**Motor Bearing Abnormal Sound Analysis and Troubleshooting**
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 of the Cause**: The sound may be caused by oscillation between the rolling elements and the raceway, or due to improper lubrication. It could also be related to torque load, radial clearance, or misalignment.
**Solutions**:
- Ensure proper lubrication with high-quality grease.
- Use bearings with smaller clearance or apply a preload.
- Reduce mechanical errors in the system.
- Check for excessive load or misalignment.
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### 2. Continuous "Humming" Noise
**Analysis of the Cause**: This type of noise often occurs when the motor is running without load, similar to a buzzer. It can also be caused by axial imbalance or uneven rotation. In winter, motors with ball bearings at both ends may produce this sound more frequently.
**Features**:
- Unstable oscillation due to poor alignment.
- Noisy during startup or shutdown.
**Solutions**:
- Use smooth and high-performance grease.
- Apply preload to reduce errors.
- Select bearings with smaller radial clearance.
- Increase the rigidity of the bearing housing.
- Improve the self-alignment capability of the bearing.
- Choose appropriate groove curvature (e.g., 02 for small grooves, 01 for large grooves).
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### 3. Rust and Corrosion Sounds
**Cause**: Paint oil on the bearing surface may dry and cause chemical corrosion. This leads to rust on the end face, outer race, and rolling channels.
**Features**:
- Severe rust on one side of the bearing.
**Solutions**:
- Dry the rotor and casing properly.
- Lower the motor temperature.
- Use high-quality paint.
- Improve ambient conditions around the bearing.
- Avoid using mineral or silicone oils that promote rust.
- Consider vacuum dipping processes.
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### 4. Impurity-Related Sounds
**Cause**: Poor cleanliness of the bearing or grease can lead to irregular noises.
**Features**:
- Intermittent and unpredictable sounds.
**Solutions**:
- Use high-quality grease.
- Ensure clean environment before greasing.
- Improve sealing mechanisms.
- Maintain a clean installation area.
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### 5. High-Frequency "Ticking" Noise
**Features**: The sound frequency changes with the speed of the bearing. It is often caused by surface waviness on the raceway.
**Solutions**:
- Improve the quality of the raceway surface.
- Reduce surface imperfections.
- Adjust clearance and preloading.
- Check the free-end bearing’s condition.
- Enhance the precision of the shaft and housing.
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### 6. Temperature Rise Issues
**Analysis**: Excessive heat can occur due to over-greasing, tight clearance, or mechanical misalignment.
**Causes**:
- Over-lubrication increases internal resistance.
- Too little clearance causes excessive internal load.
- Mechanical errors or seal friction.
**Solutions**:
- Use the correct amount of high-quality grease.
- Adjust clearance and preloading.
- Improve the accuracy of the bearing housing.
- Optimize the sealing method.
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### 7. Poor Feel During Manual Rotation
**Features**: When manually rotating the rotor, the bearing feels rough, stuck, or has impurities inside.
**Causes**:
- Excessive clearance.
- Poor fit between the inner diameter and the shaft.
- Damage to the raceway.
**Solutions**:
- Reduce play if necessary.
- Choose appropriate bearing types.
- Improve precision and reduce damage to the raceway.
- Use suitable grease.
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