1、MIL-M-L7556 hL 9799706 OO872LI3 9 fi-4 6-7 MIL-M- 17556(SWS) 30 April 1953 Used IN LIEU OF MIL-M-25ll(in part) 23 October 1950- MILITARY SPECIFICATION MOTOR, DIRECT-CURRENT, FRACTIONAL HP (SHIPBOARD USE) 1. SCOPE 1.1 sop. - This specification covers fractional horsepower, corrosin res-Lnt, direct cu
2、rrer motors forxpboard use. 1.2 Classification, - Motors covered by this specification shall be of the following services (see 6.2). Service A. Service C. 2. APPLICABLE SPECIFICATIONS, STANDARDS, DRAWING, AND PUBLICATIONS 2.1 The following specifications, standards, and drawings, of the issue in eff
3、ect on date of invitation for bids, form a part of this specification: SPECIFICATIONS _ FEDERAL “-1-538 - Insulation, Electrical, Pasted-Mica. NN-B-591 - Boxes, Fiberboard, Wood-Cleated (for Domestic Shipment). NN-!3-601 - Boxes, Wood-Cleated-Plywood, for Domestic Shipment. NN-B-621 - Boxes, Wood, N
4、ailed and Lock-Corner. NN-B-631 - Boxes, Wood, Wirebound (for Domestic Shipment). QQ-M- 161 - Metal.s, Aptifriction, Casting and Ingots. QQ- A-BO1 - Aluminum- Base- Alloys:. Sand Castings. QQ-1-666 - Iron, Malleable; Castings. LLL-3-631 - Boxes; Fiber Corrugated (for Domestic Shipment) LLL-B-636 - B
5、oxes; Fiber, Solid, (for Domestic Shipment). MIL-P-14 - Plastic-Materials, Molded and Plastic Parts, Molded; nermocetting. MIL-P-79 - Plastic-Materials, Laminated, Thermosetting Rods atid Tubes. JAN-P-103 - Packaging and Packing for Overseas Shipment - Boxes, Wood-Cleated, JAN-P-105 - Packaging and
6、Packing for Overseas Shipment - Boxes, Wood, Cleated, JAN+P-106 - Packaging and Packing for Overseas Shipment - Boxes, Wood, Nailed. MIL-B-107 - Boxes, Wood, Wirebound (Overseas Type). JAN-P- 108 - Packaging and Packing for Overseas Shipment - Boxes, Fiberboard MIL-P-116 - Preservation; Methods of.
7、JAN-P-132 - Packaging and Packing for Overseas Shipment - Crates; Unsheathed, JAN-P-139 - Packaging hnd Packing-for Overseas Shipment - Plywood, Container Grade. MIL-B-233 - Boxes, Repair Parts. JAN-E-251 - Electrical-Equipment: Rotation, Connections, and Terminal Markngs for. JAN-8-583 - Wire, Magn
8、et. ._ MILITARY 1 Solid- Fiberboard. Plywood. . (V-Board and W-Board), Exterior and Interior. Wood; Nailed (for Maximum Net, Load of 2,500 Poucds). - -_- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-hlI1,ITARY (contd. ) hlIL-t-G31 - Insulation, El
9、ectrical, Synthetic-Resin Composition, honrigid. JAN-P-690 - Puller: Bushing, Bearing, and Gear Installing and Removing. MIL-1-695 - Insulation, Electrical, Paper (Slot-Cell). MIL-W-BOG - Wire, Ai,IiatuPe-aiiding, Stccl, Tinned. MIL-B-892 - Bronze, Pliosplior, Rolled or Drawn; Bars, Plates, Rods, Sh
10、eets, and Strips. MIL-N-894 - Nickel-Copper-Alloy; Wrought. MIL-S-901 - Slioch?roof-qiiiInient, Class HI (High-Impact) : Shipboard Application MIL-E-917 - Equipment, Electric Power Basic Requirements for (Nad Shipboard Use). MIL-A-958 - Aluminum Base-Alloy, Permanent-Mold Castings (Marine Service).
11、MIL-D-9G3 - Drawings: Production (for Electrical and Mechanical Equipment for Naval Tests for. Siiipb MIL-R-10137 - Repair Parts for Electrical and Mechanical Equipment (Naval Shipboard Use). Overseas Preservation. MIL-A-15153 - Aluminum-Base-Alloy: Die-Castings, MIL-P-15424 - Packaging of Hand Tool
12、s; General Specification for Domestic and MIL-6-18719 - Grease, High-Temperature, Electric Motor, Ball Bearing. MIL-IV-16072 - Wire, Magnet, High-Temperature. MIL-B-162G1 - Bronze, Bearing, Castings. MIL-P-1G298 - Preservation, Packaging, Packing, and Markhg of Electric Machines MIL-0-16486 - Ohmmet
13、er, Insulation-Resistance-Indicating. MIL-1-16910 - Intorference Measurement, Radio, Methods and Limits; 13 Kilocycles to MIL-A-17129 - Aluminum Alloy Casting: Sand, Resistant to Salt Water. MIL-1-17166 - Iron Castings; NoduIar Graphite (Ductile Iron) (for Shipboard Applications). MIL-I?-17292 - For
14、mat for List of Repair (Spare) Parts for Shipboard Mechanical and Having Rotating Parts (Includes Associated Repair Parts). 1000 Megacycles. Electrical Equipment, NAVY DEPARTMENT General Specifications for Inspection of Material. 42B6 - Bearings, Ball. 42B10 - Bearings, Roller. STANDARDS MILITARY MI
15、L-STD-129 - Marking of Shipments. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- I MIL-1-27556 bL 9794906 0087245 - DRAWINGS BUREAUOFSHiPS 9000-S6301-73441 - Standards for Pump Motors. 9000-S6301-73459 - Standards for General Purpose Motors. (Copie
16、s of speriications, standards, and drawings required by contractors in connection with specific procurement functions should be obtained from the procuring agency or as directed by the con- tracting officer. ) bids, unless otherwise stated, form a part of this specification: 2.2 Other publications.
17、- The following publications, of the issue in effect on date of invitation for CONSOLIDATED FREIGHT CLASSIFICATION COMMITTEE Consolidated Freight Classification - Ratings, Rules and Regulations. (Application for copies should be addressed to the Consolidated Freight Classification Committee, 202 Chi
18、cago Union Station, Chicago 6, 111. ) AMERICAN TRUCKING ASSOCIATION, INC. (Application for copies should be addressed to the issuing fficer, American Trucking Association, Motor Freight Classification Rules. Inc. 1424 16th St. N. W., Washington 6, D. C.) AMERICAN STANDARDS 224.7 - Apparatus Noise Me
19、asurement (Application for copies.should be addressed to American Standards Association, 70 East 45th Street, New York 17, New York). 3. REQUIREMENTS 3.1 Definitions. - The following definitions shall apply to the various technical terms wherever such 3.1.1 Continuow duty. - Continuous duty motors s
20、hall be rated at the load in horsepower that can be- terms appear in this specification. carried continuously at the ambient temperature specified (see 3.2.6. l) without exceeding allowable- temperature risec-(see table V). 3.1.2 Speed regulation. - Speed regulation is the change in speed, expressed
21、 as percent of speed at ragd load, when the load is reduced gradually from the rated value to zero with constant applied.voltage and field rheostat setting. 3.1.3 Constant-speed motor. - A constant-speed motor is one of which the normal speed of operation is constant or practically constant; for exa
22、mple, a shunt motor. 3.1.4 Multispeed motor.- A multispeed motor is one which can be operated at any one oftwo or more definite speeds, each being practically indepndent of the load. 3.1.5 Adjustable-speed motor. - An adjustable-speed motor is one the speed of which can be varied gradually over a co
23、widerable range, but when once adjusted remains practically unaffected by the load. 3.1.6 Base speed of adjustable-speed motor. - The base speed of an adjustable-speed motor is the lowest speed obtained at rated load and rated voltage at the temperature rise specified in the rating. degree wit + c a
24、nge inload, ordinarily decreasing whenthe load increases, such as a series motor. 3.1.7 Varyin speed motor. - A varying-speed motor is one the speed of which varies in considerable 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M- 17556(SHJPS)
25、 3.1.8 Adjustable varying-speed motor. - An adjustable varying-speed motor is one the speed of which can be adjusted gradually, but when once adjusted for a given load, will vary in considerable degree with change in load. 3.1.9 Front (of motor), - The front of a motor is the end opposite the coupli
26、ng, 3.1.10 Back (of motor). - The back of a motor is the end which carries the coupling or driving pulley. 3.1.11 Shunt-wound motor. - A shunt-wound motor is one in which the excitation is derived from a voltage source practically independent of the variation load current. The field is usually conne
27、cted in parallel with the armature circuit. if a light series winding is added to prevent a rise in speed with increase of load, the motor is termed stabilized shunt-wound. 3.1.12 Series-wound mctor. - A series-wound motor is one in which the field circuit and armature circuit are connected in serie
28、s. 3.1.13 Compound-wound motor. - A compound-wound motor is one which has two separate fleld windings; one, usually the Fredominating field, connected in parallel with the armature circuit, and the other connected in series with the armature circuit. 3.1.14 Efficiency. - The efficiency of a motor is
29、 the ratio of the useful power output to the total power input. 3,l. 15 Direct measured efficiency. - The output is determined by direct measurement of torque and speed. 3,l. 18 Conventional efficiency. - The ourut is determined by subtraction of the component losses fror1 the input. 3.1.17 Thermal
30、protector (inherent overheating protective device). - A thermal protector is a . protective device which is responsive to motor current and temperature whose pugpose, when applied to I a motor, is to protect the rxolor against excessive overheating due to overload or failure to start. 3,l. 18 Fracti
31、onal horseFower-motor. - A fractional horsepower motor is one built in a frame of any size smaller than 203 as shcm on Drawings 9000-S6301-73441 or 900O-S6301-73459, 3,2 General design, - 3,2.1 Ambient temperatures. - Motors shall be designed for the following ambient temperatures as specified see .
32、2): 40C. 5OoC 65C. Special. 3.2.2 Audible noise, - Motors shall operate without objectionable audible noise at all loads and 3.2.3 Voltage, - Motors shall be designed for the following voltages as specified (see 6.2): speeds within the service range. 115 230 Special 3.2.4 Vdtage limitation. - Except
33、 for submarine service (see 3.7.1) motors shall operate suc- cessfully at rated load with voltage not more than 10 percent above or below rated voltage, but not necessarily in accordance with the standards of performance established for operation at rated voltage, 4 Provided by IHSNot for ResaleNo r
34、eproduction or networking permitted without license from IHS-,-,-MIL- M- 17556(SHIpB) 3.2.5 Winding and speed. - The rated speed In r. pt m. or rated speed range in r. p. m. shall be specified (see 6.2). Except for submarine service (see 3.7.2), the winding and speed classiication of .motors shall b
35、e one of the following, as specified (see 6.2): Shunt (or stabilized shunt) constant-speed. Shunt (or stabilized shunt) adjustable. Shunt (or stabilized shunt) multispeed. Compound, varying speed. Compound, varying multispeed. Series, varying speed. Series, adjustable varying-speed. Series, varying
36、multispeed. Stabilized shunt need not be specified in the contract or order, since the method of obtaining stability is at the option of the manufacturer. specified ( that is, it shall decrease to at least a slight extent with inciease of load, Motors having a full-load or overload speed greater tha
37、n the no-load speed, at corresponding temperatures, will not be accepted. normal operating temperatures shall not exceed ,the following: 3.2.11.2 Constant speed. - The speed regulation of constant speed, continuous-duty motors at Compound - 11N and smaller 25 15N 20 17N 15 18N 12 35 30 25 20 3.2.11.
38、3 Adjustable speed. - The speed regulation of adjustable speed motors at normal operating temperatures shall not exceed 18 percent. 3.2.11.4 The speed regulation of vazying-speed motors shall not exceed the amount specified (see 6.2). 3.2.11.5 Where the safe satisfactory operation of the driven auxi
39、liary requires a speed regulation which is closer than the values specified in 3.2. 11.2, 3.2.11.3, and 3.2.11.4, :he needs of the driven auxiliary shall determine the permissible. speed regulations in the particular case. load hot, based-.on rated load speed hot shall not exceed the following perce
40、ntages: 3.2.11.8 Change in speed due to heating. - The change in motor speed from rated load cold to rated Class A insulation Open: 10 percent Others: 15 percent Class B and class H insulation All enclosures - 15 percent 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without
41、license from IHS-,-,-3.2.12 hsulation resistance. - The insulation resistance, when corrected to 25C. , shall be not lem than th? following: Armature circuit (class A insulated) - 12 megohms. Armature circuit (class B insulated) - 25 megohms. Field circuit (class A insulated) - 25 megohms. Field cir
42、cuit (class B insulated) - 50 megohms. 3.2.13 Dielectric strength. - Motors shaU withstand dielectric test voltages of not less- than 80 cycles per second as follows: Motors 1/2 hp. md less, rated All others: 250 volts and less 900 1 minute Quantities of 100 or less 1 minute Quantities greater than
43、100, for motors rated 250 volts or less 1200 plus 2.4 rated voltage 1 second 1000 plus twice rated voltage 3.2.14 Mechanical balance. - Motors shall be balanced at any load and speed in the operating range. Windings not in mechanical symmetry shall have dummy coils. in general, the proper mechanicd
44、balance shall be effected by the use of balance weights attached by non-corrodible bolts securely locked, drilling out of material, securely welded steel weights, or by babbitt carried in a receiver in such a manner as to preclude its breaking loose. Balancing by the use of solder on the banding wir
45、e is permis- sible subject to De following limitations: (1) Peripheral speed not to exceed 6,500 feet per minute at rated load. (2) All armature cores to be balanced before the windings are inserted. (3) Only tinned banding wire is to be used. (4) The solder not to cover an arc of more than 25 perce
46、nt of the circumference of ihe armature measured on the banding wire unless satisfactory to the bureau or agency concerned. Where the manufacturer pre-balances the armature and takes care in placing the windings in the slots to reduce unbalance due to axial misalignment of the coils, this value may
47、be increased to 33 percent if satisfactory to the bureau or agency concerned. extend past the center of the air gap. (5) Thickness of solder over banding wire not to exceed 3/32 inch,. and in no case to When tested as specified in 4.1.4.6.1, the maximum allowable amplitude in inches of motors rated
48、5000 r.p. m. and lessshall be as shown in table 1. Unless otherwise specified in the contract or order, the degree of balance shall be “standard” in accordance with table I. Motors rated more than 5000 r. p. m. shall be as approved by the bureau or agency concerned. Table I - Maximum allowable ampli
49、tude. - : Maximum allowable total amplitude : * Super- : : Standard : Precision : precision : : balance : balance i balance : Inch inch Inch : 0.001 : o.oO05 : o.Ooo2 : 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-hilL-M-l7550(S“S) 3.2.15 Field coils. - Field coils shall be thoroughly insulated from adjacent, coducttng and grounded parts and shdl be se secured that they cannot become
