Direct torque control of 4 phase 8/6 switched reluctance motor drive for constant torque load

Abstract. The Switched Reluctance Motor (SRM) Drives have attracted the attention of many researchers in the recent past because of advantages like simple mechanical structure, adaptability to harsh environments like coal mining etc. But it has one main disadvantage of high torque ripple due to its double saliency structure. The Direct Torque Control (DTC) technique can minimize the torque ripple by regulating torque within specified hysteresis band. This paper presents the Direct Torque Control of 4 phase 8/6 Switched Reluctance Motor fed through an asymmetrical converter. A four phase asymmetrical converter has total 81 Space voltage vectors. So like the conventional DTC applied to ac motor, 8 Space voltage vectors are sufficient to apply DTC technique to SRM. The Direct Torque Control of SRM is simulated in MATLAB/ SIMULINK for constant torque load. The performance of the drive mainly in terms of torque ripple is analyzed with new set of space vectors.