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I have faced a problem with induction motor.1500 rpm induction motor driving the reciprocating compressor through the belt drive which is in service continously for one month. Slight noise observed and overall vibration is recorded as 2.0 mm per sec max peak is at 6000 rpm .from the beginning there will be a peak in motor spectrum at 84000 rpm probably it is rotor bar pass frequently. Suddenly abnormal noise is observed from motor.after opening it is observed that delivers bearing cage broken (number 319) .grease is observed in full black colour. Where as needed bearing is good and it's colour also good.
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