"1. The holder emits a 'Shi Lee Shi Lee...' sound:
Analysis: This noise is caused by vibrations and collisions between the cage and rolling elements, which can occur regardless of the type of grease used. It is more likely to happen when there is high torque, heavy load, or excessive radial clearance.
Solution: A. Improve cage precision; B. Use bearings with smaller clearances or apply preload; C. Reduce torque and load, and minimize installation errors; D. Choose high-quality grease.
2. Continuous buzzing sound:
Analysis: A beeping sound occurs during no-load operation of the motor, accompanied by abnormal axial vibration. When starting or stopping, an 'Om' sound may be heard. This is typically due to poor lubrication, especially in winter when both ends of the ball bearings are affected. Poor shaft alignment leads to unstable vibrations.
Solution: A. Use high-quality lubricating grease; B. Apply preload and reduce installation errors; C. Choose bearings with small radial clearance; D. Enhance the rigidity of the motor bearing. Note: The fifth point plays a fundamental role in improving the use of 02 small groove curvature and 01 groove curvature.
3. Paint rust:
Analysis: Motor bearing shells dry out, leading to corrosion from volatile chemicals on the bearing surface, outer grooves, and raceways, resulting in abnormal sounds after corrosion.
Features: Rust damage is more severe than in the first case.
Solutions: A. Dry the rotor and housing before assembly; B. Lower motor temperature; C. Select appropriate paint models; D. Improve ambient temperature around the bearing; E. Avoid greases that cause rust, such as silicone oil and mineral oil; F. Use vacuum impregnation process.
4. Impurity-related noise:
Analysis: Caused by dirt in the bearings or grease, resulting in irregular and abnormal sounds.
Features: Sounds may appear occasionally or randomly, especially in high-speed motors.
Solutions: A. Choose quality grease; B. Improve cleanliness before greasing; C. Enhance bearing sealing; D. Ensure a clean installation environment.
5. High-frequency vibration sound 'Da Da...':
Features: The sound frequency changes with the bearing speed, mainly caused by surface waviness on the bearing components.
Solutions: A. Improve the quality of the raceway surface processing to reduce waviness amplitude; B. Minimize bumps; C. Adjust preload and clearance correctly, check the free end of the bearing, and improve shaft and bearing installation accuracy.
6. Excessive heating:
Features: Bearing temperature exceeds the required range during operation.
Analysis: A. Too much grease increases resistance; B. Too small internal clearance causes excessive load; C. Installation errors; D. Sealing friction; E. Bearing creep.
Solutions: A. Choose the right amount of proper grease; B. Correct preload and clearance, check the free end of the bearing; C. Improve bearing accuracy and installation methods; D. Optimize sealing design.
7. Poor bearing feel:
Features: Rotating the rotor feels like there are impurities or blockages inside the bearing.
Analysis: A. Excessive clearance; B. Incorrect fit with the shaft diameter; C. Groove damage.
Solutions: A. Keep clearance as small as possible; B. Choose appropriate tolerance zones; C. Improve accuracy and reduce groove damage; D. Select suitable grease."
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