EA4 - ReMoS

Effective reluctance machine for emission-free mobility without rare earths

In the ReMoS project, a novel concept was researched to increase the power density and efficiency of the SRM (Synchronous Reluctance Machine). This could make the SRM an alternative for traction applications to electrical machines using rare earths, the use of which is extremely questionable ecologically and politically.

ReMoS addressed three disciplines with innovative solutions: Thermal, Mechanical Strength, Magnetic Flux. The use of internal slot cooling should increase current density by up to 50% compared to conventional motors (BMW i3). Manufacturing the rotor using a novel approach of hybrid metal-plastic construction was expected to provide increased rotor strength with magnetic optimization, resulting in a torque increase of 10% to 20% over conventional SRM rotors. The introduction of variable magnets (without rare earths) was expected to dynamically adjust the machine’s efficiencyefficiency map during operation. An intelligent magnetization strategy optimized and shifted the high-efficiency region in the torque-speed map to meet the current requirements in the WLTP cycle, as well as on the road.

The result of the combination of these three approaches and their interdisciplinary research was a first solution for the mobility of the future without rare earths.

Key data

Research Field

Mobility Technologies


01.04.2020 until 30.09.2021

Project participants


Marcel Noeller

Research Coordinator "Mobility Technologies"

+49 721 608 45636