基于非线性磁链观测器的永磁同步电机无位置传感器自抗扰控制策略

To address the problems of DC bias and integral drift resulting from the pure integral link in traditional flux observers, a nonlinear flux observer is developed based on the mathematical model of a surface-mounted permanent magnet synchronous motor under the stationary coordinate system. Then, the information about the rotor position and speed is extracted using the phase-locked loop technology. In consideration of the working condition of the aviation pump load, the disturbances caused by nonlinear factors such as frequent changes in load torque and the dead time of an inverter will impact the speed and current regulation performance of position-sensorless control. This further results in increases in the magnetic field orientation error and rotor position estimation error. By combining with the linear active disturbance rejection control technology, a position-sensorless active disturbance rejection control strategy based on a nonlinear flux observer is proposed, which enhances the anti-disturbance capability of the position-sensorless closed-loop system. The effectiveness of the proposed position-sensorless control strategy was verified through a comparison between the simulation and experimental results.