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We are seeking highly durable and efficient bearing design for high speed rotors (30-50krpm) in electrical machines.


Inconsistency of load capacity and speed of ball bearings can cause problems in high speed rotors. An example of existing limitations is a ball bearing ‘61808’ (inner diameter 40mm, outer diameter 52mm, width 7mm) has a limiting speed of 14,000 rpm). Novel bearing designs could provide improvements to performance at higher speeds.


  • High Durability (1000 hours at nominal speed / total lifetime 3000h)
  • Compact design
  • Low drag losses, high efficiency (>99%)
  • Cost efficient
  • weight (<0.04 kg)
  • Low initial breakaway torque (<0.1 Nm)
  • axial load: 200N (helical gearing)
  • axial load:1200N for 30h
  • radial load: 0N (neutral in operational condition)
  • radial load (short): <100N (maneuvering)
  • Oil or grease lubrication for ball bearings
  • Operational temperature range: -40°C to 150°C
  • Approximate cost – <6EU at 300,000 pieces per year over 5 years.


Possible solution areas:

All areas considered.

Desired outcome of the solution:

Novel ball bearing design capable of operating at high speeds.

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