If a machine
that has been correctly aligned vibrates, the couse may be balance. This is
usually due to a badly balanced coupling half or pulley. If the machine is to give trouble – free
service, the coupling half or pulley must be properly balanced before it is
fitted.
Vibrations of the magnetic origin may arise as
a consequence of the fact that the air gap is not straight or because of an open or short circuit in the
windings. Vibration of this ype cannot be reduced by rebalancing the rotor.
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