10.8 Bearing lifetime
The bearing lifetime for MSK-ATEX motors for operation within the specified
limits for radial and axial load and for ambient conditions is:
L
10h
= 30000 h (calculation acc. to ISO 281, edition 12/1990)
Different loads may have the following effects:
● Premature failure of the bearing due to increased wear or mechanical
damage.
● Reduction of the grease lifetime leads to premature failure of the bear‐
ing.
Bearing lifetime with increased ra‐
dial force
Calculation of mechanical bearing lifetime at increased radial force:
L
10h
Bearing service life (according to ISO 281, Version 12/1990)
F
radial
Determined allowed radial force in N (newton)
F
radial_act
Actually acting radial force in N (newton)
Fig. 10-10: Calculation of bearing lifetime L10h at increased radial force:
The actually acting radial force F
radial_act
may never be higher than
the maximum allowed radial force F
radial_max
.
DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P Bosch Rexroth AG 129/175
Synchronous Servomotors MSK For Potentially Explosive Areas
Operating conditions and application notes
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