【目的】为解决永磁同步电机(PMSM)调速系统中因电机参数变化以及外部扰动造成控制精度降低等问题,本文研究了一种基于自适应增益的PMSM转速环无模型滑模控制策略。【方法】构建PMSM在内部参数变化以及受到负载扰动后的数学模型;选用自适应增益幂次趋近律,并结合无模型控制思想设计含有扰动项的无模型滑模控制器;使用新型的自适应增益超螺旋滑模观测器观测电机总扰动。【结果】借助Matlab/Simulink软件以及dSPACE平台进行仿真与试验对比,结果表明:在本文研究方法下,PMSM系统动态响应时间降低,转速波动与系统抖振降低,系统抗扰性、稳定性均有提升。【结论】本文所提方法能够有效提高PMSM转速环的控制精度、增强系统动态响应能力、抑制抖振并增强鲁棒性。

[Objective] To solve the problems of reduced control accuracy in permanent magnet synchronous motor (PMSM) speed control systems due to variations in motor parameters and external disturbances, a model-free sliding mode control method for the PMSM speed loop based on adaptive gain is investigated. [Methods] The mathematical model of PMSM under internal parameter changes and load disturbance was constructed. The adaptive gain power reaching law was selected and combined with the model-free control concept to design a model-free sliding mode controller containing a disturbance term. The total motor disturbance was observed using a novel adaptive gain super-twisting sliding mode observer. [Results] With the help of Matlab/Simulink software and dSPACE platform for simulation and experimental comparison, the results demonstrated that the proposed method reduced the dynamic response time of the PMSM system, decreased the rotational speed fluctuation and the system chattering, and improved disturbance rejection ability and stability. [Conclusion] The proposed method can effectively improve the control accuracy of the PMSM speed loop, enhance the dynamic response of the system, inhibit chattering, and improve robustness.