Analysis and solution of abnormal sound types in b

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Analysis and solution of abnormal sound types of motor bearings

cause analysis:

it is caused by the vibration and collision between the retainer and the rolling refrigeration switch and the moving body of the alarm switch, which may occur regardless of the type of grease, and it is easier to occur when bearing torque, load or radial clearance is large


a, improve the precision clamping convenience, firmness and non slip degree of the retainer

b Select the bearing with small clearance or apply preload to the bearing

c, reduce the torque load and reduce the installation error

d, select good grease

2, continuous buzzer

cause analysis:

when the motor runs at no load, it makes a sound similar to buzzer, and the motor has abnormal axial vibration, and there is a buzz back to the oil tank when it is turned on or off

specific characteristics:

multiple poor lubrication state, In winter, the motor with ball bearings at both ends often occurs, mainly due to an unstable vibration under the influence of axial vibration when the shaft centering performance is poor. Solution

a, use grease with good lubricating performance

b, add preload, reduce installation error

c, select bearings with small radial clearance

d, improve the rigidity of motor bearing seat

e, strengthen the centering performance of bearings

note: the fifth point plays a fundamental role in improving, Adopt 02 small groove curvature and 01 large groove curvature

3. Paint rust

9 Cause analysis of PV friction tester:

as the motor bearing shell is painted dry, the volatile chemical components corrode the end face, outer groove and groove of the bearing, so that the abnormal sound occurs after the groove is corroded.

specific characteristics:

the rust on the bearing surface after corrosion is more serious than that on the first side.


A, assemble the rotor, shell, air dry or dry

b, reduce the motor temperature

C Select the model of adaptive paint

d, improve the ambient temperature of motor bearings

e, use adaptive grease, grease causes less corrosion, silicone oil and mineral oil are most likely to cause

f, use vacuum paint dipping process

4, impurity sound

cause analysis:

is caused by the cleanliness of bearings or grease, and sends out an irregular abnormal sound

specific characteristics:

the sound is occasional, sometimes large and sometimes small, and irregular, Solutions to multiple

on high-speed motors:

a, select good grease

b, improve the cleanliness before grease injection

c, strengthen the sealing performance of bearings

d, improve the cleanliness of the installation environment

5, high frequency, vibration and sound clattering

specific features:

the sound frequency changes with the bearing speed, and the waviness of the part surface is the main cause of noise


a, improve the surface processing quality of the bearing raceway, reduce the waviness amplitude

b, reduce the bruise

c, correct the pre tightening force and fit of the clearance, check the operation of the free end bearing, and improve the accuracy of the shaft and bearing seat. Installation methods

6, temperature rise

specific features:

after the bearing operates, the temperature exceeds the required range

cause analysis:

a, too much grease, The resistance of lubricant increases

b, the internal load is too large due to too small clearance

c, the installation error

d, the friction of sealing equipment

e, the creeping of bearings


a, select the correct grease, use the appropriate amount

b, correct the preload and fit of clearance, check the rotation of free end shaft

c, improve the accuracy and installation method of bearing seat

d, improve the sealing form

7 Poor bearing feel

specific features:

feel impurities and blockage in the bearing when rotating the rotor with the bearing in hand

cause analysis:

a, excessive clearance

b, improper fit between the inner diameter and the shaft

c, channel damage


a, the clearance should be as small as possible

b, the selection of tolerance zone

c, improve accuracy and reduce channel damage


d. grease selection

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