DSP Based Implementation of Sliding Mode Speed Controller for Direct Torque Controlled PMSM Drive

This paper deals with the DSP based implementation of a sliding mode (SM) speed controller for direct torque controlled (DTC) permanent magnet synchronous motor (PMSM) drive. The drive system consists of power circuit and control hardware. The former has insulated gate bipolar transistor (IGBT) based voltage source inverter (VSI) and gate driver circuit, while the latter has voltage and current sensors and their interfacing circuits. The rotor speed estimation from the sensed position signals, SM speed controller, torque, flux, and sector estimator and optimum voltage vector selection table for gating pulse generation of VSI are implemented in assembly language of DSP-ADMC401. The simulation model of the PMSM drive system is developed in MATLAB environment with Simulink and PSB toolboxes to analyze the performance of the proposed drive system. The simulated performance of SM speed controlled PMSM drive is validated with the test results for starting, speed reversal, load perturbation and steady-state operating conditions.