Asynchronous motor bearing too tight or too loose how to do?

If the bearing and shaft or cooperate with tight cover and sleeve bearing diameter ( Small tolerance) Strongly pressed or when, device to pack bearing cover partial, can make axis to accept to the external force, the bearing due to the tight fever, influence the normal operation of the motor. Once found bearing too close, can be the basis of tolerance size sand grinding shaft or the shaft on a cylindrical grinding machine stop processing. If due to improper assembly is too tight, should to assembly; If be the unsmooth not smooth oil viscosity is too high, smooth oil should be changed. Motor running, the local vibration, mechanical and electric motor repair of repeated disassembly and assembly, bearing the easiest lax, common has the following three kinds of abnormal condition: ( 1) Ball bearings have been broken. ( 2) Loose bearing inner ring with shaft, rendering the rims of relative movement and the rotation phenomenon, commonly known as 'set'. ( 3) Outside the bearing outer ring with end cover is not tight, present rims related to the bearing seat and the phenomenon of movement, commonly known as 'coat'. Due to the above problem, bearing position is not fixed, forming of the stator and rotor friction, overheat the motor parts, serious when the motor will not operate properly. Usually take the following two ways to check: ( 1) Remove the bearing, wiped the smooth bearing inner fat, washed with gasoline to bearing, reciprocating and outer ring related to the ball with the hand shaking. Good bearing and its clearance can detect out. If the clearance between the inner ring and outer ring is very big, clarify the bearing has been damaged. ( 2) Hand motor shaft, tilt up and down hard, then can find out the bearing looseness. If, contact friction between the rotor or loose levels beyond the normal clearance, the rotor iron core, is to elucidate uranium bearing damage, cannot use. Disposal of the criterion is: any damage of bearing, ball ball bracket broken or damaged, must change into new bearing; When running set of light, but the axis on the lathe, with a knurled knife on the surface of shaft rolling pattern, but this is emergency measures, a better approach is to set ring, ring and the shaft with a static, with the place bolt the parting surface. The best way is in the part of the shaft and bearing contact spraying a layer of metal material ( Such as nickel) , such disposal, the use of the bearing for a long time.