49 - PVD3627-August 2011
3.4. Bearings
The bearings are greased for life so that there is no need to lubricate them.
The statistic bearings life is limited from 6000h up to 10000h depending on the way
there are assembled and used, it is recommended to implement a vibratory analysis
every 3000h or to change it once the predicted lifetime is reached.
This period is indicative and has to be considered with the load and speed limits
taken into account for the bearings calculation.
Depending on the maximum speed, the loads and the needed lifetime, those high-
speed motors can be equipped with different kind of bearings: steel ball bearings,
hybrid ball bearings (ceramic balls with a synthetic cage) or Xlife bearings (ceramic
balls with rings made with high performance iron).
Max possible speed tab depending on bearing type
STEEL STRAIGHT BEARINGS
HYBRID BEARINGS
X LIFE BEARINGS
Motor
Max speed
Radial
Axial
Max speed
Radial
Axial
Max speed
Radial
Axial
load
load
load
load
load
load
rpm
N
N
rpm
N
N
rpm
N
N
MGV420
26000
100
30
33000
100
30
45000
100
20
MGV430
26000
100
30
33000
100
30
45000
100
20
MGV620
18500
320
80
25000
320
80
30000
240
60
MGV635
18500
320
80
25000
320
80
30000
240
60
MGV820
14300
400
100
18000
400
100
24000
400
100
MGV840
14300
400
100
18000
400
100
24000
400
100
MGV930
11700
500
120
16000
700
160
20000
500
120
MGV950
11700
500
120
16000
700
160
20000
500
120
MGV970
-
-
-
-
-
-
12000
200
500
MGVA30
9200
700
120
12000
700
120
-
-
-
MGVA50
9200
700
120
12000
700
120
-
-
-
Possible speed and load depending on bearing type
Other limitations can come from the winding or the drive
(cf: §3.1.4-Drive selection)