针对永磁同步电机矢量控制系统易受电机参数变化和负载扰动影响的问题，提出了基于负载观测的非奇异快速终端滑模控制策略。设计了非奇异快速终端滑模速度控制器替代了传统PI调节器，提升了系统鲁棒性，同时引入负载转矩观测器对负载实时观测，并将观测值作为电流前馈补偿，提升了系统抗负载扰动能力。仿真结果表明：与PI控制相比，所提控制策略有更快的响应速度，对负载扰动有较强的鲁棒性。

Aiming at the problem that the permanent magnet synchronous motor vector control system is susceptible to motor parameter changes and load disturbances, a non singular fast terminal sliding mode control strategy based on load observation is proposed. A non singular fast terminal sliding mode speed controller is designed to replace the traditional PI regulator, which improves the system robustness. At the same time, a load torque observer is introduced to observe the load in real time, and the observed value is used as current feedforward compensation to improve the system anti load-disturbance ability. Simulation results show that compared with PI control, the proposed control strategy has a faster response speed，and has strong robustness to load disturbances.