Handling steps of motor vibration

With regard to the use of the motor, what causes the vibration of the motor during operation? What are the main inspection steps when troubleshooting the motor vibration problems? Today, I will briefly introduce the handling steps of motor vibration for you. I hope it can help you.

1. Disconnect the motor from the load, conduct no-load test on the motor, and * * * the vibration value of the motor.

2. Check the vibration value of the motor base. According to GB10068-2006, the vibration value at the base shall not be greater than 25% of the corresponding position of the bearing. If this value is exceeded, the motor foundation is not a rigid foundation.

3. If the vibration of only one of the four or two diagonal feet exceeds the standard, loosen the anchor bolt, and the vibration is qualified, indicating that the feet are not well padded. After the foundation bolts are tightened, the base will deform and vibrate. Tighten the foot pads, realign and tighten the anchor bolts.

4. All four foundation bolts were tightened, and the motor vibration value still exceeded the standard. At this time, check whether the coupling on the shaft extension is flush with the shaft shoulder. If it is uneven, the exciting force generated by the redundant key on the shaft extension will cause the horizontal vibration of the motor to exceed the standard. In this case, the vibration value will not exceed too much, and the vibration value will drop after connecting with the host. Users should be persuaded to use it. During the factory test, the half key is installed in the shaft keyway according to GB10068 - 2006. The extra keys do not add extra stimulation. If you need to deal with it, cut the extra keys by half of the extra length.

5. If the motor vibration does not exceed the standard in the air test, and the vibration under load exceeds the standard, there are two reasons: first, large alignment deviation; One is that the residual unbalance of the rotating part (rotor) of the main engine overlaps with the residual unbalance of the motor rotor. After docking, the residual unbalance of the entire shafting at the same position is large, resulting in large excitation power, which causes vibration. At this time, disconnect the coupling, rotate any one of the two couplings by 180 ℃, and then dock the testing machine, so that the vibration will be reduced.

6. If the vibration speed (intensity) does not exceed the standard, and the vibration acceleration exceeds the standard, only the bearing can be replaced.

7. Due to the poor rigidity of the rotor of the bipolar high-power motor, the rotor will be deformed if it is not used for a long time, and may vibrate when it is rotated again. This is why the motor is not well kept. Under normal conditions, during the storage of bipolar motor, the motor shall be rotated once every 15 days for at least 8 cycles each time.

8. The motor vibration of sliding bearing is related to the assembly quality of bearing bush. Check whether the bearing bush has high points, whether the bearing bush oil is sufficient, whether the bearing bush is tight, whether the bearing bush clearance and magnetic center line are appropriate.

9. Generally, the cause of motor vibration can be judged from the vibration values in three directions. Large horizontal vibration and unbalanced rotor. Large vertical vibration, poor uneven installation foundation; Large axial vibration, poor bearing assembly quality. According to the site conditions and the above factors, find out the real causes of vibration.

10. For the vibration of Y series box motor, special attention shall be paid to the axial vibration. If the axial vibration is greater than the radial vibration, it will do great harm to the motor bearing, which will lead to an axle seizure accident. Pay attention to the bearing temperature. If the positioning bearing heats up faster than the non positioning bearing, stop the machine immediately. This is the axial vibration caused by insufficient axial stiffness of the base, and the base shall be reinforced.