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Electrically Excited Synchronous Machine

Schaeffler's Electrically Excited Synchronous Machine (EESM)

Innovation in cooling and rotor power supply
Electrically excited synchronous machine (EESM) are free ofrare earth magnet and therefore minimize cost and supply chainrisks along with an optimized CO2-footprint. Schaeffler EESMdesign solutions include a dedicated rotor cooling system,enabling high performance and cycle efficiency, high speedcompatibility and a space neutral, touchless rotor power-supply.


  • High efficiency at WLTC and high way driving
  • High power density
  • Innovative rotor cooling enables high torques and efficiency
  • Minimized cost and supply chain risk, increasedsustainability by optimized CO2-footprint
  • Universally applicable
  • Space neutral rotor power supply


  • Adaptable rotor field
  • High slot fill factor due to optimized needle winding process
  • Effective rotor cooling due to slot cooler close to thewinding
  • No rare earth magnets
  • Scalable design
  • High integrated, non-contract rotor power supply
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