Abstract: This paper presents a five-phase fault-tolerant permanent-magnet synchronous machine (PMSM) used for electric vehicles. In multiphase fault-tolerant PMSMs equipped with fractional-slot concentrated windings, excessive magneto-motive force (MMF) harmonics can lead to thermal demagnetization of the permanent magnets (PMs). In order to reduce the lower-order harmonics, the origins of the 2-pole harmonic in conventional winding configurations are investigated, and an unequal-turn winding configuration is applied to cancel the lower-order harmonics. The main electromagnetic performances of the unequal-turn winding configuration are investigated and compared with conventional winding topologies. Based on the principle of maintaining constant instantaneous power, the fault-tolerant control strategies for open-circuits of up to two phases are developed. All of the investigations are verified by finite element analysis (FEA) results.
Keywords: five-phase PMSM; fault-tolerant control; fractional-slot concentrated windings; unequal-turn winding configuration; lower-order harmonic; electric vehicle
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Sui, Y.; Zheng, P.; Wu, F.; Yu, B.; Wang, P.; Zhang, J. Research on a 20-Slot/22-Pole Five-Phase Fault-Tolerant PMSM Used for Four-Wheel-Drive Electric Vehicles. Energies 2014, 7, 1265-1287.
Sui Y, Zheng P, Wu F, Yu B, Wang P, Zhang J. Research on a 20-Slot/22-Pole Five-Phase Fault-Tolerant PMSM Used for Four-Wheel-Drive Electric Vehicles. Energies. 2014; 7(3):1265-1287.
Sui, Yi; Zheng, Ping; Wu, Fan; Yu, Bin; Wang, Pengfei; Zhang, Jiawei. 2014. "Research on a 20-Slot/22-Pole Five-Phase Fault-Tolerant PMSM Used for Four-Wheel-Drive Electric Vehicles." Energies 7, no. 3: 1265-1287.