IMPACT OF MAGNETIC COUPLING IN TRANSVERSE FLUX PERMANENT MAGNET MACHINE FOR WIND POWER APPLICATION

This paper is devoted to three dimensional (3D) finite element method (FEM) based examination of the interphase magnetic coupling in a three-phase transverse flux machine (TFM). The comprehensive analysis shows that the axially stacked phases are magnetically coupled, which leads to an unbalanced contribution of torque from each phase and therefore a reduced value of resulting three-phase torque. This issue can be addressed by introducing an axial air gap in the rotor back-iron between the phase modules or selecting a proper magnet arrangement. Following a discussion of different magnet arrangements, it is found that the optimal combination is dependent on the flux patterns produced by the armature reaction and the magnets.