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       1. Abnormal voice.

       Possible reasons:

       1, the stator winding connection error, partial short circuit or grounding, resulting in three-phase current imbalance caused noise.

       2, bearing internal foreign bodies or serious lack of lubricating oil.

       Methods of treatment:

       1, check separately, suit the remedy to the case.

       2. After cleaning the bearing, replace the new lubricating oil as the 1/2-1/3 of the bearing chamber.

       2. Abnormal vibration of motor

       Possible reasons:

       1, the motor installation foundation is uneven.

       2, the motor rotor is unbalanced.

       3, pulley or coupling is not balanced.

       4. The shaft head of the rotating shaft is bent or the belt pulley is eccentricity.

       5, motor fan imbalance.

       Methods of treatment:

       1. Lay the motor base flat and fix the time after finding the level.

       2, rotor static balance or dynamic balance.

       3, carry out the balance of pulley or coupling.

       4, straighten the rotating shaft, and put the belt wheel in the right direction.

       5. Calm the fan.