基于信号注入的极低速PMSM无速度传感器控制

Speed Sensorless Control of PMSM at Very Low Speeds Based on Signal Injection

介绍了一种极低速段永磁同步电机无速度传感器矢量控制方法。该方法基于低频信号注入,通过注入低频定子电流信号,利用产生的电压响应估计电机转速,不依赖于永磁同步电机的非理想特性,仅利用基波模型就可实现转速估计。因此,该方法不仅适用于内埋式永磁同步电机,还适用于表面式永磁同步电机。通过理论分析及大量的仿真实验证明,提出的低频信号注入方法可以很好地实现表面式永磁同步电机在极低速甚至零速区的无速度传感器矢量控制。

A sensorless vector control method for permanent magnet synchronous motor （PMSM） drive at very low speed was presented. The proposed method is based on low-frequency signal injection, where a low frequency stator current signal is injected and the corresponding voltage response is detected to estimate the rotor speed. This method doesnrt rely on the non-ideal features but just the fundamental model of PMSM. As a result, the introduced method can be applied to not only interior magnet synchronous motors, but also to surface mounted magnet synchronous motors. Theoretical analysis and various simulations prove the good performances of the introduced method on speed sensorless control of PMSM at very low speed and even at zero speed.