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Home / News / Technical Knowledge / Permanent magnet motor bearing failure analysis

Permanent magnet motor bearing failure analysis

Bearing failure is a relatively concentrated type of permanent magnet motor failure, which is closely related to the selection, installation and later use and maintenance of bearings. Our company combines some actual analysis cases and data accumulation to briefly classify the faults and causes of bearing structures.
1. Analysis of causes of bearing heating
a. When single-row ball bearings are used at both ends of the permanent magnet motor, due to the thermal expansion and contraction of the rotor, the bearing jacket cannot squirm smoothly in the bearing chamber, and the bearing clearance "eats up", causing the balls to bear a large additional axial load. force.
b. The bearing is too close to the stator and rotor windings, or is affected by the heat radiation of the towed equipment.
c. The bearing part has poor ventilation and heat dissipation.
d. Excessive grease or serious loss of grease causes dry wear of the bearing; or there are impurities in the grease.
e. The excessive fit between the bearing inner sleeve and the shaft, or the bearing outer sleeve and the bearing chamber, tends to cause interference.
f. The machine base is deformed, causing the coaxiality of the stops at both ends to be out of tolerance.
g. The bearing itself is of poor quality.
2. Analysis of the causes of high motor bearing noise
a. Improper selection of bearing clearance.
b. The motor balance is poor.
c. The motor bearing distance is too large.
d. The grease dries up or is lost.
e. The inner outer sleeve of the bearing does not match the shaft and bearing chamber properly.
f. Uneven load.
g. The installation and debugging do not meet the requirements, such as the coaxiality between the motor and the equipment being dragged is poor.
h. The bearing itself is of poor quality, such as loose cage, deformed raceway, etc.
3. Reasons for large vibration in bearing position
a. Bearing clearance is too large.
b. Impurities enter the bearing raceway.
c. The bearing distance is too large.
d. The rotating shaft is not round, causing the raceway of the inner sleeve of the bearing to deform (also the source of noise).
e. Uneven load.
f. The motor assembly may cause injuries to the bearings. For example, if the bearing jacket is hit hard, the rolling elements and raceways may be injured.

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