Decoupled Discrete-Time Current Control for SPMSM With Enhanced Resonant Controller in Two-Degree-of-Freedom Structure

When suppressing both aperiodic and periodic disturbances in surface-mounted permanent magnet synchronous motor (SPMSM), the traditional method based on a two-degree-of-freedom (TDOF) parallel quasi-resonant controller suffers from inherent coupling issues. These include coupling between tracking and anti-disturbance performance, as well as coupling between the aperiodic and periodic disturbance suppression loops. To address these issues, a novel TDOF structure is proposed based on the SPMSM discrete-time complex vector model, incorporating an enhanced resonant controller. This design effectively eliminates undesired peaks caused by coupling without requiring complex parameter tuning. Theoretical analysis shows that the proposed method achieves improved stability, enhanced aperiodic and periodic disturbance suppression performance, and greater robustness to parameter mismatches. Experimental results further validate the effectiveness of the approach in all these aspects.