An Adaptive Hybrid Flux-Weakening Control Method with Single Regulator and Dual Current Compensation for Permanent Magnet Synchronous Motor

Introduction: Traditional flux-weakening control methods struggle to address the issue of high-performance and stable operation of permanent magnet synchronous motors within the high-speed range. This paper designs an adaptive hybrid flux-weakening current observer and proposes a single-regulator control method with dual current compensation, aiming to enhance motor control performance under high-speed conditions. Methods: An adaptive hybrid flux-weakening current observer was designed, along with a dual- current compensation strategy. A speed regulator with anti-windup based on conditional integration was incorporated into the PMSM flux-weakening system. Furthermore, a nonlinear variable-parameter regulator was developed to combine fast PI-like convergence with improved stability. Results: Experiments were conducted using the TI digital signal processor TMS320F28335 and a three-phase voltage-source converter. The proposed method reduces voltage overshoot by approximately 75% during transients. The d-axis current responds rapidly to load-torque changes with minimal overshoot. Discussion: The adaptive observer and dual-current compensation significantly enhance dynamic response and disturbance rejection in high-speed operation. The nonlinear regulator boosts stability while preserving fast response, offering a viable solution for high-performance drives. Conclusion: The proposed method enables high-speed, high-precision PMSM control, overcoming traditional drawbacks in overshoot, response speed, and anti-interference capability, and provides a reliable approach for stable high-performance motor operation.