Can this really solve the problem of motor bearings???

After the motor enters the market, there are relatively more problems with the bearing system. Some problems are related to the quality of the motor itself, while others are related to the customer's use and maintenance. Hengli Motor's friend C specializes in maintaining the motor market. By chance, C talked about the disposal experience he gained in the market and found it quite practical. Hengli Motor immediately recorded it, organized and repaired it, and shared it with everyone.

Bearing overheating

The problem of bearing overheating is the most frequently handled on-site by friend C, with various manifestations and situations, mainly including:

The reason for the problem caused by the lack of oil in the bearing is either the loss of lubricating grease or the deterioration and failure of the grease due to the motor running for too long.

Excessive refueling or oil that is too thick, dirty, or mixed with particulate impurities.

The shaft undergoes bending, incorrect transmission assembly correction leads to eccentricity, and the transmission belt or coupling is too tight, resulting in additional unbalanced bending torque on the shaft and increased friction loss.

The installation accuracy of the end cap or bearing is not high, and the fit is too tight or too loose;

The pelvic structure of the flange end cap forms a closed space with the equipment, sealing the bearing device. Friction heat cannot dissipate and accumulates continuously, leading to bearing overheating.

The vibration during the operation of the motor is inevitable, and the lubricating grease in the bearings may be lost due to it, resulting in dry grinding and heating of the bearings until they overheat and burn out.

The impact of shaft current. Due to the sometimes unbalanced stator magnetic field of large motors, induced electromotive force is generated on the shaft. The reason for the unbalanced magnetic field may be due to local corrosion of the iron core, increased resistance, and uneven air gap between the stator and rotor, which leads to the generation of shaft current and eddy current heating.

In order to prevent eddy currents in the motor bearings, an insulation plate should be placed under the bearing seat at one end of the motor. At the same time, insulation plate sleeves should be added to the bolts, pins, oil pipes, and flanges at the bottom of the bearing seat to cut off the eddy current path. The best way to solve this problem is to adopt an insulated bearing system structure, and we will discuss and exchange information on this issue in a separate section.

Corrosion of bearings

The occurrence of bearing corrosion during motor operation is relatively rare. Generally, it is caused by inadequate tightening of the bearing end cap bolts, resulting in water ingress into the motor during operation and lubricant failure. If the motor does not run for a long time, the bearings will also rust due to the continuous erosion of moisture.

Loose retaining frame

Loose retaining frames can easily cause collisions and wear between the retaining frame and rolling elements during operation. In severe cases, it can lead to rivet breakage and deterioration of lubrication conditions, resulting in bearing locking.

The main reason for the failure of the new bearing cage is the defects in material, product accuracy, assembly accuracy, and other aspects.

Fatigue peeling of bearing rolling elements

There are many reasons for the fatigue peeling of rolling elements in bearings, such as defects in the inner and outer raceway of the bearing, excessive clearance of the bearing, expired use of the bearing, and defects in the material of the bearing itself.

The high load and high-speed state that bearings are subjected to during long-term use is also one of the important reasons for bearing fatigue. The rolling elements continuously rotate and slide in the inner and outer raceway of the bearing. The defects of the raceway itself make the surface of the raceway uneven, and the excessive clearance causes the rolling elements to bear high-frequency and high-intensity impact loads during movement. In addition, the material defects of the bearing itself and the out of limit use of the bearing will cause fatigue peeling of the rolling elements.