SKF hybrid bearings for high speed electric motors
- Air-turbine motors
- Electrical motors
- Pneumatic motors
Hybrid bearings have carbon-chromium steel rings and special grade Silicon Nitride rolling elements. The ceramic material silicon nitride is produced by a powder compacting process acting at high temperature (~1800°C) and high pressure (~200MPa). The SKF specified process creates a solid ceramic material without any porosity, and with good toughness.
This range of hybrid bearings offers a replacement to conventional all-steel grease-lubricated bearings in high speed Electric motors.
Improved service life can be achieved for hybrid bearings due to:
- Extended grease life
- Good performance in air-streams and condensation
- High wear resistance against particulate contamination (sand, pigments, abrasives, steel, iron oxides etc)
- Resistance to electric current
Centrifugal forces in bearing
SKF hybrid bearings can often be used at higher speeds than the standard speed ratings for grease-lubricated standard deep groove ball bearings given in the SKF General Catalogue. This is due to the lower density of silicon nitride compared to steel. The centrifugal force from a ceramic ball in a bearing is 40% of that of a steel ball at the same speed.
Higher centrifugal loads cause higher bearing temperatures.