**Motor Bearing Abnormal Sound Analysis and Processing**
Home > Bearing Knowledge > Motor Bearing Abnormal Sound Analysis and Processing
*Source: China Bearing Network | Date: May 31, 2013*
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### 1. Continuous "Clicking" Sounds
**Analysis:** The sound is caused by the vibration of the rolling elements and the raceway, or due to improper lubrication, torque application, load, or radial clearance.
**Solutions:**
- Ensure smooth and consistent operation.
- Use bearings with smaller clearance or apply preloading.
- Reduce torque load and minimize device errors.
- Choose high-quality grease for better performance.
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### 2. Continuous "Humming" Sounds
**Analysis:** This occurs when the motor runs without load, producing a similar buzzing sound. It may also happen during start-up or shutdown. Common causes include poor alignment, unbalanced shafts, or uneven bearing conditions.
**Solutions:**
- Use high-quality and functional grease.
- Apply preloading and reduce device errors.
- Select bearings with small radial clearance.
- Increase the rigidity of the bearing housing.
- Improve the self-alignment capability of the bearing.
- Consider using bearings with 02 small groove curvature or 01 large groove curvature for better performance.
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### 3. Rusting Sounds
**Analysis:** These sounds occur when the paint on the bearing surface dries and reacts chemically, causing corrosion on the end face, outer race, and rolling path.
**Solutions:**
- Dry or heat the rotor and housing properly.
- Lower the motor temperature if necessary.
- Choose appropriate paint types.
- Improve ambient conditions around the bearing.
- Use oil types that are less likely to cause rust, such as synthetic or silicone oils.
- Implement vacuum dipping processes to prevent moisture damage.
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### 4. Impurity-Related Sounds
**Analysis:** These irregular noises are often caused by dirt in the bearing or grease. The sound is inconsistent and varies with speed.
**Solutions:**
- Choose high-quality grease.
- Ensure cleanliness before applying grease.
- Improve the sealing mechanism of the bearing.
- Maintain a clean installation environment.
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### 5. High-Frequency "Ticking" Sounds
**Analysis:** The sound frequency changes with the speed of the bearing. It is usually caused by surface waviness on the raceway or other components.
**Solutions:**
- Improve the quality of the raceway surface and reduce waviness.
- Minimize surface defects or bruises.
- Adjust the clearance and preload, check the free-end bearing, and improve the precision of the shaft and housing.
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### 6. Temperature Rise Issues
**Analysis:** Excessive temperature can be caused by over-greasing, tight clearance, device misalignment, or seal friction.
**Solutions:**
- Use the correct type and amount of grease.
- Adjust the clearance and preload, and check the condition of the free-end bearing.
- Improve the accuracy of the bearing housing and installation method.
- Enhance the sealing system to prevent contamination and overheating.
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### 7. Poor Handling Feel
**Analysis:** When manually rotating the rotor, the bearing feels rough, sticky, or blocked. This could indicate excessive clearance, improper fit between the inner ring and shaft, or damaged raceways.
**Solutions:**
- Adjust the clearance to an optimal level.
- Choose the right type of bearing.
- Improve the precision of the shaft and housing.
- Select suitable grease to ensure smooth operation.
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**Recommended Reading:**
- Rolling Bearing Oscillation Tester
- Polyurethane Coating Non-Marking Bearings
- Import Bearings: Application and Storage
- Inch Tapered Roller Bearings (LM12749/10)
- Plastic Bearing Cage Methods
This article was originally published on [China Bearing Network](http://). Please visit the source for more information.
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