JB/T 4376-2002 Technology of small power asynchronous motors for water pumps
Some standard content:
ICS29.160
Machinery Industry Standard of the People's Republic of China
JB/T4376—2002
Replaces JB/T4376—1986
Specifications for water pumps' small power asynchronous motors2002-12-27 Issued
2003-04-01 Implementation
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword
Normative referenced documents
Types, basic parameters and dimensions,
Technical requirements..
Test methods.
Inspection rules..
Marking, packaging, transportation and storage
Appendix A (Informative Appendix) Model naming of small power asynchronous motors for water pumps Figure 1 Schematic diagram of appearance and installation dimensions
Figure 2 Schematic diagram of appearance and installation dimensions
JB/T4376—2002
This standard is a revision of JB/T4376-1986 "Technical conditions for small power asynchronous motors for water pumps". JB/T4376--2002
Compared with JB/T4376-1986, this standard adds five contents, namely, table of contents, foreword, scope, normative references, types, basic parameters and dimensions, and test methods.
This standard replaces JB/T4376-1986.
Appendix A of this standard is an informative appendix.
This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the Small Power Motor Sub-Technical Committee of the National Rotating Electric Machine Standardization Technical Committee. This standard was drafted by Tianjin Second Micromotor Factory. The main drafters of this standard are: Zhou Min, Li Zhentang, Wu Yue, Liu Yuemin, Mu Guirong, Huang Shiguan. This standard was first issued in June 1986.
1 Scope
Technical conditions for low-power asynchronous motors for water pumps JB/T4376---2002
This standard specifies the types, basic parameters and dimensions, technical requirements, test methods and inspection rules, as well as the requirements for marking, packaging, transportation and storage of three-phase and single-phase asynchronous motors for water pumps. This standard applies to three-phase, single-phase resistance-start, single-phase capacitor-start and single-phase capacitor-operated low-power asynchronous motors (hereinafter referred to as motors) coaxial with water pumps.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions are applicable to this standard. GB755-2000 Rating and performance of rotating electrical machines (idtIEC60034-1:1996) GB/T1032-1985 Test methods for three-phase asynchronous motors GB/T2423.4-1993 Basic environmental test procedures for electrical and electronic products Test Db: Alternating damp heat test method (eqvEC60068-2-30:1980)
GB/T4831-1984 Method for compiling motor product models GB/T4942.1--2001 Protection classification of rotating electrical machine housing (IP code) (idtIEC60034-5:1991) GB/T5171--2002 General technical conditions for small power motors (eqvEC60034-1:1996) GB/T9651-1988 Test methods for single-phase asynchronous motors GB10068-2000
60034-14:1996)
Mechanical vibration of motors with a shaft center height of 56mm or more. Measurement, evaluation and limit of vibration (idtIEC GBT10069.1-1988 Noise determination method and limit of rotating electrical machines. Engineering determination method of noise (neqISO·1680-1:1986)JB/T9547-1999 Technical conditions for centrifugal switches for starting single-phase motors 3 Types, basic parameters and dimensions
3.1 The motor housing protection grade is IP44. 3.2 The cooling method of the motor is IC0141. 3.3 The motor structure and installation type are that the base has a foot, the end cover has a small flange, and the shaft is at the flange end. 3.4 The motor rating is a continuous rating based on the continuous duty system (S1). 3.5 The rated frequency of the motor is 50Hz, the three-phase rated voltage is 380V, and the single-phase rated voltage is 2 20V. ·3.6 The synchronous speed of the motor is 3000r/min. 3.7 The motor is manufactured according to the following rated powers: 180, 250, 370, 550, 750, 1100W. 3.8 The corresponding relationship between the motor frame number and power shall be in accordance with the provisions of Table 1. 3.9 Dimensions and tolerances of the motor:
3.9.1 Installation dimensions and external dimensions of the motor: The installation dimensions and tolerances of the three-phase and single-phase resistance starting motors shall comply with the provisions of Figure 1 and Table 2, and the external dimensions shall not be greater than the provisions of Table 2; the installation dimensions and tolerances of the single-phase capacitor starting and single-phase capacitor running motors shall comply with the provisions of Figure 2 and Table 3, and the external dimensions shall not be greater than the provisions of Table 3
JB/T4376—2002
Frame and core code
80125100|15
Single-phase resistance starting
Single-phase Capacitor starting
Schematic diagram of appearance and installation dimensions
Installation dimensions
41.5±0.5
Schematic diagram of appearance and installation dimensions
41.5±0.5
Single-phase capacitor operation
Unit: mm
Dimensions
Not more than
ABACHDL
107M6|1451452 00283
123M8160165220315
Unit: mm
Overall dimensions
Not more than
sABACAEHDL
107M614516795200283
123M8160192110220315
The dimensions of the motor shaft extension key shall comply with the provisions of Table 4. Shaft extension dimensions
Key width (h9)
JB/T4376—2002
Unit: mm
Key height (h9)
The radial runout tolerance of the circumferential surface at the midpoint of the shaft extension joint during shaft rotation shall not be greater than 0.035mm. 3.9.3 Lathe
3.9.4 The radial runout tolerance of the flange stop diameter to the shaft centerline and the end face runout tolerance of the flange support surface to the perpendicular plane of the shaft centerline shall not exceed 0.08mm.
3.9.5 The symmetry tolerance of the keyway on the motor shaft extension is 0.040mm. Technical requirements
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. 4.2 The motor shall be able to operate at rated altitude under the following conditions of altitude, ambient air temperature and ambient relative humidity. 4.2.1
Altitude shall not exceed 1000m.
4.2.2 The maximum ambient air temperature varies with the seasons, but shall not exceed 40℃ Note: If the motor is specified to be used at an altitude exceeding 1000m or the maximum ambient air temperature is higher than 40℃, it shall comply with the provisions of 5.3.4 in GB755-2000.
The minimum temperature of ambient air is 5℃.
4.2.4 The average relative humidity of the wettest month is 90%, and the average minimum temperature of the month is not higher than 25℃. 4.3
The deviation of rated power supply voltage and frequency during motor operation shall comply with the provisions of 4.3 of GB755-2000. 4.4
When the power, voltage and frequency of the motor are rated, the guaranteed values of efficiency and power factor shall comply with the provisions of Table 5 and Table 6 respectively. Table 5
Power W
Three-phase (%)
Note: The efficiency is determined by actual measurement method,
Power W
Resistor start (%)
Resistor start
Capacitor start (%)
Capacitor start
Capacitor operation (%)
Capacitor operation
Under rated voltage, the guaranteed value of the ratio of the motor's stall torque to the rated torque is 2 for three phases.2 times, single phase should comply with the provisions of Table 7 3
JB/T4376-2002
Power W
Resistor start
Capacitor start
Capacitor operation
Under rated voltage, the guaranteed value of the ratio of the minimum torque to the rated torque during the motor starting process shall not be lower than the provisions of Table 8, Table 8
Resistor start
Capacitor start
Capacitor operation
4.7 Under rated voltage, the guaranteed value of the ratio of the maximum torque of the motor to the rated torque is 2.4 times for three-phase and 1.8 times for single-phase 4.8 Under rated voltage, the guaranteed value of the ratio of the stall current to the rated current of the three-phase motor is 6 times. Note: When calculating the ratio of the stall current to the rated current, the rated current value used should be obtained by the guaranteed value (excluding tolerance) of the rated power, rated voltage, efficiency and power factor.
Under rated voltage, the guaranteed value of the locked-rotor current of a single-phase motor shall comply with the provisions of Table 9. Table 9
Power W
Resistance start
The tolerance of the guaranteed value of the motor's electrical performance shall comply with the provisions of Table 10. Table 10
Efficiency n
Power factor
Locked-rotor torque
Locked-rotor current
Maximum torque
Capacitor starting
-0.15 (1-n)
Capacitor operation
(1-cos)16, at least -0.02
Guaranteed value -15%
Guaranteed value +20%
Guaranteed value -10%
The deviation of voltage and frequency during motor operation shall comply with the provisions of GB/T5171-2002 4.10
The motor adopts Class E insulation. When the altitude and ambient air temperature are the same as those specified in 4.2, the temperature rise limit of the motor stator winding (resistance method) shall not exceed 75K, and the allowable temperature of the bearing (thermometer method) shall not exceed 95℃. If the altitude or ambient air temperature of the test site is different from that specified in 4.2, the temperature rise limit shall be handled in accordance with the relevant provisions of GB/T5171-2002.
4.12 The insulation resistance of the motor stator winding in the hot state or after the temperature rise test shall not be less than 1M2. 4.13 The stator winding of the motor shall be able to withstand a withstand voltage test lasting 1min without breakdown. The test voltage frequency is 50Hz, the waveform is an actual sine wave, and the effective value of the voltage is 1760V for three-phase and 1500V for single-phase. When a large number of motors produced continuously on the assembly line are inspected before leaving the factory, the test time is allowed to be shortened to 1S, and the effective value of the test voltage is 2110V for three-phase and 1800V for single-phase. The withstand voltage test should be repeated as little as possible when conducting acceptance tests on motors. If a second test is necessary, the test voltage is reduced to 80% of the specified voltage value.
JB/T4376—2002
4.14 The stator winding of the motor shall be able to withstand the elevated voltage test without breakdown. The test is carried out when the motor is unloaded, with an external voltage of 130% of the rated voltage for 3 minutes. When the voltage is increased to 130% of the rated voltage, the frequency is allowed to be increased at the same time, but it shall not exceed 115% of the rated value (the frequency shall not be increased for single-phase capacitor-operated motors). 4.15 During the motor inspection test, the current and loss of no-load and stalled rotor shall be within a certain numerical range, which shall ensure that the motor performance complies with the provisions of 4.4 to 4.9 of this standard. 4.16 In the case of hot state and gradually increasing torque, the motor shall be able to withstand an over-torque test exceeding its rated torque of 60% for three-phase and 40% for single-phase for 15 seconds without sudden change in speed, stalling or harmful deformation. At this time, the voltage and frequency are maintained at the rated value. 4.17 The motor shall be able to withstand the increase of speed to 120% of its rated value for 2 minutes without any harmful deformation when it is unloaded. 4.18 After the motor winding is tested for 6 days in the 40℃ alternating damp heat test method specified in GB/T2423.41993, the insulation resistance shall not be less than: 0.38M2 for three-phase and 0.22M2 for single-phase, and it shall be able to withstand the 85% test voltage specified in 4.13 of this standard for 1 minute without breakdown.
4.19 The effective value of the vibration velocity measured when the motor is unloaded shall not exceed 1.8mm/s for three-phase and 2.8mm/s for single-phase. The value of the A-weighted sound power level measured when the motor is unloaded shall not exceed 75dB (A). 4.20
The centrifugal switch of the single-phase motor shall comply with the provisions of JBT9547-1999. After installation, the centrifugal switch disconnecting speed of the single-phase motor is 60% to 75% of the synchronous speed. 4.22
4.23 The motor can be equipped with an outlet box, or it can be directly connected with the user by cable. The motor should be equipped with a grounding screw at an appropriate position, and a grounding mark should be set near the grounding screw. This mark is not easy to erase during the service life of the motor. 4.24 The centrifugal switch, auxiliary winding and capacitor of the single-phase motor with direct cable connection are all wired internally, and the wiring should ensure that the motor rotates clockwise when viewed from the shaft extension end.
4.25 The surface paint of the motor should not have spots, wrinkles, bubbles, damage, cracks and adherent dirt. 4.26 If the user uses and stores the motor correctly according to the provisions of the use and maintenance instructions, the manufacturer should ensure that the motor can operate well within one year of use (or no more than two years from the date of shipment from the manufacturer). If the motor is damaged or cannot work normally due to poor manufacturing quality during this period, the manufacturer should repair or replace parts or motors for the user free of charge. 5 Test methods
5.1 The various tests specified in 6.2 and 6.4 of this standard, electrical performance of three-phase motors shall be carried out in accordance with GB/T1032--1985, single-phase motors shall be carried out in accordance with GB/T9651-1988, vibration shall be carried out in accordance with GB10068-2000, noise shall be carried out in accordance with GB/T10069.11988, centrifugal switch disconnection speed shall be carried out in accordance with JB/T9547-1999, and damp heat test shall be carried out in accordance with the methods specified in GB/T2423.4-1993. 5.2 The motor housing protection grade test shall be carried out after the product structure is finalized or when there is a major change in the structure. The test shall be carried out in accordance with the methods specified in GB/T4942.1-2001.
6 Inspection rules
6.1 Each motor shall be inspected and qualified before leaving the factory, and shall be accompanied by a product certificate. 6.2 Each motor shall undergo factory inspection. Factory inspection items include: 6.2.1 Mechanical inspection:
a) Surface quality inspection: The motor surface paint should be dry and complete, without stains, damage, cracks, etc. b) Check whether the motor assembly is complete and correct. For single-phase motors, the relationship between the wiring and the direction of rotation should also be checked. Bearing inspection: The motor should run smoothly, briskly, without stagnation, and the sound should be uniform and harmonious without harmful noise. c)
d) Inspection of installation dimensions and external dimensions. e) Inspection of shaft extension keyway symmetry, shaft extension radial runout, flange stop and bearing surface runout. 6.2.2 Determination of insulation resistance between stator winding and housing (during the inspection test, the cold insulation resistance can be measured, but the hot insulation resistance should be guaranteed to be no less than 1.0M2).
6.2.3 Determination of DC resistance of stator winding in actual cold state. 5
JB/T4376—2002
6.2.4 Stator winding withstand voltage test on housing. 6.2.5 Stator winding voltage increase test. bzxz.net
6.2.6 Determination of no-load current and loss (no-load characteristic curve shall be measured for type inspection). 6.2.7 Determination of locked-rotor current and loss.
6.2.8 Determination of disconnection speed of centrifugal switch of single-phase motor Note: Each product of 6.2.1 a) to c), 6.2.4, 6.2.6, 6.2.7 (single-phase resistance start and capacitor start motors including 6.2.8) in this standard must be inspected. Other items are allowed to be randomly inspected, and the number of random inspections shall not be less than 2% of each batch of products (but not less than 2 units). If the products are found to be unqualified in the random inspection, the number of random inspection products shall be doubled. If they are still unqualified, the batch of motors shall be considered unqualified and shall be returned for repair. 6.3 Type inspection must be carried out in any of the following cases: When the manufacturer conducts the first trial production or small batch production after the finalization of the model. 6.3.1
When the design or process changes are sufficient to cause changes in certain characteristics and parameters. When the inspection test results and the previous type inspection results have an unacceptable deviation. The batch-produced motors shall be regularly sampled and the sampling time shall be at least once a year. 6.3.4
6.4 The type inspection items of the motor include: all items of factory inspection:
determination of stall torque and stall current (measured in cold state); temperature rise test:
efficiency; power factor determination:
short-time over-torque test
f) determination of maximum torque:
g) determination of minimum torque during starting; h) overspeed test;
i) vibration and noise test.
6.5 During the type inspection, the withstand voltage test of the stator winding to the housing should be carried out when the temperature rise of the motor is close to the operating temperature, and should be carried out after the insulation resistance measurement of the stator winding, overspeed test and short-time over-torque test. 6.6 The number of products for type inspection is 2 to 5 sets (depending on the output, generally 2 sets for less than 200 sets). If unqualified products are found among the sampled products, the number of sampled products for this project shall be doubled. 7 Marking, packaging, transportation and storage
7.1 Each motor must have a nameplate firmly attached to a conspicuous position on the body. The nameplate material and the method of engraving the data and marks on the nameplate shall ensure that the writing 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: a) Motor model and name;
b) Manufacturer name:
c) Manufacturer product number;
d) Registered trademark:
e) Rated power;
Rated frequency:
Rated voltage:
h) Rated current;
Rated speed:
Insulation grade:
Shell protection grade:
1) Year and month of manufacture:
m) When using the outlet box lead, the wiring method should be marked. JB/T4376--2002
When the nameplate must be reduced, items c) and d) may not be marked. If the wiring method is permanently marked in other places, m) may not be marked. 7.3 The motor shaft extension flat key, operating and maintenance instructions (at least one copy for a batch of motors of the same model for the same user) and product certificate should be provided to the user together with the motor. 7.4 The motor flat key must be fixed on the shaft extension, and temporary rust prevention and protection measures should be taken on the flat key surface and flange processing surface. 7.5 The packaging of the motor should avoid moisture and damage during transportation. 7.6 The outer wall of the motor packaging box should be clearly marked with the following signs: a) Shipping station and manufacturer name:
Receiving station and receiving unit name:
Motor model and number:
d) Net weight of the motor and gross weight of the packaging box: e) Packaging box size, and mark "handle with care", "moisture-proof" and other words and symbols at appropriate locations outside the box. 7.7 If the product needs to be stored after unpacking and inspection, it should be repackaged according to the provisions of 7.5 and 7.6 of this standard. 7.8 There is no restriction on the means of transportation of the motor, but the motor must be protected from damage, rain and chemical corrosion during transportation. 7.9 The motor should be stored in a warehouse with dry air and no harmful gas. It is strictly forbidden to store corrosive chemicals such as acids and alkalis and products containing the above chemicals, such as batteries, in the same warehouse as the motor. JB/T4376-2002
Appendix A
(Informative Appendix)
Model naming of small power asynchronous motors for water pumps This model naming is composed of four letters and four digits according to the provisions of GB/T4831-1984. The first and second letters are the product code: YS, YU, YC, YY respectively. YS: three-phase asynchronous motor; YU: resistor-start single-phase asynchronous motor; YC: capacitor-start single-phase asynchronous motor; YY: capacitor-run single-phase asynchronous motor. The third and fourth letters are characteristic codes, and WB is used uniformly to represent micro pumps. The four digits are specification codes. The first two digits represent the base number, in millimeters, indicating the center height of the base: the last two digits represent the core length and the number of poles.
Example:
80-1-2
Specification code: indicates that the motor shaft extension center height is 80mm, and the No. 1 core is 2 poles long.
Characteristic code: indicates that it is used for micro pumps.
Product code: indicates three-phase asynchronous motors.
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