Bearing Failure/Elec Arcing

[flacrkr]

I am seeing what I beleive to be a trend of bearing failures due to elec. arcing in some of our VFD driven motors. Does anyone have a link to some related articles so I could present a report to management to upgrade brg' types during rebuild?

 

[hacksaw]

Hydrocarbon Processsing has articles on this as I recall
you have to ground the shaft

 

[micjk]

Do a web search for electrical discharge machining. Check Siemans website, also seems like I read something on Reliance's website. EDM is probably going to get you plenty of info.
Regards

Roy Gariepy
Maintenance and Reliability Dept.
Dorlastan Fibers LLC.
Goose Creek, South Carolina USA

 

[hacksaw]

check the eng-tips group..

 

[vanstoja]

See Thread237-102205, Thread237-18455, Thread237-30937 in this forum. There are hundreds of other related threads brought up by a search of "motor shaft current" or "shaft grounding".

 

[micjk]

You can also search for the tech article "The Effects of PWM Voltage Source Inverters on the Mechanical Performance of Rolling Bearings" by Busse, Erdman, Kerkman, Schlegel and Skibinski. I found it to be very interesting.
Regards,

Roy Gariepy
Maintenance and Reliability Dept.
Dorlastan Fibers LLC.
Goose Creek, South Carolina USA