Motors for Cryogenic Applications

e+a Elektromaschinen und Antriebe AG has been supplying motor elements for operation in cryogenic pumps (2.5kW – 250kW) since 2013.

Design Challenges:

  • Electrical insulation and durability
  • Frictional losses when operating in liquids
  • Rotor sleeve design for permanent magnet retention


  • Operation of e+a rotors & stators immersed in liquid natural gas (LNG, -160 ° C) and liquid nitrogen (LN, -196 ° C)
  • Testing of different materials for operation in cryogenic liquids
  • New rotor manufacturing variant developed and successfully tested.
  • Evaluation of increased power density in cryogenic liquids

Based on experience gained in the LNG and LN markets, e+a is now taking the next steps to develop and manufacture motor elements for operation in liquid hydrogen (LH2, -253 ° C). Test results still pending.