基于Luenberger观测器的高速PMSM无传感器技术研究

摘要

在永磁同步电动机系统中,机械位置传感器的使用会增加系统的体积和成本,降低系统可靠性,因此无传感器控制技术已成为电机控制领域的研究热点.首先提出了基于龙伯格(Luenberger)观测器的高速永磁同步电动机无传感器控制技术,分别实现了对电机转子速度和位置的估算；同时采用了频率预畸变双线性变换的离散化算法,以保证Luenberger观测器在离散化前后对电机基波角频率处的信号具有相同的响应特性.最后对Luenberger观测器进行了仿真验证,由仿真结果可知,采用频率预畸变双线性变换的Luenberger观测器对转子速度和位置均具有较高的估算精度.%In the permanent magnet synchronous motor (PMSM) system,the use of mechanical position sensors may increase the system volume and cost and reduce the system reliability, so sensorless control techniques have become the research hotspot in the motor control domain. The sensorless control technique for high-speed PMSM based on Luenberger observer was proposed,which was used to estimate the rotor speed and position of the motor. Then frequency pre-warping bilinear transform discretization method was adopted to ensure the same response characteristic for Luenberger observer before and after discretization at the motor's fundamental angular frequency. The simulation results of Luenberger observer show that Luenberger observer after frequency pre-warping bilinear transform discretization has an excellent estimation precision for the rotor speed and position.