Vibration analysis

Vibration analysis

A vibration analysis on an electric motor shows significant
radial vibrations at 1x, 2x, 3x, 4x the running speed of the motor.
A particularly predominant peak shows near 12,000 cpm. If the motor
has 4 rotor bars and runs at 2940rpm what would you suspect the
problem to be and how would you confirm your suspicions?

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