Analysis of the problem of medium-sized motor bearing

Source: China Bearing Network Time: 2017-11-18

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In the subordinate equipment of the power plant; the electric motor is the primary source of power to complete and ensure the normal operation of the unit; therefore, the loss caused by the motor's attack is quite large; especially the medium-sized electric motor; can seriously affect the safety of the unit. Operation. According to our calculation of motor faults; bearing damage or motor damage caused by bearing damage; accounted for more than 60% of the motor problems; so the treatment of motor bearing damage is also an important problem in dealing with motor problems. According to analysis; Most of the medium-sized motors are "end-end sliding bearing type" layout and "end-end rolling bearing type" layout. Through our summary and analysis of various medium-sized motor maintenance experience; I think the following problems exist:
1. End cap sliding bearing type: Most of these motors have the appearance of bearing bush heat and oil leakage; the corrosion of the stator coil of the motor is formed; and the oil and ash accumulated inside the motor is excessive; the ventilation is poor; The motor temperature is too high and damaged.
2. Box-type high-voltage motor: This motor is a new type of motor produced in China in these years; its function and shape are superior to the "JS series" motor. However, some of the motors produced by some manufacturers have existed in the depiction of bearings. Some lack of; the formation of the motor in the running bearing problems more. These motors are arranged on the outside of the bearing with a small oil-displacement disc from the bearing; so that the grease inside the bearing can be adhered to Sufficient; however, this layout has several shortcomings:
.1), is not conducive to the heat dissipation of SKF bearings and the circulation of grease; the temperature of the bearing during operation is increased; the function of the grease is reduced; then the vicious cycle of increasing temperature is formed; the bearing is damaged.
.2), due to the existence of the bearing oil retaining disc; the motor is in minor repair; the bearing cover can not be viewed; and when the motor is overhauled; the retaining oil can not be removed without removing the oil retaining disc; as long as it is replaced; Necessary dross.
.3), due to repeated maintenance, the oil retaining disc and the bearing should be dismantled; the cooperation between the inner hole of the oil retaining plate and the shaft is loosened; the oil retaining disc is released from the shaft during operation;
3. Double-bearing motor: Some medium-sized motors produced in China today; the load side uses a double-bearing layout. This adds the radial load on the load side; however, it also brings difficulty to the overhaul. During the overhaul of the motor Bearings can not be removed and viewed and it is necessary to replace; otherwise the quality of inspection can not be ensured; the addition of maintenance costs is formed. Others; the motor of this layout; most of the bearings are in operation at higher temperatures; SKF bearings are imported The service life is reduced and damaged.

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