1. The bearing produces a "squeaky" sound.
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Cause Analysis: The retainer and rolling elements may vibrate and collide regardless of the type of grease used, especially when torque, load, or radial clearance is high.
Solution: A. Improve the design of the retainer. B. Use bearings with smaller clearances or apply preload. C. Reduce torque and installation errors. D. Choose high-quality grease.
2. Continuous "humming" noise.
Cause Analysis: When the motor runs without load, it emits a buzzing sound similar to a buzzer. There is also abnormal axial vibration and a "beep" sound when turning on or off.
Specific Features: Poor lubrication conditions are common in winter, especially for motors using ball bearings at both ends. This is often due to unstable vibrations from poor shaft alignment.
Solution: A. Use high-performance grease. B. Apply preload to reduce installation errors. C. Use bearings with small radial clearance. D. Enhance the rigidity of the motor housing. E. Improve bearing alignment. Note: The fifth point is the most effective long-term solution, using 02 small groove curvature or 01 large groove curvature.
3. Paint rust causes noise.
Cause Analysis: After the paint dries, chemical components can volatilize and corrode the end face, outer race, and raceway of the bearing, leading to abnormal sounds.
Specific Features: Corrosion affects one side more severely than the other.
Solution: A. Dry the rotor and casing properly. B. Reduce motor temperature. C. Choose suitable paint types. D. Improve ambient temperature around the bearing. E. Avoid oils that cause corrosion, such as silicone and mineral oil. F. Use vacuum dipping processes.
4. Abnormal sound caused by impurities.
Cause Analysis: Poor cleanliness of the bearing or grease leads to irregular noises.
Specific Features: The sound appears occasionally and randomly, especially at high speeds.
Solution: A. Choose high-quality grease. B. Ensure cleanliness before greasing. C. Improve bearing sealing. D. Maintain a clean installation environment.
5. High-frequency "clicking" sound.
Specific Features: The sound frequency changes with bearing speed, mainly caused by surface waviness.
Solution: A. Improve the surface quality of the bearing to reduce waviness. B. Minimize damage. C. Adjust clearance and fit, check free-end bearing operation, and improve shaft and housing installation precision.
6. Excessive temperature rise.
Specific Features: After running, the bearing temperature exceeds the normal range.
Cause Analysis: A. Too much grease increases resistance. B. Too small clearance causes excessive internal load. C. Installation errors. D. Sealing friction. E. Bearing crawling.
Solution: A. Use the right amount of appropriate grease. B. Correct clearance and fit, check free-end bearing operation. C. Improve housing accuracy and installation methods.
7. Unsmooth bearing feel.
Specific Features: When manually rotating the rotor, there's a feeling of dirt or blockage inside the bearing.
Cause Analysis: A. Clearance is too large. B. Inner diameter and shaft mismatch. C. Raceway damage.
Solution: A. Keep clearance as small as possible. B. Select proper tolerance zones. C. Improve accuracy and reduce raceway damage. D. Choose suitable grease.