Analysis and solution of abnormal sound of motor bearing

1. The sound of the retainer “Uh, Uh, U, U…”:
Cause analysis: It is caused by the vibration and collision of the cage and the rolling elements, regardless of the type of grease, which is more likely to occur when the torque, load or radial clearance is large.

Solution: A. Improve the precision of the retainer; B. Choose a bearing with a small clearance or impose a preload on the bearing; C. Reduce the moment load and reduce the installation error; D. Choose a good grease.

2, continuous buzzing “buzz…”:

Reason analysis: The motor is running without load and it makes a sound similar to a buzzer, and the motor has abnormal axial vibration, and there is a “buzzing” sound when it is turned on or off.

Specific characteristics: The lubrication of multiple engines is not good, and the motors with ball bearings at both ends are frequently used in winter. The main reason is that the shaft alignment performance is not good. An unstable vibration is generated under the influence of axial vibration.

Solution: A. Use grease with good lubrication performance; B. Add preload to reduce installation error; C. Select bearings with small radial clearance; D. Improve the rigidity of the motor bearing seat; E. Strengthen the alignment of the bearing.

Note: The fifth point plays a fundamental role in improving, using 02 minor groove curvature and 01 major groove curvature.

3, paint rust:

Cause analysis: As the paint on the motor bearing housing dries, the volatilized chemical components corrode the end face, outer groove and channel of the bearing, causing abnormal noise after the channel is corroded.

Specific characteristics: After being corroded, the bearing surface rusts more seriously than the first surface.

Solution: A. Dry or dry the rotor and casing before assembling; B. Reduce the motor temperature; C. Choose a model suitable for paint; D. Improve the ambient temperature of the motor bearing; E. Use suitable grease. Fat oil causes less rust, and silicone oil and mineral oil are most likely to cause; F. Vacuum dipping process is adopted.

4. Impurity sound:

Cause analysis: caused by the cleanliness of the bearing or grease, an irregular abnormal sound is emitted.

Specific characteristics: The sound occasionally does not occur, there are no rules when it is big and small, and it is frequently sent on high-speed motors.

Solution: A. Choose good grease; B. Improve cleanliness before grease injection; C. Strengthen the sealing performance of the bearing; D. Improve the cleanliness of the installation environment.

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5. High frequency and vibration “DaDa……”:

Specific characteristics: The sound frequency changes with the bearing speed, and the surface waviness of the parts is the main cause of noise.

Solution: A. Improve the surface processing quality of the bearing raceway and reduce the waviness amplitude; B. Reduce bumps; C. Correct the clearance and pre-tightening force and fit, check the operation of the free end bearing, and improve the accuracy of the shaft and the bearing seat installation method.

6. Heating up:

Specific characteristics: After the bearing is running, the temperature exceeds the required range.

Cause analysis: A. Too much grease, the resistance of the lubricant increases; B. Too small clearance causes excessive internal load; C. Installation error; D. Friction of sealing equipment; E. Crawling of bearings.

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Solution: A. Choose the correct grease and use an appropriate amount; B. Correct the clearance pre-tightening force and fit, and check the operation of the free end bearing; C. Improve the bearing seat accuracy and installation method; D. Improve the sealing form.

7. The bearing feels bad:

Specific characteristics: When you hold the bearing to rotate the rotor, feel the impurities and blockage in the bearing.

Cause analysis: A. Excessive clearance; B. Improper fit between inner diameter and shaft; C. Channel damage