Improved adaptive parameters estimation considering transient‐state estimation error in sensorless control system of IPMSM

Abstract

Abstract Position sensorless vector control of interior permanent magnet synchronous motors (IPMSMs) has been used for downsizing, cost reduction, and high reliability. In the position sensorless vector control, the q‐axis inductance decreases as the q‐axis current increases due to the load variation, which results in deterioration of the position estimation performance without considering the q‐axis inductance. Here, the authors propose an innovative adaptive estimation based on the dynamic certainty equivalence principle for high‐performance position sensorless control for IPMSMs. The effectiveness of the proposed adaptive scheme is verified through experiments.