Field weakening performance of a concentrated wound PM machine with rotor and magnet geometry variation

Concentrated non-overlapping windings (CNW) have recently gained popularity due to key attributes of reduced machine axial length and simplified manufacturing. These attributes make it relatively more suitable for traction applications where reduced size and cost plays a vital role. In traction applications, good field weakening performance is desired. In this paper, the field weakening performance of the SPM rotor is compared to two different IPM rotor designs. Magnet eddy current loss with sintered, segmented and bonded magnets in SPM and IPM machines are also compared. Finite element analysis with Flux2D is used for this comparison due to its ability to handle complex calculations with non-linear material properties and precise geometry variations.