A comparison of the transverse, axial and radial flux PM synchronous motors for electric vehicle

This paper presents the performance comparison among three different topologies of the permanent magnet synchronous machine, namely a transverse flux permanent magnet machine with flux concentration and claw pole structure, an axial flux machine with segmented armature torus structure and a conventional radial flux machine with embedded permanent magnets in the rotor. With the help of Finite Element Method, three electrical machines have been designed considering the required dimensions and permanent magnets mass. The complete results evaluation and comparisons are described in this paper. From the obtained results it can be concluded, the axial flux machine with segmented armature torus structure can be a competitive alternative compared with the conventional radial flux machine for applications with limited axial length, while the transverse flux machine is an attractive alternative for the high torque and low-speed applications due to its high pole number.