基于扰动观测器与最小二乘法惯量辨识的永磁同步电机控制

摘要

The disturbance observer for permanent magnet synchronous motor (PMSM) can effectively restrain the external torque disturbance.Since the parameters of PMSM are time-varying and uncertainty,the performance of disturbance observer declines.A recursive weighted least squares estimation was used to identify the moment of inertia after change.The corrected moment of inertia was used to the disturbance observer.The simulation results showed that this method could precisely identify the moment of inertia online.The method improved the ability of motor to restrain external torque disturbance when the load change.%将扰动观测器(DOB)用于永磁同步电机(PMSM)的控制能够有效抑制外部力矩扰动,但由于PMSM参数存在时变和不确定性,导致DOB的控制品质下降.提出采用递推加权最小二乘法对变化后的转动惯量进行辨识,将修正后的转动惯量用于DOB.仿真试验表明,该方法能够高精度地对转动惯量进行实时在线辨识,提高了电机在变负载情况下的抗外部力矩扰动的能力.