Causes
a) Defects at bearing or shaft.
b) Wrongalignment
c) Problems in driven machinery
d) Vibration
Results
a) Rubbing of stator and rotor leading to snort-circuit
b) Roasting of winding - overload
Prevention
a) Perform regular inspection of motor, drive system and driven machine.
b) Ensure thermal overload relay is working .
c) Install motor away from vibrating areas.
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