基于自适应磁链观测器的无传感器检测技术研究

Research on the Sensorless Detection Technique Based on the Self-Adaptive Flux Linkage Observer

基于两相静止坐标系下的永磁同步电动机状态方程,将自适应状态观测器理论应用到磁链位置估计法中,提出了一种基于自适应磁链观测器的估算转子磁极位置和转速的方法.该方法以定子电流和转子磁链为状态变量构造状态观测器,以观测器模型与电机模型的电流误差构成自适应律,通过对线电流和转子磁链的估算实现对转子位置信息的检测.最后用Simulink建立了采用该方法的矢量控制系统的仿真模型,结果表明该估算方法有较高的估算精度和较强的鲁棒性.

Based on the PMSM state equation in two still coordinates, self-adaptive-observer theory was applied to the flux linkage estimation method, and a detection approach of rotor position and speed based on self-adaptive flux linkage observation was proposed. The method, using rotor flux and stator current as state variables to set up observer, and the error of stator current to form adaptive laws, real- ized the detection of rotor position by estimation of the Linear current and rotor magnetic chain. Basing on this method, the simulation model of the vector control system of PMSM was set up. The result indicates that the method has higher estimation accuracy, and is not sensitive to the change of parameters.