Location of bearings in MV motor 5

[edison123]

Recently, I got a 3.3 KV, 2000 HP, 990 RPM motor for a rotor rewind. It has a ball bearing (6234) on the Drive End (DE) and a roller bearing (NU 234) on the slipring end (ODE).

First time, I am seeing a roller bearing on the ODE and a ball bearing on the DE.

When asked, the OEM says the arrangement is correct.

Any views on this ? Anyone else has seen such a bearing set-up ?

 

[edison123]

Thx stardelta. That makes it three confirming the odd bearing set up. So, I will let the sleeping dogs lie.

 

[powerjunx]

Ed, aoladle best explains the bearing configuration effect on motor operation.

Needless to explain further about our consultant's view since they both had similar reason.


So, let your dog sleep!

 

[edison123]

Thx fbycil

OK. Two more votes against me.

I feel like Dubya right now.

 

[181273]

hello, I´m new on this thread, and I´ll like to say something:
- First I got an hydro unit generator asincronous one, with pelton turbine that got the next configuration:

- Drive end: 1 roller bearing
1 angular bearing.
-Non drive end:
1 roller bearing

I think the angular bearing is only to support the axial effort, cause the roller bearing have no posibilities of support it.
And about the idea of the perfect alignement machine, I never found one... When do you say the machine got a good alignement, I´m not talking of zero.
And about the idea that in a perfect alignement machine there`s not radial forces, If you use an pelton turbine with one injector, you loose the pair of oposite forces.

Cheers to everybody and salud from sunny spain