In the vector control closed-loop system of permanent magnet synchronous motors

low-resolution switched Hall position sensors are used to resolve motor rotor position and speed

ensuring operational performance while effectively reducing costs. Addressing the current demand for enhanced position resolution accuracy in electromechanical servo systems

a rotor position calculation strategy was proposed combining an adaptive frequency tracking filter with an orthogonal phase-locked loop. In this method a 3/2 coordinate transformation was employed to convert symmetric three-Hall signals into orthogonal signals containing rotor position information. Subsequently

an adaptive frequency tracking filter removes high-frequency components to extract the fundamental frequency signal representing rotor position. Phase-locked loop technology was then applied to derive precise rotor position and speed information. The approach features a simple structure and strong robustness. Hardware-in-the-loop simulation experiments based on PLECSBox validated correctness and feasibility of this approach. Simulation results demonstrate that the proposed scheme achieves rotor position calculation errors below 0.08 rad under various operating conditions

effectively enhancing rotor position estimation accuracy.