Design of a transverse flux permanent magnet excited machine as a near-wheel motor for the use in electric vehicles

This paper presents the requirements on a city car and how they have been derived. In addition, the design of a transverse flux permanent magnet excited machine for the use in an electric vehicle is introduced. The drive concept of the city car bases on two near-wheel motors. Transverse flux machines are capable for direct drive applications because of their very high torque density. Their speed range matches the required speed range of electric vehicles´ wheels. The paper deals with the design and the further development of a lamination concept for a transverse flux permanent magnet excited machine, whereby the designed form closure leads to a improved mechanical clamping which allows higher tolerances of the laminated steel sheets. The design is optimized considering torque density and the applicability to electric vehicles based on a finite element method simulation.