Cookies on the SKF website

SKF uses cookies on our websites to align the information shown as closely as possible to our visitors’ preferences, such as country and language choices. Will you accept SKF cookies?

SKF hybrid bearings for high speed electric motors

Hybrid

SKF has selected a range of grease-lubricated single row deep groove ball bearings with ceramic balls that are especially suitable for:

  • 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 bearings

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.
SKF logo