CES Transactions on Electrical Machines and Systems
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2026, 10(1): 87-96
Fault-Tolerant Control and Fault Diagnosis of Symmetrical Six-Phase Permanent Magnet Synchronous Motor Drives without Controller Reconfiguration
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Aihua Liu, Feng Yu, Qingan Zhu, Xiaoxin Wu
About Author:
Aihua Liu: Aihua Liu was born in Yancheng, China, in 2001. He received the B.Eng. degree in electrical engineering and automation in 2023 from the School of Electrical Engineering and Automation, Nantong University, Nantong, China, where he is currently working toward the M.Sc. degree in energy and power engineering. His main research interests include electric-drive-reconstructed onboard charging system and its fault-tolerant control applied in electric vehicle.
Feng Yu: Feng Yu (Member, IEEE) was born in Suzhou, China, in 1985. He received the B.Eng. degree in electrical engineering and automation from the School of Electrical Engineering, Sanjiang University, Nanjing, China, in 2008, the M.Sc. degree in electrical engineering from the School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China, in 2011, and the Ph.D. degree in the electrical engineering in the Department of Electrical Engineering, Southeast University, Nanjing, China, in 2016. Since 2016, he has been with Nantong University, Nantong, China, where he is currently a professor in the School of Electrical Engineering and Automation. His current research interests include the control of multiphase machines and drives for applications ranging from automotive to renewable energy.
Qingan Zhu: Qingan Zhu was born in Huainan, China, in 2002. He received the B.Eng. degree in electrical engineering and automation in 2024 from the School of Electrical Engineering and Automation, Nantong University, Nantong, China, where he is currently working toward the M.Sc. degree in control science and engineering. His main research interests include power electronics and electric-drive-reutilized onboard charger along with its application in electric vehicle.
Xiaoxin Wu: Xiaoxin Wu (Member, IEEE) was born in Nantong, China, in 1978. He received the B. Eng. degree in electric engineering and automation from the School of Automation, Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2000, and the M.Sc. and the Ph.D. degrees in electrical engineering from the School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, China, in 2006 and in 2019, Since 2000, he has been with Nantong University where he is currently an Associate Professor with the College of Electrical Engineering. His current major research interests include ac motor control, power electronic converters, and PWM converter/inverter systems.
doi: 10.30941/CESTEMS.2026.00002
Owing to the multi-degree-of-freedom characteristics and inherent ault-tolerant capacity, six-phase motors have been widely adopted in high-power applications, such as electric vehicle propulsion and aerospace systems. This paper presents the fault-tolerant control strategy of symmetrical six-phase permanent magnet synchronous motor (SSPMSM)under an isolated neutral point topology and proposes a fault diagnosis scheme based on joint diagnosis of multiple variables. First, two mathematical models of SSPMSM and their relationship are established. Subsequently, the current vectors in the torque subspace and harmonic subspace of the two winding sets under fault conditions are analyzed, and the cause of postfault torque ripple is explained as resulting from controller conflict. In addition, a multivariate fault diagnosis scheme based on voltage threshold in the x-y subspace and current trajectory characteristics in the α-β subspace is proposed to enhance the diagnostic accuracy. Finally, the feasibility and stability of the proposed control and diagnosis methods are verified by experiments.