Motor bearing replacement operation

2019 - motor bearing replacement operation process 03 - 12 a, check to make sure the motor bearing need to change reasons: 1) Bearing overheating; 2) Motor vibration is too large; 3) Bearing ring. Second, prepare materials and engineering appliance 1, prepare material: has installed switch, spiral fuse, contactor, thermal relay, button, terminals, etc. , and has set up a good main circuit control board, lead the RV ~ 1. 5毫米,2。 Several meters, 5 mm rubber line all four core stow-wood 1 block and several gasoline, grease, cotton yarn, wool, wood, gasoline, each several grease, cotton yarn, 1 the brush, one oil pan. 2, prepare tools: electrician tongs, electric knife, a screwdriver, phillips screwdriver and a hammer, wooden hammer, each 1 with flat, three jaw drawing a, three jaw a drawing device, insulation resistance meter, steel ( Iron) Tube ( φ 100mm) 1, marker pen 1, 2, and prepare tools: electrician tongs, electric knife, a screwdriver, phillips screwdriver and a hammer, wooden hammer, each 1 with flat, three jaw drawing a, three jaw a drawing device, insulation resistance meter, steel ( Iron) Tube ( φ 100mm) 1 a, 1 marker. Three, motor remove 1, remove the pulley or coupling, first in the end bearing ( Or coupling end) Completes the size tag, the positioning of loose pulley or coupling bolt or pin, then slowly down pulley or coupling with specialized tools. 2, remove the fan cover and the fan. Loosen the clamping bolt, tap the removed. 3, remove the cover of the motor end bearing outside and end cover. In the first frame and marking the end cover the joint ( In order to install recovery when targeting) 。 Remove the bearing cover, loosen and twist the end cover of fastening screws, tap the near end cover ( Mat mat wood) To stand out, in order to take off. 4, at the other end of the cover and stand ready, remove the end cap on the bolt, banging on the end cover, with stand separation ( Mat mat wood) , with the hand will end cover from the stator and rotor, be careful when you take out the rotor, do not scratch the stator windings. 5, the bolt will be connected to the rotor bearing cover removed, the bearing cover and the end cover individually removed from the shaft. Fourth, bearing replacement, motor assembly 1, replacing bearing, use special tools to remove, in the case of bearing stay within the end cover, can stop the end cover mouth up, smoothly on the two pieces of iron plate, cushions to beat with a diameter smaller than the bearing metal, make the bearing outer ring bearing, bearing on; To make sign installation side outwards. 2, to the set, the rotor cleaned, with skin after the tiger or compressed air blowing off dust, clean with brush. 3, flexible sliding bearing is clean; To join the new grease with 1/3 of the bearing chamber volume - commonly It is advisable to 1/2. 4, when the motor assembly, steps, methods, correct, contrary to remove the step sequence assembly step. Five, the insulation test 1, the selection of tools and check; Use 500 v insulation resistance meter, before use check should be made for insulation resistance meter method is in the 'L' and 'E' side open cases, shaking the handle, make top speed 120 r/min, pointer should point to 'oo. In the 'L' short circuit ( And short circuit (' E ' Touching one another) Cases, the rocking handle, pointer refers to '0', insulation resistance meter in good condition. 2, measuring winding insulation; 1) Determination of winding son; Terminal shell, E L termination, winding end of three-phase winding is measured respectively. 2) Measurement of three-phase winding insulation resistance; 'L' and 'E' side respectively by two phase winding under test. The above two kinds of measuring the insulation resistance shall be not less than 0. 5 mΩ 。 Six, no-load commissioning seven, commissioning current generally 50% of the rated current, no vibration, no noise is qualified.