Permanent magnet vernier machines (PMVMs) are attractive candidates for direct-drive applications due to their high torque density. However, they suffer from low power factor owing to the large harmonic leakage inductance caused by armature no-working harmonics. This article proposes a high power factor PMVM with segmented stator. Benefited from segmented-stator structure, the additional magnetomotive force (MMF) has been introduced, which can not only weaken the low-order armature no-working harmonics and corresponding harmonic leakages but also strengthen armature working magnetic field by the cooperation of multiple working harmonics. As a result, both the high power factor and average torque can be achieved. Furthermore, the performances of the proposed PMVM have been comprehensively analyzed and compared with regular PM synchronous machine (PMSM) and regular PMVM. It indicates that compared to the regular PMVM, the power factor of the proposed PMVM at current density 5 A/mm 2 can be improved from 0.85 to 0.96, and torque density can be enhanced from 15.4 to 16.7 Nm/L, respectively. Finally, a prototype with six-segmented-stator 13-pole-pair PM rotor is manufactured and tested, where experimental results match well with finite element analysis (FEA), which verifies the superiorities of the proposed PMVM.
A High Power Factor PM Vernier Machine With Segmented Stator
IEEE Transactions on Transportation Electrification ; 10 , 4 ; 9294-9303
2024-12-01
3541624 byte
Article (Journal)
Electronic Resource
English