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

This paper conducts a detailed analysis of common issues in conventional direct torque control (DTC) systems for permanent magnet synchronous motors (PMSMs), including accurate flux linkage observation, stator resistance variations, improvements to voltage vector switching tables, and hysteresis controller enhancements. The study introduces space vector modulation (SVM) into conventional DTC to improve system performance and provides comprehensive analysis of sensorless speed estimation techniques, summarizing current research trends worldwide. The proposed solution implements a rotor flux vector-based speed estimation method using mathematical modeling and control algorithm optimizations, with simulation results demonstrating excellent dynamic and static characteristics.