交流伺服电动机是应用于伺服驱动领域的一类永磁交流电动机，一般可分为两大类：反电势为方波的直流无刷电动机和反电势为正弦波的永磁同步电动机、水磁同步驱动比无刷直流驱动可获得更小的转矩脉动，是高性能交流伺服驱动的最佳选择，永磁同步电动机的转矩控制是伺服运行的基础．本文从永磁同步电动机转矩控制原理出发，全面地综述了各种典型的转矩控制方案，并重点地研究了平均转矩和瞬时转矩控制技术 AC servo motor is a kind of permanent magnet AC motor used in the field of servo drive. Generally, it can be divided into two categories: DC brushless motor with back EMF and permanent magnet synchronous motor with back EMF sine wave, Driving a smaller torque ripple than a brushless DC drive is the best choice for high performance AC servo drives. Torque control of a PMSM is the basis for servo operation. In this paper, starting from the principle of permanent magnet synchronous motor torque control, a comprehensive overview of a variety of typical torque control programs, and focused on the average torque and instantaneous torque control technology