Fault-Tolerant Direct Torque Control with Harmonic Suppression for Dual Three-Phase SynRMs Using a Five-Leg Inverter.

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Bibliographic Details
Title:	Fault-Tolerant Direct Torque Control with Harmonic Suppression for Dual Three-Phase SynRMs Using a Five-Leg Inverter.
Authors:	Yuan, Ye¹, Nan, Yu¹ nanyu12024@163.com, Yang, Fan¹, Hua, Yizhou², Li, Shusheng³, Niu, Weiping¹, Kong, Zhenzhen¹, Wang, Xifeng¹, Chen, Sichao⁴
Source:	Progress in Electromagnetics Research C. 2026, Vol. 166, p257-266. 10p.
Subjects:	Fault-tolerant control systems, Torque control, Electric inverters, Harmonic suppression filters, Electric motors
Abstract:	High reliability and stability are essential for drive systems in intelligent inspection robots used in the power industry. To meet this requirement, this study investigates dual three-phase synchronous reluctance motors and proposes a five-leg fault-tolerant drive strategy based on directtorque control (DTC). Unlike conventional dimension-reduction coordinate transformation methods that require isolating the faulty phase, which often leads to degraded system performance, the proposed approach introduces a bridge-arm sharing technique. By electrically coupling the faulty phase with a healthy phase, the spatial voltage vector distribution was reconstructed, enabling the reutilization of the faulty phase windings. Under single-phase fault conditions, the method effectively synthesizes the missing voltage vectors, preserves a circular flux linkage trajectory in the α-β subspace, suppresses the 5th and 7th harmonics, and improves the current waveform quality. Simulation results verify that the strategy delivers superior harmonic suppression, reduced torque ripple, and enhanced system reliability, offering a novel technical pathway for fault-tolerant control of multiphase motors with strong potential for engineering applications. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	High reliability and stability are essential for drive systems in intelligent inspection robots used in the power industry. To meet this requirement, this study investigates dual three-phase synchronous reluctance motors and proposes a five-leg fault-tolerant drive strategy based on directtorque control (DTC). Unlike conventional dimension-reduction coordinate transformation methods that require isolating the faulty phase, which often leads to degraded system performance, the proposed approach introduces a bridge-arm sharing technique. By electrically coupling the faulty phase with a healthy phase, the spatial voltage vector distribution was reconstructed, enabling the reutilization of the faulty phase windings. Under single-phase fault conditions, the method effectively synthesizes the missing voltage vectors, preserves a circular flux linkage trajectory in the α-β subspace, suppresses the 5th and 7th harmonics, and improves the current waveform quality. Simulation results verify that the strategy delivers superior harmonic suppression, reduced torque ripple, and enhanced system reliability, offering a novel technical pathway for fault-tolerant control of multiphase motors with strong potential for engineering applications. [ABSTRACT FROM AUTHOR]
ISSN:	19378718
DOI:	10.2528/PIERC25111003