Method for finding the cause of vibration of three-phase asynchronous motor
2020-10-30 09:15:45
There are many reasons for the vibration of the three-phase asynchronous motor, but the Dalan oil pump motor tells you that the vibration is common in 2-pole, 4-pole and 6-pole motors, and the large-pole motor above 8 poles will not cause vibration due to the quality problem of the motor itself. .
There are many reasons for the vibration of the three-phase asynchronous motor, but the Dalan oil pump motor tells you that the vibration is common in 2-pole, 4-pole and 6-pole motors, and the large-pole motor above 8 poles will not cause vibration due to the quality problem of the motor itself. .
The reason for the vibration of the motor can be easily judged from the following three aspects of the vibration value:
1. The horizontal vibration is large and the rotor is unbalanced;
2, vertical vibration is large, the installation foundation is not good;
3. The axial vibration is large and the bearing assembly quality is poor.
These are just simple judgments. According to the situation on the spot, combined with the above factors, the real cause of motor vibration is found.
Find the cause of motor vibration by following these steps:
1. Disengage the motor from the load, test the motor for air, and check the vibration value.
2. If the vibration test of the motor is not exceeded, the vibration of the load is exceeded, there are two reasons:
1 Finding a large deviation;
2 The residual unbalance of the rotating part (rotor) of the main engine overlaps with the phase of the residual unbalance of the rotor of the motor. After the docking, the residual unbalance of the entire shaft at the same position is large, and the generated exciting vibration force causes vibration.
3. Check the vibration value of the motor foot. The vibration value at the foot plate should not be greater than 25% of the corresponding position of the bearing. If the value exceeds this value, the motor foundation is not a rigid foundation.
4. There is only one or four diagonal vibrations of the four feet exceeding the standard. When the anchor bolts are tightened, the deformation of the frame causes vibration.
5. The four anchor bolts are fully tightened, and the vibration value of the motor is still exceeding the standard. At this time, check whether the coupling of the shaft extension is flat with the shoulder. If it is not flat, the excitation of the excess key on the shaft is excited. The force will cause the horizontal vibration of the motor to exceed the standard.
6, the vibration vibration speed does not exceed the standard, the vibration acceleration exceeds the standard, only the bearing can be replaced.
7. Because the rotor of the two-maximum power motor is poor in rigidity, it will be deformed without using the rotor for a long time, and may vibrate when it is rotated. This is the reason why the motor is not well stored.
8. The motor vibration of the sliding bearing is related to the assembly quality of the bearing bush. It should be checked whether the bearing bush has a high point, whether the bearing oil of the bearing bush is sufficient, the bearing bushing force, the bearing bush clearance, and the magnetic center line are suitable.
9, Y series box motor vibration should pay special attention to axial vibration, such as axial vibration is greater than radial vibration, the damage to the motor bearing is extremely great, will cause the axle accident.
10. After the rotor is dynamically balanced, the residual unbalance of the rotor has solidified on the rotor and will not change. The vibration of the motor itself will not change with the change of location and working conditions. The vibration problem can be handled at the user site. of.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
There are many reasons for the vibration of the three-phase asynchronous motor, but the Dalan oil pump motor tells you that the vibration is common in 2-pole, 4-pole and 6-pole motors, and the large-pole motor above 8 poles will not cause vibration due to the quality problem of the motor itself. .
The reason for the vibration of the motor can be easily judged from the following three aspects of the vibration value:
1. The horizontal vibration is large and the rotor is unbalanced;
2, vertical vibration is large, the installation foundation is not good;
3. The axial vibration is large and the bearing assembly quality is poor.
These are just simple judgments. According to the situation on the spot, combined with the above factors, the real cause of motor vibration is found.
Find the cause of motor vibration by following these steps:
1. Disengage the motor from the load, test the motor for air, and check the vibration value.
2. If the vibration test of the motor is not exceeded, the vibration of the load is exceeded, there are two reasons:
1 Finding a large deviation;
2 The residual unbalance of the rotating part (rotor) of the main engine overlaps with the phase of the residual unbalance of the rotor of the motor. After the docking, the residual unbalance of the entire shaft at the same position is large, and the generated exciting vibration force causes vibration.
3. Check the vibration value of the motor foot. The vibration value at the foot plate should not be greater than 25% of the corresponding position of the bearing. If the value exceeds this value, the motor foundation is not a rigid foundation.
4. There is only one or four diagonal vibrations of the four feet exceeding the standard. When the anchor bolts are tightened, the deformation of the frame causes vibration.
5. The four anchor bolts are fully tightened, and the vibration value of the motor is still exceeding the standard. At this time, check whether the coupling of the shaft extension is flat with the shoulder. If it is not flat, the excitation of the excess key on the shaft is excited. The force will cause the horizontal vibration of the motor to exceed the standard.
6, the vibration vibration speed does not exceed the standard, the vibration acceleration exceeds the standard, only the bearing can be replaced.
7. Because the rotor of the two-maximum power motor is poor in rigidity, it will be deformed without using the rotor for a long time, and may vibrate when it is rotated. This is the reason why the motor is not well stored.
8. The motor vibration of the sliding bearing is related to the assembly quality of the bearing bush. It should be checked whether the bearing bush has a high point, whether the bearing oil of the bearing bush is sufficient, the bearing bushing force, the bearing bush clearance, and the magnetic center line are suitable.
9, Y series box motor vibration should pay special attention to axial vibration, such as axial vibration is greater than radial vibration, the damage to the motor bearing is extremely great, will cause the axle accident.
10. After the rotor is dynamically balanced, the residual unbalance of the rotor has solidified on the rotor and will not change. The vibration of the motor itself will not change with the change of location and working conditions. The vibration problem can be handled at the user site. of.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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