永磁同步电机无位置估计误差的滑模观测器无速度传感器控制方法

传统滑模观测器(SMO)无速度传感器控制方法在电机的运行速度出现较大变化时,对位置的估计会出现稳态误差。为了消除位置的估计误差,提出了一种带有反动电势修正的SMO无速度传感器控制方法。反电动势的修正律基于永磁同步电机(PMSM)的dq轴电流模型。即使电机运行在速度大幅波动的情况下,也能保持位置估计误差为零,且该方法计算增量较小,易于实现。将所提出的方法在1台1.5 kW的PMSM上进行了仿真和试验,结果验证了位置估计误差能有效地收敛至零。

No Estimation Error Speed Sensorless Control Method for PermanentMagnet Synchronous Motor Based on Sliding Mode Observer

In traditional sliding mode observer (SMO) speed sensorless control method, a steadystate error would exist in position estimation when the speed of the motor fluctuated greatly. In order to eliminate the estimation error, a back electromotive force (backEMF) corrector was proposed based on the dqaxis current model of permanent magnet synchronous motor (PMSM). In this way, the position estimation error was kept at zero even under large speed fluctuation. Moreover, the proposed method was easy to implement and brought about small increment in calculation cost. Numerical simulations and experiments were carried out on a 1.5 kW PMSM. The results demonstrate that the proposed method can effectively estimate rotor position and the steadystate estimation error converges to zero.