Motor bearing
The cause of the rust of the motor bearing is very complicated. It may be that the bearing is not rust-proof, it may be caused by moisture, and the paint mist may cause rust. It has a close relationship with the type of insulating varnish, the pre-filled grease of the bearing, the treatment method of the motor lacquer and the storage environment of the motor.
To prevent paint rust, the rust prevention capability of the bearing itself must first be improved. The material of the bearing is generally bearing steel. The method of anti-rust treatment generally adopts the anti-rust oil inside the bearing. After the anti-rust treatment, the motor factory adds the grease by itself. However, if the rust preventive oil is applied too thick, it will cause a decrease in lubrication performance. Although paying attention to improving the rust resistance of the grease has certain effects, the most effective method is to change the composition of the paint.
Since the paint will produce harmful acid gases, it will of course cause the bearings to rust. The specific solution is:
1. Try to use solvent-free paint.
2. If possible, use an impregnating lacquer that does not contain oxidizing components, such as epoxy urethane or undenatured epoxy immersion lacquer.
3. When using melamine acid impregnating varnish, the curing temperature and curing time should be adjusted. The curing temperature is slightly higher than 130 °C (such as 135 °C) and the curing time is more than 180 min, and the process must be strictly performed, especially at high temperature. In the wet season, because of the concept of rust prevention, the drying (curing) time of the paint specified in the paint factory sample is not necessarily sufficient, and the motor has a specific inner shape.
4. Use a paint that does not contain volatile acids.
5. Choose a paint that is resistant to hydrolysis.
6, try to use mineral oil bearing grease.
7. When the motor factory injects grease by itself, in order to avoid noise and possible rusting of water vapor and dust entering the bearing in the air, the grease container should be sealed, even in the case of grease injection. The amount of grease should be determined according to the standard. For example, when the 6202 bearing is used, the reference value is in the range of 0.60 to 0.80g, and the grease filling process should be kept clean and dry.
8. Use a plastic film package with micropores to make the motor breathable before it is activated. When the package is sealed with a plastic film, the paint gas will remain in the bearing and the water will condense and should be avoided.
9. Grease may deteriorate under the influence of high temperature when the motor cover is sprayed or painted.
10. Consult with the bearing manufacturer to use a more effective rust inhibitor when the bearing is produced.
11. In order to completely solve the paint rust, it can be considered by the motor manufacturer, the bearing production plant and the paint production unit to jointly discuss various aspects of the ability to solve the corrosion of the bearing.
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