Study and comparison of several permanent-magnet exited rotor types
An increasing ecological awareness and the shortage of fossil-fuel resources are strong incentives to develop more efficient vehicles with low energy consumption. The hybrid electric vehicle (HEV) and the full electric vehicle (EV) are promising concepts in this regard. Due to the limited available space and the high demands in power density and overall efficiency, the permanent magnet synchronous machine (PMSM) is the most suitable machine type for this application. Several permanent-magnet excited rotor types are studied regarding their applicability in EVs and HEVs: a rotor with surface mounted magnets (SMPMSM), a rotor with inset surface magnets (SI-PMSM), with internal (buried) magnets (I-PMSM), with v-shaped internal magnets (VI-PMSM) and a rotor with radial arranged internal magnets (RI-PMSM).