Motor bearing overheating processing method

Bearing is one of the most important support machine parts, usually a motor bearing temperature when the temperature of the motor of the rolling bearing more than 95 ℃, sliding bearing temperature over 80 ℃, is bearing overheating. Can consider to buried near the bearing temperature measuring element, and then through the control circuit to protect the bearings. General motors is inside the motor there is a temperature measuring device. When the motor running bearing overheating is a common fault, its reason is various, sometimes it's hard to accurate diagnosis, and in many cases handled not in time, the result is often cause more damage to the alternator, shorten the life, make motor so that affect the work and production. We in the long-term practice sums up the motor bearing overheating situation, causes and treatment methods. Motor bearing overheating the cause and the treatment method: 1, rolling bearing installation is not correct, tolerance is too tight or too loose. Solution: rolling bearing performance depends not only on the manufacturing precision of the bearing itself, and also cooperate with it in the hole axis and the dimensional accuracy and shape tolerance and surface roughness, with the selection and installation are correct or not. Generally, horizontal motor assembly good rolling bearing only withstand radial stress, but if the bearing inner ring and the shaft with a tight, or bearing outer ring and the matching of the end cover too tight, namely negative allowance is too large, after assembly will make bearing gap is too small, sometimes even close to zero. This rotation is not flexible, in the operation of the fever. If the bearing inner ring and the shaft with too loose, or bearing outer ring and cooperate too loose end cover, the bearing inner ring and the shaft, or bearing outer ring and end cover, relative rotation occurs, the friction heat, caused by overheating of bearings. Usually, the standard will be as a benchmark in parts of bearing inner ring diameter tolerance zone moved below the zero line, the tolerance zone of the same shaft and bearing inner ring form, than it has to do with general benchmark hole formation with much more important. 2, use grease selected may be inappropriate or improper maintenance, quality is bad or has bad, grease or mixed with dust impurities and so on all can cause bearing heating. Solution: add grease too much or too little will cause bearing heating, because too much grease, bearing will produce a lot of friction between rotating parts and fat, and add a little grease, may appear dry friction and heat. So we must adjust the dose of grease, making them approximately 1/2 - bearing chamber volume 2/3. For inappropriate or bad grease should be clean, put on appropriate clean grease. 3, motor bearing cover and cylindrical roller bearing between the axial clearance is too small. Solution: large and medium-sized motor on the non shaft extension end commonly use ball bearings. Using roller bearing shaft extension end, so, when the rotor heat expansion, free elongation. And due to both ends of small motor USES ball bearing, outside its between bearing cover and the bearing outer ring should be a proper clearance, otherwise, bearing might be due to excessive axial thermal elongation and fever. When appear this kind of phenomenon, should be before or rear bearing cover car to go a bit, or between bearing cover and the end cover and a thin MATS, make the end bearing cap and form a sufficient clearance between the bearing outer ring. 4, the motor end cover or bearing cover installed on both sides. Solution: if the motor end cover or bearing cover is installed on both sides are not parallel or check mouth did not rely on strict, will make the ball wide orbits and fever. Must refocus on both sides of the end cover or stop bearing cover mouth flat, and rotate tight fixed bolts evenly. 5, ball bearing, roller, inside and outside the ring, ball bearing severe wear or metal flake. Solution: at this point should be updated bearing. 6, and load mechanical connection. The main reason is that poor coupling assembly, belt tension is too large, and different load mechanical axis of the speech, belt wheel diameter is too small, pulleys are too far away from the bearing, the excessive axial or radial load, etc. Solution: correcting incorrect connection, avoid bearing abnormal reaction. 7, shaft bending. The solution: the bearing force is no longer pure radial force, thus cause bearing heating. Should be tried to bend axis alignment or replace the new shaft. 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