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Increase Of Power Density

Electric drives compete with mechanical and hydraulic drive systems with slower transient response but higher force density. Therefore one important goal for electric drive concerns increasing their power density. We currently pursue several approaches:

  • Use of new materials like permanent magnets, soft magnetic composites allowing three dimensional flux paths, and alloys with extreme remanence contribute to high force density.
  • The development of low loss magnetic materials permits higher speeds and thus a reduction of size without loss in power.
  • The improvement of thermal behavior by use of liquid cooling and high temperature insulation also increases force density.
  • An integration of several functions in one compact design (e. g. motor and power electronics in one common housing) omits passive volume and reduces cable length.


Current Projects

  • High speed induction motor drive (30 kW, 30,000 rpm) using different soft magnetic alloys (Si-Fe, Co-Fe)
  • Switched reluctance drive for an aircraft starter-alternator with 50,000 rpm
  • High speed starter alternator for automotive applications

Recent Projects

  • Induction motor with liquid cooling of the rotor
  • Motor integrated ring converter for HEV applications


Motor Integrated Ring Inverter For HEV
Motorintegrierter Ringumrichter für Hybridfahrzeuge
High speed induction motor drive in back-to-back-test (20 kW, 30,000 rpm) with different stack alloys (SiFe, CoFe)
Hochdrehende Asynchronmotoren im Back-to-back-Test (20 kW, 30.000 U/min) mit verschiedene Blechqualitäten (SiFe, CoFe)

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