A relatively concentrated type of permanent magnet motor fault with bearing failure has a great relationship with bearing selection, installation later use maintenance. Our company combines some actual analysis cases data accumulation to simply classify the bearing structure failure causes.

First, bearing heating reason analysis

A. When single-row ball bearings are used at both ends of the permanent magnet motor, because of the rotor thermal expansion cold contraction, the bearing jacket can smoothly creep in the bearing chamber, the bearing clearance "eats up", so that the ball can bear a large additional axial force.

b. The bearing is too close to the fixed rotor winding, is affected by the thermal radiation of the device being dragged.

c. The bearing part is well ventilated heat dissipated.

d. Excessive grease serious loss of bearing dry wear; there are impurities in the grease.

e. The mismatch between the bearing inner sleeve the shaft, the bearing jacket the bearing chamber tends to be interference.

f. The frame is deformed, so that the coaxiality of the ends is out of alignment.

g. The bearing itself is of poor quality.

Second, motor bearing noise cause analysis

a. Improper selection of bearing clearance.

b. Electrodynamic balance difference.

c. Motor bearing distance is too large.

d. Grease is dry lost.

e. Improper combination of bearing inner outer sleeve with shaft bearing chamber.

f. Uneven load.

g. Installation debugging do meet the requirements, such as the motor the driven equipment coaxial difference.

h. The bearing itself is of poor quality, such as loose cage, raceway deformation, etc.