1. Disconnect the motor from the load, test the motor empty, and check the vibration value.

　　2. Check the vibration value of the motor foot. According to the national standard GB10068-2006, the vibration value of the foot plate shall not be greater than 25% of the corresponding position of the bearing. If it exceeds this value, the motor foundation is not a rigid foundation.

　　3. If there is only one or two diagonal vibrations exceeding the standard of four feet, loosen the anchor bolts, the vibration will be qualified, indicating that the foot pads are not solid enough, and the anchor bolts will cause the machine base to deform and vibrate after tightening. Cushion the feet firmly, re-align them, and tighten the bolts of the machine feet.

　　4. Fully tighten the four anchor bolts on the foundation. The vibration value of the motor still exceeds the standard. At this time, check whether the coupling on the shaft extension is level with the shaft shoulder. If it is not flat, it is caused by the extra key on the shaft extension. Exciting force will cause the motor's horizontal vibration to exceed the standard.

　　In this case, the vibration value will not exceed too much, and the vibration value can often decrease after docking with the host. The user should be persuaded to use it. The two-pole motor is installed in the shaft extension keyway according to GB10068-2006 in the half key during the factory test.The extra keys will not increase the excitation force.If you need to deal with it, just cut off the extra keys to make them longer.

　　5. If the air test vibration of the motor does not exceed the standard, and the load vibration exceeds the standard, there are two reasons: one is that the alignment deviation is large;

　　The other is that the residual unbalance of the rotating parts (rotor) of the main engine and the residual unbalance of the motor rotor overlap in phase. After the docking, the residual unbalance of the entire shaft system at the same position is large, and the generated vibration force is large, causing vibration .At this time, you can disengage the coupling, rotate either of the two couplings by 180°C, and then dock the test machine, the vibration will decrease.

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

　　7. The motor vibration of the sliding bearing is related to the assembly quality of the bearing bush. Check whether the bearing bush has high points, whether the bearing bush has enough oil, the bearing bush tightness, the bearing bush clearance, and the magnetic center line are suitable.

　　8. Under normal circumstances, the cause of motor vibration can be simply judged from the vibration values ​​in three directions. The horizontal vibration is large, the rotor is unbalanced; the vertical vibration is large, and the installation foundation is not flat; the axial vibration is large, and the bearing assembly is large. low quality.

　　This is just a simple judgment. It is necessary to find the true cause of the vibration based on the site conditions and the above-mentioned factors.