Addressing Key Challenges in Conventional Direct Torque Control Systems for Permanent Magnet Synchronous Motors

This paper provides a detailed analysis of key challenges in conventional direct torque control systems for permanent magnet synchronous motors, including issues such as accurate flux linkage observation, stator resistance variations, improvements to voltage vector switching tables, and enhancements to hysteresis controllers. The implementation involves advanced flux observers using mathematical models and adaptive algorithms to address parameter variations. To further enhance system performance, the study incorporates space vector modulation methodology into conventional direct torque control, involving optimized PWM generation techniques and voltage vector selection algorithms. Additionally, the paper presents a comprehensive analysis of sensorless speed estimation problems in PMSMs, summarizing current research hotspots worldwide. Based on this analysis, the study proposes a speed estimation method for PMSM direct torque control utilizing rotor flux vector fundamentals, implemented through coordinate transformation algorithms and model reference adaptive systems. Simulation results validate that the proposed solution delivers excellent performance in both dynamic and static operating characteristics, with implementation code featuring real-time parameter updates and robust control logic.