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If abnormal sound occurs in the bearing of high-speed motor in use, it may be a precursor to need to be repaired. This paper summarizes several common situations for your reference.



1. Sounds of ripple and ripple

Vibration and collision between the retainer and the rolling element may occur regardless of the type of grease. It is easier to produce when the bearing moment, load or radial clearance is large.

Solution: Improve the accuracy of retainer, select bearings with small clearance or apply preload to bearings, reduce moment load, reduce installation error and select good grease.



2. Buzz

When the motor runs without load, it produces a sound similar to buzzing, and the motor has abnormal axial vibration. There is buzzing when the motor is turned on or off.

Most of them occur in the motor with ball bearings in bad lubrication condition and in winter. The main reason is the unstable vibration under the influence of axial vibration when the performance of axis alignment is not good.



3. Impurity Sound

Caused by bearing or high-quality cleanliness, an irregular abnormal sound is emitted, sometimes no sound, sometimes large or small, frequently occurring on high-speed motors.

Solution: Choose good grease, improve cleanliness before grease injection, strengthen sealing performance of bearings, and improve cleanliness of installation environment.



4. Beep-beep voice, beep-beep voice, beep-beep voice, beep-beep voice, beep-beep voice, beep-beep voice, beep-beep voice and beep-beep voice

Sound frequency varies with bearing speed. Surface waviness of parts is the main cause of noise.

Solutions: Improve the surface processing quality of bearing raceway, reduce the amplitude of corrugation, reduce bumps, correct clearance pre-tightening force and coordination, check the operation of free-end bearings, improve the precision installation method of shaft and bearing seat.