Phase Current Reconstruction Control for Dual Three Phase PMSM With Reduced Current Sensors

The dual three-phase permanent magnet synchronous motor (DTP-PMSM) is characterized by its low-voltage high-power output, high reliability, and high control flexibility, rendering it widely applicable. Conventional control systems for DTP-PMSMs typically necessitate a minimum of four current sensors for closed-loop control, contributing to increased control system costs and volume. This article proposes a method tailored for a zero-phase-shift DTP-PMSM, utilizing two Hall current sensors to sample multiple branch currents and reconstruct phase currents. The article provides a detailed exposition of the principles behind six-phase current reconstruction using zero voltage vector sampling in a DTP-PMSM, along with the corresponding drive system structure. An analysis of the sampling delay, reconstruction dead zone, and inherent reconstruction errors associated with this method is presented. Simulation and experimental results ultimately validate the effectiveness of the proposed control strategy.