Design Optimization with Outer Rotor Interior Permanent Magnet Synchronous Motor with Hybird Permanent Magnet

摘要

Aiming to reduce the usage of rare-earth permanent magnet (PM), this paper proposes a novel outer rotor interior permanent magnet synchronous motor (IPMSM) with two types of PM material: ferrite and earth PM. The proposed motor has an outer rotor structure with two-layer crescent barriers. The ferrite PMs are filled into the middle of the crescent barriers with a thicker thickness while the rare-earth PMs are filled into the bilateral barriers with a thinner thickness. Comparisons have been investigated with the basic outer rotor IPMSMs, which only have one type of PM. Results indicate that the proposed hybrid structure can effectively utilize the reluctance torque and reduce almost half the usage of rare-earth PM while having a competitive performance.