Electromagnetic Performance Comparison between 12-Phase Switched Flux and Surface-Mounted PM Machines for Direct-Drive Wind Power Generation

Lingyun Shao, Wei Hua, Juliette Soulard, Zi Qiang Zhu, Zhongze Wu, Ming Cheng

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In this paper, the 12-phase switched flux (SF) permanent magnet (PM) (SFPM) machine and three surface-mounted PM (SPM) machines designed for direct-drive wind power generation are comparatively analyzed. Firstly, feasible stator-slot/rotor-pole combinations for symmetrical 12-phase winding layout are investigated for both machine topologies. Secondly, the key design parameters of the PM generators including the split ratio and stator teeth width ratio are optimized by finite element (FE) analysis, to achieve a high phase fundamental EMF per turn and a low cogging torque, both of which are desired by the direct-drive wind power generator. Thirdly, electromagnetic performances including air-gap field, cogging torque, static torque, inductance, output voltage and its regulation factor, output power and efficiency of the generators are compared. A 10 kW 24-slot/22-pole SFPM prototype is built and tested to validate the FE predicted results.
Original languageEnglish
Pages (from-to)1-1
Number of pages1
JournalIEEE Transactions on Industry Applications
Early online date7 Jan 2020
Publication statusE-pub ahead of print - 7 Jan 2020

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