基于三阶反馈控制器的永磁同步电动机控制方法

Control Method of Permanent Magnet Synchronous Motor Based on Third⁃order Feedback Controller

为提高永磁同步电动机的角速度控制准确度,设计三阶反馈控制器对其进行控制。分析永磁同步电动机的结构特征以及磁场的回路特征。利用永磁同步电机的转动角速度,得出其运动模型。基于定子电感和电阻,求取绕组为对称状态下转子的状态方程。将电机的角位置引入到该状态方程中,得出永磁同步电动机的全阶数学模型。以此全阶数学模型为基础,计算出永磁同步电动机角位置的三阶模型。构造三阶反馈控制器,通过目标角位置求取电机的输入电压,以控制其角速度。采用滑模观测器与所设计的方法对目标角位置和角速度进行跟踪测试。结果表明:该方法的跟踪效果优于滑模观测器,能够更准确地跟踪目标角位置和角速度,可对永磁同步电动机的角速度进行准确控制。

In order to improve the angular speed control accuracy of permanent magnet synchronous motor(PMSM),a thirdorder feedback controller was designed.The structure characteristics of the PMSM and the loop characteristics of the magnetic field were analyzed.The motion model of the PMSM was obtained by using its angular velocity.The state equation of the rotor with symmetrical winding was obtained by using stator inductance and resistance.The angle position of the motor was introduced into the state equation,and the full order mathematical model of the PMSM was obtained.Based on the full order mathematical model,the third order model of the angle position of the PMSM was calculated.A thirdorder feedback controller was constructed,and the input voltage of the motor was obtained through the target angle position to control the angular velocity.The sliding mode observer and the designed method were used to track the target angular position and speed.The results show that the tracking effect of the proposed method is better than that of the sliding mode observer,and the target angular position and speed can be tracked more accurately,and the angular speed of the PMSM can be controlled accurately.