PLL type estimator applied in PMSM sensorless control for speed and position
Microcomputer Control for Sensorless Brushless Motor
New Sliding-Mode Observer for Position Sensorless Control of Permanent-Magnet Synchronous Motor
Review of position-sensorless operation of brushless permanent-magnet machines
An online identification method for both stator resistance and back-EMF coefficient of PMSMs without rotational transducers