Unbalance in the Rotor of the Motor

The rotors of all motors are dynamically balanced to a high degree of precision.

Therefore the machine should not vibrate when run uncoupled. If the shaft fitments and driven apparatus are themselves balanced and the alignment and coupling are properly done, the system should also not vibrate on normal operation. If, however, undue vibration does occur, determine whether the motor or the driven apparatus is responsible for this. If it is the motor, then isolate the cause from the following possibilities.

1.Improper alignment and coupling.
2.Loose foundation bolts or other fasteners.
3.Weak or resonant support structure of foundation.
4.Inter turn shot circuit in windings.
5.Unbalance in shaft fitment (coupling, pulley, etc.