Bearing Fluting - recomendations, causes
Bearing Fluting - recomendations, causes
(OP)
Our customer has a 250 hp 460v drive running a 250 hp motor driving a fan at approx 63-68hz. After 6 months, pulled the motor and noticed fluting on the ODE bearing. The mill has had other motors on drives with fluting problems.
For this mill, on large hp motors (above 200 hp), should the standard be insulated ODE bearing and shaft grounding brush? Could there be a issue with the electronic grid in the mill? Could running above 60 hz cause the fluting? Is there any way to predict fluting?
Thanks for your comments.
For this mill, on large hp motors (above 200 hp), should the standard be insulated ODE bearing and shaft grounding brush? Could there be a issue with the electronic grid in the mill? Could running above 60 hz cause the fluting? Is there any way to predict fluting?
Thanks for your comments.





RE: Bearing Fluting - recomendations, causes
RE: Bearing Fluting - recomendations, causes
There are lots of different proposals around for fixing the problem but, for me, the only economical, almost foolproof method is a shaft grounding ring.
These are made by Parker Corp (the hydraulics people) and Aegis, a division of ITW in Mechanics Falls Maine. Both are good products and are simple to install.
RE: Bearing Fluting - recomendations, causes
RE: Bearing Fluting - recomendations, causes
RE: Bearing Fluting - recomendations, causes
RE: Bearing Fluting - recomendations, causes
The AEGIS ring usually does both the cleaning and the conducting work. Wear is also usually not a problem.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Bearing Fluting - recomendations, causes
Attached find an interesting study on VFDs and bearing currents
http://www.rema.uk.com/pdfs/Report%20No%202.pdf