What are the routine maintenance tasks for motors?

Items and contents of minor, medium, and major repairs for three-phase asynchronous motors 1. Minor repair items: 1) Blowing and cleaning the motor, along with a general inspection. 2) Replace the local brushes and springs, and make adjustments. 3) Clean the slip ring, inspect and address any damage to the local insulation, and carry out repair work. 4) Clean the bearings, inspect them, and change the oil. 5) Address local insulation faults in the windings, carrying out tasks such as binding and strengthening the windings as well as insulating the leads. 6) Tighten all screws. 7) Deal with the loose slot wedges and tooth end plates. 8) Adjust the fan and fan cover, and reinforce them. 2. Medium repair projects: 1) Include all the contents of minor repair projects. 2) Clean and dry the motor, replace the faulty coils, and repair the insulation of the windings. 3) Disassemble and inspect the motor, addressing loose coils and slot wedges as well as the fastening components in various parts. 4) Scrub and lube the bearing shells, perform local welding on the bearing shells, and replace the insulating gaskets of the sliding bearing shells. 5) Replace the magnetic wedges to enhance the insulation at the ends of the windings. 6) Replace the rotor straps, address any loose components, and reinforce them with spot welding. 7) Perform a dynamic balance test on the rotor. 8) Improve the structure of mechanical components and carry out installation and debugging. 9) Repair the slip ring by turning and grinding the copper ring through mechanical processing. 10) Conduct inspection tests and analysis tests. 3. Major repair projects: 1) Includes all the contents of medium repair projects. 2) The windings are completely rewound and updated. 3) All copper cage rotor bars are replaced, welded, and tested. 4) All aluminum cage rotors should be converted to copper cages or replaced with new aluminum bars. Maintenance cycle for three-phase asynchronous motors: For motors of series such as J, JD, Y, JB, YSQ, JSQ, and other similar models, as well as small and medium-sized squirrel-cage motors operating continuously, major maintenance is required every 7–10 years ； Mid-term repair: 2 years ； Minor repair: 1 year. Category 2: Motors of the JR, JRQ, YR, YRQ series and other similar models, as well as small to medium-sized wound-rotor motors for continuous operation – major overhaul: every 10–12 years ； Mid-term repair: 2 years ； Minor repair: 1 year. Category 3: Motors that operate intermittently for short periods and experience frequent starting and stopping – Major overhaul: every 3–5 years ； Mid-term repair: 2 years ； Minor repair: 0.5 years. Category 4: AC conversion units, prime movers, rolling mill asynchronous motors, and large and medium-sized asynchronous motors – major overhauls: every 20–25 years ； Mid-term repair: 4–5 years ； Minor repair: 0.5 years.