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Problem with Brushes chipping on large SAG Mill Motor 2.3 MW

Problem with Brushes chipping on large SAG Mill Motor 2.3 MW

Problem with Brushes chipping on large SAG Mill Motor 2.3 MW

(OP)
Folks,
Can anyone offer an opinion on the following issue:
We have a 2.3MW slip ring motor WRIM on the SAG Mill in the process plant. The issue we have is that the leading edge on the brushes on only ONE of the rings is chipping (7 brushes per ring). We have had this issue for 6/9 mths now, mill has been running 10 years with no problem. Have tested all earthing, have got the brushes tested, changed out the holders with the holders from the other rings - still the issue remains. There is an inspection window and no signs of arching at the contact point. Have checked the ring for signs of a crack or movement and nothing appprent
 

RE: Problem with Brushes chipping on large SAG Mill Motor 2.3 MW

Could you post some pics of the sliprings and the chipped brushes ?

Muthu
www.edison.co.in

RE: Problem with Brushes chipping on large SAG Mill Motor 2.3 MW

You have proved by a process of eleimination that the probability that brushes or brush holders are the cause is very low. Check the slip ring for flaws or runout.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Problem with Brushes chipping on large SAG Mill Motor 2.3 MW

I would suspect some high point in the slipring grooves is causing the chippping. Can we you machine it situ ?

Muthu
www.edison.co.in

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