Electric planet motor - highly efficient & lightweight at reduced cost

  • increased power density – up to 50% more power than conventional drives
  • highest energy efficiency over the entire range of application
  • extremely simple, cost-effective, and smart design
  • very compact and flat design possible
  • electric motor with multirotor structure (a stator with four/ six/ eight/ ... rotors)
  • rotors are mechanically coupled via an integrated gear unit – which becomes an integrated part of the motor
  • with four rotors: twice the power of a conventional machine with the same rotor cross-sectional area
  • at the same time less material required for the stator
  • possible as permanent magnet- or reluctance-motor (without rare earth metals)
  • sensorless control possible by means of INFORM® control and thus failsafe and with even reduced volume
  • failure safety due to elimination of sensors
  • enhanced efficiency at lower production cost
  • all electric contacts and power electronics can be placed simply at front side, opposite of output side
  • manufacturing with a high degree of automatization possible – and thus further significant cost reduction
  • prototype with integrated 1:10 reduction shows: electrical behaviour at terminals of the planet motor corresponds to a classic three-phase machine, controlled by a conventional inverter
  • 30 years experience in the design of sensorless synchronous motors
  • based on the reliable INFORM® control, used by tens of thousands of systems on the market – e.g. in medical and aerospace technology

Innovation level:

  • world novelty – worldwide first presentation of a planet motor with integrated power electronics
  • patent protection

Target groups and applications:

  • e-mobility
  • aerospace technology
  • construction machinery and heavy equipment
  • machine tools and production machines
  • emergency units of various sorts
  • drum drives
  • robot joint drives


English, opens a file in a new window  ||  German, opens a file in a new window


planetary motor – front and back (image: © by TU Wien)


planetary motor (image: © by TU Wien)

Prof. Dr. Manfred Schrödl

© Foto Wilke

Portraitfoto – Prof. Dr. Manfred Schrödl

Prof. Dr. Manfred Schrödl (Abdruck honorarfrei, Bild: © Foto Wilke)

Automation, Motion & Drives – Hall 11, Stand B66

An red paper plane flying up to the headline "Automation, Motion & Drives – Hall 11, Stand B66".