JB/T 7125-1993 Technical requirements for small planar brake three-phase asynchronous motors
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Small Plane Braking Three-Phase Asynchronous Motors 1 Subject Content and Scope of Application
JB/T7125-93
This standard specifies the types, basic parameters and dimensions, technical requirements, test methods and inspection rules, and requirements for marking and packaging of small planar braking three-phase asynchronous motors.
This standard applies to small planar braking three-phase asynchronous motors (hereinafter referred to as motors) and their derived series of motors. 2 Reference standards
GB1993
GB12665
GB10068
GB10069
GB1032
JB/Z294
JB/Z346
Basic technical requirements for rotating electrical machines
Motor housing protection classification
Motor cooling method
Motor structure and installation type code
Motor dimensions and tolerances Frame size 36~400, flange number FF 55FF1080 or FT55~FT1080 motorsWet and hot test requirements for motors used under normal environmental conditionsVibration measurement method and limit value of rotating motors
Noise measurement method and limit value of rotating motors
Test method for three-phase asynchronous motors
Packaging, storage and transportation diagrams
Test method for inter-turn insulation of AC low-voltage motors with scattered windingsInter-turn insulation test limit value type, basic parameters and dimensions
3.1 The stator and rotor of the motor are flat disc type. The air gap magnetic field is axial. The three-phase winding is embedded on the side of the stator core end face close to the rotor. When the stator winding is powered on, an axial magnetic pull is generated between the stator and the rotor. The brake disc is installed on the non-axial exhaust side of the rotor core. 3.2 The housing protection level of the motor is IP44 (see GB4942.1). 3.3 The cooling method of the motor is IC0041 (see GB1993). 3.4 The structure and installation type of the motor is IMB5, which is allowed to be reduced to IMB3 (see GB997). 3.5 The rated frequency of the motor is 50Hz. The rated voltage is 380V, Y connection, and the synchronous speed is 1500r/min. When the user needs it, it is allowed to be manufactured according to other rated frequencies and voltages. 3.6 The motor should be manufactured according to the following rated powers: 0.37, 0.55, 0.75, 1.1, 1.5, 2.2, 3kW. 3.7 The ratings of the motor are based on the continuous rating based on S1 and the short-time rating based on S2 (see GB755). The corresponding relationship between the motor power, flange number and working system should be as specified in Table 1. Approved by the Ministry of Machinery Industry on October 8, 1993
Implemented on January 1, 1994
3.8 Dimensions and tolerances of motors
JB/T 7125-93
Flange number
S230 min
S2 30 min
3.8.1 The installation dimensions and tolerances of motors shall comply with the provisions of Table 2; the overall dimensions shall not exceed those specified in Table 2. 86
Flange number
Limit deviation
Limit deviation
Limit deviation
Limit deviation
Note: 1) The limit deviation of GE = D-GGE is (+1) for flange number FF215 and (+\) for the rest. 2) P dimension is the maximum limit value.
3) The position tolerance of S hole is based on the axis of the shaft extension. N
JB/T7125—93
215180
265230
300250
Limit deviation
Limit deviation
JB/T7125—93
2651230
3001250
Limit deviation
Limit deviation
Limit deviation
Position
Limit deviation
116235
130268
142276
JB/T7125—93
The dimensions and tolerances of the motor shaft extension key shall conform to the provisions of Table 3. Table 3
6-8 03
The radial runout tolerance of the motor shaft extension at half of the length shall comply with the provisions of Table 4. Table 4
Shaft extension diameter D
>10~18
>18~30
Round runout tolerance
The radial round runout tolerance of the flange stop to the motor axis and the end round runout tolerance of the flange mating surface to the motor axis shall comply with the provisions of Table 5.
Technical requirements
Flange stop diameter
180, 230
Round runout tolerance
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. The motor shall be able to operate at rated speed under the following altitudes, ambient air temperatures and ambient air relative humidity conditions. 4.2
The altitude shall not exceed 1000m.
The maximum temperature of the ambient air varies with the seasons, but shall not exceed 40℃. 4.2.2
The average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is not higher than 25℃. 4.2.3
The deviation of the power supply voltage and frequency from the rated value during the operation of the motor shall comply with the provisions of GB755. 4.3
When the voltage and frequency are rated, the guaranteed values of its efficiency and power factor shall comply with the provisions of Table 6. The motor is under power,
Note: The efficiency is determined by the measured stray loss analysis method. Efficiency
Power Four Numbers
JB/T7125-93
4.5At rated voltage, the guaranteed values of the motor's stall torque and the ratio of the maximum torque to the rated torque shall comply with the provisions of Table 7. Table
Stalling torque/rated torque
Maximum torque/rated torque
Under rated voltage, the guaranteed value of the minimum torque during the motor starting process shall not be less than 1.2 times the rated torque. 4.6
Under rated voltage, the guaranteed value of the ratio of the motor's stall current to the rated current shall comply with the provisions of Table 8. 4.7
Stalling current/rated current
The static braking torque and moment of inertia of the motor shall comply with the provisions of Table 9. Table 9
Static braking torque
The guaranteed value of the no-load braking time of the motor shall comply with the provisions of Table 10. Moment of inertia
kg·m*
JB/T7125-93
The tolerance of the guaranteed value of the motor's electrical performance shall comply with the provisions of Table 11. Table 11
Electrical performance name
No-load braking time
0.15(1 front)
Power factor cos
Locked-rotor current
Locked-rotor torque
Maximum torque
Minimum torque
(1-cos)/6Minimum is 0.02
Guaranteed value +20%
Guaranteed value -15 head
Guaranteed value -10%
Guaranteed value -15%bzxZ.net
The motor adopts Class B insulation. When the altitude and ambient air temperature meet the requirements of Article 4.2, the temperature rise limit of the motor stator winding is 80K, and the allowable temperature of the bearing (thermometer method) should not exceed 95℃. (Resistance method):
If the altitude or ambient air temperature of the test site is different from that specified in Article 4.2, the temperature rise limit shall be amended according to the provisions of GB755; Note: ④
The temperature rise limit of motors with a power less than 600W can be increased by 5K;?
The temperature rise value of motors in short-time working system (S2) can be increased by 10K.?
The motor shall be able to withstand the maximum torque value specified in Article 4.5 of this standard (taking into account the tolerance of 4.12
) for 15 minutes without sudden change in speed, stoppage and harmful deformation under hot state and gradually increasing torque, and shall not be able to withstand sudden change in speed, stoppage and harmful deformation under hot state and gradually increasing torque ... 4.14
4.15 The stator winding of the motor should be able to withstand a withstand voltage test of 1 minute without breakdown. The test voltage has a rated frequency of 50Hz and is as sinusoidal as possible. The effective value of the voltage is 1760V. When inspecting and testing a large number of motors produced continuously on a conveyor belt, the test time is allowed to be shortened by 1s. The effective value of the test voltage is 2110V. The test voltage is applied with a test rod. The stator winding of the motor should be able to withstand the impulse withstand voltage test without breakdown. The peak value of the test impulse voltage is in accordance with the specification of JB/Z346.16
After the stator winding of the motor is tested for 6 cycles according to the 40℃ alternating damp heat test method specified in GB12665, the insulation resistance 4.17
should not be less than 0.38MM. And it can withstand the voltage test specified in Article 4.15 without breakdown, but the effective value of the voltage is 1500V. 4.18 The effective value of the vibration velocity measured when the motor is no-load should not exceed 1.8mm/s. 4.19 The noise value of the A-weighted sound power level measured when the motor is no-load should not exceed the provisions of Table 12, and the tolerance of the noise value is +3dB(A).
JB/T712593
Sound power level
When the three-phase power supply is balanced, the deviation of any phase of the three-phase no-load current of the motor from the three-phase average value should not be greater than 10% of the three-phase average value.
4.21, During the inspection test, the current and loss of the motor under no-load and stalled conditions should be within a certain range. This numerical range should ensure that the motor can meet the requirements of Articles 4.4 to 4.10 of this standard. 4.22 The motor should be made with six outlets. From the main shaft extension end, the motor terminal box should be placed on the right side of the casing. There should be a grounding screw in the motor terminal box, and a grounding mark should be set near the grounding screw. This mark should ensure that it is not easy to be erased during the entire service period of the motor.
4.23 When the letter sequence of the outlet terminal mark is the same as the voltage phase sequence direction of the three-phase power supply, the motor should rotate clockwise from the main shaft extension end.
4.24 When the motor is running at rated speed, the maximum number of brakes allowed per unit time should be 6 times/min. 4.25
The motor brake disc should have a manual release device and should be flexible and reliable. All fasteners of the motor should have anti-loosening measures. Inspection rules
Each motor must pass the inspection before leaving the factory, and a product certificate should be attached. Each motor should undergo inspection and testing, and the inspection and test items include: a.
Mechanical inspection (according to the provisions of Articles 5.5 and 5.6 of this standard): measurement of the insulation resistance of the stator winding to the housing and between the windings; measurement of the DC resistance of the stator winding in the actual cold state; withstand voltage test;
turn-to-turn insulation test;
Measurement of no-load current and loss;
The no-load characteristic curve needs to be measured during the type test. g
Measurement of locked-rotor current and loss;
The locked-rotor characteristic curve needs to be measured during the type test. h.
Measurement of noise (according to the provisions of Article 5.6 of this standard); Measurement of vibration (according to the provisions of Article 5.6 of this standard). Type tests must be conducted in any of the following situations: a.
When the manufacturer conducts the first trial production or small batch trial production after the finalization of the identification; when the design or process of the motor is changed enough to cause changes in certain characteristics and parameters; when the inspection test results and the previous type test results have an unacceptable deviation: JB/T7125-93
Batch-produced motors are regularly tested, once a year. When the number of tests required is too large, the test interval can be appropriately extended, but at least once every two years. 5.4 The type test items of the motor include: a.
All items of the inspection test;
Temperature rise test;
Efficiency and power factor determination;
Short-time overtorque test;
Maximum torque determination;
Minimum torque determination during starting,
Overspeed test;
Determination of moment of inertia;
Determination of no-load braking time:
Determination of static braking torque.
5.5 The mechanical inspection items of the motor include: a.
Rotation inspection: When the motor rotates, it should be smooth and light without stagnation; Appearance inspection: Check whether the motor is assembled completely and correctly, and the paint on the surface of the motor should be dry, complete, uniform, and free of stains, damage, cracks, etc. b.
Inspection of installation dimensions, external dimensions and key dimensions: Installation dimensions and external dimensions shall comply with the provisions of Article 3.8.1 of this standard; the dimensions of keys.
shall comply with the provisions of Article 3.8.2 of this standard. d. Inspection of radial runout at half of the shaft length, radial runout of flange stop to motor axis and end face runout of flange mating surface to motor axis; runout shall comply with the provisions of Articles 3.8.3 and 3.8.4. e.
Friction.
Inspection of brake disc assembly: The assembly of brake disc shall meet good braking requirements, and at the same time, it shall not contact with the housing when the motor is running. 5.6 Article 5.5 a, b and e of this standard must be inspected for each unit, and Article 5.2 h, i and Article 5.5 c and d may be inspected by random inspection, and the inspection method shall be formulated by the manufacturer.
5.7 The test methods for the tests specified in Article 5.2 (except e, h and i) and Article 5.4 of this standard (except i and j) shall be carried out in accordance with GB1032. Article 5.2 e shall be carried out in accordance with JB/Z294. Article 5.2 h shall be carried out in accordance with GB10069, and Article 5.2 i shall be carried out in accordance with GB10068. Article 5.4 i and j shall be carried out in accordance with the test methods recommended in Appendix A. The installation dimension and tolerance inspection specified in Article 5.5 shall be carried out in accordance with GB4772.1.
5.8 The test of the protection level of the motor housing, the 40℃ alternating damp heat test, can be carried out when the product structure is finalized or when there are major changes in the structure and process. The test method for the protection level of the housing shall be carried out in accordance with GB4942.1. The 40℃ alternating damp heat test shall be carried out in accordance with GB12665. Marking, packaging and warranty period
The nameplate material and the engraving method of the data on the nameplate should ensure that the handwriting is not easily erased during the entire service period of the motor. The nameplate should be fixed on the motor housing, and the items to be marked are as follows: a.
Manufacturer name;
Motor name (small flat brake three-phase asynchronous motor): Motor model
Enclosure protection level;
Rated power;
Rated frequency;
Rated current;
Rated voltage;
Rated speed;
Insulation level;
Noise limit;
Static braking torque:
Duty system;
Manufacturer's production year and month and production number;
Weight:
Standard number.
JB/T7125-93
The six outlet terminals of the stator winding of the motor and the wiring position of the terminal board should all have corresponding marks, and the marks should be ensured to be indelible during the entire service life of the motor. The marks are in accordance with the provisions of Table 13. Table 13
Name of stator winding
Second phase
Third phase
Outlet terminal marking
6.4 Shaft extension flat key of the motor: Operation and maintenance instructions (at least one copy is provided for a batch of motors of the same type for the same user) and product certificates should be provided to users along with each motor. 6.5 The shaft extension flat key of the motor must be tied to the shaft. Anti-rust and protective measures should be taken on the surface of the shaft extension and flat key. Anti-rust and protective measures should be taken on the processed surface of the flange.
The packaging of the motor should be able to prevent moisture and damage due to poor packaging within one year from the date of shipment under normal storage and transportation conditions.
The words and signs on the outer wall of the packing box should be clear and neat. The contents are as follows: a.
The name of the shipping station and the 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 box; The overall dimensions of the box:
The words "handle with care" and "moisture-proof" should be marked in appropriate positions outside the box, and the graphics should comply with the provisions of GB191. 6.8 If the user uses and stores the motor correctly in accordance with the provisions of the operating and maintenance instructions, the manufacturer shall ensure that the motor can operate well within one year of use, but 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 within this specified time, the manufacturer shall repair or replace parts or motors for the user free of charge. 94
A1 Determination of no-load braking time
JB/T7125-93
Appendix A
Determination of no-load braking time and static braking torque (reference)
Connect according to Figure A1. After the motor starts and runs normally, cut off the power supply and record the three voltage signals input to the optical oscilloscope. Resistance
Figure A1 Braking time measurement circuit diagram
The DC tachometer generator is coaxial with the motor to be measured and gives a DC voltage signal. After the power is cut off, the signal begins to decay until it reaches zero, which gives the time when the motor stops rotating. The AC voltage signal at the motor terminal, when the power is cut off, the voltage signal begins to decay, which gives the time when the power is cut off. b.
Power frequency voltage signal, which gives the time scale. C.
On the film taken by the oscilloscope, compare the line segment between the point where the AC voltage begins to decay and the point where the voltage of the tachometer generator is zero with the time scale, and the braking time can be converted. Determination of static braking torque
Value.
Fix a lever at the end of the motor shaft extension according to Figure A2. Apply a force F to the lever at a distance L from the motor axis through a spring balance in a direction perpendicular to the lever, and measure the weight WZ of the lever at a distance L when the motor slip spring brake is released and the lever is horizontal to the ground. The static braking moment M is calculated according to the following formula;
M,=(F-Wz) · L
Wherein: M; static braking moment, N·m;
F—spring scale reading, N;
—the weight of the lever at a distance L under horizontal conditions, N; Wz
lever length, m.
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