Current Tracking Accuracy Optimization for Variable Flux Memory Machine Drive Systems Based on Improved ELADRC with Compensation Function

Variable flux memory machines (VFMMs) can perform flexible online magnetization state (MS) regulation via d-axis magnetizing current injection. However, the ultra-short duration and large amplitude of the magnetizing current, combined with significant parameter perturbation disturbances during MS manipulations, impose stringent demands on current tracking accuracy and system robustness. Conventional linear active disturbance rejection control (LADRC) suffers from inherent phase lag that impairs current tracking accuracy, whereas the error-based LADRC (ELADRC) improves dynamic response but leaves the critical need for enhanced disturbance rejection. The above demerits make the conventional LADRC unsuitable for VFMMs. To address these limitations, the compensation function ELADRC (CF-ELADRC) is proposed for VFMM drive systems, which is an inherently straightforward and robust current control strategy that offers faster dynamic response and exceptional anti-disturbance performance. Experimental results demonstrate that the proposed CF-ELADRC substantially outperforms both LADRC and ELADRC in terms of magnetizing current tracking accuracy and steady-state recovery rate during flux regulation operations, thereby confirming both the effectiveness and theoretical correctness of the proposed CF-ELADRC.