strange specification for a ABB asyncronous generator

[181273]

Yesterday I was at my office and I see a strange specification from a customer of me, about a ABB asyncronous generator, squirrel cage, 600 kw 1512 rpm, the application is a wind farm... it´s concerned to the bearings, two ball bearings, but the strange thing is he said he wants in the drive end side a ball bearing of FAG company, and in the non drive end bearing (this is the free side) a bearing of SKF company, does anybody knows why this specifications, or if ís it some diference between the two bearings, we´re talking about a 6319 C3 bearing....
thank in advance and always wait for your good and intelligent answerss

 

[dpc]

Is one bearing insulated from ground, perhaps? Or maybe required to handle a high thrust load? I'm guessing they have a reason.

 

[181273]

no insulated bearing, the bearings seens to be the same kind... but differents factories.... and it´s for a wind farm and it´s supposed not to be high thrust load. and is a diference between the two bearing to support the thrust load???

 

[stevenal]

Evaluation? After operation and tear down they can compare two bearings that have experienced the same number of revolutions.

 

[JBinCA]

Stevenal, good thinking. I was going to go with the low tech option - I think they screwed up when copying and pasting an old spec.

 

[DaveScott]

Isn't the 6319 C3 bearing a locating type? One end should be locating, and the other end sould be non-locating to allow shaft growth etc. If the customer has specified locating types at both ends, then this will surely give problems.

 

[edison123]

Davescott

If both the bearings are locating type, then one of them will be free floating axially to allow thermal growth.


To the OP,

Yes, it is a strange spec that requires a clarification from the customer.

*Why a man thinks he outrun a chasing dog when it has twice as many legs?*

 

[181273]

hi, there to all the people from eng tips, the bearing are the two C3 type, and no special diferences between them.. and the drive end is a located one( fixed radial and axial).... and the non drive end is more free in order to let it grow cause of the heat.
I try to get a clarification from them.... take care, and if some of you think something about please make me know
best regards...