传统的磁场定向控制方法需要安装多个相电流传感器和位置传感器，导致系统成本高、体积大且可靠性低。为解决此问题，提出了一种基于单直流母线电流采样的永磁同步电机(PMSM)无位置传感器控制策略。针对传统单直流母线采样方案存在电流重构盲区的问题，提出了矢量移相法。针对PMSM低速无位置传感器控制问题，提出了高频方波注入控制策略。最后，基于Matlab/Simulink平台搭建仿真模型对理论分析进行验证，仿真结果表明所提策略能够有效解决低调制比区域和扇区边界盲区的问题，实现PMSM无位置传感器低速运行控制。

Traditional field oriented control method requires multiple phase current sensors and position sensors, leading to high system costs, large size, and reduced reliability. To address this issue, a sensorless control strategy for permanent magnet synchronous motor (PMSM) based on single DC bus current sampling was proposed. To solve the problem of current reconstruction blind zones in conventional single DC bus sampling schemes, a vector phase-shifted method was introduced. Additionally, a high-frequency square-wave injection control strategy was proposed to tackle the sensorless control challenges of PMSM at low speeds. Finally, a simulation model was built on the Matlab/Simulink platform to verify the theoretical analysis. The simulation results showed that the proposed strategy effectively solved the blind zone problem in the low modulation ratio region and sector boundaries, enabling sensorless low-speed operation of the PMSM.