JB/T 6518-1992 Basic technical requirements for large DC motors for rolling mills JB/T6518-1992 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Basic Technical Conditions for Large DC Motors for Rolling Mills Subject Content and Scope of Application
JB/T6518--92Www.bzxZ.net
This standard specifies the structural type, performance requirements, test methods and acceptance rules for large DC motors for rolling mills. This standard applies to DC motors with each armature greater than 4kW/(r/min) for driving rollers. The motors can be powered by static rectifier power supplies or DC generator sets. This standard also applies to DC generators with a power supply of more than 1500kW. Those not specified in this standard shall comply with the relevant provisions in GB755. Note: DC motors with similar working conditions and their power generators with a power less than 4W/r/min can refer to this technical condition for implementation. 2 Reference standards
GB1311
GB1971
GB1993
Basic technical requirements for rotating electrical machines
Motor structure and installation type code
DC motor test method
Motor terminal marking and rotation direction
Motor cooling method
GB10068
GB10069||tt ||Motor housing protection grade
Determination method and limit of vibration of rotating motor
Determination method and limit of noise of rotating motor
GB2900.33
3 Motor classification
Electrical terminology converter
3.1 Humanoid DC motor
Large DC motors are divided into the following three categories according to the nature of load and operation mode: 3.1.1 Class I motors
Used to drive ordinary metal rolling mills and their auxiliary machinery without continuous overload requirements, designed for unidirectional or bidirectional operation as needed. Its characteristics are:
Has a strong mechanical structure;
b. Has a high short-term overload capacity;
3.1.2 The second type of motor
is used to drive metal rolling mills and their auxiliary machinery with continuous overload requirements other than ordinary metal rolling mills and reversible hot rolling mills. In addition to the characteristics of the first type of motor, it also has the following characteristics: a. Has continuous overload capacity;
b. Has a small moment of inertia, suitable for rapid speed increase and decrease; c.
Has a large weak magnetic speed ratio.
3.1.3 The third type of motor
is used to drive reversible hot rolling mills and their auxiliary machinery. Its characteristics are: a.
Has a strong mechanical structure and a small moment of inertia, suitable for rapid reversal and bearing sudden heavy loads; Approved by the Ministry of Machinery and Electronics Industry on December 21, 1992 and implemented on May 1, 1993
Has a high short-term overload capacity.
3.2 Large DC generators
JB/T6518—92
The DC generators that supply power to the three types of DC motors listed above should have the electrical, mechanical and overload requirements that meet the requirements of the above motors. 4 Standard structural types, protection levels and cooling methods 4.1 The standard structural types of large DC motors for rolling mills are horizontal, seat-type sliding bearings, and cylindrical shaft extensions. According to GB997, the installation type codes are:
DC motors: IM7311 and IM7321
IM7521 and IM7531
DC generators: IM7111 and IM7121
IM7115 and IM7125
4.2 The protection levels of large DC motors for rolling mills are IP23 and IP44 according to GB4942.1. 4.3 According to GB1993, there are two cooling methods for large DC motors for rolling mills: IC17 and IC37. 4.4 The user should specify the structural type, protection level and cooling method of the motor when placing an order. If there are special requirements, they should be negotiated with the manufacturer when placing an order.
5 Technical requirements
5.1 The insulation level of the motor is F.
5.2 The motor rating is a continuous rating based on the S1 working system. 5.3 Operating conditions of the motor:
5.3.1 The altitude shall not exceed 1000m.
5.3.2 The ambient and air inlet temperature shall not exceed 40℃. 5.3.3 The relative humidity of the cooling air shall not exceed 90%. 5.3.4 The cooling air shall not contain acid, alkali, salt, oil or other gases that are harmful to the insulation and commutation of the motor, and the dust content of the air shall not exceed 0.15m/m
5.4 Large DC motors for rolling mills can be powered by static rectifier power supplies or DC generators. 5.4.1 When powered by static rectifier power supplies, the number of rectifier pulses (GB2900.33) shall not be less than 6, and the phase control factor (GB2900.33) at rated base speed, rated armature voltage and rated load shall not be less than 85%. 5.4.2 The performance standard of large DC motors for rolling mills is based on the peak ripple factor (GB2900.33) of the power supply not exceeding 6% at rated base speed, rated voltage and rated load. 5.5 Large DC motors for rolling mills shall be able to withstand the following short-term overload for 1 min. The overload requirements for the first and second category motors are shown in Table 15.5.1
Percentage of base speed
300 or above
5.5.2 Overload requirements for the third category motors are shown in Table 2492
Occasional use
Percentage of rated current
Regular use
Percentage of base speed
JB/T6518-92
Occasional use load
Percentage of rated torque at base speed
Percentage of rated current
Regular use load
Percentage of rated torque at base speed
Note: 1) The approximate speed that occurs when the motor magnetic field is adjusted to 100% base speed under 100% load and the load listed in the table is applied.
percentage of rated current
When the motor speed is between the two base speed percentages listed in the two tables above, its short-term overload capacity is linearly related to the speed. 5.5.3 DC generator
The overload capacity of the DC generator at rated speed should meet the requirements of the motor. Occasional short-term overload refers to the ability of the motor to withstand a load exceeding the rated load for 1 minute in rare or emergency situations. 5.5.4
It is recommended that the instantaneous breaking device of the circuit breaker be adjusted according to the occasional short-term overload capacity. Frequent short-term overload capacity refers to the ability of the motor to withstand a load exceeding the rated load repeatedly (as part of the normal working cycle). After the short-term overload operation, it must be operated with a light load so that the root mean square value of the load for the entire load cycle of the motor does not exceed its continuous rating. During the short-term overload operation time, its temperature rise must also be limited to not exceed the allowable temperature rise value. 5.6 Large DC motors for rolling mills should be able to withstand the following continuous overloads. 5.61
The second category motor and its supply DC generator shall be able to withstand the following loads: a.
Continuous operation with 115% rated current within the rated voltage and rated speed range. Under this load, the temperature rise will be higher and other performances may be different from the specified values ​​under rated conditions. Under rated voltage and rated speed range, immediately after continuous operation under rated load, run with 125% rated current for 2h. b.
The temperature rise shall not exceed the provisions of Table 4. Other performances may be different from the rated values ​​under rated conditions. 5.6.2 The first and third category motors and their supply DC generators have no continuous overload capacity. 5.7 The spark level on the commutator of large DC motors for rolling mills should not exceed 1≠ level in all cases from no-load to rated load, from low speed to high speed (two directions should be measured for DC motors with forward and reverse requirements); the spark level should not exceed 2 levels when overloaded (5.5 and 5.6).
5.8 Large DC motors for rolling mills are allowed to be forcedly excited, and the maximum excitation current (stable value) of the motor shall not exceed the rated excitation current (excluding the instantaneous overshoot part). The forced excitation voltage shall not exceed 5 times the rated excitation voltage. 5.9 Within the rated speed range, the allowable current change rate of large DC motors for rolling mills shall not be lower than the values ​​listed in Table 3. Table 3
Types of motors
First, blue motors and their power generators Second class motors and their power generators
Note: (The current change rate refers to the average current change rate, excluding the influence of pulsation. 1%--rated current
Current change rate
401%/s
60~1001%/s
JB/T6518
0Large DC motors for rolling mills shall not exceed the temperature rise of each part in Table 45 under the specified operating conditions, rated load and rated ventilation conditions.10
Regulations.
Armature windings other than 2
Surface uninsulated single-layer excitation windings and bare copper windings
iron cores and mechanical parts in contact with or adjacent to insulation
Measurement methods
Thermometer method
Resistance method
Degree meter method
Resistance method
Overflow meter method
Overflow meter method
Motor temperature rise limit
Category II motors and their generators
100% rated
continuous
125% rated
load for 2h
Category I and III motors and their generators
100% rated
continuous
When the ambient temperature is 40C, the temperature does not exceed 80℃ Note: () Where two measurement methods are listed, no matter which method is used, as long as the temperature rise is within the table value, the test is considered to meet the standard. The 125% rated load 2h temperature rise test should be carried out immediately after the rated load reaches a stable temperature. The allowable vibration value of large DC motors for rolling mills shall be in accordance with the following provisions: 5.11
For speeds of 600r/min and above, it shall not exceed the maximum allowable value specified in GB10068.2. For speeds below 600r/min, the double amplitude value shall not exceed 0.075mm. b.
5.12 The noise of large DC motors for rolling mills shall not exceed the limit value specified in GB10069.3. 6
Test method
6.1 The test of large DC motors for rolling mills shall be carried out in accordance with GB1311. Vibration measurement shall be carried out in accordance with GB10068.1.
Noise measurement shall be carried out in accordance with GB10069.2.
Marking, random documents, spare parts and warranty period7.1
The line end marking and rotation direction of large DC motors for rolling mills shall comply with the provisions of GB1971. The following documents are provided with the large DC motor for rolling mill: a.
Packing list;
Product certificate;
Operation and maintenance instructions;
Technical data;
Appearance drawing for installation:
Stator assembly drawing;
General assembly drawing;
Armature assembly drawing.
Each motor can provide the following spare parts (to be specified in the contract): a.
One set of electric motor:
b. One set of brush box and one set of brush rod;
One set of bearing shell (for each model).
JB/T6518--92
7.4 For large DC motors suitable for this technical condition, the manufacturer shall guarantee that the motors can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer, provided that the users use and store the motors correctly in accordance with the provisions of the manufacturer's operation and maintenance instructions. Within this specified time, if the motor is damaged or cannot work properly due to poor manufacturing quality, the manufacturer shall repair or replace parts or motors for the user free of charge.
JB/T6518-92
Series of large DC motors for rolling mills (supplement)
Series of first and first class motors are shown in Table A1. Table A1
500450400355315280250225200180High
750 710 670 630 600 560 530 500 480790740700 660620590550520490 4708307807306906506105805405104804608708207707206806406005705305004704509509008508007507006606205805505204470450420
900850800750710670630600560530470450420/410850 800 750 710 670 630 600 560 530 470 450 420410 390600 570 530 500 470 450 420 410 390 370 520 490 470 440 410 390 370 330 450 420 390 370 350 330 310
430 400 380 360 340 320 300
390 370 350 330 310
380 360 340 320 300 280
360 340 320 300 280 260
500|560 630 1710 800|900
See Table A2 for the series spectrum of the third category motors. Base
JB/T6518-92
100|908071|635650454035.531.528 High
142126112
160142126
180 160 142
200180160||tt ||200180
200 180
200180160
200180
200180160
5112100
142126
200180160142126112100
200180160142126
112100
180160 142 126
6112100
160142126112100
142 126 112 10090
Additional notes:
This standard is proposed and managed by Harbin Large Electric Motor Research Institute. This standard was drafted by Harbin Large Electric Machinery Research Institute. The main drafters of this standard are Wang Jiemin and Yang Chuanjin. 71
5005604 For large DC motors that meet this technical condition, if the user correctly uses and stores the motors in accordance with the manufacturer's operating and maintenance instructions, the manufacturer shall ensure that the motors can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer. Within this specified period, if the motor is damaged or cannot work properly due to poor manufacturing quality, the manufacturer shall repair or replace parts or motors for the user free of charge.
JB/T6518—92
Series of large DC motors for rolling mills (supplement)
Series of first and second class motors are shown in Table A1. Table A1 | |tt | 4708307807306906506105805405104804608708207707206806406005705305004704509509008508007507006606205805505204470450420
900850800750710670630600560530470450420/410850 800 750 710 670 630 600 560 530 470 450 420410 390600 570 530 500 470 450 420 410 390 370 520 490 470 440 410 390 370 330 450 420 390 370 350 330 310
430 400 380 360 340 320 300
390 370 350 330 310
380 360 340 320 300 280
360 340 320 300 280 260
500|560 630 1710 800|900
See Table A2 for the series spectrum of the third category motors. Base
JB/T6518-92
100|908071|635650454035.531.528 High
142126112
160142126
180 160 142
200180160||tt ||200180
200 180
200180160
200180
200180160
5112100
142126
200180160142126112100
200180160142126
112100
180160 142 126
6112100
160142126112100
142 126 112 10090
Additional notes:
This standard is proposed and managed by Harbin Large Electric Motor Research Institute. This standard was drafted by Harbin Large Electric Machinery Research Institute. The main drafters of this standard are Wang Jiemin and Yang Chuanjin. 71
5005604 For large DC motors that meet this technical condition, if the user correctly uses and stores the motors in accordance with the manufacturer's operating and maintenance instructions, the manufacturer shall ensure that the motors can operate well within one year of use, but not more than two years from the date of shipment from the manufacturer. Within this specified period, if the motor is damaged or cannot work properly due to poor manufacturing quality, the manufacturer shall repair or replace parts or motors for the user free of charge.
JB/T6518—92
Series of large DC motors for rolling mills (supplement)
Series of first and second class motors are shown in Table A1. Table A1 | |tt | 4708307807306906506105805405104804608708207707206806406005705305004704509509008508007507006606205805505204470450420
900850800750710670630600560530470450420/410850 800 750 710 670 630 600 560 530 470 450 420410 390600 570 530 500 470 450 420 410 390 370 520 490 470 440 410 390 370 330 450 420 390 370 350 330 310
430 400 380 360 340 320 300
390 370 350 330 310
380 360 340 320 300 280
360 340 320 300 280 260
500|560 630 1710 800|900
See Table A2 for the series spectrum of the third category motors. Base
JB/T6518-92
100|908071|635650454035.531.528 High
142126112
160142126
180 160 142
200180160||tt ||200180
200 180
200180160
200180
200180160
5112100
142126
200180160142126112100
200180160142126
112100
180160 142 126
6112100
160142126112100
142 126 112 10090
Additional notes:
This standard is proposed and managed by Harbin Large Electric Motor Research Institute. This standard was drafted by Harbin Large Electric Machinery Research Institute. The main drafters of this standard are Wang Jiemin and Yang Chuanjin. 71
500560
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