基于改进型滑模观测器的PMSM无位置传感器控制
Sensorless Control of Permanent Magnet Synchronous Motor Based on the Improved Sliding Mode Observer

针对经典滑模观测器在永磁同步电机无位置传感器控制过程中的抖振问题，研究了一种改进型滑模观测器。分析了经典滑模观测器产生抖振的原因，采用饱和函数代替符号函数实现抖振的抑制，结合磁场定向控制技术实现永磁同步电机的转速估计，在1台2.7 kW，10 000 r/min的永磁同步电机硬件平台上进行实验验证。仿真分析和实验结果表明，改进后的滑模观测器能够准确估计转速并减弱转子位置估计过程中的抖振。
Sliding mode observer (SMO) which has a strong robustness is used in the sensorless control system of permanent magnet synchronous motor (PMSM). The method is usually used to estimate the rotor position although it has the chattering problem. According to the causes of the chattering in traditional SMO, the method of improved sliding mode observer (ISMO) is proposed in this paper. Sign function is replaced by the saturation function to suppress the chattering problem, and the speed of PMSM is estimate when combined with field oriented control (FOC) method. A hardware platform of 2.7 kW, 10 000 r/min PMSM is built to verify the control effectiveness of ISMO. Simulation analysis and experimental result show that ISMO can estimate the rotor speed accuracy and reduce the chatting at the same time