Permanent Magnet Synchronous Motor Direct Torque Control Model

Direct torque control (DTC) modeling for permanent magnet synchronous motors (PMSM) presents a sophisticated challenge in motor control engineering. This implementation utilizes MATLAB 6.5's Simulink environment, featuring a comprehensive block diagram approach with torque and flux hysteresis controllers that directly regulate motor torque without requiring PWM modulation.

The Simulink model incorporates key functional blocks including three-phase voltage source inverter modeling, Clarke/Park transformations for coordinate conversion, and flux/torque estimators using voltage and current measurements. The core algorithm implements bang-bang control through dual hysteresis comparators that maintain torque and stator flux within predefined bands, with switching table logic determining optimal inverter states.

Through this simulation environment, engineers can analyze torque response characteristics, flux trajectory patterns, and switching frequency behavior. The model demonstrates practical implementation of DTC principles including flux-weakening operation and dynamic performance under load variations. Simulation parameters allow adjustment of hysteresis band widths, sampling times, and motor specifications to optimize system performance.

This MATLAB/Simulink implementation serves as an educational and development platform for automotive propulsion systems, industrial drives, and renewable energy applications. The modular architecture enables easy integration of advanced features like speed observers, field-oriented control hybrids, and fault-tolerant operations while maintaining the simplicity inherent in direct torque control methodology.