Influence of Stator MMF Harmonics on the Utilization of Reluctance Torque in Six-Phase PMA-SynRM with FSCW

Luming Cheng, Yi Sui, Ping Zheng, Zuosheng Yin and Chuanze Wang
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Luming Cheng: Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China
Yi Sui: Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China
Ping Zheng: Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China
Zuosheng Yin: Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China
Chuanze Wang: Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China

Energies, 2018, vol. 11, issue 1, 1-17

Abstract: Although fractional-slot concentrated winding (FSCW) offers many significant advantages, such as short end-turn windings, high slot filling factor, and low cogging torque, it is frequently limited by excessive stator magnetomotive force (MMF) harmonics which will induce high eddy losses in the permanent magnets (PMs). What is more, in the literature, it can be observed that the reluctance torque of the salient-pole machine with FSCW is usually much lower than that obtained with integral slot winding. To explore the underlying reason why the reluctance torque in a salient machine with FSCW significantly decreases, a new six-phase FSCW with 24 slots and 10 poles, which can significantly reduce the undesirable stator MMF harmonics, is obtained by using the concept of stator shifting. Then, two permanent-magnet-assisted synchronous reluctance machines (PMA-SynRMs) with the proposed winding layout and conventional asymmetric 12-slot/10-pole six-phase winding layout are designed and simulated by the finite-element method (FEM). The reluctance torque, total torque, and d / q -axis inductances with different current phase angles are also compared under different loaded conditions. The results show that a reduction in stator MMF harmonics can indeed lead to a significant enhancement in reluctance torque under heavy loaded conditions, while the dominance will diminish under light loaded conditions.

Keywords: fractional-slot concentrated winding (FSCW); stator magnetomotive force (MMF); six-phase; reluctance torque (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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