JB/T 7128-1993 Technical requirements for asynchronous motors for YTM, YHP and YMPS series coal mills
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Three-Phase Asynchronous Motors for YTM, YHP, and YMPS Series Coal Mills
1 Subject Content and Scope of Application
JB/T712893
This standard specifies the type, basic parameters, operating conditions, technical requirements, installation, inspection rules, and marking and packaging requirements for three-phase cage asynchronous motors for medium and low speed coal mills. This standard applies to three-phase cage asynchronous motors (hereinafter referred to as motors) for low speed (simple type) and medium speed (bowl type) coal mills in power stations, and can also be used to drive other mechanical matching motors with similar characteristics. Reference standards
GB1993
GB1095
GB1096
GB10069
GB10068
GB1032
JB/Z293
Basic technical requirements for rotating electrical machines
Motor housing protection classification
Motor cooling method
Motor structure and installation type code
Motor dimensions and tolerances Motors with frame sizes 355~1000 Rotating electrical machines drawing Cylindrical shaft extension
Flat keyCross-section dimensions of key and keyway
Type dimensions of common flat keys
Rotating electrical machine noise Determination method and limit
Determination method and limit of vibration of rotating electrical machine
Test method of three-phase asynchronous motor
Test specification for interturn insulation of stator winding of AC high-voltage motor Packaging, storage and transportation diagram and symbol
3 Type, basic parameters and dimensions
3.1 Description of model
口-口
Specification code:
Product code
Product code: YTM: indicates cage-type asynchronous motor for simple coal mill YHP: indicates cage-type asynchronous motor for bowl-type HP coal mill YMPS: indicates cage-type asynchronous motor for bowl-type MPS coal mill Specification code: Indicated by center height (mm)-number of poles. For example: YTM500-6YHP560-8
3.2 The protection level of the motor housing is designed and manufactured according to the requirements of IP54 (see GB4942.1). If the protection level is higher than IP54, the user should consult with the manufacturer of JB/T7128-93 approved by the Ministry of Machinery Industry on October 8, 1993 and implemented on January 1, 1994.
3.3-The cooling method of the motor is IC0151 or IC0161 or ICW37A81 (see GB-1993). 3.4 The structure and installation type of the motor is IMB3 (see GB997). 3.5 Rating
3.5.1 Working system: continuous working system (S1). 3.5.2 Rated frequency: 50Hz.
3.5.3 Rated voltage: 6000V or 3000V.3.5.4 Service factor: 1.0. (When the service factor is 1.15, the user should negotiate with the manufacturer)3.5.5 Rated power level:
160, 185, 200, 220, 250, 280, 315, 355, 400, 450, 500, 560630, 710, 800, 900, 1000, 1120, 1250, 1400, 1600, 1800kW.
3.5.6 Synchronous speed
1000, 750, 600z/min.
3.5.7 Dimensions
3.5.7.1 Center height
355, 400, 450, 500, 560, 630, 710, 800mm. 3.5.7.2 Dimensions, tolerances and installation of motors The installation dimensions and overall dimensions of motors with IC0161 and ICW37A81 cooling methods shall comply with the requirements of Table 1. 5
4006~10
Overall dimensions (limits)
(2150)
(2350)
(2500)
(2000)
(2200)
(2400)
Installation scale
±2.10560
JB/T7128-93
Continued Table 1
The dimensions in brackets are the overall dimensions (limits) of the motor with ICW37A81 cooling mode. When sliding bearings are used, the limit deviation of the C dimension does not include the axial dynamic amount. 4 Operating conditions
4.1 The motor should be able to operate at its rated value under the following operating conditions. K
Overall dimensions (limit)
(2500)
(2550)
(2850)
(2700)
(2900)
(3100)
4.1.1 The maximum ambient temperature of the air-cooled motor is 40℃, and the minimum ambient temperature is -15℃. The minimum ambient temperature for the motor with sliding bearings is 5℃.
4.1.2 The maximum water temperature at the cooler inlet of the air-water-cooled motor is 30℃, and the minimum ambient temperature is 5℃. 4.1.3 The altitude shall not exceed 1000m.
Note: If the altitude and ambient air temperature of the motor operation site are different from the above-mentioned conditions, the user shall consult with the manufacturer. 5 Technical requirements
The motor adopts F-class insulation structure, and the temperature rise is assessed according to Class B. The temperature rise limit of the motor stator winding (resistance method) should not exceed 80K when the use factor is 5.1
1.0. The allowable temperature of the bearing (thermometer method) should not exceed 95C for rolling bearings and 80℃ for sliding bearings (oil outlet temperature is not higher than 65℃). When the use factor is greater than -1.0, the temperature rise limit or temperature shall be negotiated between the user and the manufacturer. For motors using air-water coolers, the temperature rise shall be calculated from the temperature of the primary medium at the outlet of the cooler, or from the actual maximum primary cooling medium temperature, and corrected according to the provisions of GB755.
5.2 The insulation resistance of the motor stator winding in the hot state shall not be lower than the value obtained by the following formula. R
Where: R insulation resistance.MO;
U—rated voltage V;
P---rated power kW;
1000+P/100
5.3 The stator winding of the motor should be able to withstand a 1-minute withstand voltage test without breakdown, and the frequency of the test voltage is 50Hz. The voltage waveform should be a sine waveform as much as possible, and the effective value of the voltage is twice the rated voltage plus 1000V. The same motor should not be tested repeatedly. If the user requests, it is allowed to conduct another test on the construction site before starting operation after installation, and the test should be in accordance with the provisions of GB755. 5.4 The stator winding of the motor should be able to withstand the inter-turn impact withstand voltage test or the short-term increase in voltage test without breakdown. When conducting the inter-turn impact withstand voltage test, the test impulse voltage peak value and test method shall be carried out in accordance with the provisions of JB/乙293. When conducting a short-time voltage increase test, the test is carried out under no-load conditions, the external voltage is 130% of the rated voltage, the time is 3 minutes, when the voltage value is increased to 130% of the rated voltage, the power or speed is allowed to be increased at the same time, but it should not exceed 115% of the rated value. 128
JB/T7128-93
5.5 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 average value of the three phases should not exceed .10% of the average value.
The effective value of the perturbation velocity measured when the motor is no-load should not exceed 2.8mm/s. 5.6
The A-weighted sound power level noise value measured when the motor is no-load should not exceed the provisions of Table 2. 5.7
160~220
250~500
560~1100
1250~1800
IC0161
IC0151
ICW37A81
IC0161
IC0151
ICW37A81
IC0161
IC0151
ICW37A81
When rated voltage and power are applied, the The guaranteed values of the ratio of the motor's stall torque, minimum torque and maximum torque to the rated torque shall comply with the values specified in 5.8
Combined with the values specified in Table 3,
慧楚赞缇
蒙生赞
慧态精提
When the rated voltage and frequency are applied, the guaranteed value of the motor's stall current to the rated current shall comply with the provisions of Table 4: Table 4
Stalling current/rated current
The motor shall be tested in accordance with GB1032, and the tolerance of the guaranteed value of the electrical performance shall comply with the provisions of Table 5. The efficiency and power of the motor shall be 5.10
The guaranteed value of the factor is negotiated between the manufacturer and the user. Sequence
Efficiency (kV)
Power factor (cos)
Stalling torque
Minimum torque
Maximum torque
Stalling current
—0.10(1)
-(1-co8Φ)/6Minimum-0.02
Guaranteed value-15%
Guaranteed value-15%
Guaranteed value-10%
Guaranteed value+20%
The motor should be able to withstand 1.6 times the rated torque for 15s without sudden change in speed, stalling and harmful deformation when in hot state and with gradually increasing torque. At this time, the voltage and power should be maintained at the rated value. If limited to the equipment, it is allowed to measure the stator current instead of the torque during the test. At this time, the stator current should be equal to 1.1 times the overtorque multiple multiplied by the rated current value. 5.12 The overspeed test of the motor is carried out under no-load conditions. It should be able to withstand an increase in speed to 120% of its rated value for 2 minutes without harmful deformation.
5.13 Starting performance
5.13.1 Starting capacity
The motor should be able to start directly at the rated voltage, and the power grid should ensure that the motor terminal voltage is not less than 90% of the rated value during the starting process. When the terminal voltage is lower than 90% during the starting process, the user should consult with the manufacturer. The moment of inertia of the coal mill (J=mr\) allowed to be dragged by the YTM, YHP, and YMPS motors and the recommended matching motor power for the simple coal mill and bowl coal mill shall be in accordance with the provisions of Tables 6 and 7. When the load torque during the acceleration process complies with the corresponding mill characteristics, and the voltage, frequency, and starting method all comply with the requirements of the motor design, it should be able to be started in any of the methods described in 5.13.2 or 5.13.3. 5.13.2 The motor can be started twice continuously at ambient temperature and should stop naturally between the two starts. 5.13.3 When the motor temperature does not exceed its rated load operating temperature, it should be started once. 5.13.4
When the number of continuous starts of the motor is higher than the above requirements, the user should consult with the manufacturer. Table 6
Coal mill model
MG210260
MG210-330
MG250-320
MG250--390
MG290—350
MG290--410
MG290470
MG320-470
MG320-580
MG350-600
MG350-700
MG380-650
MG380-720
MG380-790
MG380--860
Coal mill model
MPS-140
MPS-150
MPS-160
-180
MPS-190
MPS--212
MPS-225| |tt||Motor power kW
Motor power
Speed/min
Kang coal machine model
MPS-245
MPS-255
MPS-265
RP-783
RP-863
RP-923
RP-1003
HP-763
HP-783
HP-803
HP- 863
HP-883
HP-903
HP-923
HP-943
HP-963
HP-983
HP-1003
HP-1103
JB/T7128-93
Table 7 continued
Motor power kw
Speed r/min
The motor is not allowed to be reversed or braked by reverse power supply during operation. 5.13.5
5.13.6 When the power is switched or reclosed, in order to limit the possibility of damage to both the motor and the load machine, the power supply system should be designed to ensure that at the moment of switching or reclosing, the sum of the residual voltage per Hz of the motor and the voltage loss per Hz of the input power supply does not exceed 1.33 times the rated voltage per Hz based on the rated voltage and power of the motor. 5.14 The motor has a cylindrical shaft extension, which can be made into two shaft extensions according to user needs. 5.15 The motor has three outlet terminals. (If the user needs to increase the outlet terminals, he can negotiate with the manufacturer) From the main shaft extension end, the motor terminal box is placed on the right side of the base. If the two parties have other agreements, it is allowed to place the terminal box on the left side of the base. The motor housing and terminal box should have grounding screws, and a grounding mark should be set near the grounding screw. This mark should be guaranteed to be indelible during the entire service life of the motor. 5.16 When the alphabetical sequence of the outlet terminals is the same as the voltage phase sequence of the three-phase power supply, the motor should rotate clockwise when viewed from the main shaft extension end. Motors equipped with unidirectional fans should be marked with permanent marks on the motor to indicate the direction of rotation. 5.17 The buried dimensions of the motor stator windings and bearing measuring components shall be negotiated between the user and the manufacturer. 5.18 The air-water cooler of the motor must undergo a water pressure test, and the test water pressure should not be less than 600KPa. The maximum working water pressure is 200KPa. If the user has higher requirements, he can negotiate with the manufacturer. 6
Inspection rules
Each motor must pass the inspection before it can leave the factory, and a product inspection certificate shall be attached. 6.1
6.2 Each motor shall be inspected and tested. The inspection and test items include: mechanical inspection (according to Article 6.5 of this standard): determination of insulation resistance of stator winding to housing and between windings (cold insulation resistance can be measured during inspection and test, but it should be ensured that the insulation resistance in hot state is not lower than the requirements of Article 5.2 of this standard), determination of DC resistance of stator winding in actual cold state; c.
Withstand voltage test;
Interval withstand voltage test,
Short-time voltage rise test (if test e has been carried out, this test may not be carried out); measurement of no-load current and loss (no-load characteristic curve shall be measured for type test); measurement of locked-rotor current and loss (locked-rotor characteristic curve shall be measured for type test); overspeed test (according to the provisions of Article 6.6 of this standard); vibration measurement;
Water pressure test of air-water cooler.
Type test shall be carried out in case of any of the following situations: a
During trial production,
When the changes in motor design or process are sufficient to cause changes in certain characteristics and parameters; when the inspection test results and the previous type test results have unacceptable deviations; regular sampling test.
Type test items of motors include: bzxZ.net
All items of inspection test;
Temperature rise test;
Efficiency and power factor determination;
Short-time over-torque (or over-current) test:
Maximum torque determination;
Minimum torque determination during starting;
Noise determination;
6.5 Mechanical inspection items of motors include; g
Rotation inspection: When the motor rotates, It should be smooth and brisk, without stagnation; Appearance inspection: Check whether the motor is assembled completely and correctly, the paint on the motor surface should be dry, uniform, without stain, damage, cracks, etc.; Installation dimensions, external dimensions and key dimensions inspection; Installation dimensions and external dimensions should comply with Table 1 and the agreement between the user and the manufacturer, tolerances should comply with the provisions of GB4772.2, and the dimensions of keyways and keys should comply with the provisions of GB1095 and GB1096. 6.6 Article 6.2 of this standard i can be spot-checked, and the inspection method shall be determined by the enzyme manufacturer. 6.7 The various test methods specified in Article 6.2 (except e, j, k) and Article 6.4 (except &) of this standard shall be carried out in accordance with GB1032. Article 6.2 e can be carried out in accordance with JB/Z293 after the line is offline and before wiring. Article 6.2 j shall be carried out in accordance with GB10068. The g of Article 6.4 shall be carried out in accordance with GB10069. The inspection of the installation dimensions and tolerances specified in Article 6.5 shall be carried out in accordance with GB4772.2. The test of the protection level of the motor housing 6.8 can be carried out when the product structure is finalized or when there are major changes in the process. The test method of the housing protection level shall be carried out in accordance with GB4942.1. It is allowed to conduct the enclosure protection test on representative products of small size with the same structure, process and material. The number of each test can be one. The whole motor is only tested for waterproofness, and the dustproof test can only be conducted on the bearing and terminal box structural components, or the drawings can be reviewed by the identification test unit. 7
Marking, packaging and service life
7.1 The nameplate material and the data engraving method on the nameplate should ensure that the handwriting is not easily erased during the entire service period. 7.2 The nameplate shall be fixed on the upper part of the motor base and shall indicate the following items: 8
Manufacturer name:
Motor name;
Motor model:
Enclosure protection grade; (Allowing to make a separate nameplate) Rated frequency
Rated power
Rated current
r/mins
Rated speed
Rated voltage
Insulation grade:
Temperature rise limit;
Wiring mode,
Manufacturer production year and month and production number;
Weight kgt
Standard number.
JB/T7128-93
The outlet of the motor stator winding and the wiring position of the terminal board shall be marked with corresponding marks, and the handwriting shall not be easily worn during the entire use period of the motor. The marks shall be in accordance with the provisions of Table 8. Table 8
Winding name
First phase
Second phase
Third phase
Air-water cooling The cooler of the motor should be equipped with a separate nameplate, indicating the following items; 7.4
Maximum water inlet temperature;
b. Water flow:
Maximum water pressure.
Outlet terminal mark
The shaft extension key of the motor must be tied to the shaft, and the shaft extension and key surface should be rust-proof and protected. 7.6
The packaging of the motor should ensure that it will not be damp or damaged due to poor packaging within one year from the date of shipment under normal conditions. The words and signs on the outer wall of the packaging box should be clear and neat, and the contents are as follows: 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, and the size 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. The motor shaft extension key, operation and maintenance instructions and product certificate should be provided to the user at random. If the user uses and stores the motor correctly in accordance with the provisions of 7.8
the operation and maintenance instructions, the manufacturer should ensure that the motor can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer. If the motor is damaged or fails to work properly due to poor manufacturing quality within the specified time, the manufacturer shall repair or replace parts or motors for the user free of charge.
Additional Notes:
JB/T.712893
This standard is proposed and managed by the Shanghai Electric Science Research Institute of the Ministry of Machinery Industry. This standard is drafted by the Shanghai Electric Science Research Institute of the Ministry of Machinery Industry. The drafters of this standard are Wu Xiaozheng, Song Xinhui, Zhang Yi and 134
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