Dec 21, 2011 Dear All, We experienced Slip ring failure last Dec 14,2011. We gathered some information prior to the failure. The 400kW motor drives an equipment called Ball Mill used in grinding oresslag with a capacity of 25Tonshr. Frequent Slipring Burning of 400kw Induction Motor 12192011 236 AM.
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Read MoreDec 19, 2011 I am currently assign to investigate the frequent burning of Ball Mill motor slip ring. Induction Motor Specification 400KW output, 870rpm 3300V, 60hz, 8 poles This motor drives an equipment called Ball Mill. My initial finding is that, maybe the motor experienced overloading.
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Read MoreJun 25, 2011 Did you consider the slip ring energy recovery ? VVVF exists for these size motors but the cost benifit ratio you have to consider. Afterall this size of ball mills are not the one that are frequently started and stopped. once started it is likely to run for quite a few months if not years.
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