Motor bearing common seven failure reasons and solutions


Causes and solutions of common failures of motor bearings:

1, the retencher sound "hey..." :

Cause analysis: It is caused by vibration and collision between reholder and rolling body. No matter what kind of grease it is, it is more likely to occur when bearing torque, load or radial clearance is large.

Solutions: A, improve the retainer precision; B. Choose bearings with small clearance or apply preload to bearings; C, reduce torque load, reduce installation error; D, choose good fats.

2, continuous buzzer "buzz..." :

Cause analysis: No load operation of the motor is a buzz-like sound, and abnormal axial vibration of the motor, open or shut down when "hum" sound.

Specific features: multiple lubrication state is not good, winter and both ends of the ball bearing motor multiple, mainly shaft aligning performance is not good, axial vibration under the influence of an unstable vibration.

Solution: A, with good lubrication grease; B. Add preload to reduce installation error; C. Choose bearings with small radial clearance; D, improve the motor bearing seat rigidity; E, strengthen the adjustment of bearing.

Note: The fifth point plays the role of fundamental improvement, using 02 small ditch curvature, 01 big ditch curvature.

3. Paint rust:

Cause analysis: As the paint of the motor bearing casing dries, the chemical components volatilized corrodes the end face, outer groove and groove of the bearing, resulting in abnormal sound after the groove is corroded.

Specific features: After corrosion bearing surface rust is more serious than the first side.

Solution: A, the rotor, the casing, dry or dry after assembly; B, reduce the motor temperature; C, choose suitable paint type; D. Improve the ambient temperature of motor bearing placement; E, with suitable oil, fat oil caused less corrosion, silicone oil, mineral oil is the most easy to cause; F. Vacuum dipping process is adopted.

4, impurity sound:

Cause analysis: Caused by the cleanliness of bearings or grease, issued an irregular abnormal sound.

Specific features: occasional sound, when large and small no rules, in high speed motor multiple.

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

5, high frequency, vibration sound "da da......" :

Specific features: sound frequency varies with bearing speed, surface corrugability of parts is the main cause of noise.

Solutions: A, improve the surface processing quality of bearing raceway, reduce the amplitude of corrugability; B. Reduce the damage; C. Correct the clearance preload and fit, check the operation of free end bearing, and improve the precision installation method of shaft and bearing seat.

6. Heating up:

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

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

Solution: A, choose the right oil, appropriate amount; B. Adjust the clearance preload and fit, and check the operation of the free end bearing; C. Improve bearing seat accuracy and installation method; D. Improve the sealing form.

7, bearing feel is not good:

Specific features: Grip the bearing to rotate the rotor when the bearing inside the impurities, block sense.

Cause analysis: A. The clearance is too large; B. Improper fit of inner diameter and shaft; C. Channel damage.

Solution: A. The clearance should be as small as possible; B. Selection of tolerance zone; C, improve the accuracy, reduce the damage of channel; D, grease selection.

Key words: motor bearing; Common failure; The reason; solution

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