or demineralized water having a
45、.pH value of between 6.5 and 7.5. at 25O Centigrade (77“ Fahren- heit) shall be used to obtai-n the desired- humidity. After completion of test the rotors,. stat,ors, and drag cup shall be examined for evidence of rust or corrosion. The following shall be considered as cause for re j.ection: externa
46、l surfaces of bearing races. . 4.7.6.4 4.7.6.4.1 Any visible .,rust on ferrous parts except the 4.7.6.4.2 Any corrosion which vrould result in a failure - of the servo motor. . 4.7.6.4.3 Any varnish orJresinous condensates on the bearings. The bearing shields shall be removed for this examination. R
47、ust on the external surfaces of the bearing races shall not be considered cause for rejection. 4.8 Inspection Tests - Under the supervision of the Government Inspector, the following inspection tests shall be performed 6n all-servo motors. furnish acceptance inspection instructions. The procuring ag
48、ency shall 4.8.1 Mounting and Shaft Dimensions - The motors shall meet the dimensional requirements given by the installation drawings listed under paragraph 2 . 1 . 4.8.2 End Pla - The end play of the shaft, measured -during the - reversa of a one-pound axial load, shall be not . less than .O010 an
49、d not more than .0035, as given by the in- stallation .drawhg li st ed under paragraph 2.1. 4.r3.3 Radial Pla - The radial play of the shaft, measured during the reversa a one-pound radial load applied at a point not more than l/B-inch from the bearing, shall be within .0008, as given by the installation drawings listed under paragraph 2 . 1 . 4.8.4 High-Potential and Insul
