无刷直流电机转速伺服系统动态面控制

摘要

为满足超燃冲压发动机燃油供应系统对电动泵用电机驱动控制精度和响应速度的要求,提出一种新颖的基于扩张状态观测器的动态面控制策略,应用在无刷直流电机(BLDCM)转速伺服系统,有效克服了无刷直流电机的参数摄动和负载扰动.建立基于相电流的电机动态模型,通过扩张状态观测器,在外部扰动模型未知的情况下,观测电机负载转矩用于构造动态面控制器,并证明闭环系统转速一致最终稳定.仿真和试验结果表明,与经典PID控制方法相对比,动态面控制策略显著提高了无刷直流电机转速伺服系统的闭环精度和动态性能,对电机参数摄动和负载扰动具有良好的抑制作用.%Due to the requirements of control precision and response speed for pump motor drive applied to scramjet fuel feed system, This paper proposes a novel dynamic surface control (DSC) base on extended state observer (ESO) applied in the brushless DC motor (BLDCM) speed servo system.This method solves the problem of the variation of motor parameters and the disturbance of load torque.A simplified dynamic model of BLDCM is designed based on the phase currents.By the ESO, the torque of BLDCM can be evaluated exactly with partially unknown states of external disturbance, and a controller is developed through the DSC technique.A stability analysis is given, showing that the control law can guarantee uniformly ultimate boundedness of the solution of the closed-loop system.Compare with the traditional PID controller, the simulated and experimental results show that the control precision and dynamic performance of the system can be significantly improved by using the proposed strategy.Furthermore, the robustness for changes of motor parameters and load torque disturbance can be guaranteed.