<p>Dual three-phase permanent magnet synchronous motors (DTP-PMSMs) have emerged as a promising solution for high-reliability applications due to their inherent fault-tolerant capabilities. However, the strong electromagnetic coupling in non-phase-shift DTP-PMSMs under single-phase open-circuit faults can lead to significant torque ripple and speed fluctuations, which challenges the stability and performance of the drive system. Existing fault-tolerant control strategies often face limitations in terms of dynamic response and harmonic suppression during such faults. To address these issues, this paper proposes a robust self-tolerant control strategy for a mono-inverter driven non-phase-shift DTP-PMSM. First, a deadbeat predictive current controller (DPCC) is employed to replace the conventional PI regulator, leveraging the discrete-time model of the motor to achieve finite-step convergence, which enhances current tracking bandwidth and reduces harmonic distortion during fault transients. Second, an improved sliding mode control structure is developed by integrating a non-singular fast terminal sliding mode control (NFTSMC) with a disturbance observer, enabling real-time disturbance compensation and improved system robustness. Experimental results demonstrate that, compared to conventional methods, the proposed approach reduces speed ripple by 50%, torque ripple by 66.67%, and total harmonic distortion (THD) of healthy-phase and post-fault currents by 23.44% and 27.67%, while decreasing the load transient response time by 63.46%. This strategy significantly improves harmonic suppression and dynamic response under open-circuit faults, providing a practical solution for the high-performance fault-tolerant control of non-phase-shift DTP-PMSMs.</p>