Motor common mechanical troubleshooting 1, rotor core troubleshooting, rotor are stacked from each other insulated silicon steel is the magnetic circuit part of the motor. Set, the rotor core damage and deformation mainly caused by the following reasons. ①bearing excessive wear or poor assembly, resulting in stator and rotor friction, the core surface damage, resulting in short-circuit between the silicon steel, motor iron loss increases, so that the motor temperature is too high. At this time the use of fine files and other tools to remove burrs, eliminating short-circuit silicon steel, cleaned and painted with insulating paint, and heated to dry. ② remove the old winding force is too large, so that the tamper skew and open to the outside. At this point the application of needle nose pliers, wood hammer and other tools to be trimmed, so that bad tooth reset, and in the reset of the gap between the silicon steel sheet joined the green shell paper, bakelite and other hard insulating material. ③ due to moisture and other causes of core surface corrosion. At this point need to use sandpaper clean, painted with insulating paint after cleaning. ④ Grouting around the group generates high heat burned iron core bad or tooth department. Available chisel or scraper and other tools to remove the sediment clean, painted with insulating paint drying. ⑤ core and the loose combination between the base, you can tighten the original positioning screw. If the positioning screw fails, you can re-drill positioning holes in the base and tapping, tighten the set screw. 2. Bearing troubleshooting shaft rotation through the bearing support is the heaviest part of the load, but also easy to wear parts. ①fault inspection during operation; rolling bearing oil shortages, you will hear "Gulu Gulu busy" sound; if you hear the non-continuous "stem" sound may be the bearing rims rupture. Bearing mixed with sand and other debris or bearing parts with a slight wear and tear, there will be a slight noise. After disassembly inspection; first look at the bearing rolling body, the inner and outer rims for damage, rust, scar, etc., and then pinch the bearing inner ring, and the bearings set aside, the other hand pushing the outer ring just hard, if the bearing is good , The outer steel ring should be stable, no vibration during rotation and obvious phenomenon of stagnation, outer ring did not back down after stopping the phenomenon. Otherwise, the bearings can no longer be used. The left hand stuck the outer ring, the right hand pinch the inner ring, forced to push in all directions, if you feel very loose when pushed, that is, serious wear and tear. ② fault repair bearing rust on the outer surface can be used 00 sandpaper to erase, and then into the gasoline cleaning; or bearing cracks, inner and outer rings fragmentation or excessive wear bearing, the replacement of the new bearings. When replacing a new bearing, use the same bearing as the original model. 3 spindle troubleshooting ①axis bending; if the bending is not, by grinding journals, slip ring method to repair; if the bending more than 0.2mm, the shaft can be put under the press, the beat pressure correction , After correction of the surface with a lathe cutting polished; if the bending is too large, you need to change the new shaft. ② shaft wear; shaft wear is not big, you can wear a layer of chrome on the journal, and then grinding to the required size; wear more, you can overlay on the journal, and then to the lathe cutting polished; If the journal wear is too large, but also in the journal turning 2-3mm, and then a sleeve, while the heat in the journal, and then turning to the desired size. ③ shaft crack or fracture; shaft transverse crack depth does not exceed 10% -15% of the shaft diameter, longitudinal crack does not exceed 10% of the shaft length can be surfacing remedy, and then fine car to the desired size. If the shaft crack more serious, you need to replace the new shaft. 4. Chassis and end cover overhaul If the case and end caps should be surfacing repair cracks. In the event of bearing boring clearance is too large, resulting in bearing cover with loose, the general punch can be used to drive the bearing wall evenly burr, and then into the bearing cover. For more powerful motor, you can also use the method of plating or plating, and finally the required size of the bearing.