DSP-controlled direct torque control of induction machines based on modulated hysteresis control

The purpose of this paper is to describe a new method for modulated hysteresis direct torque control algorithm for induction motor (IM) to minimize torque ripple and to obtain a constant switching frequency. The design methodology is based on space vector modulation of electrical machines with digital vector control. MATLAB simulations supported with experimental study under C++ are used. -The simulation and experimental results of this proposed algorithm show adequate dynamic to IM, however the research can be extended to include synchronous motor as well. The implementation of the proposed algorithm in microcontroller embedded systems is described. It requires no PI controller in the torque control loop. Results obtained from simulation and experiments confirmed the feasibility of the proposed strategy comparing to the conventional.