为降低永磁同步电机(PMSM)在趋近参考转速时运动状态的波动，提升控制系统稳定性，设计了一种基于新型指数趋近律的滑模速度控制算法。基于传统的指数趋近律，引入在原点处更为平滑的函数替代原有的符号函数，实现控制算法在电机趋近运动时的平滑过渡，并通过Lyapunov函数验证了算法的稳定性。基于新型控制算法，搭建PMSM直接转矩控制的滑模控制器并在MATLAB/Simulink中进行仿真。仿真结果表明，提出的算法可较好实现PMSM控制，与传统指数趋近律控制系统相比，所设计的系统可有效降低系统抖振，增强鲁棒性。

In order to reduce the fluctuation of permanent magnet synchronous motor (PMSM) in approach motion status and improve the stability of the control system, a new sliding mode speed control algorithm based on exponential approaching law is designed. Based on the traditional exponential approaching law, a smoother function at the origin is introduced to replace the original symbolic function. The smooth transition of the control algorithm is expected to be realized when the motor runs in the approach motion status. The stability of the algorithm is verified by Lyapunov function. Based on the new control algorithm, a new sliding mode controller is built using MATLAB/Simulink software. The simulation results show that the proposed algorithm can better realize the control of PMSM. Compared with the traditional exponential approaching law control system, the designed system can effectively reduce the system chattering and enhance the robustness.

国家自然科学基金项目（51675354）；石河子大学国际合作项目（GJHZ202003）