基于参数辨识的永磁同步电动机无位置传感器控制

Sensorless Control of Permanent Magnetic Synchronous Motor Based on Parameter Identification

研究了基于参数辨识的永磁同步电动机无位置传感器控制算法。通过逆变器向电机绕组注入电压激励,根据其响应的电流来离线辨识电机的定子电阻和交轴电感。为了避免逆变器死区引起的辨识误差,采用差分的方式进行信号注入。利用辨识得到的电阻和电感值进行动态磁链的估计,结合软件锁相环估计出转子位置,从而能够在电机参数未知的情况下实现永磁同步电机的无传感器运行。通过实验验证了参数辨识算法和无传感器算法的有效性。

A method of sensorless control of permanent magnetic synchronous motor based on parameter identification is proposed. Voltage signal was injected to the motor via inverter, and the current response was used to off-line identify the stator resistance and cross-axis inductance. To avoid the adverse effect of inverter dead-zone on parameter identification, the injection signal was in the difference form. The identified resistance and inductance were used to estimate active flux, the rotor position was able to be obtained combing software phase locked loop. The sensorless control of motor could be achieved even though the electric parameters were unknown. The validity of the proposed method is verified by ample experiments.