基于锁相环的位置与速度估计器在无传感器控制中的不良振荡研究

Phase-locked loops (PLL) are increasingly used for position and speed estimation in speed sensorless control of permanent-magnet synchronous motors. In this article, the saddle point characteristic phase-portrait is developed to explore the undesirable oscillation phenomena of PLL-based position and speed estimators for speed sensorless control. First, the large-signal model of the PLL-based posit...