Design and Optimization of a Dual-Rotor and Flat-Type-Stator Transverse Flux Machine

The development and application of transverse flux machines (TFMs) with permanent magnet (PM) excitation have received more and more attention in recent years because of the high torque density at low rotating speed applications. This paper proposes a novel topology structure of TFM with dual-rotor and flat-type-stator (DRFTS-TFM). One of the advantages of the proposed structure is that the sandwiched design greatly reduces the manufacturing and assembling difficulties. Another advantage is that the number of the armature phase can be easily changed by converting the mechanical angle of the stator. To investigate the best electromagnetic torque performance of the machine, the multi-objective particle swarm optimization (MOPSO) algorithm is adapted and validated by the finite element method (FEM). The corresponding electromagnetic performances in different conditions are analyzed.