Dynamic Flux Weakening-Based DPCC for Rapid Torque Rise of SPMSM Drives at Medium-to-High Speeds

The ideal two-sample deadbeat response can be achieved through deadbeat predictive current control (DPCC) in surface-mounted permanent magnet synchronous motor (SPMSM) drives, provided that sufficient voltage is available. However, voltage deficiency commonly occurs during abrupt torque changes at medium-to-high speeds, inevitably degrading dynamic performance. In this article, a dynamic flux weakening-based DPCC (DFW-DPCC) is proposed to enhance the dynamic performance of torque rise under voltage-limited conditions. First, a novel concept of the current increment limit circle is introduced, and the reasons why torque rise dynamic performance is limited at medium-to-high speeds, as well as the mechanism by which flux weakening can enhance the torque rise rate, are mathematically elucidated. Second, the torque rise time prediction algorithm (TRTP) is proposed, enabling accurate prediction of the time required for a torque rise process. Building on TRTP, the DFW-DPCC is designed to first increase the torque rise rate by flux weakening, followed by executing the torque rise operation at a higher rise rate. The dynamic performance of torque rise is optimized by determining an optimal flux-weakening current that minimizes the total time required for both flux weakening and torque rise. Experimental results validate the effectiveness and superiority of DFW-DPCC.