BMWi joint project TOPMAGNET

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Topological optimization for energy-efficient vehicle propulsion with improved magnetic material utilization

Until now, standardized magnet geometries have generally been used in the development of new electric drives. The arrangement of the magnets is carried out in certain, familiar patterns, such as a stacked structure or a magnet V arrangement. The design is thus based on experience-based intuitive patterns. In order to meet all requirements regarding performance, efficiency, acoustics and mechanical strength, complex iteration loops are necessary. In the arrangements known so far, the magnet material is not homogeneously utilized.

The aim of the joint project is to develop new, highly efficient rotor topologies for electric drive machines. By means of innovative numerical optimization methods, highly efficient magnet-iron-air distributions are to be identified which exhibit high performance, good acoustic behavior and high mechanical strength with low material input. For the appropriate evaluation of these novel rotor layouts, a tool chain shall be developed to compute the machine behavior holistically. In order to be able to use new irregular magnet geometries, the current manufacturing processes have to be further developed. A prototype test will be carried out to validate the process.


01.06.2016 - 31.05.2019

Project partners:

  • Volkswagen AG
  • MS-Schramberg Sinter GmbH & Co. KG
  • University of Kassel, Department of Vehicle Systems and Fundamentals of Electrical Engineering    

Sponsored by:

Federal Ministry
for Economics
and Technology

Based on a resolution
of the German Bundestag