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Sinbad Motor CO., Ltd. teaches you how to deal with motor resonance
- Jan 14, 2019 -

Motor resonance? The following motor manufacturer Sinbad Motor will share with you how to deal with this problem.

1. Disconnect the motor from the load, test the motor in a space and check the vibration value.

2. Check the vibration value of the motor foot. According to the national standard GB10068-2006, 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.

3. If there is only one or four diagonal vibrations of the four feet, the loosening of the anchor bolts will cause the vibration to pass, indicating that the underfoot is not properly ground, and the anchor bolts are tightened to cause vibration of the base. The foot pads are solid, realign the centering and tighten the anchor bolts.

4. The four anchor bolts on the foundation are fully tightened, and the vibration value of the motor still exceeds 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. In this case, the vibration value is not too much, and the vibration value can be lowered after docking with the host. It should be convinced to use the user. The two-pole motor is installed in the semi-key in the shaft extension keyway according to GB10068--2006 in the factory test. Excess keys will not add extra excitability.

5. If the vibration test of the motor is not exceeded, the vibration of the load exceeds the standard. There are two reasons: one is that the deviation is large; the other is the residual unbalance of the rotating part (rotor) of the main engine and the residual unbalance of the rotor of the motor. The phase overlaps, and the residual unbalance of the entire shaft system at the same position after docking is large, and the generated exciting vibration force causes vibration. At this time, the coupling can be disengaged, and any one of the two couplings can be rotated by 180 ° C, and then the vibration of the test machine can be lowered.

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

7. Due to the poor rigidity of the rotor of the two-maximum power motor, it will be deformed without using the rotor for a long time, and may vibrate when it is rotated. This is the reason for the poor storage of the motor. Under normal circumstances, the two-pole motor is stored. It is necessary to drive the motor every 15 days, and at least 8 turns per turn.

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. We think that under normal circumstances, the vibration of the motor can be easily judged from the vibration value in three directions, the horizontal vibration is large, the rotor is unbalanced; the vertical vibration is large, the installation foundation is not flat; the axial vibration is large, the bearing assembly low quality. This is just a simple judgment. According to the situation on the spot, combined with the factors mentioned above, comprehensive consideration should be made to find the real cause of the vibration.

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, and the vibration problem can be handled at the user site. Under normal circumstances, the maintenance motor does not need to perform dynamic balance check on the motor. Except for the special case, such as flexible foundation and rotor deformation, it must be on-site dynamic balance or return to factory.


The above is the sharing and content of the motor manufacturer Sinbad Motor, hoping to help friends in need.

  • Building 25, Feipeng Industry Park, Fumin Industry Zone, Pinghu Town, Longgang District, Shenzhen City, China.

  • wanling@sinbad-motor.com

  • +86-755-85215266

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