Novel position and speed estimator for PM single phase brushless D.C. motor drives: Validation with experiments

A novel position and speed estimator for single phase permanent magnet brushless d.c. (PMBLDC) motor drives, based on flux integration and prior knowledge of Ψ_PM (θ) is proposed here and an adequate correction algorithm is adopted in order to increase the robustness to noise and to reduce the sensitivity to accuracy of flux linkage estimation. A speed and current close loop control is employed based on the Hall signal and the motor is controlled at different speeds in order to validate the proposed estimation algorithm with satisfying results. The position correction effect is analyzed by examination of improvements in both position error and speed pulsations.