【摘要】 为实现表贴式永磁同步电机的无传感器控制，设计了一种带负载扰动辨识的改进滑模观测器．针对传统滑模观测时的相位延迟和抖振现象，从滑模面、趋近律以及切换函数三方面进行改进，推导了基于新型滑模控制律的滑模观测器组成原理，同时验证了改进滑模观测器中不同切换函数对系统性能的影响．为避免使用传统的双闭环级联控制结构，利用非线性反馈积分滑模控制器代替PI调节器，加快了系统响应速度同时减小抖振．结果表明：基于双曲函数和幂函数的改进滑模观测器在变载阶段具有更好的观测性能，其转速估计误差分别减小为±4.36和±4.87rad/s．同时改进滑模观测器和积分滑模控制器组成的单回路结构能够有效避免传统PI控制的超调现象，进一步提升系统的动态性能．更多还原

【Abstract】 An improved sliding mode observer with load disturbance identification is designed for sensorless control of surface-mounted permanent magnet synchronous motor.To address the phase delay and chattering phenomenon in traditional sliding mode observation,the composition principle of the sliding mode observer based on the novel sliding-mode control law is derived by improving the sliding-mode surface,the convergence law and the switching function.The effects of different switching functions in the improved sliding mode observer on the performance of the system are also verified.To avoid using the traditional double-closed-loop cascaded control structure,a nonlinear feedback integral sliding mode controller is used instead of the PI regulator,which speeds up the system response while reducing chattering.The results show that the improved sliding mode observer based on hyperbolic and power functions has better observation performance in the variable load stage,and its speed estimation errors are reduced to±4.36 and±4.87 rad/s,respectively.Meanwhile,the single-loop structure composed of the improved sliding mode observer and the integral sliding mode controller can effectively avoid the overshoot phenomenon of the traditional PI control,and further improve the dynamic performance of the system.更多还原