This paper aims to make further investigation on the detailed
mechanism of field weakening of IPMSM with segmented
PM. The flux density of air gap under demagnetizing armature
reaction field is analyzed, for both segmented and nonsegmented
IPMSM. The flux in iron bridges resulted with
permanent magnet alone at no-load and field weakening condition
is obtained using FPT, to find out why the air gap flux
could be weakened more effectively in segmented IPMSM.
Then, the influence of design variations of iron bridges on field
weakening is estimated. Finally, a novel opinion is proposed
to explain the improvement of flux weakening capability by
magnet segmentation.