Four phase (8/6) SRM with DTC for minimization of torque ripple

Abstract

Fundamental drawback of SR (switched reluctance) motor is torque ripple which is caused because of the current switching in the phase windings and saliency. The torque ripple introduces acoustic noise and undesirable vibrations in SRM. In this paper, another solution is proposed, which can obtain direct torque control (DTC) with voltage states of minimum numbers. The converter power switches can be specifically controlled in view of the proposed space voltage vectors, and with the hysteresis-loop control of torque, the torque control can be accomplished. For SRM, the vectors with basic space voltage are transformed correspondingly to acknowledge DTC. To execute the DTC, the space voltage vectors are equivalently changed into space voltage vectors. The torque can be controlled by these developed equivalent space voltage vectors. DTC strategy has numerous points of interest, for example, simple algorithm, less torque ripple and instantaneous response to the torque command over conventional voltage control and current chopping mode control. The DTC algorithm described in this article is contrasted with ant lion optimization (ALO), non-dominating sorting search algorithm (NSGA-II) and combined moth flame optimization and genetic algorithm with recurrent neural network (CMFG-RNN) strategies.