中文摘要：

为解决纯电压模型磁链观测器存在的积分漂移和饱和问题，常采用低通滤波器代替纯积分器。针对传统低通滤波器磁链观测方案的不足，本文提出一种改进的转子磁链观测方案，采用串联低通滤波器提取直流偏置得到理想的转子反电势，然后用可编程低通滤波器代替纯积分器，并在反电势低通滤波前补偿磁链误差。所提出的观测器可以有效消除直流偏置的影响，提高磁链观测的动态精度并改善系统的动态性能。在一台2．2kW感应电机无速度传感器矢量控制系统上对本文提出的改进转子磁链观测器方案进行了仿真和实验研究，结果验证了其正确性和有效性。

英文摘要：

In the pure voltage model based flux observer, a LPF is normally used to replace the pure integrator to avoid integration drift and saturation problems. In order to eliminate the DC offset efficiently and compensate the error brought about by LPF as well as improve the dynamic performance, a modified rotor flux observer is proposed in this paper. In the proposed scheme, series LPF is used to remove the DC drift firstly, then a programmable LPF is used instead of the pure integrator, and the amplitude and phase error is compensated before the back EMF filtered for the flux estimation. Simulation and experiment based on induction motor speed sensor-less vector control systems verified its correctness and effectiveness.