Position Sensorless Control of Permanent Magnet Synchronous Motor Based on Reduced Order Quasi Resonant Extended State Observer

In this paper, an effective sensorless control strategy is introduced for permanent magnet synchronous motor drives, which utilizes a reduced order quasi-resonant extended state observer (ROQR-ESO). The existing linear extended state observer (LESO) does not accurately track the fast-varying back electromotive forces (bEMFs) due to its low-pass filtering characteristics. The proposed solution incorporates a ROQR controller to acquire bEMFs without phase lag. The Simulink verification validates the effectiveness of the model.