Design, Analysis, and Performance Comparison of a Permanent Magnet Synchronous Machine With Multiple Excitation-Drive Ports

Due to the inherent properties of permanent magnet materials, the magnetic flux regulation of permanent magnet synchronous machines (PMSMs) is challenging, which always causes low flux regulation efficiency, high demagnetization risk of permanent magnets, narrow constant power range, etc. This article investigates, designs, and implements a permanent magnet synchronous machine with multiple excitation-drive ports (MEDP-PMSM). Compared to the conventional PMSM, MEDP-PMSM provides an additional dual-axial magnetic circuit for the permanent magnet flux, which will decrease the flux regulation difficulty. Moreover, two armature windings are installed on the axial magnetic circuits, utilizing the magnetic flux leakage to generate torque, thereby improving the operating efficiency (flux-weakening state) and permanent magnet flux utilization. The simulation and prototype testing of a 10 kW MEDP-PMSM have been successfully developed. The results show that the flux regulation performance of MEDP-PMSM is satisfactory, indicating promising application prospects in fields such as electric vehicles and wind power generators, etc.