基于改进的滑模观测器永磁同步电动机转速估计

Speed Estimation of Permanent Magnet Synchronous Motor Based on Improved Sliding Mode Observer

传统滑模观测器因滑模固有抖振会使电机速度与转子位置估计存在误差,为了准确估计永磁同步电动机转子位置与速度,提出了一种带锁相环的滑模观测器,将锁相环和滑模观测器结合起来估计转速,这种方法能够有效抑制滑模观测器抖动现象。仿真表明采用锁相环跟踪转子速度与位置有效地提高了估计精度,实验证明了所提方法的正确性和可行性。

The traditional sliding mode observer estimated motor speed and rotor position exist errors for its buffeting. In order to accurately estimate the rotor position and motor speed,a sliding mode observer with phase- locked loop was proposed. The phase- locked loop and the sliding mode observer were combined to estimate motor speed can effectively restrain dithering phenomenon. Simulation shows that using phase- locked loop to track motor speed and rotor position can effectively improve the estimation precision. The experiments show the validity and feasibility of the method.