Investigation of the Skewing of the slots in Permanent Magnet Synchronous Machines

This paper presents a study of slot skewing in a permanent magnet synchronous motor. Several cases are considered where the rotor is divided into multiple segments. The segmentation is done in the area between two stator slots. Three segmentations were performed in order to obtain more accurate results while saving computing time. A 2D model based on finite element method was used instead of a 3D one due to the requirement of low computing time. The accuracy of the solution is not significantly affected due to the selection of a 2D model. Different types of segmentations are used to evaluate the maximum value of the main harmonic of electromotive force and air-gap torque. The studies were performed for three different values of current density.