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In the operation of the oil pump motor, the failure of the bearing part is the most common, because the bearing is the more wearable part of the motor and the heaviest part of the load. In general motor operation, the bearing temperature does not exceed 95 degrees. If it exceeds this temperature, it will be easily damaged. After the finishing of the Dalan motor, the damage analysis and countermeasures of the motor bearing are explained.
First, the bearing common fault
The main reason for bearing damage:
(1) The choice of grease for the bearing should be appropriate, and should be selected according to its type and operating conditions. The filling amount of the grease should be suitable. Generally, the bearing chamber is 1/2-2/3, and the grease is too much. It will melt and flow directly, smash into the winding and corrode the winding.
(2) Improper installation of the bearing or incorrect installation of the pulley, the external force causes the inner and outer rings of the bearing to be mounted, resulting in inflexible rotation and damage to the bearing.
(3) Bearing roller ball, the inner casing ring ball bracket is seriously worn and gold peeling occurs, causing abnormal noise of the motor, so that the motor broom is burned.
(4) There is no sizing in the axial direction of the motor, and the size between the bearing outer cover and the bearing outer casing. When the motor is running, the rotor expands when it is thermally expanded, causing the bearing to heat up.
(5) The motor end cover is not good, the stop is not tight, or the bearing cover is uneven, so that the ball rotates out of the track and generates heat.
(6) The protection is not good, the water or dust inside the bearing makes the bearing not well lubricated and damaged. There are many reasons for the motor failure. The root cause is electrical and mechanical. The general mechanical reasons are mostly, and the bearing damage accounts for more than 70% of the motor failure. Therefore, preventing the bearing damage can greatly reduce the motor failure rate. The following is a detailed analysis of the causes of bearing damage and preventive measures.
Second, the analysis of the causes of damage to bearings and countermeasures
The bearing cannot be directly observed during operation, but the bearing abnormality can be detected by noise, vibration, temperature, lubricant, and the like. Representative examples of bearing damage:
1, crack defects
Some of the notches have cracks. The reasons are as follows: the impact load of the main machine is too large, the interference between the main shaft and the bearing is large; and the crack is caused by the large peeling friction; the precision during installation is poor; the use is improper.
Countermeasures: Check the conditions of use. At the same time, set appropriate interference and check the materials, improve the installation and use methods, and check the lubricant to prevent friction cracks.
2. Metal stripping on the raceway surface
The running surface is peeled off. After peeling, it is obviously concave and convex. The reason is that the bearing rolling body and the inner and outer ring raceways are subjected to periodic pulsating loads, thereby generating cyclically varying contact stresses. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the rolling elements or the inner and outer ring raceways.
Countermeasures: The conditions of use and the selection of bearings and clearances should be re-examined, and the machining accuracy, installation method, lubricant and lubrication method of the shaft and bearing housing should be checked.
3, burns
The bearing heats up and discolors, and the burn cannot be rotated. The cause of burns is generally insufficient lubrication.
Countermeasure: Select the appropriate clearance (or increase the clearance), check the type of lubricant, ensure the injection amount, check the use conditions, prevent the positioning error, and improve the bearing assembly method.
4. The cage is broken. The rivet is loose or broken, and the rolling elements are broken. The reasons are: excessive torque load, insufficient lubrication, frequent fluctuations in speed, large vibration, and the bearing is installed under tilted state, and foreign matter is stuck.
Countermeasure: To find out whether the conditions of use and the lubrication state are suitable, pay attention to the use of the bearing, and study whether the choice of the cage is appropriate and whether the rigidity of the bearing housing is required.
5, creep
The inner or outer diameter surface slips, causing a mirror or discoloration, sometimes getting stuck.
Countermeasure: To re-examine whether the interference is appropriate, check the conditions of use and check the accuracy of the shaft and bearing housing.
6, rust corrosion
The surface is partially or completely rusted, and the rolling elements become rusted in a line.
Countermeasures: To prevent rust in storage, re-apply oil-applied packaging on a regular basis, strengthen sealing performance, regularly check lubricants, and replace oil quality unqualified or deteriorated in time, and use bearings properly.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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