Cause analysis：

The no-load operation of the motor makes a sound similar to the beep, and the axial abnormal vibration of the motor occurs. There is a "buzz" sound when the motor is turned on or off.

Specific characteristics：

The condition of multi engine lubrication is not good. In winter, the motors with ball bearings at both ends are multi engine, which is mainly an unstable vibration under the influence of axial vibration when the performance of shaft centering is not good.

Resolvent：

A、Use grease with good lubricity；

B、Add preload to reduce installation error；

C、Select bearings with small radial clearance；

D、Improve the rigidity of motor bearing seat；

E、Strengthen the centering of bearing。

Note: point 5 plays the role of fundamental improvement, adopting 02 small ditch curvature and 01 large ditch curvature.

Cause analysis：

As the motor bearing shell is dried after painting oil, the chemical components volatilized corrode the end face, outer groove and groove of the bearing, resulting in abnormal sound after the groove is corroded.

Specific characteristics：

After being corroded, the bearing surface is rusted more seriously than the first surface。

Resolvent：

A、Assemble after rotor, casing, drying or drying；

B、Reduce motor temperature；

C、Select suitable paint model；

D、Improve the ambient temperature of motor bearing；

E、With suitable grease, grease causes less corrosion, and silicone oil and mineral oil are most likely to cause；

F、Vacuum impregnation process。

Cause analysis：

Caused by the cleanliness of bearings or grease, an irregular abnormal sound is produced.

Specific characteristics：

The sound is sporadic, large, small and irregular. It is frequently generated on high-speed motor。

Resolvent：

A、Selected grease；

B、Improve cleanliness before grease injection；

C、Strengthen the sealing performance of bearings；

D、Improve the cleanliness of the installation environment.

Specific features:

The frequency of the sound varies with the speed of the bearing, and the surface waviness of the parts is the main cause of the noise.

resolvent:

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

B、Reduce bruise；

C、Correct the preload and fit of the clearance, check the operation of the free end bearing, and improve the precision installation method of the shaft and bearing seat。

Specific characteristics：

After the bearing is running, the temperature exceeds the required range.

Cause analysis：

A、Too much grease increases the resistance of the lubricant；

B、Excessive internal load caused by too small clearance；

C、Installation error；

D、Friction of sealing equipment；

E、Creep of bearing。

Resolvent：

A、Select the right grease and use the right amount；

B、Correct the pre tightening force and fit of the clearance, and check the running condition of the free end shaft；

C、Improvement of bearing pedestal precision and installation method；

D、Improve sealing form。

Specific characteristics：

When rotating the rotor with the bearing by hand, it feels impurities and blocking in the bearing.

Cause analysis：

A、Excessive clearance；

B、Improper fit between inner diameter and shaft； 

C、Channel damage。

Resolvent：

A、The clearance should be as small as possible；

B、Selection of tolerance zone；

C、Improve the accuracy and reduce the damage of ditch；

D、Grease selection。