Voltage Vector Combination Sampling Method Using a Single Current Sensor for DTP-PMSM Six-Phase Current Reconstruction

In zero phase-shift dual three-phase permanent magnet synchronous motor (DTP-PMSM) drive, phase current reconstruction methods have been adopted to reduce the number of current sensors. However, linearly dependent sampling states inherent to the DTP-PMSM topology pose a critical challenge for acquiring six-phase current information with fewer sensors. To address this issue, a voltage vector combination sampling method (VVCSM) tailored for 0° DTP-PMSM is proposed in this work, which can reconstruct six-phase currents based on a single current sensor (SCS). The core of the proposed method lies in the integration of wiring reconfiguration and π/2 carrier phase-shifting. By strategically optimizing the SCS installation positions and coordinating carrier phases, the system gains the capability to sample currents within specific voltage vector combination windows. This allows VVCSM to shift the boundary measurement dead zones away from sector boundaries toward the inner and outer limits of the combined space-vector plane, without real-time pulsewidth modulation modification. Theoretically, VVCSM decouples the topological signals, ensuring that the reconstruction matrix remains invertible. Furthermore, the π/2 carrier phase-shifting reshapes the switching harmonic components, thereby attenuating the dominant even-order torque harmonics and reducing the resulting high-frequency torque ripple. The performance of six-phase current reconstruction under steady-state and dynamic conditions, alongside the effectiveness of torque ripple suppression, is validated on simulations and experimental platforms.