基于改进超螺旋滑模观测器的无刷直流电机无传感器控制

Sensorless Control of Brushless DC Motor Based on Improved Super-Twisting Sliding Mode Observer

针对传统滑模观测器存在高频抖振和抗扰动能力差的问题,提出一种基于改进超螺旋滑模观测器的无刷直流电机无传感器控制方法。在超螺旋滑模算法的基础上,采用附加线性环节的线性超螺旋滑模观测器以提升观测性能;对增益参数进行自适应设计,实现观测器增益参数的动态自整定;同时,为抑制切换过程产生的系统抖振,采用softsign函数替代不连续的符号函数;为进一步提高系统抵抗扰动的能力,在速度环加入自抗扰控制结构增强系统稳定性;搭建系统仿真模型,验证所提方法能较好地适用于宽速域工况,具有较好的跟踪性和估算精度。

A sensorless control method for brushless DC motors based on an improved super-twisting sliding mode observer is proposed to address the issues of high frequency jitter and poor disturbance resistance of traditional sliding mode observers.On the basis of the super-twisting sliding mode algorithm,a linear super-twisting sliding mode observer with additional linear links is adopted to improve the observation performance,and design adaptive gain parameters to enable automatic adjustment of observer gain parameters.At the same time,in order to reduce system jitter caused by switching,the softsign function is used instead of discontinuous sign functions.In order to further improve the system's ability to resist disturbances,an active disturbance rejection control structure is added to the speed loop to enhance the stability of the system.A simulation model of the system was constructed,and the experimental results showed that the proposed method is well adapted to operate over a wide speed range,with fast tracking and estimation accuracy.