JB/T 6738-1993 General technical requirements for single-phase asynchronous motors for closed refrigeration compressors
Some standard content:
Mechanical Industry Standard of the People's Republic of China
General Technical Conditions for Single-phase Asynchronous Motors for Closed Refrigeration CompressorsbzxZ.net
1 Subject Content and Scope of Application
JB/T6738-93
This standard specifies the type, basic parameters and dimensions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage requirements of single-phase asynchronous motors for closed refrigeration compressors (hereinafter referred to as motors). This standard applies to motors with a power of 0.04 to 3.7 kW working in R12, R22 or R502 refrigerants. 2 Reference standards
GB9651
GB4831
Basic technical requirements for rotating electrical machines
Test methods for single-phase asynchronous motors
Packaging, storage and transportation graphic symbols
Compilation methods for motor product models
Test methods for insulation and fluorine resistance of motors for closed refrigeration compressors GB/T13501
JB/Z294
JB/Z346
Test methods for insulation between voltages of AC low-voltage motors with scattered windings Test limits for insulation between distances of AC low-voltage motors with scattered windings 3 Types, basic parameters and dimensions
The compilation of motor models shall comply with the following provisions 3.1
Supplementary code: specified in the product standard. Special environment code, respectively represented by R1, R2.R5, indicates that the refrigerants applicable to the motor are R12, R22 and R502.
Specification code: The number in front is the motor power, expressed in kW. When the power is less than 1kW, the decimal point can be cancelled, for example: 0.04kW can be expressed as 004; the number behind is the number of poles of the motor.
Product code: YUR represents a single-phase resistance start asynchronous motor; YCR represents a single-phase capacitor start asynchronous motor, YYR represents a single-phase capacitor run asynchronous motor, and YLR represents a single-phase dual-value capacitor asynchronous motor. R represents "fluorine-resistant". Example: YUR009-2-R1 represents a single-phase resistance start asynchronous motor with a power of 0.09kW and a 2-pole refrigerant R12. 3.2 The motor rating is a continuous rating based on the continuous duty system (S1). 3.3 The rated frequency of the motor is 50Hz and the rated voltage is 220V. 3.4 The rated power of the motor should be manufactured according to the following levels: 0.04, 0.06, 0.075, 0.09, 0.11, 0.12, 0.15, 0.18, 0.25, 0.37, 0.55, 0.75, 0.95, 1.1, approved by the Ministry of Machinery Industry on August 21, 1993
implemented on October 1, 1993
1.5, 2.2, 2.6, 3.0, 3.7kW.
JB/T 6738-93
The synchronous speed of the motor is 3000 and 1500r/min. 3.5
The outer diameter of the stator core of the motor is selected according to Appendix C. 3.6
The installation dimensions and tolerance requirements of the motor should be specified in the product standard. 3.7
4 Technical requirements
4.1 The motor shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. Any requirements not specified in this standard shall comply with the provisions of GB755. 4.2 When the power supply voltage and frequency change during the operation of the motor, it shall comply with the following provisions. 4.2.1 When the power supply frequency is the rated value and the voltage changes between 85% and 110% of the rated value, the output power of the motor shall still be able to maintain the rated value, but the performance is allowed to be different from the provisions of the product standard, and the temperature limit is allowed to exceed the provisions of Table 4. The value exceeded shall be specified in the product standard of the motor, but when the voltage changes to the above limit and the motor is in continuous operation, the maximum value allowed to exceed the temperature limit specified in Table 4 is 10℃.
4.2.2 When the power supply voltage is the rated value and the frequency changes from the rated value by no more than 1%, the output power of the motor shall still be able to maintain the rated value. When the power supply voltage and rated frequency change at the same time (the changes of the two shall not exceed the provisions of Article 4.2.1 and Article 4.2.2 respectively), if the changes of the two are positive, the sum of the two shall not exceed 11%; or the voltage change is positive, the frequency change is negative, the sum of the absolute values of the two shall not exceed 10%; or the voltage change is negative, the frequency change is positive and negative respectively, the sum of the absolute values of the two shall not exceed 15%, then the output power of the motor shall still be able to maintain the rated value, but the performance is allowed to be different from the provisions of the product standard, and the temperature limit is allowed to be in accordance with Article 4.2.1. The motor shall be able to work normally in the mixed medium of the specified refrigerant and refrigeration oil. 4.3
At rated voltage and rated frequency, the guaranteed value of the ratio of the motor's stall torque to the rated torque, the guaranteed value of the ratio of the maximum torque to the rated torque, and the guaranteed value of the ratio of the minimum torque to the rated torque during the starting process shall comply with the provisions of Table 1. Note: For PTC starting and capacitor running motors, the guaranteed value of the ratio of the locked-rotor torque to the rated torque and the guaranteed value of the ratio of the minimum torque to the rated torque during the starting process are the same as those of the resistance starting motors. The guaranteed value of the ratio of the maximum torque to the rated torque is the same as that of the capacitor running motors. Table 1
Resistance starting capacitor Starting capacitor running dual-value capacitor Resistance starting capacitor Starting capacitor Running dual-value capacitor Resistance starting capacitor Starting capacitor Running dual-value capacitor Power
Same Step speed
Synchronous speed
Step speed
300d150300q150c3000150d30001500300d150d3000150d3000150d300d150d30001500300d1500300q1500300d1500Stalling torque/rated torque
Maximum overrun/rated running torque
Max Short turn/rated torque
JB/T6738-93
Continued Table 1
Resistance starting capacitor starting capacitor running dual-value capacitor resistance starting capacitor starting capacitor running dual-value capacitor resistance starting capacitor starting capacitor running dual-value capacitor synchronous speed
Synchronous speed
Synchronous speed
30o15od30d150300150300q154300q150d3o o01530d15o0300015o0300q1500300015od300q150930o1500Stalling torque/rated torque
1.22.52.5p.32
1.11.22.52.50.3
At rated voltage and rated frequency,
Maximum torque/rated torque
Minimum torque/rated torque
1. 00. 35 0. 41. 01. 0
.320.32
1.00.320.321.0
1.00.320.321
1.00.300.301.
1. 00. 300. 31. 0
1. 01. 00. 300. 301. 01. 0
1.01.00.300.301.0
1. 0/1. 0 0. 3d0. 30 1. 0|1. 0 The guaranteed value of the motor's blocked-rotor current shall comply with the provisions of Table 2. Note: The guaranteed value of the blocked-rotor current of PTC-started and capacitor-run motors is the same as that of resistor-started motors. Table 2
Resistor start
Capacitor start
Locked rotor current
Capacitor operation
Dual value capacitor
Resistor start
JB/T6738—93
Locked rotor current
Capacitor start
The tolerance of the guaranteed value of the electrical performance of the motor shall comply with the provisions of Table 3. Table 3
Locked rotor torque/rated torque
Maximum torque/rated torque
Locked rotor current
Capacitor operation
Dual value capacitor
Guaranteed value-15%
Guaranteed value-10%
Guaranteed value-15%
Guaranteed value+20%
The guaranteed values of the efficiency, power factor and slip rate of the motor shall be specified in the product standard. 4.7
Note: Mechanical loss in type inspection is not included in the loss of the motor. 4.8
The iron core of the motor should be surface treated to improve its corrosion resistance. The motor adopts E, B or F grade insulation. After being assembled with the compressor and under the conditions specified in Article 5.2, the winding 4.9
The temperature of the motor winding shall not exceed the limit specified in Table 4. Table
Insulation grade
Winding temperature limit
After the load or temperature rise test, the hot insulation resistance between the winding and the iron core of the motor shall not be less than 5Ma, and the cold insulation resistance of the motor shall not be less than 50Ma.
The winding of the motor shall be able to withstand the turn-to-turn impulse withstand voltage test without breakdown. The test voltage limit shall be in accordance with the provisions of JB/Z346. The motor winding shall be able to withstand the withstand voltage test for 1min without breakdown. The frequency of the test voltage is 50Hz, and it shall be a sine wave as much as possible. The effective value of the test voltage is 1500V. When conducting factory inspection on a large number of continuously produced motors, it is allowed to replace it with a test with an increased test voltage of 1800V for 1s. The test voltage is applied by test. The motor insulation should have good fluorine resistance. When the insulation structure is tested for fluorine resistance, the test is carried out using the Freon-autoclave-frequent starting method, and its life should not be less than 40X10° times; when the insulation structure is tested for fluorine resistance during normal production, its life should not be less than 18X10° times. 4. 14
When the user requires it, the rotor must be dynamically balanced, and its accuracy should not be less than the G2.5 level specified in Appendix D. Unless the user raises an objection, the motor should be equipped with a temperature protection element that has passed the inspection. The rotation direction of the motor is counterclockwise when viewed from the lead-out terminal. When the user requires a motor that is clockwise when viewed from the lead-out terminal, it should be indicated in the order contract.
The marking of the lead-out wire of the motor stator winding should comply with the following provisions: The color marking of the lead-out wire should ensure that its color does not fade during the entire service life of the motor and comply with the following provisions. 4. 17.1
Main winding - white with red stripes or red. 11
Common terminal - white with black stripes or black, JB/T6738-93
Auxiliary winding - white.
4.17.2If the lead wires are of the same color, there shall be a permanent wiring mark in a conspicuous position near the jack on the lead wire plug, and the mark shall comply with the provisions of Table 5,
Main winding
Auxiliary winding
Common terminal
The slot insulation, electromagnetic wire, varnish, lead wire and other materials used in the motor shall meet the corresponding fluorine resistance requirements. The motor lead wire power plug shall comply with the provisions of Appendix A: The polyester fiber binding rope used for the motor shall comply with the provisions of Appendix B. When the residual content of the stator and rotor of the motor is measured, the measured residual content is calculated based on the weight of the stator and rotor per kilogram. It should not exceed the provisions of Table 6, and there should be no conductive material in the residue. Table 6
Motor stator
Motor rotor
Allowable residual content
4.22 If the user uses and stores the motor correctly according to the provisions of the maintenance manual, the manufacturer should ensure that the motor can operate well within one year of use, but not more than one and a half years from the date of shipment from the manufacturer. If the motor is damaged or cannot work normally due to poor manufacturing quality within this specified time, the manufacturer should repair or replace parts or motors for the user free of charge. 5 Test method
5.1 The motor should be tested according to the methods specified in this standard. If not specified in this standard, it should be tested according to the provisions of GB9651. 5.2 The temperature of the motor winding should be measured at the compressor factory after the motor is assembled into a compressor. Under the specified nominal working conditions and the condition that the motor output power does not exceed the rated power, after the motor compressor runs to thermal stability, the temperature of the winding is measured by the resistance method. For motors with refrigerant cooling, under the condition of maximum pressure difference and ambient temperature of 43°C; for motors without refrigerant cooling, under the condition of maximum shaft power and ambient temperature of 43°C, the measured winding temperature is allowed to exceed the provisions of Table 4. 5.3 The determination of hot insulation resistance should be carried out after the motor is heated to a value close to the specified test value by an oven or short-circuit current method, or it can be carried out immediately after the temperature test. The insulation resistance should be measured with a 500V megameter. 5.4 The impulse withstand voltage test between windings shall be carried out in accordance with JB/Z294. 5.5 For the withstand voltage test of the winding, the voltage is applied between the winding and the iron core. The applied voltage starts from no more than half of the full value of the test voltage, and then increases to the full value evenly or in sections at no more than 5% of the full value. The time from half value to full value should be no less than 10s, and the full value voltage test time should last for 1min.
The voltage range of the test equipment is 05000V, and the capacity is not less than 0.75kVA. The set action current of the equipment is divided into grades according to the power of the motor and shall comply with the provisions of Table 7.
Motor power system
Set action current
0.75 and below
>0.75~3.7
JB/T6738-93
5.6..The type test of the fluorine resistance of the insulation structure shall be carried out in accordance with the provisions of GB/T13501. The motor shall be stopped when the number of frequent starting tests reaches 40×10°. In the autoclave and under the test temperature and pressure conditions, the motor winding shall be subjected to a withstand voltage test. The test voltage value is 750V and the test time is 1min. If no breakdown occurs, it is considered qualified. 5.7 The type test of the fluorine resistance of the insulation structure shall be carried out in accordance with GB/T13501. The motor should be stopped when the number of frequent starts reaches 18×10°. Its withstand voltage test value and qualified conditions are the same as those in Article 5.6. 5.8 The determination of the residual content of the stator and rotor of the motor should be carried out according to the following method. Put the stator and rotor into the cleaning tank of the ultrasonic cleaning machine. The size of the cleaning tank is mm: 300×300×300, the ultrasonic frequency is 25kHz, the output power is 1kW, and the cleaning liquid is Freon 113. The highest part of the stator or rotor should be 20-30mm below the liquid surface. Start the cleaning machine, take out the cleaning liquid after 15 minutes, filter it with a 500-mesh filter, dry the residue, weigh it with a balance with a sensitivity of 1/1000, and measure the weight of the residual impurities.
6 Inspection rules
Each motor must pass the inspection before it can leave the factory, and a product certificate should be attached. 6.1
6.2 The motor shall be subjected to the finalization test of the fluorine resistance performance of the insulation structure. Two test samples shall be used. If both are qualified, the insulation structure shall be recognized as qualified. If it is unqualified, the insulation structure and process shall be improved and retested. In any of the following situations, the finalization test of the insulation structure must be carried out. When a new insulation structure is adopted; when one of the main insulation materials such as electromagnetic wire, slot insulation, and impregnation varnish is changed, 6.3 Each motor shall undergo factory inspection. The test items include: a.
Mechanical inspection (specified in the product standard); determination of the cold insulation resistance between the stator winding and the iron core: withstand voltage test between the stator winding and the iron core; impulse withstand voltage test between the coils;
no-load test;
rotor broken bar inspection.
Type inspection must be carried out in any of the following situations: a.
When the trial production of a new product is completed;
When the changes in the motor design, process or materials are sufficient to cause changes in certain characteristics and parameters; for finalized products, when there is an unacceptable deviation between the factory inspection results and the previous type inspection results, batch-produced motors should be sampled and tested once a year. 6.5 The type inspection items of motors include: a.
All items of factory inspection:
Determination of locked-rotor torque and locked-rotor current;
Determination of no-load characteristic curve;
Determination of load characteristic curve;
Determination of maximum torque;
Determination of minimum torque during starting;
Type test of fluorine resistance of insulation structure;
Determination of stator and rotor residue content.
Determination of hot insulation resistance between stator winding and core, and determination of winding temperature limit.
When conducting type inspection, the withstand voltage test and insulation resistance measurement should be carried out after the load test, when the temperature is close to the working temperature. 6.6
6.7 The type test of insulation fluorine resistance performance is allowed to be carried out with representative specifications among products with the same structure, materials and processes. If the test is qualified, it can be considered that the fluorine resistance performance of other specifications with the same structure, materials and processes is qualified. 13
JB/T6738-93
When conducting type testing, 2 units should be randomly selected from each insulation structure product to be inspected. If both units are qualified, the type test is judged to be qualified. If there are unqualified ones, the factory should inspect and rectify the raw materials and manufacturing processes used, and then re-sample. If they are unqualified again, the insulation structure finalization test should be repeated.
6.8 The number of products for type inspection is 3 units (6.5. Except for g in Article 5), if unqualified products are found in the sampled products, the number of sampled products for this item shall be doubled. If they are still unqualified, the batch of products can only be shipped after the basic defects are eliminated. 6.9 The type inspection, insulation structure fluorine resistance performance finalization and type test of the motor shall be carried out with the stator and rotor under test made into a complete machine with shaft extension and capable of normal operation.
7 Marking, packaging, transportation and storage
7.1 The material of the motor nameplate and the method of engraving the data on the nameplate shall ensure that the handwriting is not easily erased during the entire service life of the motor. 7.2 The items that should be marked on the motor nameplate are as follows; Motor model:
Manufacturer name or manufacturer name code;
Manufacturer's year and month of manufacture and product number.
The packaging of the motor should be clean, sealed, moisture-proof and ensure that it will not be damp or damaged due to poor packaging under normal storage and transportation conditions. 7.3
The words and marks on the outer wall of the packaging box should be clear and neat, and the contents are as follows: a.
The name of the shipping station and manufacturer;
The name of the receiving station and the receiving unit;
The model and production number of the motor;
The net weight of the motor and the gross weight of the packaging box; The overall dimensions of the packaging box: length × width × height; The words "handle with care" and "afraid of moisture" should be marked in appropriate positions outside the box, and the graphics should comply with the provisions of GB191. The motor must be protected from damage, rain and chemical corrosion during transportation. 7.5
The motor should be stored in a warehouse with dry air and harmless gas. 7.6
Scope of application
JB/T6738-93
Appendix A
Technical specification for motor lead-out power plug (supplement)
This specification is applicable to the lead-out power plug housing or power plug with lead-out assembly for motors made of thermosetting plastic powder compression molding and thermoplastic plastic injection molding.
Technical requirements
The performance of this product shall comply with the provisions of Table A1. The inspection items not specified in this specification may be negotiated and formulated by the manufacturer and the user in the product technical conditions or order contract.
Dimensions
Insertion force
Pull-out force
Clamping force
Clamping force
Insulation resistance
Withstand voltage
Heat resistance
165℃6h
Cold resistance
30 c24h
shell to lead
between leads
shell to lead
between leads
insulation resistance
attached voltage
insulation resistance
withstand voltage
weight reduction
for motors up to 0.37kW
as per product technical conditions
technical requirements
for motors above 0.37kW
no cracked keys, burrs, bubbles, dirt, and no fiber layer coming out of the lead wire sheath. <130
2500,1min
2500,1min
2500,1min
2500,1min
No powdering, no brittleness
No powdering, no cracking, no brittleness
3000,1min
3000,1min
3000,1min
3000,lmin
Fluorine resistance (Freon
-commercial autoclave 140℃
168 h)
A3 Test method
A3.1 Appearance inspection
Insulation resistance
Withstand voltage
Refrigerator oil
Inspect by visual method.
JB/T6738-93
Continued Table A1
For motors up to 0.37kW
2500,1min
Technical requirements
Not softened, sticky, or brittle, and the lead wire does not fade significantly. No sediment, and the pH test paper is not acidic.
For motors above 0.37kW
3000.1min
A3.2 Insertion force test
Align the three holes of the plug with the three pins of the matching socket and place it on the socket in parallel. Measure the pressing force on the press or use a fixed weight to add to the socket for quantitative measurement.
A3.3 Pull-out force test
After the plug is plugged in and out of the sealed terminal block five times, use a tensile machine, spring scale or basic weight to measure the pull-out force of the single hole or three holes. A3.4 Clamping force test
On the clamps at both ends of the tensile machine at a distance of 100mm, clamp the elastic clip and the lead wire respectively, stretch them at a speed of 250mm/min, and measure the bonding force between the lead wire and the elastic clip. A3.5 Clamping force test
Use a spring balance or a tensile machine to measure the clamping force between the elastic clip of a single lead wire and the socket shell. A3.6 Insulation resistance measurement
Take the plug assembly, place the back of the plug (not the surface that connects to the socket) flat on the electrode, press 50 insulated rods weighing about 0.5kg on the front of the plug, and use a 500V megohmmeter to measure the insulation resistance value between the three leads of the plug to the shell (i.e. the lower electrode) and between each row of wires. A3.7 Withstand voltage test
Take the plug assembly, place the back of the plug flat on the flat electrode, press 50 weight 0.5kg of insulating rod material on the front of the plug, and use a high-voltage test bench with a transformer capacity of not less than 0.5kVA, a set operating current of 10mA, and a voltage range of 0~5000V to perform a withstand voltage test on the three leads of the plug to the shell and between the leads. A3.8 Temperature rise test
Pass 10A current for 1h according to the circuit shown in the figure, and the temperature rise in the center of the three jacks of the plug should not exceed 35℃. There are three test samples in total. Plug assembly
Heat resistance test
JB/T673893
Put the plug assembly in a constant temperature box at 165±2C for 6h, take it out, measure the insulation resistance value of the shell to the leads and between the leads at room temperature, and perform a withstand voltage test and appearance inspection. A3.10 Cold resistance test
Place the plug assembly in a 30℃ low temperature box for 24 hours, take it out, place it at room temperature for 10 minutes, measure the insulation resistance of the shell to the lead and between the leads, and perform a withstand voltage test and appearance inspection. A3.11 Weight reduction test
Take 12 plug shells, place them under the following different conditions in turn, measure their weight reduction, and calculate the average value as the weight reduction value of each plug shell.
Heat in a constant temperature box at 120±1℃ for 6 hours to dehydrate; 8.
b. Heat in a vacuum drying oven at 150±1℃ under a vacuum degree of 1×10°Pa for 6 hours. After each heating, immediately place it in a desiccator filled with silica gel and cool it for 1 hour. Measure the weight values of the same batch of samples after a, b, and different heating treatments, and divide the difference by the number of samples to obtain the weight reduction value. A3.12 Fluorine resistance test
Heat the plug assembly in an oven at 130±2℃ for 1h, take it out, and cool it naturally before conducting a Freon autoclave test according to GB/T13501. The test conditions are shown in Table A2.
Test medium
R22+refrigeration oil
Test temperature
Test pressure
Test time
When the Freon autoclave test is finished, open the high-pressure stop valve to drain the Freon. When the pressure inside the autoclave drops to normal pressure, open the autoclave cover and take out the sample for insulation resistance, withstand voltage test and appearance inspection. c.
The refrigeration oil after the test should be free of precipitation, and the pH test paper should not show acidity. Appendix B
Technical Specifications for Polyester Fiber Binding Ropes for Motors (Supplement)
B1 Scope of Application
This specification applies to polyester fiber braided binding ropes for motors. The product must be woven from 100% polyethylene terephthalate fiber. B2 Technical Requirements
The appearance and performance indicators of the product shall comply with the provisions of Table B1. Inspection items not specified in this specification may be negotiated and formulated by the manufacturer and the user in the product technical conditions or order contract. 17
Nominal diameter
Tensile strength
Drying shrinkage
(120c)
Heat resistance
(1801h)
Methanol extraction rate
Fluorine resistance (Fluorine
High pressure test
140℃168h)
Test method
B3.1 Appearance
Tensile strength
Use visual method.
B3.2 Tensile test
JB/T6738-93
Standard requirements
Soft to the touch, no scratches, burrs, loose wires, knots, discoloration and other defects. ≥>110
≥175
No brittleness, no stickiness, no deformation,
≥195
No melting, no deformation.
≥215
≥235
Under room temperature conditions, clamp the sample on the chuck of the tensile machine at a distance of 500mm, and perform tensile measurement at a speed of 500mm/min to measure the tensile force when the sample breaks. The test values of the 5 samples should all meet the standard requirements. B3.3 Drying shrinkage test
Take 5 samples of 500mm length, place the samples in a constant temperature box at 120±1℃ for 30min, take them out and cool them naturally at room temperature, measure their length L, and calculate the shrinkage according to formula B1. 500-L
Shrinkage -
B3.4 Heat resistance test
Put the samples in a constant temperature box at 180±5℃ for 1h, observe that the samples shall not have melting, deformation, or adhesion. B3.5 Methanol lifting test
Take 10g of the sample and put it in a methanol solution to shake and clean for 1min to remove dust and dirt on the sample. a.
Put the cleaned sample in a 120℃ oven and dry it for 0.5h, then immediately put it in a dryer and leave it for 30min, and then accurately weigh the sample with a balance with a sensitivity of one thousandth. Pour 100 ml of analytical grade methanol into the flask of the fat extractor, and place the weighed sample into the upper reflux cylinder c.
of the fat extractor. The top of the sample should be at least 10 mm below the siphon level. The sample is extracted in the methanol solution for 4 hours, and the reflux frequency is 4 to 6 times/h. d.
Pour the methanol solution containing the extract into a clean, pre-dried and weighed beaker, and then rinse the extractor flask and the reflux cylinder containing the sample twice with clean methanol solution. The amount of liquid used each time is about 10 ml, and the rinse liquid is also poured directly into the beaker. f. When the methanol solution containing the extract is heated and evaporated to 34 ml remaining, place the beaker in a 105°C oven and dry it for 2 hours. After taking it out, place it in a dryer for 0.5 hours, and then weigh it on a balance with a sensitivity of one thousandth and calculate the extraction rate 18 according to formula B2.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.