Offline Stator Resistance Parameter Identification Method for PMSM Based on LADRC

Conventional offline parameter identification methods for stator resistance (Rs) in permanent magnet synchronous motors (PMSMs) suffer from a strong dependence on steady-state current convergence and limited anti-interference capability, leading to slow identification speed and poor stability. To address these issues, this paper proposes a novel fast offline identification method for resistance parameters based on linear active disturbance rejection control (LADRC). Under zero-speed or low-speed operating conditions, an observer of the d-axis current is constructed, leveraging the real-time disturbance estimation and compensation capabilities of LADRC to achieve direct and rapid identification of the stator resistance Rs. Compared with conventional methods such as the DC decay method and model reference adaptive method, the proposed approach significantly enhances identification speed and system stability without compromising accuracy. The effectiveness of the proposed strategy is validated through comparative simulation and experimental analyses.