摘要：针对传统永磁同步电机直接转矩控制(DTC)中存在的磁链和转矩脉动较大、低速时难以准确控制等问题，根据永磁同步电机的数学模型，结合二阶滑模和直接转矩控制思想，提出了基于二阶滑模速度控制器的永磁同步电机直接转矩控制系统。仿真结果表明，与传统的PI 控制相比，二阶滑模的速度控制器对系统参数和外部干扰表现出较强的鲁棒性，能够在有限时间内收敛，且消弱了常规滑模控制中存在的抖振，整个系统的控制效果也得到了很大改善。
关键词：二阶滑模；直接转矩控制；永磁同步电机

Abstract:To solve the problems of large flux and torque ripple，difficulty to accurately control at very low speed in the conventional direct torque control (DTC) of permanent magnet synchronous machine (PMSM)，based on the model of permanent magnet synchronous motor，combined two order sliding mode with direct torque control，a direct torque control scheme of PMSM system based on two order sliding mode was proposed.Simulation results show that，compared with the scheme based on traditional PI control，the speed controller of two order sliding mode has stronger robust to motor parameter and disturbance，and attenuated the chatter，the whole control effect is improved greatly.
Key Words:Two order sliding mode；Direct torque control；Permanent magnet synchronous motor