基于滑模观测器的高速PMSM无传感器控制

Sensorless Control of High Speed PMSM Based on Sliding Mode Observer

针对基于饱和函数滑模观测器方法存在调节参数多及低通滤波器带来的相位延迟问题,研究一种基于超螺旋算法的滑模观测器无传感器控制策略,通过理论推导及系统稳定性分析,设计了一种滑模系数根据转速变化在线调节的自适应滑模系数算法。通过实验验证了该方法相比于基于饱和函数滑模观测器,能在较宽速度范围内有效地抑制抖振,提高了无传感器控制系统的估计精度,简化了参数调节过程及滤波器设计环节。

A sensorless control strategy for sliding mode observers based on the super twisting algorithm is studied to address the problem of multiple adjustment parameters and phase delay caused by the use of low-pass filters in the saturation function based sliding mode observer method.Through theoretical derivation and system stability analysis,an adaptive sliding mode coefficient algorithm that adjusts the sliding mode coefficient online according to speed changes is designed.Compared with the sliding mode observer based on saturation function,this method can effectively suppress chattering in a wide speed range,improve the estimation accuracy of sensorless control system,and simplify the process of parameter adjustment and filter design.