A novel transverse ux permanent magnet generator for small-scale direct drive wind turbine application: Design and analysis

This study proposes a special topology of transvers ux permanent magnet generator, which benets from low Permanent Magnet (PM) costs due to use of cheap Ferrite PMs. In this structure, only one PM per phase is used to ensure easy manufacturing. Despite the above-mentioned advantages of the topology, it is subject to some disadvantages such as unbalanced voltage, high demagnetization risk of the PM, and high cogging torque. Aiming to solve these problems and maintaining the advantages of the topology, a new structure is proposed. The stator of this structure contains two series connected coils that eliminate all the even-order harmonics and balance the voltage waveform. This trick reduces the armature reaction as well as demagnetization of the PMs signigcantly. Moreover, the rotor teeth of the proposed structure are skewed, causing a signigcant reduction in cogging torque. The output results of the proposed structure are compared with those of the original one in terms of harmonic components, cogging torque profile, and PM demagnetisation.