A Novel High Power Density Permanent-Magnet Synchronous Machine With Wide Speed Range

摘要

In this article, a novel high power density permanent-magnet synchronous machine (HPDPMSM) is proposed. The flux-weakening ability and efficiency at high speed are improved by the proposed bypass-ribs added in the flux barriers. The working principle of the bypass-rib is analyzed, and the effects of the main parameters of the bypass-rib on the characteristics are investigated. The performances of the proposed HPDPMSM are analyzed and compared with that of the HPDPMSM without bypass-rib on 2-D finite-element analysis (FEA), including the cogging torque, output torque, constant-power speed range, losses, and efficiency. The results show that both HPDPMSMs generate comparable output torque and have the same maximum output power, while the proposed HPDPMSM has lower torque ripple, wider constant-power operation range, and higher efficiency in the flux-weakening operation region.