A New Converter Based On DITC for improving Torque Ripple and Power Factor in SRM Drives

Abstract

This paper presents a new converter based on Direct Instantaneous Torque Control (DITC) method to improve torque ripple and power factor in switched reluctance motor (SRM). Due to simplicity and low cost, SRMs are good options in adjustable speed applications. However, reducing torque ripple in this kind of motors is challenging. So far, many methods, which can be placed in indirect and direct methods, have been proposed to reduce the torque ripple in SRM motors. In indirect method, torque is indirectly controlled by controlling the phase currents in which torque ripple is reduced by applying the appropriate current profiles. However, these profiles are pre-calculated for a specified operating point which occupy large space in the microcontroller unit. On the other hand, in direct Method, torque is directly controlled and there is no current control unit any more. To show the improvement of the torque ripple and power factor in the proposed converter, the simulation results are presented for an 8/6 SRM by using MATLAB/Simulink.