Direct Torque Control for Permanent Magnet Synchronous Motors

Direct Torque Control (DTC) for Permanent Magnet Synchronous Motors (PMSM) is a high-performance motor control strategy that eliminates complex coordinate transformations and Pulse Width Modulation (PWM) stages required in traditional vector control methods like Field-Oriented Control (FOC). The algorithm achieves rapid dynamic response by directly regulating torque and flux linkage through hysteresis comparators.

This program implements DTC for PMSM with experimentally verified reliability and practicality. The core DTC algorithm uses hysteresis comparators for real-time torque and flux regulation, optimizing motor operational states. This approach reduces computational complexity while enhancing system robustness through simplified voltage vector selection logic.

The program architecture comprises three key functional modules: Flux Observation: Estimates stator flux linkage through measured motor currents and voltages using integration methods, ensuring accurate tracking of reference flux values. Torque Calculation: Computes electromagnetic torque based on cross-product of flux and current vectors, with hysteresis control maintaining torque errors within predefined bands. Switching Table Selection: Determines optimal voltage vectors from pre-defined lookup tables according to flux and torque error signals, enabling rapid motor state adjustments through inverter switching patterns.

This implementation suits industrial servo systems, electric vehicles, and other applications requiring fast torque response, serving as a reference solution for both research and engineering implementations.