Flux-Weakening Control of Interior Permanent Magnet Synchronous Motors with Extended DCLink Voltage Utilization and Improved Tracking Performance

This paper presents a novel flux-weakening control strategy for interior permanent magnet synchronous motors. The proposed method achieves the extended dc-link voltage utilization and improves the tracking performance. In the proposed flux regulator, the stator flux linkage reference is adjusted based on the modulation index, torque reference, and motor speed. The voltage trajectory is extended to the overmodulation region to increase the dc-link voltage utilization rate and the output torque. Moreover, a current predictive controller is implemented to improve the dynamic tracking performance. The proposed flux-weakening method is insensitive to parameters variation and shows fast dynamic performance. Simulations are carried out to validate the proposed method.