MATLAB Simulation Model for Direct Torque Control of Three-Phase Induction Motors

This article presents a MATLAB simulation model for direct torque control of three-phase induction motors, designed to help users better understand the control methodology. The model construction process will be explained from fundamentals, covering necessary implementation steps and tools. Key components include Clarke/Park transformations for coordinate conversion, flux and torque estimators using voltage and current measurements, and hysteresis band controllers for switching decision logic. The demonstration will cover simulation procedures with practical examples showing dynamic response under different load conditions. Throughout the learning process, I will share practical implementation techniques such as proper sampling time selection, parameter tuning methods for hysteresis controllers, and solutions for common simulation challenges like numerical instability. The model implements core DTC features including: instantaneous torque calculation using cross-product of stator flux and current, flux magnitude regulation through voltage vector selection, and six-sector division for optimal switching strategy. Simulation results will showcase torque ripple characteristics and flux trajectory patterns. This resource aims to provide valuable insights into motor control implementation. For any technical questions or suggestions regarding model structure, algorithm optimization, or simulation parameters, please feel free to contact me for discussion.