永磁同步电动机新型滑模观测器无传感器控制

由于传统滑模观测器算法存在固有抖振, 根据永磁同步电动机的数学模型, 设计了一种新的滑动模态观测器转子位置自检测控制算法; 切换函数采用饱和函数代替开关函数; 选择合适的边界层厚度以削弱抖振; 将反电动势估算值反馈到定子电流的观测计算中, 通过选择合适的反馈值来提高低速时转子位置角的估算精度和高速时系统的稳定性. 为了简化驱动系统的硬件结构以提高滤波效果, 设计了一个截止频率可随转子转速变化的低通滤波器对延迟进行补偿. 以1台表面式永磁同步电动机为对象进行实验, 实验结果表明, 这种新型滑模观测器对电机参

A novel sliding-mode observer for the sensorless control of permanent-magnet synchronous machines

To deal with the chattering in the traditional sliding-mode observer, we propose a novel sensorless control algorithm of the sliding-mode observer for the self-sensing estimation of rotor position. Being different from other observers, the sign function is replaced by a saturation function and the chattering problem is solved by properly choosing the thickness of the boundary layer. To increase the estimation precision of the rotor position at low speed and the stability of the system at high speed, the estimated back electromotive force is fed-back to the current observer. To achieve a better effect in filtration and to simplify the hardware structure, we design a low pass filter with a variable cut-off frequency depending on the rotor speed, which readily compensates the phase-angle delay over the entire speed range. Experimental results show that the proposed scheme is suitable for the sensorless control of a permanent-magnet synchronous machine over a wide speed range, and the novel algorithm is robust to uncertainties in operating conditions and parameters.