Bearings are damaged. There is foreign object in the motor. Scraping resulting from rotor/stator eccentricity. Phase deficient or lack of balance in the  three phase currents. Strong harmonic current. Looseness of structural fasteners.

  1. Bearings are damaged.
  2. There is foreign object in the motor.
  3. Scraping resulting from rotor/stator eccentricity.
  4. Phase deficient or lack of balance in the  three phase currents.
  5. Strong harmonic current.
  6. Looseness of structural fasteners.
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