Motor bearing abnormal sound processing

A lot of experienced mechanical maintenance technicians will usually run the sound through the machine to determine whether the device is normal, Tianjin Han Huang Precision Trade Co., Ltd. technical staff to summarize past experience bearing on the motor used to analyze the sound for example.
1, a continuous buzzing sound "hum ... ...":

Analysis: Motor no load operation is to issue similar to the buzzing sound the same, and the occurrence of axial motor abnormal vibration, open or shut down the "Om" sound.

Specific features: multiple lubrication is not good, winter and ends with multiple ball bearing motor, the main axis aligning performance is poor, the axial vibration under the influence of an unstable vibration.

Solution: A, with good lubrication oil; B, plus pre-load, reducing installation error; C, use a small radial clearance of bearings; D, raising the motor bearing stiffness; E, to strengthen the bearing adjustment Mind.

Note: The fifth play the role of improved, with 02 minor groove curvature, curvature of the major groove 01.

2, bearings feel good:

Specific characteristics: When the rotor rotation with the hand bearing impurities are bearings inside, a sense block.

Analysis: A, clearance is too large; B, diameter and axis mismatch; C, channel damage.

Solution: A, as clearance is smaller; B, tolerance zone selection; C, to improve accuracy and reduce the channel of the injury; D, oil use

3, paint rust:

Analysis: As the motor bearing chassis paint after dry out the chemical composition of volatile corrosion of the bearing face, the outer channel and channel to channel erosion occurred after the exception is sound.

Specific characteristics: The bearing surface rust corrosion is more serious than the first surface.

Solution: A, the rotor, casing, drying or after drying assembly; B, lower motor temperature; C, use models to adapt to paint; D, to improve the placement of motor bearing temperature; E, with the adaptation of fat, corrosion caused by low fat, silicone oil, mineral oil most likely cause; F, vacuum dipping technique.

4, temperature:

5, to maintain the acoustic "Hey Hey Lee ... Lee ...":

6, frequency, vibration and sound "da da ......":

Specific features: the sound frequency change with bearing speed, part surface waviness is the main cause of noise.

Solution: A, to improve the bearing raceway surface finish quality and reduce waviness amplitude; B, to reduce bumps; C, amended with the clearance and preload, check the operation of the free end bearings, to improve the precision of shaft and bearing installation method.

7, impurities tone:

Analysis: The cleanliness of the bearings or grease caused abnormal issued an irregular sound.

Specific features: voice sometimes even no, varying no rules, in multiple high-speed motor.

Solution: A, choose good fats; B, before raising grease cleanliness; C, bearing the seal to enhance the performance; D, improving the cleanliness of the installation environment.

Analysis: by the retainer and the rolling vibration, collision generation, no matter how all the possible types of grease, bearing torque, load or when a large radial clearance is more likely to occur.

Solution: A, increase cage fine; B, use a small bearing clearance or pre-load imposed on the bearings; C, reduce the torque load, reducing installation error; D, use good oil.

Specific characteristics: bearing operation, the temperature is beyond the scope of requirements.

Analysis: A, too much grease, lubricants increase the resistance; B, clearance too small to cause internal load is too large; C, installation error; D, sealing equipment, friction; E, bearing the crawl.

Solution: A, use the right oil, the amount due; B, revised clearance and preload with, check the functioning of the free end bearing; C, to improve the bearing accuracy and installation methods; D, improving the seal forms.
 

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