Motor bearings for vertical position 1

[Feg]

Hi Guys,

I am looking for an opinion on the following motor in the V1 shaft down position. Am I working this out ok or is there more to be considered.

Motor 132kw 4pl V1 - 132*9550/1450=869Nm

Vee Pulley approx 46kg 400mm dia, radial force 2000x869x2/400=8690 newtons
Axial force assuming 135kg for rotor 135+46*9.81=1784 newtons

From Motor catalogue roller bearing NU319 on drive end rated at 14700 newtons ball bearing at non drive end is 6319
The rotor has circlips at either end behind the bearings and it has grease plates either end.
The application is a mixer driven by 6 groove belts.

Your comments would be welcome as i am pretty sure the above is not good enough.

 

[edison123]

135 kg for a 132 kw, 4 pole rotor seems too low. You probably need a matched pair of angular contact ball bearings on the top.

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

 

[Feg]

Thanks Edison123,

Your right it probably is a bit low, I am waiting to get this info from the motor shop I was going on a hunch. Do you mean the two bearings apposing one another at the non drive end ? would it need two bearings as the force is in one direction I don't think there would be space for the two bearings it a std 315 frame IEC Motor.

Thanks

 

[oftenlost]

this arrangement is fairly common and the 319 at the top should be sufficient to handle the rotor plus sheave weight. I would consider rerouting the grease passage on the DE bearing to cause the grease to be applied to the bearing cap instead of the endbell below the bearing. I would also make sure that there is some method of holding the core iron on the shaft. A weld bead on the DE shaft at the core iron should prevent the rotor core from falling if you get unusual heating.

 

[edison123]

Take a look at

http://www.skf.com/portal/skf/home/products?maincatalogue=1&lang=en&newlink=1_3_9

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

 

[aolalde]

The expected bearing life in years or (millions of revolutions) should be calculated, based on the equivalent bearing loads, speed and bearing dynamic load (C). You will need a good bearing manual like the SKF and follow the calculation instructions or better consult your bearing provider to get that calculation.