Axial Split Phase Integral Slot Concentrated Winding Permanent Magnet Fault Tolerant Motors and Its Investigation of Interturn Short Circuit Faults Suppression

Considering that traditional fractional slot concentrated winding permanent magnet fault tolerant motor (FSCW-PMFTM) has poor isolation capability between phases and weak suppression capability of interturn short circuit fault (ITSC), this paper proposes an axial split phase integral slot concentrated winding PMFTM (ASP-ISCW-PMFTM). The proposed motor has better electrical, magnetic and thermal isolation capability between phases. The basic topology, working principle and electromagnetic performance of the proposed motor is investigated. Also, the ITSC fault suppression mechanism of ASP-ISCW-PMFTM is theoretically analyzed. Then, by considering the change of insulation contact resistance, the ITSC current, post fault loss and temperature of ASP-ISCW-PMFTM are compared with that of traditional FSCW-PMFTM at different contact resistance conditions by simulation analysis. The results show that compared with traditional FSCW-PMFTM, the severity of ITSC of the proposed ASP-ISCW-PMFTM is greatly reduced at every fault stage, and the impact of the fault on the healthy phase is small, which realizes the purpose of suppressing and isolating the ITSC fault from the machine structure. Finally, a prototype of ASP-ISCW-PMFTM is designed, and the test results are consistent with that of theoretical analysis and FEA, which verify the accuracy of the above analysis. ©2023 Chin.Soc.for Elec.Eng.