Electric machine with grease relubricable bearing option
The expression of L
10
in bearing lifetime information is a standard way of expressing the lifetime and
means the time period at the end of which 90% of the bearings are still reliably working. Grease
lubricated bearings (+BHS option) need regular greasing. This is due to the limited lubricant (grease)
lifetime in operation conditions, and is shorter time period than the actual bearing lifetime.
Greased for life (BGL) bearing option
Greased for life bearings (BGL option) do not need relubrication during their lifetime.
The lifetime of the bearing depends on the mounting position of the electric machine. The lifetime
depends also on the rotation speed of the electric machine and the temperature of the bearing. The
bearing lifetime is a combination of both mechanical bearing lifetime and bearing grease lifetime, and is
shown in the figures below, both for horizontal and vertical mounting.
Bearing lifetime with greased for life bearings, horizontal mounting
User Guide
EM-PMI300-T310
Maintenance
54 |
©
Danfoss | April 2023
BC265858156812en-000202
