Items and contents of minor repair, medium repair and overhaul of three-phase asynchronous motor
Release time:
2021-03-04 16:22
Items and contents of minor repair, medium repair and overhaul of three-phase asynchronous motor
1. Minor repair projects:
1) Blow and clean the motor and do a general inspection.
2) Replace local brushes and springs and make adjustments.
3) Clean the collector ring, check and deal with local insulation damage, and carry out repair work.
4) Clean the bearings, inspect and change the oil.
5) Deal with local insulation faults in windings, perform winding binding and reinforcement, and wrap lead insulation.
6) Tighten all screws.
7) Deal with loose groove wedges and tooth end plates.
8) Adjust the fan and fan cover and reinforce them.
2. Intermediate repair projects:
1) Contains all minor repair projects. 2) Clean and dry the motor, replace local coils and repair and strengthen winding insulation.
3) Disassemble the motor for inspection and deal with loose coils, slot wedges and fastening parts of each part.
4) Scrape the bearing bush, perform partial repair welding on the bearing bush, and replace the insulating gasket of the sliding bearing bush.
5) Replace the magnetic slot wedge and strengthen the insulation at the winding end.
6) Replace the rotor binding hoop, deal with loose parts, and perform spot welding reinforcement.
7) Perform dynamic balancing test on the rotor.
8) Improve the structure of mechanical parts and install and debug them.
9) Repair the collector ring, turn and grind the copper ring.
10) Do inspection tests and analysis tests.
3. Overhaul project:
1) Contains all the contents of the intermediate repair project.
2) All windings are rewinded and updated.
3) The copper cage rotor guide bars are all updated, welded and tested.
4) The aluminum cage rotor should be completely replaced with a copper cage or all new aluminum bars.
Maintenance cycle of three-phase asynchronous motor
Category 1 J, JD, Y, JB, YSQ, JSQ and other series and other similar models of motors, small and medium-sized cage motors for continuous operation
Major revision: 7 to 10 years; intermediate revision: 2 years; minor revision: 1 year.
Category 2 JR, JRQ, YR, YRQ and other series and other similar models of motors, small and medium-sized wound rotor motors for continuous operation
Major revision: 10 to 12 years; intermediate revision: 2 years; minor revision: 1 year.
Category 3 Motors with short-term repeated operation and frequent starting and braking
Major revision: 3 to 5 years; intermediate revision: 2 years; minor revision: 0.5 years.
Category 4 AC converter units, prime movers, steel rolling asynchronous motors, and large and medium-sized asynchronous motors
Major revision: 20 to 25 years; medium revision: 4 to 5 years; minor revision: 0.5 years.
What are the most basic items included in motor debugging?
Motor debugging is a systematic test of the motor by professional technicians before it is put into use to see whether the motor can be used normally and provide safe and effective power for production in actual life. Today, it is provided by The professional technicians of Xiangtan Motor Maintenance will introduce to you the most basic items included in motor debugging.
The motor should be checked before debugging. The items to be checked include: whether the motor body is intact, whether the motor's lubrication and heat dissipation are working properly, whether the motor's lead wire position is normal, whether the motor's carbon brushes are complete and effective, etc. In short, before the motor is running, Carry out systematic inspection of the motor itself to ensure that all basic systems can work normally.
During the operation of the motor, the best choice is to let the motor run dry for 2 hours. This is very important in actual use and can fully lubricate and run-in the motor.
Finally, pay attention to observe during the operation of the motor:
First, listen to see if there is any noise during the operation of the motor. This is a good way to check whether the motor is normal;
The second is to check whether the motor generates heat during the operation of the motor, which is often encountered during the use of the motor. If similar problems are not handled well, the motor may not work properly during the production process, which will not only affect the normal operation of the motor, but more seriously, cause safety accidents. Therefore, during the debugging process of the motor, Pay attention to every aspect.
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