Inverter Reconstruction Approach for Open-End Winding Five-Phase PMSM With Pattern-Based Vector Synthesis and Hybrid SVPWM Modulation

Due to the overloading, vibration, and harsh conditions, switching transistors in open-end winding five-phase permanent magnet synchronous motors (OWFP-PMSMs) drives are more vulnerable to failure. Addressing the increased post-fault current in existing fault-tolerant control (FTC) methods, this article presents an inverter reconstruction approach for the OWFP-PMSM. When transistor failure occurs, the inverter reconstruction approach is achieved by connecting the winding to the midpoint of the bus capacitor. A pattern-based virtual voltage vector synthesis method is introduced to achieve voltage vectors that existing modulation methods cannot synthesize. Then, a hybrid SVPWM strategy is adopted to achieve dual inverter modulation and capacitor voltage compensation in the OWFP-PMSM drive system. The innovation of this article not only enhances the FTC capability of the OWFP-PMSM drive system but also maintains good postfault steady-state performance. Moreover, the amplitude of the postfault phase current resembles that observed during healthy operation, which is a significant reduction compared to the established FTC strategy. Through simulations and experiments, the effectiveness of the proposed method is demonstrated. The results show that the phase current amplitude is reduced by up to 26.5% during steady-state operation compared to the existing method.