Numerical calculation of 3D eddy current fields in transverse flux machines with time stepping procedures

Presents the calculation of the induced eddy currents in the conducting parts of transverse flux machines. Compared to conventional machines the transverse flux machine has a bigger torque, both with respect to volume and weight. For this reason, it is especially suited for direct drive applications in electric vehicles and railways. The main focus in this paper is the investigation of the different loss mechanisms caused by the sinusoidal stator current and the movement of the permanent magnet excited rotor. A 3D FEM solver with a \over right arrow A−\over right arrow A, \over right arrow T potential formulation is used in combination with edge elements. The time stepping procedure, with special focus on the displacement between stator and rotor mesh for the velocity effect, is explained in detail. The eddy current density distribution in the different parts of the machine is shown.