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Analysis and Solution of the Causes of Abnormal Noise in Motor Bearings

editor:admin │ datetime:1970-01-01

Keeping the sound of "making profits..."

Cause Analysis:

The vibration and impact caused by the retainer and the rolling element can be generated regardless of the type of grease. It is more likely to occur when the torque, load, or radial clearance is large.


A, improve the retainer;

B, select a bearing with a small clearance or apply a preload to the bearing;

C. Reduce the moment load and reduce the installation error;

D, choose a good grease.

Continuous beep "hush..."

Cause Analysis:

The no-load operation of the motor produces a sound similar to that of a buzzer, and the motor is abnormally vibrated in the axial direction. When the motor is turned on or off, it has a "click" sound.

Specific features:

Multiple lubrication conditions are not good. In winter, the motor with multiple ball bearings is used at both ends. This is mainly due to unstable vibration caused by axial vibration when the shaft alignment performance is not good.


A. Use grease with good lubrication properties;

B, plus preload, reduce installation errors;

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 improvement role, using the curvature of the 02 ditch and the curvature of the 01 ditch.

Paint rust

Cause Analysis:

Due to the dry paint on the motor bearing housing, the chemical components that are volatilized corrode the end faces, outer grooves, and channels of the bearing, causing abnormal noises that occur after the channel is corroded.

Specific features:

After corrosion, the surface of the bearing is more rusted than the first surface.


A, the rotor, chassis, drying or drying after assembly;

B, reduce the motor temperature;

C, choose to adapt to the paint model;

D. Improve the ambient temperature of motor bearings;

E. Less oil and grease cause less corrosion, and silicone oil and mineral oil are most likely to cause corrosion.

F, vacuum impregnation process.

Impurity sound

Cause Analysis:

Caused by the cleanliness of the bearing or grease, an irregular abnormal sound is emitted.

Specific features:

There are occasional sounds, there are no rules when large and small, and there are multiple occurrences on high-speed motors.


A, choose a good grease;

B. Improve the cleanliness before the injection of fat;

C. Strengthen the sealing performance of the bearing;

D. Improve the cleanliness of the installation environment.

High-frequency, vibrating sound "dada ....."

Specific features:

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


A. Improve the surface quality of the bearing raceway and reduce the waviness amplitude;

B. Reduce bruising;

C. Correct the clearance preload and coordination, check the operation of the free end bearing, and improve the accuracy of the shaft and bearing assembly.


Specific features:

After the bearing operates, the temperature exceeds the required range.

Cause Analysis:

A. Too much grease, lubricant resistance increases;

B. The internal clearance is too large due to excessive clearance;

C, installation error;

D, friction of sealing equipment;

E. Crawling of bearings.


A. Use the right amount of fat and oil;

B. Correct the clearance preload and coordination to check the free end bearing operation;

C. Improve bearing housing accuracy and installation methods;

D, improve the sealing form.

Bearing feel bad

Specific features:

When you use the bearing to rotate the rotor, feel the impurities and hindrance in the bearing.

Cause Analysis:

A, excessive clearance;

B. Improper fit of inner diameter and shaft;

C, channel damage.


A, play as small as possible;

B. Selection of tolerance zone;

C. Improve accuracy and reduce damage to the channel;

D, grease selection.