Reduction of unbalanced magnetic force in 2-pole 3-slot permanent magnet machine

Recently, research interests have been paid on 2-pole 3-slot permanent magnet (PM) machines due to their simple rotor and stator combination for high-speed applications in the automotive industry. However, it is widely recognized that, due to the diametrically asymmetric stator structure, an unbalanced magnetic force occurs in both no-load and load conditions. In this presentation, the investigation has been focused on the behaviour of the unbalanced magnetic force in the no-load condition. Methods for the reduction of the no-load unbalanced magnetic force have been explored. Various design parameters have been considered and the investigation has been carried out by 2D finite-element (FE) analyses.